Interesting article on the new VQ
09-14-2006, 02:43 PM
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Interesting article on the new VQ
linked from www.autoblog.com
http://www.nissanperformancemag.com/september06/vq35hr/
Guys luck out and see an 07 G35 prototype in a junkyard near Nissans old HQ in California. Lots of speculation in the article, but could be some very good and useful information for the modding community.
http://www.nissanperformancemag.com/september06/vq35hr/
Guys luck out and see an 07 G35 prototype in a junkyard near Nissans old HQ in California. Lots of speculation in the article, but could be some very good and useful information for the modding community.
Originally Posted by Nissan Performance Mag
VQ35HR
An NPM Scoop, We find the new G35 and get a sneak look at the VQ35HR motor!
Text and Photos by John Smalberys
Some anonymous NPM staff members had traveled to Carson, Ca to enjoy some local Hawaiian food when they spotted a damaged prototype 2007 G35 in a lot at an auto salvage yard. Apparently this damaged engineering development car was shoved out the door to be destroyed by shredding in haste as Nissan wraps up its operations in the Southern California area and the normal draconian secrecy procedures for the disposal of secret cars were let slip. Oh well, Nissan's loss is our reader gains. Our staff members hastily brought back some photos of the car before being run off of the facilities property by security guards. We have subjected the photos to our professional analyses to give you a look of what's to come with the new G35 and the new 2008 Z, which will also shares the same second generation FM platform.
While going to lunch at Lahina's in Carson we spotted this through a hole in the fence in a lot not far from Nissan's headquarters or ex headquarters. We snapped these shots in a few seconds before security guards came and threw us out. The next day the car was gone.
We have also gleaned some information from Nissans official press release, and pictures from Nissan Japans web sights to give you an overall look into the new engine the VQ35HR. Other credit must go to NICO's web site VQ35HR.com and 350z-tech.com for doing a good job at compiling existing information on the engine. We have taken our own spy info plus applied some engineering analysis to information gathered from these enthusiast sites, ex Nissan employees and OEM suppliers to draft our own conclusions about the motor.
Overall the new G is an evolutionary development of the old one. The basic design remains very similar but numerous notable and large changes have been made to refine what is already a very good car.
Chassis
We noted several things from our quick look at the chassis. It seams like much more attention is being paid to chassis ridgity. Increasing the chassis stiffness does several things. Stiffer chassis structures have a higher natural frequency, the higher the natural frequency, the less likely that the chassis can be excited into vibrational modes by the frequencies that are most likely to be encountered by the car in normal use. In normal English this means less squeaks and rattles.
The second reason why additional ridgity is good is that chassis flex can be thought of as uncontrolled suspension movement, unconstrained by dampers. The flex has a loose or a bouncy feeling which can contribute to a rougher ride and poorer handling. When the chassis is made stiffer, the suspension can also be stiffened to better control body motion in the turns with no loss in ride comfort or suspension compliance which helps keep the tires on the road. This is because the stiff chassis is allowing the suspension to take up shock loads instead of flexing.
We noted in our quick look that the unibody has a lot more spot welds and the spacing between spot welds is a lot closer than typical, much akin to the increase in welds seen in other high performance cars such as the Subaru WRX and the Mitsubishi EVO. The suspension sits on massive formed aluminum closed form perimeter subframes that wrap around the entire front and rear of the chassis and are solidly bolted to the chassis in many places. This gives the chassis maximum stiffness. This is a far cry from Nissans older designs that isolated the suspension subframes on gushy rubber bushings.
The chassis ring module as well as the A and B pillars have larger cross sectional areas further contributing to stiffness. Although we could not confirm this, we suspect that the new chassis may make extensive use of structural adhesives in the seams of the unibody as well.
As this chassis is probably a preview of what is to come in the 2008 Z, things look good in the performance department. Our sources say that the next generation Z will use share a lot of components with the G35, but have more extensive use of aluminum in the chassis structure. The new Z will be smaller, lighter, more powerful and perhaps even less expensive than the current one. It will be less of a GT car and more of a simple, spare drivers sports car.
Brakes
Those are big brakes, the rotor is probably 13" in diameter.
The G35 prototype had really large brakes. Although we did not measure them, the rotors appear to be around 12.5-13" in diameter. These are the biggest brakes we have ever seen on a Nissan. The calipers are big single piston floating type. We presume that the next generation 2008 Z will also have these bigger brakes. We wonder if Nissan will continue to offer a Brembo option with these big brakes.
That trick ultra light spare is made by Enkei according to the casting mark we saw on it. Maybe we can run them on the front of a drag car.
Suspension
The front suspension is a multilink with forged aluminum links but with a more simple geometry than the currently complex articulated lower control arm. We feel that this is a step in the right direction as a straightforward good geometry is probably better for less bump steer than the crazy variable camber curve, constant caster monster that is in the current Z. The rear suspension appears to be close to the current rear multilink with forged aluminum main links and steel toe rods. We could not look too closely as the guards noticed us at about this point.
Interior
The interior is similar to the M35/45 and is more luxurious than the old G35.
Although we didn't have time to look to closely, the interior seems to take a lot of its DNA from the M35/45, especially the annoying BMW I-Drive like main control for most functions. Not all changes are for the better. On a positive note, the interior appointments seemed at a glance to be more sumptuous than the current G.
Engine
And now the part you have all been waiting for, an engineers look inside the much anticipated VQ35HR, the next generation of VQ engines from Nissan. According to Nissans PR hacks the HR moniker stands for "High Rev" and "High Response". Although this sounds somewhat hokey, it is a lot less dumb sounding than the current top of the line "Rev Up" spec engine. Although some of these specs and rumors have been floating around on various web sites for awhile now, we will add our own analysis to things and explain why certain things are being done and how they work.
Here is what is left of the motor. The dual intake plastic manifold is missing.
There are some differences seen in the specs of the new motor vs the old right off the bat. Nissan claims an increase of 10% in fuel economy and emissions reduction. The compression has been increased from 10.3 to 10.6:1. The power has gone up to 315 hp ps or around 306 hp SAE. The engines redline has been increased to 7500 rpm.
It seems like Nissan is up to something here as this engine is much more beefy inside than previously. In our opinion Nissan is getting ready to subject this engine to turbo boost for the long awaited R35 Skyline GT-R. Here is why we think this.
The stout bed plate block holds' the crank in this stout cage. This should take over 1000 hp no sweat.
The block is much stronger. It uses a bed plate type lower end, much like that what is seen in engines designed specifically for racing like the Cosworth powerplant used in Champ Car racing and others used in F1. A bed plate block is one where the block is split at the crankshaft into an upper and lower portion. The crank is solidly supported by a huge girdle of aluminum solidly bolted to the block at many points instead of individual main caps that most motors have. There is little opportunity for block flex and bearing eating, crank breaking distortion here. This beefy lower end was first seen on the heavy duty VQ40DE motors used in the Pathfinder and Frontier trucks. The crank is beefed up as well featuring the larger rod and main bearing journal diameters of the heavy duty VQ40DE truck engine.. Can you see the future potential for GT-R turbo boost here?
Look at the beef behind the crank. Its way more stout than the VG30 or the VQ35DE. Plenty of journal overlap and bearing area should allow this pup to handle 1000 hp of boost.
The block itself has a taller deck height than the older VQ35DE. This was done to accommodate longer connecting rods. Longer connecting rods improve volumetric efficiency at high rpm by giving more dwell time at TDC. This gives the cylinders more time to fill on the intake stroke, improving high RPM power.
This looks like an old school VG or SR rod. Nissan beef is back. The rod has lots of material and is strong. It should probably be able to take 600 hp stock. See the thick parting line down the middle of the beam? This indicates that its forged or PM, not cast like NICO says.
Longer rods also improve mechanical and combustion efficiency. This is because the combustion event has a longer dwell time to initially push harder on the piston as it travels downward down the piston bore and the connecting rod has less angularity so it will not cause the piston to **** in the bore and dig as hard into the cylinder walls. This puts less stress on the piston and connecting rod as well as reduces friction.
The pistons have some interesting features, mainly an asymmetric shape with a larger skirt area on the thrust side for good support and a cut down skirt on the non thrust side for less friction and less weight. The rods themselves have been beefed up with more meat around the big end and a wider beam. VQ rods have been known to be problematic on higher revving and boosted motors
The pistons most innovative feature is the wide skirt on the thrust side to support the thrust loads better and the narrow skirt on the opposite side for less weight and friction. What a good idea! Soon the aftermarket will copy this.
and this appears to be a good thing, returning to Nissans prior heritage of having near bulletproof rods. The NICO website has reported the rods to be a high pressure casting be we think that is not correct, in photos of the rods the thick parting line of a forging die or a PM (powdered metal forging) die are clearly seen. A cast rod would be inferior to a forged or PM part so we think that NICO is mistaken. The piston ring lands have been hard anodized for better wear and the skirts feature a low friction polymer coating. The dome configuration appears to be little changed form previous VQ variants.
The cylinder heads seem to be an evolution of the current VQ head rather than a revolution like the rest of the engine. The heads have a variable cam timing VTC device on both the intake and exhaust cams with the intake being infinitely variable hydraulic and the exhaust being a two step electromagnetic clutch. This configuration appears to be nearly identical to that found in the current Rev Up spec engine. VTC can control the cams advance, retard and lobe centers but not the actual lift and duration like Honda's VTEC system can. The intake port has a straighter more line of sight direction presumably for better tumble and mixture consistency in the cylinders as well as better flow.
A JDM Nissan diagram showing how the longer rod and the asymmetrical piston skirts work.
Unlike the VQ35DE, which had an open quenchless combustion chamber, the VQ35HR has a pentroof chamber with quench pads on either side of the intake and exhaust valves, much like the older VQ30DE had. This is presumably where the increase in compression ratio came from and should also result in better combustion and less detonation due to higher mixture turbulence and more homogeneousness of the fuel air mixture as the piston hits TDC on the compression stroke. There are rumors that the HR has larger valves but we cannot confirm this.
A big improvement over the VQ35DE, the VQ35HR has a combustion chamber that has two quench pads per cylinder for improved combustion and detonation resistance.
The HR has different camshafts and valvesprings to support the higher revs
The tops of the cam followers are coated with a Diamond Like Coating for maximum reduction in friction.
and the cam followers use a DLC coating which Nissan is quite proud of. Nissan claims that this is the first use of DLC in a production engine. DLC is short for Diamond like coating. DLC coatings have been used for some time in NASCAR and drag racing for cam followers and piston pins to my knowledge and probably other high end motorsports applications for sure. DLC is a thin layer of diamond like carbon which is the hardest and slipperiest stuff known. Nissan credits much of the HR's friction reduction to this coating. The NICO web site has reported that DLC is used in the pistons, this is simply not true. The piston coating is an organic dry lube much like Teflon.
Looking at the front of the engine is interesting. The front cover no longer has an access port for the water pump. This means that changing a water pump is going to take some work. I hope Nissan improved the water pump while they were in there! The rear of the block has the same bellhousing bolt pattern as the VK45 and 56 as well as the VQ40DE, some interesting info for all of you swapaholics out there.
The intake port has a new line of sight layout for better flow and tumble into the cylinder on the intake stroke for better mixing of the fuel air mixture. (photo courtesy of JWT)
The peripherals of the engine have changes for the better as well. The exhaust manifolds are now close to equal length tubular headers! There is probably not much room for improvement by the aftermarket here. The intake manifold is now plastic with a larger plenum and shorter, bigger diameter runners. The plastic is very smooth in the ports which should result in excellent flow. The plastic does not conduct heat well which should mean a cooler intake charge. The most interesting thing is that the plenum now sports dual throttle bodies, dual intake tubes, dual MAF's and dual ram cold air airboxes. Again the aftermarket is going to be hard pressed to find improvement here.
The exhaust manifold is a close to equal length header. It looks very close to the DC header for the 350Z.
The exhaust is a true dual system and sports an X-pipe in the middle. The most powerful aftermarket 350Z exhausts by Stillen and B&B have found that an X pipe really helps improve low end torque with no sacrifices anywhere else. Nissan claims that the new engine sounds good due to the intake and exhaust systems having the same length but we feel that this is due to the X-pipe. The exhaust also features close coupled cats with low thermal mass for quick lite off and a big reduction in emissions. This usually means that the cat monolith is ceramic which has been the cause for a lot of grief with the QR25DE 4 cylinder. The ceramic is brittle and prone to fracture. The engine's VTC sometimes causes a vacuum in the exhaust manifold because it uses cam timing induced exhaust reversion in lieu of an EGR valve. If the cat fails, this can result in the abrasive ceramic getting sucked into the engine. Better hope Nissan has solved some of these problems.
The all plastic intake manifolds most noticeable feature is dual throttle bodies and intake tubes.
The injectors are a multi hole, 50 micron droplet high atomization design for good burn. (photo courtesy of JWT)
The engine also features improved faster warming wide band O2 sensors for better sensing of the A/F ratio. We figure that these are a refinement of the current Bosch technology with a hotter heater, like a Horiba reference sensor. The injectors are multi hole 50 micron spray type for super good atomization. A fine wire iridium center electrode on the plugs helps them get free of fouling from a cold start faster. The cats, O2 sensors, injectors, iridium plugs and dual VTC help the HR get the nearly impossible for a high performance engine, SULEV rating.
The HR engine will be the workhorse engine for the Z in the near future but even better stuff may be coming later. It is a strong, nearly confirmed rumor that the engine used in the upcoming super secret Skyline GT-R will use a twin turbo 3.7 liter version of the HR motor topped with some secret cylinder heads developed by none other than Cosworth. The new Cosworth heads will also feature Nissans VVL technology where lift, duration, lobe centers and advance can be controlled by the engines ECU, much like Honda's I-VTEC system. The turbos will be smog friendly using Cosworth technology that bypasses the turbos during cold start.
From this angle you can see that the motor did have dual intakes at one time.
The rumor mill also states that a 3.7 liter version of HR will be coming for an enthusiast package Z and a very limited production high hp version of the 3.7 with high compression and Cosworth heads, naturally aspirated is on line for the track model. Interchangeability with the VQ40 means that other interesting combos can be made by the tuners. We predict that it will be fairly easy to get up to 4.5 liters from this platform.
The VQ35DE is dead, long live the VQ35HR.
An NPM Scoop, We find the new G35 and get a sneak look at the VQ35HR motor!
Text and Photos by John Smalberys
Some anonymous NPM staff members had traveled to Carson, Ca to enjoy some local Hawaiian food when they spotted a damaged prototype 2007 G35 in a lot at an auto salvage yard. Apparently this damaged engineering development car was shoved out the door to be destroyed by shredding in haste as Nissan wraps up its operations in the Southern California area and the normal draconian secrecy procedures for the disposal of secret cars were let slip. Oh well, Nissan's loss is our reader gains. Our staff members hastily brought back some photos of the car before being run off of the facilities property by security guards. We have subjected the photos to our professional analyses to give you a look of what's to come with the new G35 and the new 2008 Z, which will also shares the same second generation FM platform.
While going to lunch at Lahina's in Carson we spotted this through a hole in the fence in a lot not far from Nissan's headquarters or ex headquarters. We snapped these shots in a few seconds before security guards came and threw us out. The next day the car was gone.
We have also gleaned some information from Nissans official press release, and pictures from Nissan Japans web sights to give you an overall look into the new engine the VQ35HR. Other credit must go to NICO's web site VQ35HR.com and 350z-tech.com for doing a good job at compiling existing information on the engine. We have taken our own spy info plus applied some engineering analysis to information gathered from these enthusiast sites, ex Nissan employees and OEM suppliers to draft our own conclusions about the motor.
Overall the new G is an evolutionary development of the old one. The basic design remains very similar but numerous notable and large changes have been made to refine what is already a very good car.
Chassis
We noted several things from our quick look at the chassis. It seams like much more attention is being paid to chassis ridgity. Increasing the chassis stiffness does several things. Stiffer chassis structures have a higher natural frequency, the higher the natural frequency, the less likely that the chassis can be excited into vibrational modes by the frequencies that are most likely to be encountered by the car in normal use. In normal English this means less squeaks and rattles.
The second reason why additional ridgity is good is that chassis flex can be thought of as uncontrolled suspension movement, unconstrained by dampers. The flex has a loose or a bouncy feeling which can contribute to a rougher ride and poorer handling. When the chassis is made stiffer, the suspension can also be stiffened to better control body motion in the turns with no loss in ride comfort or suspension compliance which helps keep the tires on the road. This is because the stiff chassis is allowing the suspension to take up shock loads instead of flexing.
We noted in our quick look that the unibody has a lot more spot welds and the spacing between spot welds is a lot closer than typical, much akin to the increase in welds seen in other high performance cars such as the Subaru WRX and the Mitsubishi EVO. The suspension sits on massive formed aluminum closed form perimeter subframes that wrap around the entire front and rear of the chassis and are solidly bolted to the chassis in many places. This gives the chassis maximum stiffness. This is a far cry from Nissans older designs that isolated the suspension subframes on gushy rubber bushings.
The chassis ring module as well as the A and B pillars have larger cross sectional areas further contributing to stiffness. Although we could not confirm this, we suspect that the new chassis may make extensive use of structural adhesives in the seams of the unibody as well.
As this chassis is probably a preview of what is to come in the 2008 Z, things look good in the performance department. Our sources say that the next generation Z will use share a lot of components with the G35, but have more extensive use of aluminum in the chassis structure. The new Z will be smaller, lighter, more powerful and perhaps even less expensive than the current one. It will be less of a GT car and more of a simple, spare drivers sports car.
Brakes
Those are big brakes, the rotor is probably 13" in diameter.
The G35 prototype had really large brakes. Although we did not measure them, the rotors appear to be around 12.5-13" in diameter. These are the biggest brakes we have ever seen on a Nissan. The calipers are big single piston floating type. We presume that the next generation 2008 Z will also have these bigger brakes. We wonder if Nissan will continue to offer a Brembo option with these big brakes.
That trick ultra light spare is made by Enkei according to the casting mark we saw on it. Maybe we can run them on the front of a drag car.
Suspension
The front suspension is a multilink with forged aluminum links but with a more simple geometry than the currently complex articulated lower control arm. We feel that this is a step in the right direction as a straightforward good geometry is probably better for less bump steer than the crazy variable camber curve, constant caster monster that is in the current Z. The rear suspension appears to be close to the current rear multilink with forged aluminum main links and steel toe rods. We could not look too closely as the guards noticed us at about this point.
Interior
The interior is similar to the M35/45 and is more luxurious than the old G35.
Although we didn't have time to look to closely, the interior seems to take a lot of its DNA from the M35/45, especially the annoying BMW I-Drive like main control for most functions. Not all changes are for the better. On a positive note, the interior appointments seemed at a glance to be more sumptuous than the current G.
Engine
And now the part you have all been waiting for, an engineers look inside the much anticipated VQ35HR, the next generation of VQ engines from Nissan. According to Nissans PR hacks the HR moniker stands for "High Rev" and "High Response". Although this sounds somewhat hokey, it is a lot less dumb sounding than the current top of the line "Rev Up" spec engine. Although some of these specs and rumors have been floating around on various web sites for awhile now, we will add our own analysis to things and explain why certain things are being done and how they work.
Here is what is left of the motor. The dual intake plastic manifold is missing.
There are some differences seen in the specs of the new motor vs the old right off the bat. Nissan claims an increase of 10% in fuel economy and emissions reduction. The compression has been increased from 10.3 to 10.6:1. The power has gone up to 315 hp ps or around 306 hp SAE. The engines redline has been increased to 7500 rpm.
It seems like Nissan is up to something here as this engine is much more beefy inside than previously. In our opinion Nissan is getting ready to subject this engine to turbo boost for the long awaited R35 Skyline GT-R. Here is why we think this.
The stout bed plate block holds' the crank in this stout cage. This should take over 1000 hp no sweat.
The block is much stronger. It uses a bed plate type lower end, much like that what is seen in engines designed specifically for racing like the Cosworth powerplant used in Champ Car racing and others used in F1. A bed plate block is one where the block is split at the crankshaft into an upper and lower portion. The crank is solidly supported by a huge girdle of aluminum solidly bolted to the block at many points instead of individual main caps that most motors have. There is little opportunity for block flex and bearing eating, crank breaking distortion here. This beefy lower end was first seen on the heavy duty VQ40DE motors used in the Pathfinder and Frontier trucks. The crank is beefed up as well featuring the larger rod and main bearing journal diameters of the heavy duty VQ40DE truck engine.. Can you see the future potential for GT-R turbo boost here?
Look at the beef behind the crank. Its way more stout than the VG30 or the VQ35DE. Plenty of journal overlap and bearing area should allow this pup to handle 1000 hp of boost.
The block itself has a taller deck height than the older VQ35DE. This was done to accommodate longer connecting rods. Longer connecting rods improve volumetric efficiency at high rpm by giving more dwell time at TDC. This gives the cylinders more time to fill on the intake stroke, improving high RPM power.
This looks like an old school VG or SR rod. Nissan beef is back. The rod has lots of material and is strong. It should probably be able to take 600 hp stock. See the thick parting line down the middle of the beam? This indicates that its forged or PM, not cast like NICO says.
Longer rods also improve mechanical and combustion efficiency. This is because the combustion event has a longer dwell time to initially push harder on the piston as it travels downward down the piston bore and the connecting rod has less angularity so it will not cause the piston to **** in the bore and dig as hard into the cylinder walls. This puts less stress on the piston and connecting rod as well as reduces friction.
The pistons have some interesting features, mainly an asymmetric shape with a larger skirt area on the thrust side for good support and a cut down skirt on the non thrust side for less friction and less weight. The rods themselves have been beefed up with more meat around the big end and a wider beam. VQ rods have been known to be problematic on higher revving and boosted motors
The pistons most innovative feature is the wide skirt on the thrust side to support the thrust loads better and the narrow skirt on the opposite side for less weight and friction. What a good idea! Soon the aftermarket will copy this.
and this appears to be a good thing, returning to Nissans prior heritage of having near bulletproof rods. The NICO website has reported the rods to be a high pressure casting be we think that is not correct, in photos of the rods the thick parting line of a forging die or a PM (powdered metal forging) die are clearly seen. A cast rod would be inferior to a forged or PM part so we think that NICO is mistaken. The piston ring lands have been hard anodized for better wear and the skirts feature a low friction polymer coating. The dome configuration appears to be little changed form previous VQ variants.
The cylinder heads seem to be an evolution of the current VQ head rather than a revolution like the rest of the engine. The heads have a variable cam timing VTC device on both the intake and exhaust cams with the intake being infinitely variable hydraulic and the exhaust being a two step electromagnetic clutch. This configuration appears to be nearly identical to that found in the current Rev Up spec engine. VTC can control the cams advance, retard and lobe centers but not the actual lift and duration like Honda's VTEC system can. The intake port has a straighter more line of sight direction presumably for better tumble and mixture consistency in the cylinders as well as better flow.
A JDM Nissan diagram showing how the longer rod and the asymmetrical piston skirts work.
Unlike the VQ35DE, which had an open quenchless combustion chamber, the VQ35HR has a pentroof chamber with quench pads on either side of the intake and exhaust valves, much like the older VQ30DE had. This is presumably where the increase in compression ratio came from and should also result in better combustion and less detonation due to higher mixture turbulence and more homogeneousness of the fuel air mixture as the piston hits TDC on the compression stroke. There are rumors that the HR has larger valves but we cannot confirm this.
A big improvement over the VQ35DE, the VQ35HR has a combustion chamber that has two quench pads per cylinder for improved combustion and detonation resistance.
The HR has different camshafts and valvesprings to support the higher revs
The tops of the cam followers are coated with a Diamond Like Coating for maximum reduction in friction.
and the cam followers use a DLC coating which Nissan is quite proud of. Nissan claims that this is the first use of DLC in a production engine. DLC is short for Diamond like coating. DLC coatings have been used for some time in NASCAR and drag racing for cam followers and piston pins to my knowledge and probably other high end motorsports applications for sure. DLC is a thin layer of diamond like carbon which is the hardest and slipperiest stuff known. Nissan credits much of the HR's friction reduction to this coating. The NICO web site has reported that DLC is used in the pistons, this is simply not true. The piston coating is an organic dry lube much like Teflon.
Looking at the front of the engine is interesting. The front cover no longer has an access port for the water pump. This means that changing a water pump is going to take some work. I hope Nissan improved the water pump while they were in there! The rear of the block has the same bellhousing bolt pattern as the VK45 and 56 as well as the VQ40DE, some interesting info for all of you swapaholics out there.
The intake port has a new line of sight layout for better flow and tumble into the cylinder on the intake stroke for better mixing of the fuel air mixture. (photo courtesy of JWT)
The peripherals of the engine have changes for the better as well. The exhaust manifolds are now close to equal length tubular headers! There is probably not much room for improvement by the aftermarket here. The intake manifold is now plastic with a larger plenum and shorter, bigger diameter runners. The plastic is very smooth in the ports which should result in excellent flow. The plastic does not conduct heat well which should mean a cooler intake charge. The most interesting thing is that the plenum now sports dual throttle bodies, dual intake tubes, dual MAF's and dual ram cold air airboxes. Again the aftermarket is going to be hard pressed to find improvement here.
The exhaust manifold is a close to equal length header. It looks very close to the DC header for the 350Z.
The exhaust is a true dual system and sports an X-pipe in the middle. The most powerful aftermarket 350Z exhausts by Stillen and B&B have found that an X pipe really helps improve low end torque with no sacrifices anywhere else. Nissan claims that the new engine sounds good due to the intake and exhaust systems having the same length but we feel that this is due to the X-pipe. The exhaust also features close coupled cats with low thermal mass for quick lite off and a big reduction in emissions. This usually means that the cat monolith is ceramic which has been the cause for a lot of grief with the QR25DE 4 cylinder. The ceramic is brittle and prone to fracture. The engine's VTC sometimes causes a vacuum in the exhaust manifold because it uses cam timing induced exhaust reversion in lieu of an EGR valve. If the cat fails, this can result in the abrasive ceramic getting sucked into the engine. Better hope Nissan has solved some of these problems.
The all plastic intake manifolds most noticeable feature is dual throttle bodies and intake tubes.
The injectors are a multi hole, 50 micron droplet high atomization design for good burn. (photo courtesy of JWT)
The engine also features improved faster warming wide band O2 sensors for better sensing of the A/F ratio. We figure that these are a refinement of the current Bosch technology with a hotter heater, like a Horiba reference sensor. The injectors are multi hole 50 micron spray type for super good atomization. A fine wire iridium center electrode on the plugs helps them get free of fouling from a cold start faster. The cats, O2 sensors, injectors, iridium plugs and dual VTC help the HR get the nearly impossible for a high performance engine, SULEV rating.
The HR engine will be the workhorse engine for the Z in the near future but even better stuff may be coming later. It is a strong, nearly confirmed rumor that the engine used in the upcoming super secret Skyline GT-R will use a twin turbo 3.7 liter version of the HR motor topped with some secret cylinder heads developed by none other than Cosworth. The new Cosworth heads will also feature Nissans VVL technology where lift, duration, lobe centers and advance can be controlled by the engines ECU, much like Honda's I-VTEC system. The turbos will be smog friendly using Cosworth technology that bypasses the turbos during cold start.
From this angle you can see that the motor did have dual intakes at one time.
The rumor mill also states that a 3.7 liter version of HR will be coming for an enthusiast package Z and a very limited production high hp version of the 3.7 with high compression and Cosworth heads, naturally aspirated is on line for the track model. Interchangeability with the VQ40 means that other interesting combos can be made by the tuners. We predict that it will be fairly easy to get up to 4.5 liters from this platform.
The VQ35DE is dead, long live the VQ35HR.
09-14-2006, 07:35 PM
#6
Originally Posted by Metal Maxima
Cliffs???????
KCMC582, couldn't you at least highlight the important stuff? I can guarantee that you will get much more replies if we didn't have to read the whole thing to get to the point.
09-14-2006, 11:19 PM
#7
Supporting Maxima.org Member
Join Date: Apr 2004
Posts: 1,307
Originally Posted by Metal Maxima
Cliffs???????
- The new VQ is beefier all around (to support factory boost and larger bore in the future?) with a longer stroke and higher compression and redline.
- Flow is better in and out via larger, less restrictive dual intakes, dual throttle bodies, dual MAFs, etc.
- Exhaust is also dual equal-length headers with X-pipe in the middle.
- Variable timing (but not lift, except maybe on the GT-R) on both intake and exhaust.
- Other misc. stuff like diamond-like coated cam followers, pentroof chamber, improved piston skirt and injectors, etc. Basically to make more power more with less gas/emissions
The rest of the article talks about the G35
- The chassis is stiffer with more/closer spot welding and thicker pillars and beefier aluminum suspension subframes.
- Big brakes
- Light weight Enkei spare wheel
- Revised aluminum multi-link suspension front and back
- More "sumptuous" (their word, not mine) M35/45 like interior with BMW-esque I-Drive
What made the article so long was because it looked like it was written for non-enthusiasts, which confuses me because it was posted by enthusiasts on a site for enthusiasts.
For example, the writers spent half the time explaining why a stiffer chassis and stronger engine is good. Duh! Just shut up and give us the goods. 
The most disappointing part was that there wasn't any new information per se - just confirmations of what we already knew. 
09-15-2006, 01:37 PM
#9
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Originally Posted by DrKlop
KCMC582, couldn't you at least highlight the important stuff? I can guarantee that you will get much more replies if we didn't have to read the whole thing to get to the point.
Most of that is lost upon me and i really dont know as much as other people who are reading the article. people like BigEL are clearly more qualified to give cliffs on this.
09-16-2006, 06:35 PM
#11
I thought it was funny that they said that 12.5-13" brakes were the biggest they've seen on a nissan. They obviously haven't noticed that the 6th gen brakes are 12.6" diameter....
In fact, the brakes looked just like my 6th gen brake system.
In fact, the brakes looked just like my 6th gen brake system.
09-16-2006, 08:06 PM
#12
Originally Posted by GBAUER
I thought it was funny that they said that 12.5-13" brakes were the biggest they've seen on a nissan. They obviously haven't noticed that the 6th gen brakes are 12.6" diameter....
In fact, the brakes looked just like my 6th gen brake system.
In fact, the brakes looked just like my 6th gen brake system.
09-16-2006, 08:22 PM
#13
Originally Posted by Zack342
but its not its better.
09-16-2006, 09:45 PM
#14
good read. nice find. keep in mind that some was conjecture. I really hope they bump the coupe to 3.7 and give it the cosworth heads...at least on a performance version. honestly I am most impressed that they managed sulev with this engine!
09-17-2006, 04:45 AM
#15
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Posts: 3,883
Originally Posted by GBAUER
Uh, how? They're probably the same diameter and both single piston. In fact, they probably use the same caliper. I'll bet the entire set-up uses the same part numbers by the looks of it. How is it better? Besides, how would either of us know since this isn't even on the market?
09-17-2006, 06:08 AM
#17
Originally Posted by Frank Fontaine
It was my understanding that G35's, and I don't know all the designations, had two-piston calipers on the fronts. I could be wrong. But to use the same parts would be a mistake imho. That's like using a Sentra door handle in a Maxima and just making one look like fake chrome, oh wait, they did do that!
Reading>joo.
09-18-2006, 09:09 PM
#18
Reading Car and Driver's new issue, they really seem to like the new G35 from the preview they had.
One thing I did notice though in the pictures of their article. The brakes are no where near as big as the pictures the link of above has.
One thing I did notice though in the pictures of their article. The brakes are no where near as big as the pictures the link of above has.
09-18-2006, 10:30 PM
#19
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Originally Posted by GBAUER
Uh, how? They're probably the same diameter and both single piston. In fact, they probably use the same caliper. I'll bet the entire set-up uses the same part numbers by the looks of it. How is it better? Besides, how would either of us know since this isn't even on the market?
09-19-2006, 04:20 AM
#20
Originally Posted by Frank Fontaine
It was my understanding that G35's, and I don't know all the designations, had two-piston calipers on the fronts. I could be wrong. But to use the same parts would be a mistake imho. That's like using a Sentra door handle in a Maxima and just making one look like fake chrome, oh wait, they did do that!
I thought all g35's had the Brembo 4 piston front, 2 piston rear brakes set-up? I thought it was optional on the 350z?
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