VQ35 SC : 426 hp @ 6000 & 387 ft-lb @ 5300
12-20-2006, 05:49 AM
#1
SC Overspinning Swapper!!
Thread Starter
iTrader: (19)
Join Date: Jan 2003
Location: Houston, Tx
Posts: 378
VQ35 SC : 426 hp @ 6000 & 387 ft-lb @ 5300
The following thread contains an itemized list of my mods. Mods thread here
The only change is the addition of RC550 injectors. OEM ECU is still caring for engine management and SAFC is used for fine tuning. It idles a bit rich at about 12.5:1, but other than that no start problems nor drivability issues at part-throttle (frankly I was surprised). I had no trouble tuning my WOT runs either. The attached "VQ35 on Boost vs. VQ35 on Juice" chart with AF shows a bit of lean condition early on, but I have since fixed that. Since I don't have cats, I thought my wideband and dyno wideband would read about the same, but my Innovate EUGO was reading about .1-.2 richer than that tail sniffer AF shown in the chart.
Quick mods list:
-VQ35 w/ VQ30 timing equipment
-V2 Vortech SC - 2.62" pulley
-Front Mount Intercooler
-5-speed VLSD
-True dual 2.5" exhaust
Max boost is 13 psi, at redline of course. As far as I could tell, there was no belt slip.
Best of 3 runs:
SAE:
426 hp @ 6000
387 ft-lb @ 5300
Uncorrected:
436 hp @ 6000
398 ft-lb @ 5300
Baseline vs. 13psi SC:
Note: Baseline did not include headers and true dual exhaust.
VQ35 on Boost vs. VQ35 on Juice
Green line: 130 N20 shot
Red line: 13 psi SC
I have been asked for dyno vids and exhaust clips. Well, I have finally made some time and uploaded a couple of the dyno pulls from my last trip to the dyno.
Video 1: Front of Car View with car strapped on dyno
Video 2: Driver’s side view. Sound of car when turned on and WOT exhaust sound from exterior.
Excuse the dyno operator’s commentary. He was dumbfounded as to why I had a blow off valve on a supercharged engine. This particular dyno run shows a lean condition early on, but it has since been fixed. I was targeting a 13:1 A/F at the 1-2 psi range and slowly decreasing to 11:1 at redline.
Video 3: Exhaust sound inside car Some of you wanted to hear what my exhaust sounds like inside the car. This vid on the dyno was taken inside inside the car, 3 of 4 doors open, and zoomed in on boost gauge.
Quick highway pull, a bit a throttle feathering when in 3rd gear (to avoid spinning) and finally a WOT punch in 4th....enjoy
Here is a link: http://s126.photobucket.com/albums/p...ent=60-130.flv
The only change is the addition of RC550 injectors. OEM ECU is still caring for engine management and SAFC is used for fine tuning. It idles a bit rich at about 12.5:1, but other than that no start problems nor drivability issues at part-throttle (frankly I was surprised). I had no trouble tuning my WOT runs either. The attached "VQ35 on Boost vs. VQ35 on Juice" chart with AF shows a bit of lean condition early on, but I have since fixed that. Since I don't have cats, I thought my wideband and dyno wideband would read about the same, but my Innovate EUGO was reading about .1-.2 richer than that tail sniffer AF shown in the chart.
Quick mods list:
-VQ35 w/ VQ30 timing equipment
-V2 Vortech SC - 2.62" pulley
-Front Mount Intercooler
-5-speed VLSD
-True dual 2.5" exhaust
Max boost is 13 psi, at redline of course. As far as I could tell, there was no belt slip.
Best of 3 runs:
SAE:
426 hp @ 6000
387 ft-lb @ 5300
Uncorrected:
436 hp @ 6000
398 ft-lb @ 5300
Baseline vs. 13psi SC:
Note: Baseline did not include headers and true dual exhaust.
VQ35 on Boost vs. VQ35 on Juice
Green line: 130 N20 shot
Red line: 13 psi SC
I have been asked for dyno vids and exhaust clips. Well, I have finally made some time and uploaded a couple of the dyno pulls from my last trip to the dyno.
Video 1: Front of Car View with car strapped on dyno
Video 2: Driver’s side view. Sound of car when turned on and WOT exhaust sound from exterior.
Excuse the dyno operator’s commentary. He was dumbfounded as to why I had a blow off valve on a supercharged engine. This particular dyno run shows a lean condition early on, but it has since been fixed. I was targeting a 13:1 A/F at the 1-2 psi range and slowly decreasing to 11:1 at redline.
Video 3: Exhaust sound inside car Some of you wanted to hear what my exhaust sounds like inside the car. This vid on the dyno was taken inside inside the car, 3 of 4 doors open, and zoomed in on boost gauge.
Quick highway pull, a bit a throttle feathering when in 3rd gear (to avoid spinning) and finally a WOT punch in 4th....enjoy
Here is a link: http://s126.photobucket.com/albums/p...ent=60-130.flv
12-20-2006, 01:39 PM
#16
SC Overspinning Swapper!!
Thread Starter
iTrader: (19)
Join Date: Jan 2003
Location: Houston, Tx
Posts: 378
Originally Posted by Kevlo911
You need an emanage to control the timing.
E-manage could greatly aid in fuel management, especially to scale down my RC550cc injectors. Surprisingly, the stock ECU, Z32 MAF, FMU, and SAFC are doing shockingly well for my fuel management; evident in the smooth AF line shown in the “VQ35 on Boost vs. VQ35 on Juice” chart above.
Originally Posted by speed racer
damn. I'm speechless. Keep up the good work. Is the tranny still holding?
12-20-2006, 02:23 PM
#19
?? Nitrous curve ??
Not that anybody probably noticed, but the N2O curve seems very erratic compared to the NA and boost curves, and showed only 100 HP improvement, and I think you said you sprayed a 130-shot on that pull? Anyway, the N2O curve was ... strange..... Maybe your tires slipped or spun on the rollers?
That's a group of HP from your 3.5, any way you slice it. Those numbers give me a chill - pretty frickin' impressive, dude. Planning on some track time soon?
That's a group of HP from your 3.5, any way you slice it. Those numbers give me a chill - pretty frickin' impressive, dude. Planning on some track time soon?
12-20-2006, 02:33 PM
#20
SC Overspinning Swapper!!
Thread Starter
iTrader: (19)
Join Date: Jan 2003
Location: Houston, Tx
Posts: 378
Originally Posted by SonicDust187
What fmu disk are you using and does the J&S sense any knock or is it quiet?
Prior to the SC setup and the colder plugs, I used regular fuel to fine tune J&S knock sensitivity on my VQ35. Even with 87 octane, I would only pick up the ocassional knock at WOT...great way to save on fuel costs
12-20-2006, 08:09 PM
#28
Very nice indeed! Looking forward to track times, or at least trap speeds if traction's a problem.. hehe
Can you send me the run files please? dvrditar @ hotmail . com (no spaces) Thanks!
Can you send me the run files please? dvrditar @ hotmail . com (no spaces) Thanks!
12-21-2006, 06:45 AM
#33
SC Overspinning Swapper!!
Thread Starter
iTrader: (19)
Join Date: Jan 2003
Location: Houston, Tx
Posts: 378
Originally Posted by PharoNDmist
Nice numbers. I bet you could probably squeeze out another 15-20hp/tq with a 3inch exhuast
Hmmmmmm….no. The cross-sectional area for a single 3” pipe is a mere 7.07 in^2 while my two 2.5” pipes tally up to 9.8 in^2. Furthermore, most after-market y-pipes and headers have a 2" manifold collectors, or 2.25" at best. I can't imagine that a pair of 2" header collectors are good for anything over 300 hp, much less anything pushing the 500 bhp mark.
I was told that for my displacement, 3" header collectors and dual 2.5" pipes would cause too much tq loss because of poor scavenging effect, low exhaust velocity, blah, blah, blah. Even with the Z33 manifold (which provides less tq than the A33 intake), I still managed to squeeze 300 wtq at 3800rpm, and 350 wtq by 4500rpm....so much for a torque deficiency.
...or did you mean dual 3" pipes? I know of a couple 350z with 3" duals, all with built motors and boosting way more than me. Now that would be overkill for my set up.
Just in case you missed them:
Custom 3” header collector to a 2.5” pipe
X-pipe and Wideband O2 bung
Poorly created panoramic view of my exhaust….
