3.5 bottom end with 3.0 heads and jwt cams in and running!
#43
Either way, an 11.5 to 1 compression 3.5 liter VQ, that car is gonna move! He also has cams, headers and full exhaust. I would imgine that he would be hitting 13's easy. What are your dino numbers before doing the swap?
-Chris
-Chris
#48
Originally Posted by nostrixoxide
Tilleys99,
Wow , that thing is running 11.5:1 CR on pump gas? How in the world do you keep the knock sensor happy ?
Wow , that thing is running 11.5:1 CR on pump gas? How in the world do you keep the knock sensor happy ?
#50
Spainishrice,
Not to be confrontational or anything like that, but just for my own personal knowledge can you please tell me what some of the vehicles that come from the factory with that high of a CR are? I'm sure with the advance in technology there has must be some vehicles out there that do have that high of a CR, so i'm not doubting you. I just want to know more about them.
I've built a few motors in my time & out here in CA where I live we only have 91 octane at the pump. So I've pretty much limited the CR in most of my engines to around 10.5:1 to avoid any pinging issues. Also one motor I built for a friend of mine was a 12:1 CR 340 small block mopar with a 2 stage wet nitrous set up for his 1971 Cuda. He pretty much had to run 108 or higher octane all the time mainly because of the CR ratio. On the dyno the motor made 880hp w/o the n2o. That motor was pretty nasty, everybody kinda look at him like a god at our local street drags back in the day. Simply because of the sound of that engine. That high CR engine had a very aggresive tone to it. Kinda like "DON'T LAUGH NOW" but it was like (bopity bopity bopity bopity bop)
Well anyways, any cars you can tell me about would be cool, thanks!!!
Not to be confrontational or anything like that, but just for my own personal knowledge can you please tell me what some of the vehicles that come from the factory with that high of a CR are? I'm sure with the advance in technology there has must be some vehicles out there that do have that high of a CR, so i'm not doubting you. I just want to know more about them.
I've built a few motors in my time & out here in CA where I live we only have 91 octane at the pump. So I've pretty much limited the CR in most of my engines to around 10.5:1 to avoid any pinging issues. Also one motor I built for a friend of mine was a 12:1 CR 340 small block mopar with a 2 stage wet nitrous set up for his 1971 Cuda. He pretty much had to run 108 or higher octane all the time mainly because of the CR ratio. On the dyno the motor made 880hp w/o the n2o. That motor was pretty nasty, everybody kinda look at him like a god at our local street drags back in the day. Simply because of the sound of that engine. That high CR engine had a very aggresive tone to it. Kinda like "DON'T LAUGH NOW" but it was like (bopity bopity bopity bopity bop)
Well anyways, any cars you can tell me about would be cool, thanks!!!
#52
Originally Posted by nostrixoxide
Spainishrice,
Not to be confrontational or anything like that, but just for my own personal knowledge can you please tell me what some of the vehicles that come from the factory with that high of a CR are? I'm sure with the advance in technology there has must be some vehicles out there that do have that high of a CR, so i'm not doubting you. I just want to know more about them.
Not to be confrontational or anything like that, but just for my own personal knowledge can you please tell me what some of the vehicles that come from the factory with that high of a CR are? I'm sure with the advance in technology there has must be some vehicles out there that do have that high of a CR, so i'm not doubting you. I just want to know more about them.
Concerning the 11.5:1 CR on this 3.5/3.0 VQ, I personnally think it's quite dangerous because the motor wasn't designed for that type CR. All it may take to blow the motor will be a WOT run in 3rd or 4th gear. Frankly, I don't know if this VQ will last a dyno run or not because 4th gear is the dyno gear and that's a lot of load over a long period of time. I guess we'll see. There are a lot of turbo Maximas without problems so.....
#55
Last edited by Maximeltman; 08-31-2011 at 01:17 AM.
#57
3.5 block and I dont see a problem with the compression holding up to a 4th gear dyno considering I beat it for about 200 miles and no problem except overheating but i think it just needs a higher pressure rad cap.
#58
the new M5 is going to have a 12:1 CR....so is a few other cars that are coming out soon....I know a lot of the audi's and other cars that are coming out with direct injection engines are running 12 and even 12.5:1 CR engines...!! if you recall...saab even came out with a prototype engine which was variable CR...by altering the angle of the head on the block...forgot where the article was....
I believe the S2000 is 12:1...
I believe the S2000 is 12:1...
#61
Originally Posted by Dave B
Both Honda and Toyota have been running 11:1+ CRs with 87 octane in a lot of their current model motors. The advances in variable cam timing, piston design, and knock detection systems have really pushed the envelope when it comes to running high CRs in stock motors.
Concerning the 11.5:1 CR on this 3.5/3.0 VQ, I personnally think it's quite dangerous because the motor wasn't designed for that type CR. All it may take to blow the motor will be a WOT run in 3rd or 4th gear. Frankly, I don't know if this VQ will last a dyno run or not because 4th gear is the dyno gear and that's a lot of load over a long period of time. I guess we'll see. There are a lot of turbo Maximas without problems so.....
Concerning the 11.5:1 CR on this 3.5/3.0 VQ, I personnally think it's quite dangerous because the motor wasn't designed for that type CR. All it may take to blow the motor will be a WOT run in 3rd or 4th gear. Frankly, I don't know if this VQ will last a dyno run or not because 4th gear is the dyno gear and that's a lot of load over a long period of time. I guess we'll see. There are a lot of turbo Maximas without problems so.....
But there are lots of maximas on here that are boosting there cars on here with stock compression and when adding forced induction to a car you increase the compression within the cylcinders. So I don't think it will be a big deal.
So the car has overheated? Bigger radiator is your still using 3.0 one?
#63
Spanishrice,
Thats is true boosting does increase cylinder pressure & tempature. But alot of the guy's who are running higher boost levels are running some form of race gas wheather it be store bought, homemade or simply just the additiona of a can of octain booster to the tank. Higher octain fuel burns cleaner, cooler & slower. So it's a big deal when trying to counter act detonation/pinging. Not to mention these guy's generally have the electronics needed to adjust there timing & colder plugs to help pull excess heat from the combustion chamber etc. etc. All these things are needed to help ward off the evil ping monster...
Thats is true boosting does increase cylinder pressure & tempature. But alot of the guy's who are running higher boost levels are running some form of race gas wheather it be store bought, homemade or simply just the additiona of a can of octain booster to the tank. Higher octain fuel burns cleaner, cooler & slower. So it's a big deal when trying to counter act detonation/pinging. Not to mention these guy's generally have the electronics needed to adjust there timing & colder plugs to help pull excess heat from the combustion chamber etc. etc. All these things are needed to help ward off the evil ping monster...
#64
Originally Posted by nostrixoxide
Spanishrice,
Thats is true boosting does increase cylinder pressure & tempature. But alot of the guy's who are running higher boost levels are running some form of race gas wheather it be store bought, homemade or simply just the additiona of a can of octain booster to the tank. Higher octain fuel burns cleaner, cooler & slower. So it's a big deal when trying to counter act detonation/pinging. Not to mention these guy's generally have the electronics needed to adjust there timing & colder plugs to help pull excess heat from the combustion chamber etc. etc. All these things are needed to help ward off the evil ping monster...
Thats is true boosting does increase cylinder pressure & tempature. But alot of the guy's who are running higher boost levels are running some form of race gas wheather it be store bought, homemade or simply just the additiona of a can of octain booster to the tank. Higher octain fuel burns cleaner, cooler & slower. So it's a big deal when trying to counter act detonation/pinging. Not to mention these guy's generally have the electronics needed to adjust there timing & colder plugs to help pull excess heat from the combustion chamber etc. etc. All these things are needed to help ward off the evil ping monster...
#65
Damn this is sweet, looks like allmost a direct bolt on 3.5 for the 4th gen. I'm wondering, couldn't you allso use the head of a 3.5 and just put all the sensors and **** of the 4th gen on a 3.5 engine? Or is the head of a 3.0 realy that different from a 3.5?
#66
Originally Posted by v6maximus
Damn this is sweet, looks like allmost a direct bolt on 3.5 for the 4th gen. I'm wondering, couldn't you allso use the head of a 3.5 and just put all the sensors and **** of the 4th gen on a 3.5 engine? Or is the head of a 3.0 realy that different from a 3.5?
#76
I would be scared to think of how much power you would be putting out with a mevi and aftermarket ecu!!! as well as all the other bolt-on's...ie. UDP, intake and you already have full exhaust...
#80
Originally Posted by v6maximus
I I would use a 5th gen ECU, could I just swap in a VQ35? Or do I have to rewire the car completely?
you have to swap out the entire wiring harness for the whole car. you also probably have to swap out things like fuel pump, evap system, etc...