Quote:
Originally Posted by Denny McLain
Very interesting concept however an issue I see is the factory fuel curve is not linear. The same progression on every wideband readout I've seen. The cars are leaner at lower rpm getting progressively richer at higher rpm's.
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Doesn't seem to be an issue. At WOT (open loop) the fueling is all handled by built in Maps and not the MAF and O2 anyway. Since every plot I've seen here even with mods seems to be a bit rich, more air from the slightly larger MAF (2.41"ID up from 2.33"ID) simply creates a parallel A/F plot slightly leaner. The car runs like a bear under all conditions though i will do a Dyno at some point to confirm..BTW, I suspect this is one of the factors that accounts for some CAI's making the power gains they are..
I've been building larger MAF tubes for Audi Turbo's for 7-8 years now and tuning to long term trims. 400 out there and we haven't blown one up yet!
Prior to the Mods the Long term trims would show a -15% correction (rich). Going to WOT these corrections are added to the built in maps resulting in a relatively fat A/F which the plots I've seen verify. Starting with Zero correction, the WOT maps are not modified from their original tune, car runs a bit leaner, and makes more power. Works for me anyway..
