Building a custom VQ35DE intake manifold
03-06-2006 | 05:14 PM
#42
Thread Starter
Senior Member
Joined: Jan 2004
Posts: 369
Update:
Chucked the steel long tube manifold idea and took the advice of many on here and went w/ a short runner large(ish) plenum design, still working out many details but here's a couple teaser shots.
enjoy,
allen
Chucked the steel long tube manifold idea and took the advice of many on here and went w/ a short runner large(ish) plenum design, still working out many details but here's a couple teaser shots.
enjoy,
allen
03-07-2006 | 04:39 AM
#45
Originally Posted by allen22
Update:
Chucked the steel long tube manifold idea and took the advice of many on here and went w/ a short runner large(ish) plenum design, still working out many details but here's a couple teaser shots.
enjoy,
allen
Chucked the steel long tube manifold idea and took the advice of many on here and went w/ a short runner large(ish) plenum design, still working out many details but here's a couple teaser shots.
enjoy,
allen
Looks good so far, what tool or machine are you using to make the bends in the sheet metal?
03-07-2006 | 05:57 AM
#46
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Senior Member
Joined: Jan 2004
Posts: 369
Originally Posted by JClaw
lol
Allen, does the VQ35 timing chain clear the stock 240 hood? Will it clear with your custom plenum?
Allen, does the VQ35 timing chain clear the stock 240 hood? Will it clear with your custom plenum?
I'm making the intake to clear the hood, definately a must there.
allen
03-07-2006 | 06:00 AM
#47
Thread Starter
Senior Member
Joined: Jan 2004
Posts: 369
Originally Posted by chris'smax
Looks good so far, what tool or machine are you using to make the bends in the sheet metal?
allen
03-07-2006 | 07:03 AM
#48
Senior Member
Joined: Nov 2005
Posts: 165
i guess you can get an already made plenum.
http://www.rossmachineracing.com/uni_intakeparts.html
http://www.rossmachineracing.com/uni_intakeparts.html
03-07-2006 | 11:38 AM
#50
Senior Member
Joined: Sep 2002
Posts: 1,383
Originally Posted by SuperStasiu
I know what they do its just that a direct boost fed system seems like it would work alot better since its goes right through solid manifold to engine. This set up how ever all the boost goes to open space then get sucked in through the runners in my opinion that type of throttle body would be very effective on top of a blower. I think it wastes the boost and the full boost isnt utilized fully. Ok lets say you have a box with a tube out of it and you push air into the box the air coming out the tubehole is gonna be at lower pressure then if you would just push the pressure through the tube. I know the their is suction their but the forced air isnt going to each throttle body directly its just going into an open space. Also how do you know that that black box will hold an XX amount pressure also how do you know the throttle body thats farthest away from where the air is entering the space is getting the same amount of pressure as the one thats closest to it. 
Just cause they are top secret doesnt mean they are the greatest company ever. 
03-07-2006 | 11:46 AM
#51
Seems to work pretty well for BMW:
http://www.worldcarfans.com/photos.c...ml/country/gcf
I know what they do its just that a direct boost fed system seems like it would work alot better since its goes right through solid manifold to engine. This set up how ever all the boost goes to open space then get sucked in through the runners in my opinion that type of throttle body would be very effective on top of a blower. I think it wastes the boost and the full boost isnt utilized fully. Ok lets say you have a box with a tube out of it and you push air into the box the air coming out the tubehole is gonna be at lower pressure then if you would just push the pressure through the tube. I know the their is suction their but the forced air isnt going to each throttle body directly its just going into an open space. Also how do you know that that black box will hold an XX amount pressure also how do you know the throttle body thats farthest away from where the air is entering the space is getting the same amount of pressure as the one thats closest to it. Just cause they are top secret doesnt mean they are the greatest company ever.
http://www.worldcarfans.com/photos.c...ml/country/gcf
Originally Posted by SuperStasiu
I know what they do its just that a direct boost fed system seems like it would work alot better since its goes right through solid manifold to engine. This set up how ever all the boost goes to open space then get sucked in through the runners in my opinion that type of throttle body would be very effective on top of a blower. I think it wastes the boost and the full boost isnt utilized fully. Ok lets say you have a box with a tube out of it and you push air into the box the air coming out the tubehole is gonna be at lower pressure then if you would just push the pressure through the tube. I know the their is suction their but the forced air isnt going to each throttle body directly its just going into an open space. Also how do you know that that black box will hold an XX amount pressure also how do you know the throttle body thats farthest away from where the air is entering the space is getting the same amount of pressure as the one thats closest to it. Just cause they are top secret doesnt mean they are the greatest company ever.
03-07-2006 | 01:43 PM
#53
Thread Starter
Senior Member
Joined: Jan 2004
Posts: 369
Originally Posted by UK-nissan
Two issues I see, the extra wasted volume below the mouth of the trumpets will increase lag and the extra unevenness in the top of the cover will increase turbulence and reduce the flow.
Mike
Mike
It's been discussed before that the trumpets will flow better if they are spaced up off of the floor of the intake manifold instead of flush w/ the bottom of it. It's also been discussed that a larger plenum will out perform a smaller one on a naturally aspirated VQ35 and proven by dyno tests of the ever popular plenum spacers. I've never tested either theory. I doubt an increase in lag like you mention would even be measurable in any case, much less perceptible on a street car.
I haven't built the top cover yet.
Having said all that - Who cares! I need an intake that clears the hood, clears the firewall, looks trick and gets this car back on the road!
allen
03-08-2006 | 01:49 PM
#56
Originally Posted by allen22
The timing cover definately clears, I've got 3 1/4" from the intake manifold gasket to the hood on the front and about 4 1/4" on the rear by the firewall.
I'm making the intake to clear the hood, definately a must there.
allen
I'm making the intake to clear the hood, definately a must there.
allen
03-08-2006 | 09:28 PM
#59
03-09-2006 | 12:03 PM
#63
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Joined: Feb 2006
Posts: 27
Is this going to be on a boosted motor? A lot of runner length and plenum design is specific to the application. IM's on a boosted car are more forgiving in that they work well with a larger plenum and loose less area under the curve even when you use shorter runners. On an NA motor it is much more crucial to research runner length, plenum volume and taper as well.
Looks like a really cool project!
Looks like a really cool project!
03-09-2006 | 09:23 PM
#66
Originally Posted by Jeff92se
I see your point im just saying that for a FORCED induction set up. How the pressurized air is delivered to those throttle bodies. That the throttle bodies that are closer to the pipe where the pressurized air comes in will get more boost then then ones farther away. Im trying to disrespect anyone so dont get mad at me like dude above, lol just makeing an assumption
03-09-2006 | 09:23 PM
#67
It looks bad but it's not that bad. The beads are huge but even for the most part and least look like decent penatration of the metal. It's odd that they use straight pipe for the bends. When you MIG, the weld can look like that. But it's much easier to weld that way vs TIG.
It's ALOT of work to cut and weld so many pieces. Really a waste of time since ebay mandrel bends are cheap.
It's ALOT of work to cut and weld so many pieces. Really a waste of time since ebay mandrel bends are cheap.
Originally Posted by Nismo3112
That looks worse than Hal's kit...
03-09-2006 | 09:27 PM
#68
I'll say boost makes manifold design LESS prone to cylinder to cylinder variances. Because the whole thing is pressurized to the same psi.
Originally Posted by SuperStasiu
I see your point im just saying that for a FORCED induction set up. How the pressurized air is delivered to those throttle bodies. That the throttle bodies that are closer to the pipe where the pressurized air comes in will get more boost then then ones farther away. Im trying to disrespect anyone so dont get mad at me like dude above, lol just makeing an assumption
03-09-2006 | 09:36 PM
#69
no boost. thats the only pic i could find that some what resembles the vq. OBTW according to the owner that taurus is running mid-hi 12's, these are the guys mods
TO4Eturbo 1.32 turbine with a split tangential housing and V-bad discharge, .70 compressor *forgot to add 1st time*
4 inch custom cat back exhaust
Ported and polished heads, 5 angle valve job and custom ground race cams
Quaife LSD
6 puck unsprung clutch
Remapped ecu, AFC, 50lb/hr injectors, walboro fuel pump
upgraded MAF (forget what size)
4 inch custom cat back exhaust
Ported and polished heads, 5 angle valve job and custom ground race cams
Quaife LSD
6 puck unsprung clutch
Remapped ecu, AFC, 50lb/hr injectors, walboro fuel pump
upgraded MAF (forget what size)
03-10-2006 | 05:27 AM
#70
Junior Member
Joined: Feb 2006
Posts: 27
Originally Posted by SuperStasiu
I see your point im just saying that for a FORCED induction set up. How the pressurized air is delivered to those throttle bodies. That the throttle bodies that are closer to the pipe where the pressurized air comes in will get more boost then then ones farther away. Im trying to disrespect anyone so dont get mad at me like dude above, lol just makeing an assumption
If this car is not boosted I am VERY curious to see how the before and after dyno sheet look.
03-10-2006 | 06:22 AM
#71
Thread Starter
Senior Member
Joined: Jan 2004
Posts: 369
Originally Posted by notnser
You'd be wrong on this point. As someone said above boosted application are LESS sensitive to IM taper for air distribution. Boosted cars typically like a large plenum period.
If this car is not boosted I am VERY curious to see how the before and after dyno sheet look.
If this car is not boosted I am VERY curious to see how the before and after dyno sheet look.
I'll dyno it once I get it drivable w/ the wideband then re dyno later when/if I turbocharge it. Honestly, after owning, building and driving several custom turbocharged cars, I'd just like a powerful torque-y NA car. Turbocharging just kills a little something on a street car that's hard to defiine, I think it has something to do w/ throttle response.
allen
04-24-2006 | 10:34 PM
#73
Originally Posted by Ninos_Maxima
any one ever try adapting one of these???
Originally Posted by vsamoylov
such horrible piping
Originally Posted by virgilio7
bad welding.
Hey Ma we're out a argon; Just use the Acetylene
04-24-2006 | 10:46 PM
#74
nice info now I want one!!! or something similar and less money
I like the Inline vs. the staggered
I like the Inline vs. the staggered
Originally Posted by 6spd_Hayes
sorry to bring this up from the dead but....... (also, sorry for the size)
Only $6090 from http://www.topsecretjpn.com/!!!
http://www.topsecretjpn.com/engine.shtml
Only $6090 from http://www.topsecretjpn.com/!!!
http://www.topsecretjpn.com/engine.shtml
04-26-2006 | 06:54 PM
#76
Originally Posted by MaximaSE96
skylien use ITBs fed from a common manifold...its seems to work pretty well for that motor
04-30-2006 | 10:46 PM
#78
This should get things flowin,
Stock Left, Nismo Right
The caption says "Notice bellmouthing around each inlet runner. #6 is not bell mouthed to help even out flow though the plenum. "
inside of the Nismo Z-tune RB26 IM
the Bell's are much smaller/shallower than I thought
Stock Left, Nismo Right
The caption says "Notice bellmouthing around each inlet runner. #6 is not bell mouthed to help even out flow though the plenum. "
inside of the Nismo Z-tune RB26 IM
the Bell's are much smaller/shallower than I thought
01-14-2007 | 12:11 PM
#80
Reviving this one for more questions.
How is the Z33 IM working now Fred?
Did you ever go further with your second mock-up than the pics you took? I really like that idea and I think I might get crackin on it. If you don't plan to use them I'd be interested in buying those few parts you got made up already.
Questions to anyone are; for boost response is it still better to have a larger plenum or would a very small say, 3'ish liters be good in order to encourage the pressure to push into the cylinders more rapidly after the plate is cracked? Also, anyone have a good source for trumpets in steel?
How is the Z33 IM working now Fred?
Did you ever go further with your second mock-up than the pics you took? I really like that idea and I think I might get crackin on it. If you don't plan to use them I'd be interested in buying those few parts you got made up already.
Questions to anyone are; for boost response is it still better to have a larger plenum or would a very small say, 3'ish liters be good in order to encourage the pressure to push into the cylinders more rapidly after the plate is cracked? Also, anyone have a good source for trumpets in steel?
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