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Thread: LTFT Max Negative Value

  1. 12-21-2008 #1
    gr8vet
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    LTFT Max Negative Value

    In good engineering practice, what would be the most negative value LTFT one would run? i.e. is -10 to -4 acceptable?

    ((The issue, friend extremely anxious to get car back, after tuned to a very nice level of fuel and spark, LTFT's running -3 to 0, I added 10% fuel across the board knowing he is going to run the hell out of it. Twin turbos at 6 psi.))

    thanks

    tt
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  2. 12-22-2008 #2
    pdsq98gt
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    Did you tune WOT with a wideband? -3% LTFT is fine for cruise and idle.
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  3. 12-24-2008 #3
    gr8vet
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    Yes, tuned all via WB; VE, MAF, PE. Street tune only no dyno yet, that was my concern in case he happens to hit on some cell / area that I did not tweak. Otherwise the tune was at -3 to 0 on LTFT's and running a nice 11-12 AFR WOT. I added 10% to VE table, crap, not sure why now, guess to sleep better at nite.

    thanks

    tt
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