Quote:
Originally Posted by Michael Beard
FAST XFI. Currently running in Alpha-N, closed loop, Target A/F at 12.5. Got it to 13.3 on Run #3 of the weekend at MIR, and it wouldn't get out of it's own way.
Question is, is 13.3 to 13.2 a big jump, is 13.3 to 13.0 a big jump, or is 13.3 to 12.5 a big jump? How much is 1,000' DA change likely to affect the A/F ratio (ballpark)?
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Subtract 8% at the RPM that is 13.3 to get 12.5. Some guys have 1000' tunes, 2000' tunes, etc. Many simply adjust fuel pressure. 1 to 2 psi per 1000' is pretty common.