coquinn

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!

sgT

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.

HX_Guy

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.

MadtownSi

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.

sgT

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

HX_Guy

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



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

Black R

.....also check your plugs.