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Short Term & Long Term Fuel Trims

HardiM1

New member
As the post suggest I was wondering if anyone records or checks there STFT or LTFT with a diagnostic tool?

I had a remap a while back and I was wondering if these fuel trims would show up any issues in your remap?

Does anyone know if the long term fuel trim is an average across the whole fuelling MAP, so includes all loading conditions? If so I’m guessing this would show up any fuelling or lean conditions?

Could you check it by going up through the REV range and recording the results in different gears and loads? I’m guessing this would show something up in the short term fuel trim if there was an issue? Ie reading high or low percentage?

The other question I have is around the MAF. Pre remap my MAF was at 5 g/s with a standard throttle body. I fitted an 82mm throttle body and it dropped to 4.5 g/s after install. Now I’m unsure if this was due to a small vacuum leak or the throttle body? Has anyone recorded this before? Anyway, after the remap it’s now at 5.75 g/s, would MAF scaling cause this change?

I’m not experiencing any issue but I was just trying to record some data if I experience any issues in the future, plus wanted to make sure the remap isn’t impacting the car in a big way, (I’m a nosey git)

Any input would be appreciated
 

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