He just use a 3.5 bottom end (Crank, Rods, Pistons, Block, oilpan).

 

very nice. get some numbers soon. depending on what kinda numbers you put down i might be interested in this setup.

 

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

 

nice keep us posted

 

dyno #s before were around 176hp and 185tq

my butt dyno says its a big improvement walkin a na 300zx that ran 14.9s is proof of that

 

Great, well we have some real numbers to compare it to then, I cant wait to see what the dyno #'s will be now.

-Chris

 

Tilleys99,

Wow , that thing is running 11.5:1 CR on pump gas? How in the world do you keep the knock sensor happy ?

 

there are card that coem from the factory with that high compression. I bet you it would help to tune it.

 

k all i wanna know is how much was the total cost of all this?

 

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!!!

 

Way to go Tilley! Can't wait for numbers.

 

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.....

 

Nice job tilley, I knew it could be done.

Cant wait to throw it in my 4th gen. Muahhah thoes stangs wont know what hit em.

 

As long as no animals were harmed during this experiment I'll be happy. Way to go man.

 

Wow, That's tight man! Post the specs soon.
________
Children zoloft

 

Which Block R U Using 3.0 /3.5

 

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.

 

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...

 

its been stated several times in this thread.

 

Tilley, you gonna get the NISMO radiator cap?

 

What he said.

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?

 

Are the cylinder bores the same, or how did the heads interface with the block? Any modifications there or just slap them together?

 

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...

 

And it increases displacement. If Mardi can run one bar on stock engine I am sure he can run the 11.5.1 compression ratio. Plus he has aftermarket cams with a higher overlap which help with the detonation

 

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?

 

you can'y use 4thgen sensors on the 5th gen I don't think becuase you would need the 5th gen ecu to use the 5th gen intake manifold and head.

 

Tilley, what's the Combustion chamber difference between the Turbo heads and the USDM heads? Would it affect the compression too drastically?

 

the 3.5 heads have different shaped intake ports and extra oil feeds for the var cam timing but im working on getting around that for my turbo motor

combustion chamber is the same.

 

well just about 300 miles and running strong

 

What tranny are you using? Did you just stick with the 5 spd or did you switch over to the 6 spd since it bolts right up to that block?

-Chris

 

its the 5spd tranny

 

Damn dude I admire your work... I really really do!

 

can't wait to see a vid of that thing and a dyno graph...I would love to hear what it sounds like...

 

sept 11th it will be dynoed

 

cant wait to see number

 

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...

 

watch out for the taliban.

 

I I would use a 5th gen ECU, could I just swap in a VQ35? Or do I have to rewire the car completely?

 

Swapping a VQ35 would be a lot more work; talk to Vlad about it.

~THT

 

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...