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  1. #1
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    Default Bad hesitation under boost trying to tune LTFTs

    Hey guys, HP Tuners have MAF disabled and all trac control disabled for LTFT tuning. (3800 swapped cavalier turbocharged 15psi) So a few things here, in the editor the highest MAP reading that I have on the table is 140 KPA, scanning im getting readings as high as 200KPA on full boost and bad hesitation. It feels just like im hitting a rev limiter. Since I have the MAF disabled does the PCM just not know what to do with values over 140KPA? What are my options here? Im not "seeing" this hesitation on the scans either...
    97 cavalier with L67 swap. F23 Getrag trans with stage 3+ SPEC clutch, KB pistons, L32 rods, LS6 valve springs, 3.4 pulley, ZZP downpipe 2.5, Full rotating assembly balance.

  2. #2
    GrandPrix Junkie SgtMarshal's Avatar
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    Default Re: Bad hesitation under boost trying to tune LTFTs

    turn the maf back on and see what happens

  3. #3
    Killa Bee Scottydoggs's Avatar
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    Default Re: Bad hesitation under boost trying to tune LTFTs

    dont waste your time ve tuning a 3800. its not worth the time. plug the maf back in, tune it. be done with it.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  4. #4
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Default Re: Bad hesitation under boost trying to tune LTFTs

    Correct, the computer has no idea what is happening past 140kpa, that is the end of the fuel table.

    That is the main reason why theses cars are a MAF based operating systems. You can tune the VE up to around 2-3psi of boost then you have to tune the rest with the MAF.

    SMGPFC Member #1

  5. #5
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    Default Re: Bad hesitation under boost trying to tune LTFTs

    Thanks for the info guys. I'll try that out. Slowly learning this tuning thing 😀

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