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Thread: Cant Find the Problem E38 2 BAR SD

  1. #1

    Cant Find the Problem E38 2 BAR SD

    Cant seem to find the problem of why my truck seems to be cutting out as soon as it gets into boost. Almost sounds like it will physically not let it go past a certain point of boost and im only talking about 3.5 lbs. Feels like its pulling fuel/timing or something but nothing looks like it is in the log. Can someone look at my log and tune and see if they notice anything strange. Fells like its missing in a sense but no misfire counts and all plugs are new as well as wires. This is a twin turbo silverado E38 COS 2 bar . Any help would be appreciated i cant seem to figure out whats going on unless its something mechanical which everything is stable. Fuel pressure etc.
    11-25-16 COS.hpt
    1-8-17(2).hpl
    1-8-17(badrun).hpl
    2007 CHEVY ECSB 5.3L with EPS 224/230, .609/.610 lift on a 111+2 LSA. Pacestter LTs with full true dual exhaust, CAI, CIRCLE D 3600 stall, 4.10s with tru tracs.

  2. #2
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    You're bottoming out that wideband going as rich as it will read... that's likely the problem. Pull 10% fuel out at least, could probably do 15%. It's going to 0.68 lambda when you're commanding like 0.81 lambda... 0.68 is the lowest that model can even read.. so you are likely even richer than that

    Also I wouldn't max out that knock decay rate unless you don't want the knock sensors to do anything
    Last edited by schpenxel; 01-12-2017 at 10:50 AM.
    Post a log and tune if you want help

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  3. #3
    Advanced Tuner NJ_Phil's Avatar
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    Not sure how long you've been running it that rich but keep an eye out for oil/fuel contamination. Ran my setup super rich while tuning for a few days and wound up with an "extra" pint in the crankcase. not a good thing
    2012 C6 Base, Kooks 1-7/8" LT, Catted, NPP
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