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Thread: Won’t build boost on 2-Step.

  1. #1

    Default Won’t build boost on 2-Step.

    I've search a bunch of posts before writing this. I’m using CO2 when on transbrake and 2-Step, it will only build 1.5-2 psi. I have a 4 lb spring in wastegate and have 6 lbs on top of wastegate, never goes higher than 2 lbs. I’ve tried an Advanced ICF Table take 10° out @ anywhere from 3200-3600, still doesn’t change any ideas on what to do? Combo is a LS 408 88/102 bar Stage 3 cam and a 4L80E with 3600-3800 stall.

  2. #2
    Join Date
    Jan 2010
    Brisbane, Australia


    More fuel, less timing. You need more combustion, including still burning before the turbine, to spool the turbo. While your engine is limiting, it's like a small engine with a big turbo. Gary

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