Quote:
Originally Posted by tomm.brz
because it has sense
and also ecutek suggests to zero it
and every other tuner does so
it is done because you don t need it and it s just annoying, yyou get to scale the maf/speed density anyway to have it perfect
why have it modified if you already have it on spot?
in ecutek they are called
Fuel trim long term maximum
Fuel trim long term minimum
put them to zero
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Thanks. Am just trying to understand it from an OEM's perspective - what I can think of is that it is done to have the AFR generally 'pushed' in the right direction of the trims so the AFR would get closer to the OL values in the table, as they would assume with different variations coming from each car.
But turning off LTFT would possibly not work well for a set-and-forget setup, ie. I would think that if the MAF sensor gets dirtier over time it would start to deviate from that perfect alignment, and LTFT will not be there to alleviate/reduce its impact of the MAF voltage drift.
Didn't see any other explanation elsewhere, so this is purely my guess.