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Title: KRKTE changed but Fueltrims dont seem to fall Post by: Jim_Coupe on March 22, 2016, 06:06:52 AM I have changed my KRKTE (0.03907) and TVUB to fit my 1000cc injectors and longterm fueltrims added around 10% extra on idle and part throttle. So i increased KRKTE to 0.04000 and still fueltrims add around 10 - 12% extra adjustment in the same area.. Att WOT and 500rpm fueltrims are 0.3%..
Anyone who know what can be done? Do i need to adjust mor on the KRKTE and adjust TVUB some? I cant post logs logger dont work on my ECU.. Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: Jim_Coupe on March 22, 2016, 06:08:54 AM Here is a plot I made of my Bank1 long term fueltrim.. its LOAD vs RPM = %
Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: aef on March 22, 2016, 06:19:36 AM What about FKKVS?
Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: Jim_Coupe on March 22, 2016, 07:02:06 AM Good point.. I could do some adjustments there.. I was abit unsure what table that is actual in this case. I can lower some areas in that table now that i have a plot on it..
Just a thought: If my fueltrims are adding 10% extra in some areas in this plot.. Is it possible to just subtract 10% from the FKKVS table? Or is that just a theoretical dream? Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: nyet on March 22, 2016, 11:42:21 AM FKKVS is really not the place to fix very basic fueling problems.
Something else is amiss here. I'd guess you don't have enough KRKTE, AND you have to cut TEMIN if you are rich idle but looking good in part. However, your KRKTE really should be close to theoretical calculated, in which case I'm guessing your MAF curve is still wrong. If, however, your long term trims are all near zero, and you are only seeing short term trim issues, then yes, you can play with FKKVS... but if your fuel system is right (linear - fuel pump good, TVUB good, FPR good etc), that just means you are measuring load wrong, and using FKKVS to patch over the problem... which means your MAF is still reading wrong in some load areas. Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: aef on March 23, 2016, 12:09:16 AM Set your FKKVS to all 1's if you plugged in new injectors.
MAF and related maps are untouched? Maybe post your old KRKTE and your calculation. What ecu/car are we talking about? Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: Jim_Coupe on March 23, 2016, 04:53:28 AM My FKKVS was 1.0 all over (I enterd 1 manually my self) when i got the 12.5% extra add.. So yesterday i raised the FKKVS in some areas with 10% and it worked.. I just have to fine tune some areas now.. Gonna run some more test to se if this was true or if it was just ocationally. :)
Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: nyet on March 23, 2016, 09:48:08 AM You really shouldn't be using fkvvs for that. It hides MAF issues.
Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: DT on March 23, 2016, 12:06:54 PM MAF and related maps are untouched? Promaf if I recall. Mapped by a Stockholm tuner. Unknown which it is.Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: nyet on March 23, 2016, 12:16:54 PM MLHFM, KFKHFM or both?
Title: Re: KRKTE changed but Fueltrims dont seem to fall Post by: Jim_Coupe on March 23, 2016, 04:02:24 PM Nyet that was exactly what I was thinking.. Due to heavy modified intake..
If i look into some S4 tunes i se 1.0 in FKKVS overall.... And KFKHFM are more edited in those tunes. anyway.. I changed FKKVS and managed to get +- 3% in my fueltrims.. But im abit suspicious.. My intake is the hardware that i have modified most.... DT its not a stockholm tune anymore.. im doing my own now.. V8 MAF sensor.. |