What is the idael air fuel ratio???
05-04-2006, 11:36 AM
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What is the idael air fuel ratio??? I am not sure if this is the correct place to post this but I just want to know what is the best A/F for performance and normal driving? Right now I have just installed a LM-1 in my car and it is reading 14.8-15.5 at idle and part throttle and 13.8-15.2 at wot. Just want to know what is needed to get the most power out of the mods that are done to the car. BTW the car has Lt Headers and a TD exhaust with air lid and SLP ram air and intake. should the ratio be this high? Any and all help would be greatly helpful. Thank you
05-04-2006, 12:01 PM
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the pcm commands 14.68, now w/ Power Enrichment the AFR goes down to 11.0 -12.6, i have read hear on one of the stickies that ls1's develop max power at 12.8-13.0, and max torq at 12.3-12.5??? but that just what ive read
05-04-2006, 12:04 PM
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You might need to re-calibrate your WB, or use a smoothing function.
For WOT only:
Most cars like WOT to be around 13.0:1 but it depends on loading and RPM range as well.
A car that stays at high RPM with little load may like 13.5:1 or higher.
An example would be a 6-speed swap into a small lightweight vehicle like an RX7 or similar.
A more loaded vehicle with heavier weight and automatic transmission may prefer 12.8:1 or lower depending on RPM range. It seems many cars prefer to be a little richer at the torque peak and leaner after that, but that's not a rule.
For part throttle I prefer 15.5:1 and leaner, but you can't do that unless you run open-loop.
For WOT only:
Most cars like WOT to be around 13.0:1 but it depends on loading and RPM range as well.
A car that stays at high RPM with little load may like 13.5:1 or higher.
An example would be a 6-speed swap into a small lightweight vehicle like an RX7 or similar.
A more loaded vehicle with heavier weight and automatic transmission may prefer 12.8:1 or lower depending on RPM range. It seems many cars prefer to be a little richer at the torque peak and leaner after that, but that's not a rule.
For part throttle I prefer 15.5:1 and leaner, but you can't do that unless you run open-loop.
