A/F Ratios
 

When you guys are dyno tuning, what kind of A/F ratios are you shooting for? I'm used to tuning DSM's, so we usually shoot for around 12.5:1 - or around 0.90V on the Jumptronix. So, on a naturally-aspirated Honda/Acura, do you shoot for around 14.0:1 - around 0.75V or even leaner?

Also, are you guys dynoing in third or fourth gear?

Thanks a lot!

Re: A/F Ratios (coquinn)
 

On turbo cars I use the air fuel ratio to keep things safe and rich.
With NA cars it doesnt really matter too much as long as its not dead lean.
I jsut do what makes more power. if a motor likes it a little rich/lean then
so be it.

Re: A/F Ratios (sgT)
 

Yea, I agree with sgT...I just shoot for whatever the motor likes. Mine seems to like 12.0-12.5:1 and its all motor.

Re: A/F Ratios (coquinn)
 

So on a NA B16 is 13.5-14.0 to lean?? I have been told 12.5-13.0 is what a person should shoot for but I'm around 14.0-14.7 most of the time. Yoshio at in Toronto tuned my car but I'm wondering if he leaned things out too much.

Re: A/F Ratios (MadtownSi)
 

only way to tell is to add fuel and see if you make more power.

Re: A/F Ratios (sgT)
 

Here is my friend's B20VTEC after we tuned the A/F Ratio. We could not make it any richer at 6000 for some reason. He is using a Skunk2 chip

http://www.orbit3d.com/view.phtml?id=503.jpg

Blue = 40 PSI fuel / 0 settings on VAFC
RED = 50 PSI VAFC change - 55k-65k=+10% 65k-8k= +5

Re: A/F Ratios (sgT)
 

.....also check your plugs. http://images.zeroforum.com/smile/emsmile.gif