I had an Idea. I know people are taking the VQ35 block with the VQ30 heads and using the 00VI with them. But here is the thing. I wanted to know if it is possible to take the VQ35 engine and put VQ30 heads with the VQ35 Cams and the DEK manifold. If this is possible it would be the ultimate VQ engine.

 

Except the 3.0 heads don't flow as well as the 3.5 heads.

 

This has been talked about some. The VQ30 heads have a smaller volume, so the compression ratio goes up to around 11.3:1. If I had a second Maxima I'd do it.

 

I thought you had 2 maximas

 

Wifey's car doesn't count.

 

Why would this setup make the ultimate VQ? I thought that would be common sense. Use the 3.5 block with 02-03 VI, VQ35 Heads, VQ35 CAMS ........... everything 3.5. I have heard that the 02-03 VI is by far superior to the 00-01 (DEK) IM anyway.

 

Linky linky

 

I didnt even think that 02-03 was a VI....

 

It is in fact a "VI" or "2 stage" .

 

It wouldn't be the ultimate VQ. Tilley put down 226whp and 205wtq with a 3.5 block, 3.0 heads and a 00 VI wired completely open (Top end mode, more peak power). He put down 233whp/230wtq with full 3.5 (other than the huge 25wtq gain, area under the curve was probably better). Then he opened up the 02 IM (grinded out IM seperator) and put down 238whp/223wtq.

I have the same setup and would never use the 3.0 heads. In addition to not being able to advance the timing a ton like we will be able to with the full 3.5 (high compression), 226whp is pretty much the most you'll see, unless you go race gas. With the full 3.5 I'd see 250whp being possible with the stock intake manifold and the 5-speed tranny, and ALOT more torque (240+).

People need to stop trying to take overcomplicated hybrid/combined routes. The full 3.5 is cheaper, less time consuming and has more potential in the long run. Now if only they can get that fukcing EU working.

I don't know about the 00-01 VI. Tilley actually put down less power with full 3.5 and 00 VI, and my trap speeds are at least as high as Tilley and Krismax so I wouldn't say it gives much of, if any, advantage. Really, just buy an 800$ VQ and drop it in.

 

When are ya going to dyno and/or tune ..

 

Once again, I'm sitting on my @ss until the EU works. I know precisely jack sh*t on how to work these things, or wire them, so a) I'm not doing it myseld b) not plucking down the cash till someone proves it does work.

Trap speeds tell you the power you're making vs. weight so IMO the 00 VI is nowhere near as good as people seem to think it is, at least compared to the 2k2 manifold.

 

anybody try a 3.5 swap in a 4thgen with a sc my friend is tellin me to throw on his sc but duno

 

Stay tuned.

 

Hasn't anyone tried an unmodded 00VI and an unmodded 02VI on the same car with the same setup?

 

Didn't Rob Tilley?

You can't get an apples to apples comparison because of the difference in port shapes. A 00vi on a 2nd gen VQ35 will be mismatched enough to hurt airflow at high rpm. I think.

 

Tilley did not put down less power with the VI. He actually lost a little bit of power down low, which is useless anyways because all it would do is spin the wheels. He did gain A LOT of high end though. The VI flows MUCH better up top than the 02-03 IM. Look at the dyno graphs. The 00-01 Max. makes same power at 6200 RPMS as 02-03 Max.

 

Until somone in a VQ35 auto can put more power than me from 6000-6500 with a 00VI N/A .. I'm sticking with my 02/3 IM.

 

You can't assume that is the intake manifold either though.

 

What the hell are you talking about? He put down 224whp/210wtq with the full 3.5 and his gut*** 00 VI. His highest dyno was 238whp and that is with the 02 IM. Tilley never put down more than 238whp. The reason the 00-01 VI sucks on a 3.5 is that the ports do not align correctly, so we might never know.

There IS NO proof that the 00 VI flows better on the 3.5 than the original 2k2 intake manifold. All we hear is speculation based of 00-01 dynos. Once again, my trap speeds are at least as high as Tilley/Krismax and I'm running a simple full 3.5 with the same mods as them (H/I/E, no PS and no AC). I have trapped 104 many times recently and 105 three times. The average is in the 103.50-104.50 range.

The reason I haven't beaten my 13.3@103 time yet is that I haven't done any *****-to-the-walls runs on slicks since June, and I was experiencing timing problems at the time, I got in 3 13.3's at only 102-103 mph and that's the last time I ever ran the car that hard.

 

You said it yourself his VI was gutted, and he admittedly told me he lost a LOT of low end and midrange but did gain top end. Tilley is the master of the VQ35 swap and he has tried NUMEROUS intake manifold setups if he recommends the '00VI to me I will take his word for it.

 

Not if you port match, he port matched the DEK lower to my 3.5 bottem end. He said it's at most off by 1/8th of an inch nothing that I would notice during driving.

 

I might be making a VQ35/VQ30 heads/00vi

Unlike all these other LOSERS, mine will be tuned

 

 

Posted by JClaw in another thread:

Nope. The 2k2 IM's "VI" does nothing for the 1/4 mile, because it only optimizes low end before 4000, and you're always above 4k when you race. My 1/4 mile times went from 15.0 to 13.6 on street tires with VQ35, PS/AC removal, and H/I/E.

The 2k2 Intake Manifold is almost as sh*tty as the USIM 4th gen 3.0. It peaks around 5600 and drops off hard after 6000-6200. I've still got the 6.5k rev limit and stock ecu so my car is the 3.5 Litre equivalent of of a H/I/E 3.0 4th gen 5-speed. Most H/I/E 5sp run mid to high 14s.

JUST putting a 3.5 with absolutely no other mods will shave a full second off the 1/4 mile of a 4th gen, and probably a half second, maybe .6 off a 2k's times, so it's cheaper as well as more reliable than a SC kit, but once you change the pulley things change. There is no ".5 for displacement and .5 for VI". It's 1 second for displacement, better heads and more aggressive cams, and a few more tenths if you do other mods at the same time.

No switchover, same rev limit, just bigger nuts under the hood, simple as that.


What are you saying there buddy?

 

Maybe stock 2k2 VI sucks, but I have always told you Harris, run the 2k2 manifold but have SR20DEN do his secret mod to it. It will out do the 00VI that Tilley did. 108 traps > 103 or what ever Tilley ran.

 

I have to wait till SR20DEN puts his secret out, I should talk to him tho, Tilley is trying out the G35 Mani and other Manis so I'm also waiting on him.

 

He doesnt put it out, you send it to him and he does the work.

 

Didnt Tilley also have JWT cams as well?

 

Yes...................................

 

So even a stock 2k2 IM (JClaw) nearly outperformed, or at least was up to par with a gutted 00VI cammed 3.5L ...

 

I'm saying the "VI" is useless. The 2k2 IM has a butterfly valve and it really doesn't do much. I grinded my plate out.

Really, there is no proof that the 00 VI is better. Krismax ran a 13.35, Tilley ran a 13.30 and I ran a 13.32. Where's the "big difference"? I don't see any. We're all stuck around 13.3 until further notice.

 

Alright so in that case I'll keep my VI. I enjoy the power it makes up top.

I'm guessing the only logical explanation is the shift in power band. The VI in my opinion and I'm sure dynos will prove it flattens out the power band. The 2k2 IM is probably real good down low and what not but I'd rather have more mid and more high than just low end power.

 

"Down low" power doesn't affect your 1/4 mile time at all. You're always (in my case) between 4500 and 6500, so those times really reflect what power my 2k2 IM is making above 4500 rpms. Down low power really has nothing to do with it.

 

Your argument is like saying a sc'ed maxima is better than a turby max just because it makes peak power close to redline while the turbo max peaks at a lower RPM.

 

On a turbo max the boost peaks at a lower rpm, that does not necessarily mean the power peaks at a lower rpm. A turbo will make more power everywhere.

 

You're preaching to the choir. I know that a turbo car makes more power everywhere. He was just saying that he'd rather have the 00VI on a 3.5 just because he thinks it would have the HP peak at a higher RPM by shifting the power curve to the right. Just because the 00VI supposedly would flow better at higher RPM doesn't mean that the 2k2 vi'd car wouldn't be faster all-around anyhow.

That's why i used the sc'er vs. turbo analogy. And for maximas at least, sc'ed cars have their HP peak at very close to redline, while turbo cars peak sooner. There is much more area under the curve however with the turbo car.

Read posts before making unfounded assumptions about what people are saying.

 

I am not trying to criticize your idea, but why again are you using VQ30 heads when we just stated that 35 heads flow better and have a higher compression ............ unless you are going forced induction

 

3.5 heads have a higher compression?? Haha...nah man. You have it backwards. The 3.0 heads raise the compression ratio, although all the dyno evidence we have so far tells us that the 3.5 heads will make more power regardless of that fact.

 

Don't worry. I have my plans and others have their own. Why do some people buy Stillen? Why do people buy from Warpspeed? Why do some people do weight reduction? Why do people hate on MEVI and 00vi. Why ask why