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*DandyMax* · 05-09-2008, 04:08 PM

*Warning* - long post... oh, and some 3.5 swappers may flip out after reading this...

J/K

So I got on the dyno this morning to finish up my tuning on the cammed DEK, seeing as I'm heading to the track tomorrow for one last hurrah with the 3L to hopefully beat my PB with it before putting the 3.5 in. So obviously I wanted it running and tuned up in top notch shape for tomorrow.

Anyways, I started off with just a straight baseline pull to see where it was at, and it put down about 246 whp. But viewing the loggers I could see it needed some tuning, so after 10-12 pulls and a bunch of playing with fuel and ignition timing I had it running up around 263 whp. Once I optimized it at that level then it was time to open the cutout and make some noise! I did so and after a little more tweaking I just about hit 270 whp at 7500 rpm, actually it came out as 269.87.

So it goes without saying I'm happy with that. Interestingly enough, the modeling I'd done before building the engine predicted around 275 whp at 7700 rpm, and I was skeptical at the time that it was accurate (never fully trust software lol), but hey the program was just about bang on. It does require meticulously measuring and inputing data to get that close though.

So below I've posted 2 graphs, the first one is the best run from today, and the second is just a fun comparison with my 220whp run from 2005 (with stock DE cams and 00VI). The cams have obviously shifted the power band as one would expect, although I have changed more than just cams between the 2005 dyno to now.

You'll notice the dip in the first graph at 6500 rpms, that spans approximately 200 rpms - that unfortunately is unavoidable and is due to the EU adding fuel to get past the stock limiter. There is a momentary rich spike that drops out the power for a split second, but keep in mind that 200 rpms goes by VERY quickly, especially in the lower gears and is almost unnoticeable in the car. It looks big and ugly on the DJ graph, but in reality affects the performance of the car barely at all. I can positively say that the car pulls pretty smoothly through that area, even in 3rd and 4th gear, despite how it looks.

A couple more thoughts: calculating out the crank horsepower gives me somewhere in the 315 range, meaning this engine is doing easily 100 hp per litre. Woot! Also, you can see that it really would have liked to rev to 8000-8200 rpm, if the oil pump/bottom end would have allowed... peak would have been around 7700 or so I believe, probably 273, 274 whp, or something like that. But I am not taking it higher than 7500/7600 now, don't want to blow another pump.

Oh, guess I should post the engine mod list applicable to today's dyno as well:

VQ30DE-K Swap
VQ35 Oil pump w/ low pressure cut off switch
VQ35 JDM cams (similar specs to JWT S1)
VQ35HR valve springs and retainers, double shimmed
Mild head "work" (NOT ported though)
Unorthodox flywheel
Exedy Stage 1 clutch
Greddy EManage Ultimate
Pathfinder TB
Stock DEK crank pulley
Custom intake w/ MAF delete
Cattman headers/y-pipe/catback (plus cutout)
Low temp T-stat
Walbro fuel pump
Returnless fuel rail w/ adjustable FPR

First graph: Best run

Second graph: Comparison 2008 to 2005

05-09-2008, 04:08 PM	#1
DandyMax 3.5 in the works 98 Maxima SE Join Date: Jun 2004 Location: Ontario, Canada iTrader: (7) Posts: 2,458	Dyno - cammed DEK!! ruh roh Warning - long post... oh, and some 3.5 swappers may flip out after reading this... J/K So I got on the dyno this morning to finish up my tuning on the cammed DEK, seeing as I'm heading to the track tomorrow for one last hurrah with the 3L to hopefully beat my PB with it before putting the 3.5 in. So obviously I wanted it running and tuned up in top notch shape for tomorrow. Anyways, I started off with just a straight baseline pull to see where it was at, and it put down about 246 whp. But viewing the loggers I could see it needed some tuning, so after 10-12 pulls and a bunch of playing with fuel and ignition timing I had it running up around 263 whp. Once I optimized it at that level then it was time to open the cutout and make some noise! I did so and after a little more tweaking I just about hit 270 whp at 7500 rpm, actually it came out as 269.87. So it goes without saying I'm happy with that. Interestingly enough, the modeling I'd done before building the engine predicted around 275 whp at 7700 rpm, and I was skeptical at the time that it was accurate (never fully trust software lol), but hey the program was just about bang on. It does require meticulously measuring and inputing data to get that close though. So below I've posted 2 graphs, the first one is the best run from today, and the second is just a fun comparison with my 220whp run from 2005 (with stock DE cams and 00VI). The cams have obviously shifted the power band as one would expect, although I have changed more than just cams between the 2005 dyno to now. You'll notice the dip in the first graph at 6500 rpms, that spans approximately 200 rpms - that unfortunately is unavoidable and is due to the EU adding fuel to get past the stock limiter. There is a momentary rich spike that drops out the power for a split second, but keep in mind that 200 rpms goes by VERY quickly, especially in the lower gears and is almost unnoticeable in the car. It looks big and ugly on the DJ graph, but in reality affects the performance of the car barely at all. I can positively say that the car pulls pretty smoothly through that area, even in 3rd and 4th gear, despite how it looks. A couple more thoughts: calculating out the crank horsepower gives me somewhere in the 315 range, meaning this engine is doing easily 100 hp per litre. Woot! Also, you can see that it really would have liked to rev to 8000-8200 rpm, if the oil pump/bottom end would have allowed... peak would have been around 7700 or so I believe, probably 273, 274 whp, or something like that. But I am not taking it higher than 7500/7600 now, don't want to blow another pump. Oh, guess I should post the engine mod list applicable to today's dyno as well: VQ30DE-K Swap VQ35 Oil pump w/ low pressure cut off switch VQ35 JDM cams (similar specs to JWT S1) VQ35HR valve springs and retainers, double shimmed Mild head "work" (NOT ported though) Unorthodox flywheel Exedy Stage 1 clutch Greddy EManage Ultimate Pathfinder TB Stock DEK crank pulley Custom intake w/ MAF delete Cattman headers/y-pipe/catback (plus cutout) Low temp T-stat Walbro fuel pump Returnless fuel rail w/ adjustable FPR First graph: Best run Second graph: Comparison 2008 to 2005 __________________ 2000. 3L. 5-spd. Black on black. SE. (DD) 1998. 3L. 5-spd. Sterling Mist. SE. (fun car) 1/4 mile stats (all N/A VQ30): Best 60': 1.73 Best ET & trap: 12.61, 108.98 mph Click to see the video. More videos also here. Mods list and dyno here (as of May 9/08). My EU writeup can be found at VQ Power. Last edited by DandyMax; 07-05-2008 at 12:13 PM.