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Thread: cuts out in high boost

  1. #1

    cuts out in high boost

    took truck out saturday night, made a test pass on 10#. was gonna race someone so i turned boost controller up. ended up not racing and leaving. on way home i decided to see how it would do on higher boost on hwy. hit 21# and it was cutting out. did it twice just to monitor data better in boost. dont see anything out of ordinary. still working on tune so i know its not perfect
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  2. #2
    don't see any signs of knock or fuel issue.

  3. #3
    Tuning Addict
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    21psi is a pretty decent amount of boost if I read that right... Make sure using really good plugs gapped right around .028" max... Good coils are needed at that point too... This is all if it's misfiring due to spark blow out...
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  4. #4
    yea plugs are gapped at .025 br73f plugs
    build is all new but runs good 10-11 #
    will take it out again soon n see. gonna pull plugs tomorrow for inspection

  5. #5
    Senior Tuner SultanHassanMasTuning's Avatar
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    i would get that ve tuned right and check your fuel pressure at those boost levels
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  6. #6
    ve was richer than I had it commanded. if it was a fuel issue wb would show lean . commanded vs actual wasn't that far off

  7. #7
    Senior Tuner SultanHassanMasTuning's Avatar
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    can you do some logs of the car

    say 10# 13# 15# 18#


    so you can slowly figure out whats going on.

    hows your head studs like? headlift? HG?
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  8. #8
    yea will get some logs. have some at 10# will post n few. yes have head studs dobut head lifted runs good on 10# and out of boost. may take it out tomorrow for some more data

    10# run log in first post along with 20# pull on way home
    Last edited by prostreet1967; 11-02-2016 at 06:13 PM.

  9. #9
    test cut out.hpl
    test pass i made on lower boost still cutting out. running both pumps all the time holley 12-1800 straight 93 no meth

  10. #10
    Screenshot (166).png
    would this cause issue if i make more than 640 on higher boost?

  11. #11
    Senior Tuner SultanHassanMasTuning's Avatar
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    ^ nothing to do with it
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  12. #12
    did pull on higher boost on highway and it was reading 10.0 figured it was pegging gauge. pulled fuel in higher boost levels. it's no longer sputtering is now reading high 10s in boost. broke differential on last hit.

  13. #13
    Senior Tuner SultanHassanMasTuning's Avatar
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    ^ sounds like its all good now
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  14. #14
    yea still a little rich was at 10.6 commanded 11.5. what's weird to me is from want I've heard after 100 kpa ve cells should be close to 100 and go up from there. my cells are 60s n 70s and still needs some pulled.
    another weird thing I have my ve pretty dang close 10-14# which is about the same number on ve at the 18# and it's showing rich. so 10-14 # is 60s-70s on ve and good less than 5% difference and 60s-70s on 18# is rich 19% different

  15. #15
    still not sure why my ve table n boost is has 60-70s n cells and is still rich

  16. #16
    Tuning Addict
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    Boost referenced regulator, meth? Post the latest tune - it may be something in injector settings too.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  17. #17
    will do tonight. is aeromotive boost reference regulator with 58 psi Base pressure. no meth

  18. #18
    my ve up to 270 kpa is 70s on ve table im lost as to why other cars ive helped tune are beyond 100 in boost

  19. #19