What's the most beneficial A/F ratio?
 

I dyno tuned today, got 204.56 WHP 210.03 WTQ, '97 Auto with VQ35, numbers are uncorrected, correected they are 199.xx WHP, 205.xx WTQ. My A/F ratio seems to be between 12.2-12.5 a hair below 13, I got the files e mailed to me but need the software to upload the files. I'm asking about the A/F R. because after driving 150 miles or so I got a code, 0210, left bank fuel inj system: lean.

Between 4400-4800 RPMS the AFR is exactly at 12.0.

Send me the run files.
bizzy1999@hotmail.com


When you say corrected, do you mean SAE or STD?

12.0 is rich for N/A...

This is debatable, but 13.5:1 would be well.
Depends on what you're doing. (autox drag :russ: )
A straight as possible line is said to be crucial in these VQ35's.

Where's peak power?

Send me files please :ben:

I kept mine at 13.4-13.8. Going a little further lean will probably not be worth the little amount of power gained, over the higher risk of knock.
http://i32.photobucket.com/albums/d4...Dyno-Tuned.jpg
EDIT= BTW, this is on the VQ30DE, not 3.5

Is it safe to have an A/F Ratio between 12.0-12.5?

Sure is, my AFR was 11.8:1(for months) before I tuned it

If you read the Z forums at all you will see that the most HP they have achieved has been with a 12.0-12.3 a/f. Last year I had mine at 12.5 for most of the season.

how do you ajust the A/F, and how would you know where you are. (unless you are at the dyno)

You adjust the a/f with an S-AFC, Emanage Ultimate etc.

You know where you are by taking the readings with a wideband.

My car was never on a dyno.

What other modifications do you have? :mad: I dyno'd much lower than you did with my VQ35. My hp & tq seem to be about 20 less than yours. I have been racking my brain ever since my dyno to figure this out.

You're almost identical 6200+ SAE.

Say what? I dyno'd 184/196.

i'm not familiar with tuning, although i'm very interested. i was wondering if anyone could give me any information or point me in the right direction to find out how a/f ratio and other things that we can tweak will be beneficial.
it just doenst seem like many people are actually "tuning" i want to go further than just the bolt ons.
im not familiar with the s-afc and emanage. but i hear about them alot. and the obd-11.

so sorry!!!!

i dont know what happened, so many reposts.

man...glitchy system.