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Thread: Car is breaking up above 6500 HELP

  1. #1
    Tuner in Training
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    Car is breaking up above 6500 HELP

    Ok Ive been chasing an issue.
    6th gen camaro
    A8 circle d converter
    forged rods and pistons
    holley hiram
    400 shot direct port
    vvt3 cam
    brisk RR08S gapped .018
    From 6500 up car breaks up Ive added fuel taken away fuel added timing took away timing. Can anyone see whats going on that I cant.
    Last edited by chase1; 11-15-2019 at 09:43 AM. Reason: redoing

  2. #2
    Tuner in Training
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    Any ideas?

  3. #3
    Advanced Tuner
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    You are way out of fuel. Your lo side drops into the 30s and you're definitely letting EOI extend way too far on the high side.

    Are you trying to pull this shot off the rail? Have you done a plug pull? 28* feels like alot on a 400 shot even on E.

    Also, it's odd that the logs show this vehicle as a 2014 camaro with a different VIN than the tune.

    75412062_425887971636967_7040037424956702720_n.png
    Last edited by sevinn; 11-15-2019 at 09:27 AM.

  4. #4
    Tuner in Training
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    I have not sprayed on those. Trying to get the stumble fixed. It has a stand alone. Car was stolen and crashed. Bought it back put motor transmission in my 2014.

  5. #5
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    Well, it's out of fuel. You need to supply more low side to it for sure and the high side might pick up.

  6. #6
    Tuner in Training
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    If I leaned it out more would it make that big of a difference for motor only? or should I go ahead and beef up the low side? Because i can obviously jet it rich for the nitrous to make up for that side of things. Thanks for the reply.

  7. #7
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    You're dropping way too much low side for leaning it out to really help. The HPFP is happiest when it's supplied about 72psi, and you're dropping to around half that in some of these logs making rail pressure drop which then increases injector MS beyond the limit of EOI
    Last edited by sevinn; 11-15-2019 at 09:58 AM. Reason: Grammar

  8. #8
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    Ok I will get that handled. Thanks for the help.

  9. #9
    Senior Tuner Ben Charles's Avatar
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    You should be on a dedicated fuel cell for you nitrous

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  10. #10
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    Quote Originally Posted by Ben Charles View Post
    You should be on a dedicated fuel cell for you nitrous
    He mentioned having one.

  11. #11
    Tuner in Training
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    Yes I have a stand alone for the nitrous. I failed the maf and that stumble up top goes away. However looking at the log the throttle isnt opening more than 74%. Put the MAF back in the equation and stumble is back and tps reads 91.7%. What can I do to make the throttle open wot when maf is failed? I also sprayed one of the runs I did with maf failed and car ran great minus tps.