Of course bigger is not always better, but in the case of plenum volume and TB/elbow size, it has been proven to be better up to a certain point (beyond the point of the stock 02VI and 70MM TB). You should also remember that the 00VI in stock form is on an engine that is smaller displacement with heads that flow less and thus works better than it would on a larger engine that flows more air. There is no doubt that the DEK does better at high revs (although still less actual power) than the VQ35, but that has more to do with the stroke increase than IM design.

Honestly, it's entirely possible that the 00VI would outperform the 02VI at low RPMs and low throttle, and I know how you are about those situations... It might meet your goals.

 

My primary goal for power delivery is to get the most power under the curve while at the drag strip and still retain street manners. If I want to feel more power, I just press the gas down more... lol

 

Don't let your antics mix you up.....I'm about torque.....and driveability....If I WAS WORKING ON A 00VI IM SETUP FOR A VQ35...It would be pretty stupid to use a puny VQ30 TB. As for those smaller ports of the VQ35, it's velocity is higher so it's LOW LIFT flow will be better, that's no rocket science! But just looking at the length of the runners of the 00VI it's should exhibit a pretty good ram effect into the cylinders on the low and high rpm ranges. That plenum volume maybe on the small side but the total IM volume including the runners, plenum, and ports are more on the VQ30 ....Wish I had an extra VQ35 laying around it would be a good test bed for alot of experiments with these two IM.....

 

You do realize that the intake side of the maxima VQ35 heads outflow the 3.0 heads all the way to the most lift they tested, right? They were not catching up, even at high lift. Only the exhaust side caught up at higher lift, and you have been specifically targeting the intake side with the "bigger ports" comments.



Long/narrow runners increase velocity for low end power, short/fat runners increase high end power... It's kind of hard to eyeball a set of runners and say they are good for both, but I will take your word. Plenum volume is what we are talking about... Runner length/width and subsequent volume are important, but not to be added to plenum volume and then say the plenum is bigger.

It would be nice if someone tested it, I am just a bit doubtful.

 

Wow I think you're reading into a bit more than what I said! I realize that plenums were what was being talked about in your last 4-6 post replies...specificially the miniture size of the VQ30! But total Volume is an important factor as well....and the VQ30 has long intake runners of course for low speed and yes it has short fat for the high speed side as well with a better flap design then that of the VQ35....It's kinda like comparing some 6x40mm sidedraft carb setup to (1) 500 cfm 2 barrel carb....anyway Yes the VQ35 is a better flowing head according to your charts @ whatever inches of water which isn't illustrated....So no telling where the charts originated from....but I'm just interested in and intrigued by the 00VI IM design and it would be nice to see how much cfm one could support vs a VQ35 02VI....

 

Although I do like the idea of the butterfly valves to swap runners (was great on my QR25), I do feel that the plenum volume and elbow/TB diameter alone would cripple the project before starting. Then, getting started anyway, you can swap to 3.0 heads and trade a "better IM" for heads that flow worse, or you can bore out the 00VI LIM and 3.5 heads, possibly causing a sudden velocity drop right before the valves to unknown effect.

Tilley ran the 00VI on his bolton 3.5 with JWT cams for a long time, I believe his best was 13.3@103ish with 230ish whp dynos. This is in the same time period that SR20DEN ran the 12.8@108 on the original SSIM (stock cams) and got his 263-265whp dynos. There was another who ran the 00VI on a 3.5, but ended up swapping back to the 02VI around the same time he got rid of his JWT ECU, and still ran the same times at the track (edit: krismax... read post below).

If you search, there are tons of threads in the 2003-2006 range about 00VI vs 02VI. Not much actual testing due to differences, and the general consensus then was 00VI >>>>>>>. Fast forward past Tilley, krismax and other results, and this swap has mostly gone quiet. I do hope someone does it as I would like to see the results, but I think the non revup 350Z IM with a spacer may be a better "partially tested" pipe dream for power from idle to 6k+ and probably easier to pull off.

 

Ah krismax was the other guy...


quoted from http://forums.maxima.org/all-motor/5...ml#post6346907

 

what an interesting thread

 

Thanks for confirming what I said in post #3 of this thread. lol

 

This is not 100% relevant to the initial subject of this thread... but an interesting dyno regardless.

This is a spacer + Mrev setup (blue) vs the newer (V2) Kinetix velocity manifold (red) for the RWD cars... It's still rising at 6.5k on stock cams, very cool! Looks like it could fit for us by just changing the direction of the elbow and of course using the Z LIM. Not sure on hood clearance, however.

In this dyno, that mid 5k "dip" looks much more like the visual byproduct of a 4.5-5k "hump", which could easily be caused by intake resonance at that RPM range.

 

I might be blind, but which color is for mrev and which is for kinetix?

 

The Kinetix is red!