I guess that knock limit is alot greater when All motor. Was wondering if the same theory and tuning method would apply n/a as much as it applies to FI, guess not.

 

good #s Aaron !

 

Thanks guys!

I don't get any knock unless I start trying to get over 28-29 degrees around 4-4.5rpm. I can advance it to 33 degrees on top end without any knock at all.

The engine puts down the best power at the timing it is now. And knock is not even close to being an issue. I bet I could run lower octane fuel if I wanted to and not get any knock. But I'd never run anything lower than 93 octane in this engine.

Thanks. Every VQ35 is different. But they are all similar in a way that it makes best power in the range you mentioned. But fine tuning the timing is needed with every engine. Cause we were able to see noticeable HP differences by only changing timing by a half degree.

I think I have it at 7600 now. I had it set at 7800 during the testing though. But the stupid speed limiter prevents me from stretching out 3rd gear all the way. The 03 Maxima 6spd ECM has a speed limiter of around 145mph and my 3rd gear wants to go even faster before I need to shift to 4th. I didn't think I'd hit the 145mph speed limiter during my dyno runs. But we did on every run. It shouldn't be an issue on the track though. Not NA. Once I spray nitrous with the 22" slicks, it may be a problem.

 

There is an old rumor that the early 02 6speed ECUs do not have the speed limit. My car was built in 12/01 and it did have it (dyno proven 149mph). Some very early build A33B owners used to claim they had no such limiters. Of course to prove this you would have to get one in original condition (not software patched or updated).

Those are sweet numbers BTW, I especially love those torque numbers.

 

+1 cuz ive been 150+ in mine.

and my build date is like 11/01

 

Gotcha. Thanks for that info.

I wonder if anybody has been able to cut the speed sensor wire in order to eliminate the speed limiter. I may get back on the dyno in the future and do some testing. Or I could get the front tires off the ground and test it that way. But I've never gone more than 40mph on jack stands before.

Thanks. Good to know.

 

Aaron, quick somewhat on topic question: You ever done pulls with and without the TC locked to compare the values?

In my experience a few years ago I am pretty sure in my car it was about 15% difference, but right now I cannot lock my TC at my power level, I want to dyno the car to make sure its not above the limit I want (550whp once I put in the bigger turbo this week), but if its unlocked im not going to be 100% sure where my actual output is at, cuz if unlocked the power is up there in the 500's then that means the actual 1:1 is way higher.

 

Yeah, I've done a ton of dyno runs with the old engine with and without the TC locked. Here is a comparison sheet I made a while back:



It shows that locking the torque converter produced 10 more ft-lbs of torque from 5-6K rpm, which is about a 5% gain. So for you, that difference may be 20-25 ft-lbs. Just a guess though.

 

got a comparo with HP as well?

 

Sorry. No I don't. But you can figure out what the HP would be at any given rpm point.

HP =Torque X RPM / 5252

 

Cool thanx for the info. I dont wanna push the hr bolts to their limit so I wanna be safe. I might just consider 15% to be safe

 

Would having a VAFC change that? I have run it up to 145mph and not hit a limiter. Never looked when my 02 was built though.

 

Here is a comparo of me and Aaron's dyno. Im the red, Aaron blue!

@ 6.8k rpm, Aarons car made 10whp more than mine. @ 7krpm it made 3 more than mine.

 

Any plan on swapping the auto trans for a manual?

 

I really doubt he will, considering auto's are far superior.

 

No I don't. But if I did swap to a 6spd, I'm sure I'd be putting down over 300whp SAE easily. And with that extra power in the 1/4 mile, I think some 11.5s would be possible NA. But for me, right now, I think the best I'll do with this setup is 11.8. I can go faster in the 1/4 mile, but it would require some extreme weight reduction (cutting spare tire well, PS removal, cut door beams, lexan windows, fiberglass panels, etc) as well as a built high compression VQ engine. According to my math, I think the fastest I could ever make the NA 92 Maxima with a reasonably priced NA engine build would be 11.0s in the 1/4 mile. And that still wouldn't be too competitive against the fastest NA Civics out there in the NSCRA sanction. Now give me a VQ Sentra and I could definitely rival those Civics that are running mid 10s NA.

Sorry for the rambling. Just chatting.

Haha! I do like being an automatic. So much easier to manage traction and I never miss a shift at the track. And once I spray a 75+ shot, it's going to be a whole different beast! I'll never be able to spray on the street with this car. Spinning the tires in the top of 2nd gear above 90mph isn't my idea of "safe".

I'm sure I would just roast the tires all the way through 2nd gear with a basic 75 shot of nitrous. Just the other day, I felt the tires break lose a tiny bit during the 2-3 shift. The roads much have had a little dirt on them. And that's all motor!

 

Its the 4sp auto correct?

Why not test the waters with the 5sp auto? I would be interested in seeing that...just need a different TCM IIRC

 

Yeah, the 5spd automatic opens up a completely different can of worms. And I haven't bothered to do any research on this topic, but I don't know if there is a standalone transmission control unit available for a 5spd auto. Now that I've used the Suprastick, I will never go back to an OEM TCM! Besides, I don't think there would be a sufficient 1/4 mile ET change with the 5spd versus 4spd.