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Thread: GM 8.1L predator problems

  1. 08-28-2020 #1
    Lallal
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    GM 8.1L predator problems

    I have a 2002 chevy 2500hd with the 8.1L and I just put the predator(U7198) on it with the diablo tune and now when I set the cruise at 70 mph it will all of the sudden accelerate pretty hard without me touching the gas on flat roads. It also does the same thing with the 87 octane tune in it but it doesn't do it with the factory tune. I would like to know what the problem could because it's kinda making me wonder if I want to keep the predator or not so if anyone could help me out with this it would be greatly appreciated.
    Booby from installment loans in USA
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  2. 08-29-2020 #2
    2xLS1
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    Would make more sense to contact diablosport it seems.
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  3. 09-01-2020 #3
    2500HD8.1
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    I have not used a Predator, but it could be their setting for the ETC TPS Max vs. RPM vs. % Max Available Torque table. I have a 2002 2500HD with 8.1 and if I set this table too high it will cause erratic acceleration problems similar to what your experiencing.
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