mykim72

what ratio is dangerous? my wideband sensor says i run lean sometimes and i wonder at what point im in trouble? 16:1? i dont know where to set my wideband gauge alarm at?

mykim72

nevermind...driving out of boost it goes lean

mygt500

If you have TT's I would set the max A/F ratio at 12 and no higher.....11.3-11.7 is more ideal at WOT with FI and at idle 14.7 is normal. what was the A/F ratio while on the dyno? You have it dyno tuned right? Or is it a canned/emailed tune?

I managed to get a pic to show in your sig too. I had to resize it as well because the limit is 500 x 250 max!!!!! No infraction given as it was just text before.(links were all wrong) Welcome to the forum and the boosted club!

moosestang

I like my fat whipple tune, 10.8:1 for the win! Like mygt500 said, anything much over 12:1 is pushing it on a FI motor, but if you want to make max power, then that's what you got to do.

Jersey Stang

help! you guys just confused me! numerical reading above 14.7 is lean, right? which means there is more air than needed (20:1 is extremely lean). under 14.7 is rich...the engine has more fuel than needed. and an FI motor should run rich with a ratio of 12.1 or lower? I think I need an AF ratio guide for dummies....

graygt07

jersey stang you are correct. at WOT i run 11.7

mykim72

thanks my gt500! i wasent too sure how to make the sig, and i just finished installing the gauge, i messed around with it more late last night and at the time i had not gone into boost. i had my car tuned and at WOT i was at 12.0

mygt500

jersey you have a good grasp of the ratios. I was speaking for WOT runs and the 14.7 is for idle whether boosted or not.
I run at WOT about 11.4-11.6 give or take. My first tune was pig rich at 10.9 and that IMO for my motor was just not good for driveability when cold...so the retune yielded more HP and a better A/F ratio!

mykim72- What boost you running? I still think 12.0 is the max and I am no expert with turbos.... I understand the "how" it works and the slightly leaner tune accts for more HP but with less room for error.... JMO

zkiller

I hope you are only concerned about that ratio at wide open throttle. At partial throttle that reading is fine.

mykim72

ill check it again, but my girlfriend said it read 12.0 when i was at WOT...but i didnt see it myself, we were on the freeway and caught up to a CHP cop and slowed down...im running at 6~6.5 psi right now