How to tune the MAF on an FL5
Posted: Mon Mar 16, 2026 8:23 am
When I tune the MAF on the FL5, should I refer to the short-term fuel trim (STFT) or the total fuel trim value?
Sorry, I didn't catch that. Did you mean looking at the difference between AF and AFCMD?Could you explain it in more detail?
Thanks, I'll give it a try.Spunkster wrote: Tue Mar 17, 2026 11:55 am You will need to look at both and make necessary adjustments to the areas that need more or less fuel.
You should use Total Fuel Trim (STFT + LTFT) as your main reference when adjusting the MAF curve.qinyuan.zou wrote: Mon Mar 16, 2026 8:23 am When I tune the MAF on the FL5, should I refer to the short-term fuel trim (STFT Geometry Dash) or the total fuel trim value?
I tried, but from the logs I found that the short-term fuel trim (STFT) for many ranges is -0.5%, long-term fuel trim (LTFT) is 0, and the total fuel trim is -1.5%. So I don’t know whether to base it on STFT or total fuel trimsoloth wrote: Wed Mar 18, 2026 11:53 pmYou should use Total Fuel Trim (STFT + LTFT) as your main reference when adjusting the MAF curve.qinyuan.zou wrote: Mon Mar 16, 2026 8:23 am When I tune the MAF on the FL5, should I refer to the short-term fuel trim (STFT Geometry Dash) or the total fuel trim value?
it sounds like your trims are already dialed in pretty well.qinyuan.zou wrote: Thu Mar 19, 2026 12:48 amI tried, but from the logs I found that the short-term fuel trim (STFT) for many ranges is -0.5%, long-term fuel trim (LTFT) is 0, and the total fuel trim is -1.5%. So I don’t know whether to base it on STFT or total fuel trimsoloth wrote: Wed Mar 18, 2026 11:53 pmYou should use Total Fuel Trim (STFT + LTFT) as your main reference when adjusting the MAF curve.qinyuan.zou wrote: Mon Mar 16, 2026 8:23 am When I tune the MAF on the FL5, should I refer to the short-term fuel trim (STFT Geometry Dash) or the total fuel trim value?