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Title: Dialing in a new MAF housing Post by: 16g-95gsc on April 14, 2013, 06:39:48 AM So there are two maps that directly correlate to MAF housing changes:
MLHFM, a general map for dictating a particular sensor/housing combination KFKHFM, a map for dialing in the fine tuning of a particular intake tracts influence on the MAF readings at various load/rpm points This I fully understand. What I would like to know however is how you go about extracting the basic MLHFM information when first setting up a new MAF housing without letting your (at this point) untuned KFKHFM map also influence your STFT/LTFT feedback. For an example, I am using my car, keeping the injection system stock so as to isolate any fuel map influences on STFT/LTFT, and swapping in a 034 billet MAF housing with hitachi sensor. You keep the stock hitachi MAF signal curve, and just scale it by some constant % offset based on the new housing size, and use feedback from STFT/LTFT to tweak the percentage change. However, since KFKHFM has not been adjusted yet for my intake setup, how can I ensure that the feedback I am using isn't in some way manipulated by this untuned map? Title: Re: Dialing in a new MAF housing Post by: ddillenger on April 14, 2013, 08:32:10 AM Set kfkhfm to all 1's, then scale your maf.
Title: Re: Dialing in a new MAF housing Post by: 16g-95gsc on April 14, 2013, 10:41:11 AM How close to zero should your LTFTs be when dialing in the MAF housing on stock fueling/fuel maps? My first attempt at flashing yielded around -5 on bank 1 and -8 on bank 2 at idle and roughly -3 or so at part cruise.
Title: Re: Dialing in a new MAF housing Post by: catbed on April 14, 2013, 12:26:58 PM Turn off LTFTs while you dial in the MAF?
Title: Re: Dialing in a new MAF housing Post by: 16g-95gsc on April 14, 2013, 12:35:27 PM Excuse me if I'm new, but I tried that by firing up VCDS, then going into the engine module, and then basic settings, and the 099. Literally all of this is new to me, but I don't see anywhere that I can turn LTFTs off? I'm sure I'm way off on something here.
Title: Re: Dialing in a new MAF housing Post by: catbed on April 14, 2013, 01:06:36 PM Excuse me if I'm new, but I tried that by firing up VCDS, then going into the engine module, and then basic settings, and the 099. Literally all of this is new to me, but I don't see anywhere that I can turn LTFTs off? I'm sure I'm way off on something here. Switch to basic settings in the bottom left. IIRC, there is another way to do it. NOLRA -> 5 perhaps? Title: Re: Dialing in a new MAF housing Post by: phila_dot on April 14, 2013, 06:17:21 PM I suggest that you get your injectors dialed in on stock MAF/intake first.
Title: Re: Dialing in a new MAF housing Post by: ddillenger on April 14, 2013, 06:27:26 PM I suggest that you get your injectors dialed in on stock MAF/intake first. This. Injectors are easy. Once fueling is good with the stock maf, switch the housings and try to get everything back to where it was. Title: Re: Dialing in a new MAF housing Post by: Mantis on April 14, 2013, 07:11:30 PM I will 2nd or 3rd the motion of dialing in your injectors first on a stock intake/maf. I tried to do both injectors and maf and it drove me crazy. Went back to just getting the injectors settled and it made life simple when I started dialing in my maf
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