Explanation of fuel trims HERE!

[Turbocruiser13]

Thanks for the quick response blackbird. My wideband was calibrated just a few weeks ago and has only seen roughly 300 miles since then. I don't necessarily think it's a calibration issue considering it still reads 14.7 at idle. I suppose as long as it's still getting good mileage (which I'm trying to work now now...kinda hard with 400 hp at the push of a pedal lol) then it's fine with me. As soon as I can borrow a scangauge that should tell the whole story right there I'd imagine.

[racedude1984]

now when I'm cruising at 65-70 I see long trim of -8.5--7.5. When I let off the trottle it goes all the way to -32--35 is this normal. my afr will be 14.7 area while cruising. But once I let off the throttle the afr will go to low 12's -mid 11's for about a sec then see 20 afr. Is this normal?

[05commemorative88]

-6.5 to -7.5 long term trims are not bad at all on the factory tuned ecu.............

and when you let off of the throttle your trims will screw up some, your computer cannot calibrate fuel delivery that quickly. how are your short term tirms???

[racedude1984]

short trims seem ok IMO bounse from -3 to +3 constantly. BTW I'm running stage 1 computer, 750 rc injectors, return line, fuel pressure set at 40 psi with 21 psi of boost.

[05commemorative88]

that means that totally your fuel trims are anywhere from -11.5 to -4.5 which is not to shabby. i would try to subtract some fuel to get them a little closer to 0 but they are not to bad at all.

[quickshift]

what would cause my ltft's to be -19/-23 at 40psi w/ 750dw's?????