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turbo fuel maps

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Old 06-29-2004, 07:51 AM
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Car: '89 Z28tt
Engine: Dart Little M Twin Turbo
Transmission: T56
turbo fuel maps

I've been having an issue with getting drivability improved on the Z28tt, and was wondering how your fuel/timing/accel enrichment was programmed. I've already increased the MAP enrichment from 10% to 22%, and still get a lean pop on stabs of the throttle. The TPS enrichment is at 4ms asyc pulsewidth (adds 4ms of fuel to the base pulse), so I guess I should bump that up too... FWIW, the package is 399 cid, AFR210's, Pro-ram single plane intake, gale banks tt manifolds, T04e's, and 2.5" downpipes.
Old 07-01-2004, 03:05 PM
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Car: 1986 Irocz- Houstons Fastest Street
Engine: 408 LS1 w/ 2 stage
Transmission: Turbo 350
Axle/Gears: 3:73,3850 lbs , best of 9.92 @ 138
what kind of dfi? on my f.a.s.t. system it is pretty easy to tune with a dyno. what system do you have? it shouldnt be hard with some dyno time and good o'2's
Old 07-03-2004, 09:04 AM
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Car: '89 Z28tt
Engine: Dart Little M Twin Turbo
Transmission: T56
It's a DFI Gen 6. I added pulsewidth to the TPS table, and all is well now. WOT was good, so the dyno will come later when I start optimizing the timing tables at WOT.
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