3.5 block
Tomei 256 cams
VQ30det heads.

Would it work out

 

Yes it would, but there is NO reason to use the inferior 3.0 heads.

Full VQ35DE/Tomei cams would be much better.

 

Ok SR20.


Ease of installation comes to mind.

 

Why the DET heads? Do you know for a fact that they have different vavletrain?

 

I really don't see why he'd go through the trouble of buying the det heads when he could just use the 3.5 heads. I think Tilley's before/after results are enough to convince anyone.

Why would it be easier to install? If he doesn't want to drill the 3.5 cams he can just use his 3.0 cams, and then it wouldn't really be longer than tearing down both motors.

And besides, I think the Tomei cams have the holes already drilled for both 3.0 and 3.5 (not sure, it might be JWT's).

 

Can you show me those before/after results? I must have missed that.

Supposedly, the HKS cams do, however supposedly the VQ30DET/VQ35 version don't exist at least from what I've read/found.

 

Check the dyno forum, it can't be too far back. He dynoed 205wtq and 226whp with 3.0 heads, JWT cams and a 00-01 VI, which flows MUCH better than the 4th gen manifold. So with the 4th gen maxima, he was probably in the low 200whp area.

He dynoed 233whp and 230wtq with the full 3.5, and 238whp/223wtq with the butterflies removed (or something like that) on the 2k2 manifold/2k2 heads.

 

He dyno'd:

226hp/205.4tq(PEAK hp 6400rpm)
1)3.5 block, 3.0 heads, JWT cams, headers, 00VI WIRED COMPLETELY OPEN

232.79hp/230.9tq(PEAK hp ~5500rpm)
2)Full VQ35 including heads AND IM

238.46hp/222.84tq
3)Same as 2), but modded 2K2 IM.


1) vs. 2)
He gained ~7whp/26wtq with VQ35 heads and stock VQ35 IM over the 3L heads/00VI, however the 00VI was HELD open which sacrificed torque. So, how does ~7whp show the VQ30 heads are inferior? Could it have been the difference between the IMs? BOTH heads and IM played a role. Also, look at where the PEAK whp was located, ie VQ30 heads/DEK IM at 6400rpm vs. VQ35 heads/IM at 5500rpm. Right there you see the INTAKE MANIFOLD is making a difference and if you continued further with a higher redline, the whopping ~7whp "inferior" VQ30 heads/DEK would continue to pull a ways. On top of that, his AFR was pretty bad...at least on the 3L heads/DEK dyno.

1) vs. 3)
He gained ~12.5whp, but a lower 17.5wtq. So, AGAIN if the DEK manifold was able to use the longer runners, who knows how close torque could have been. Mod the DEK and we'd see that hp gap even smaller, so where's the BEEF, aka superior VQ35 heads now?


In short, YES the VQ35 heads are superior due to their larger valves/high port angle, however Tilleys' dynos have NOT shown how much the heads add exclusively. As for VQ30/VQ35 hybrid compression ratio of 11.5 vs. stock VQ35 10.3, you can assume whatever you want, but unless there was better fuel tuning and especially timing tuning, you can't ASSume how much that contributed. Plus, with only PEAK numbers to go off of, you/we can't really assume too much.

If Tilley had both setups tuned to a decent AFR and timing advance as far as possible for the fuel octane he uses, we know the VQ35 heads/IM would be superior. However, with the ONE dyno I have seen and the other two dyno peak values, you can't assume whether the torque gain or horsepower gain came from the heads, IM, heads+IM, better tuning, or non-working DEK vs. working VQ35 IM.

 

The 00-01 VI is said to flow better than the 2k2 manifold, at least that's what he and Krismax said. So, the full 3.5 dynoed more even with the 2k2 manifold.

 

lets think about this 00vi on 3.0 heads 6400rpm peak ,and 2k2 manifold on better heads 5500rpm peak. what im saying is the 2k2 IM is crap and the 00vi the best of the bunch. the real test would be 00 vi on both dynoed. that will show what heads are diff.

Tilley gained over 3 1/2 mph in trap over 2k2 manifold modded with the 00vi (power rod was removed thats all)

 

No. Tilley did 99.9 mph back when he had the hybrid (3.0 heads and 4th gen manifold). He never ran with the full 3.5/2k2 manifold.

Here on September 26th he ran 14.06 and then 13.87 in October with the 3.0 heads/US 4th gen manifold, all at 99 mph:
http://forums.maxima.org/showthread.php?t=340606

EDIT:Here on November 6th he ran a 13.92 with 3.0 heads and MEVI (But no extended rev-limiter):
http://forums.maxima.org/showthread.php?t=352156

But no track times with 3.0 heads + 00-01 VI, and no track times for 3.5 heads + 3.5 manifold.

 

I got off on a tangent, however my point WAS that the one dyno chart and the other two dyno peak values is NOT enough data to conclude how much better the VQ35 heads are then the VQ30 heads or how much better the DEK is then a stock 2K2 or modified 2K2.

Tuning ESPECIALLY the timing with a 11.5 CR motor is crucial for the octane/gas used.

The VQ35 heads/manifold are what the factory designed for the 10.3:1 CR, so I'd assume out of the box it would perform better then the DEK stuff at 11.5:1 with no tuning. Also, Tilley could really pump out more power with the full VQ35 by advancing timing considerably, since from the factory VQ35s run far more advance then his 4th gen ECU provides.

In short, neither of Tilleys 3 or 4 setups have been OPTIMIZED to see what the full potential could be, so I'd hold off until others follow his lead and start tuning/tweaking to see what they are really capable of. Then after we have a few dynos from different people, we can start declaring "Combo X" is inferior/superior to "Combo Y". Just my .02, but we know from SR20DENs dynos that if you can help the full, ECU included, VQ35 breath and fine tune just the AFR, it will be the winner.

 

Yes, 3.5 ecu/full 3.5 is better as it is, but if you advance the crap out of the timing and put SR20's manifold on a full 3.5 with 3.0, it would probably put down similar numbers.

 

Except that the valves on the 3.0L heads are smaller. It might have similar numbers at relatively stock tuning, but your overall ability to gain more power is reduced (IMHO) when you try advanced tuning...

 

what was that?

 

He means using the VQ30DE ECU.

 

I was talking about a full 3.5 with 3.0 ECU. Same as what SR has, except no VTCs (which increase power at lower RPMs).

 

Ahhh...my bad. I thought you just left out the word "heads" in your description...

 

New track time at poor track 13.89 @103.65.....with vq35 heads/bottomend/00vi/vq30 JWT cams/obx headers/and a UDP. Friday comes the new 00VI im workin on in action at a good track.

 

Tilley fill up your PS fluid!! J/K I'm sure you've already filled up that almost empty reservoir. You're getting another 00VI? Did you have probs w/your last one?

 

It's the same. He just emptied its insides.

 

Working DEK manifold or just zip tied?

Which ECU, stock or JWT?

 

His rev-limiter is 7300 so I assume he has JWT.

 

You're probably right, but he swaps back-n-forth with krismaxs' ECU unless he's got his own or is using it until krismaxs' car is running.

 

With JWT ECU/00vi with no divider

 

No power valve?

 

http://forums.maxima.org/showthread.php?t=395063

 

This run was before that.....

 

How about this then
3.5
3.0 timing
tomei 256 w/spacers
TB convert to cable
2k1 ECU to remove EGR.

 

So will this work. This project something I am very interested in. Another question, since you are using the 3.0 timing and cover couldn't you use the 2k-2k1 supercharger if you wanted to go boost.

 

i heard the tomeis are like a 3-4 month wait.