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Thread: 2003, 1500HD, LQ4 tuning help?

  1. #1

    2003, 1500HD, LQ4 tuning help?

    Hello, i have a list of parts i'm going to use and any help with a basic safe tune setup to break in the engine so later when i install a turbo after 3k to 5k miles. I know then full engine will need to be tuned again. At that time i'm gonna have a shop setup 3 tune packages.

    Parts list

    LQ4 bored .030 over - Summit racing rotating assembly 370cubic in, stock stroke of 3.622, bore 4.030, rod 6.125, 12cc dish, 9.7:1 @ 70cc (Pro LS 4340 - SUM-R2436L03012)

    Truck Norris Cam - DUR@ .050 212/22X Lift .553/.553

    Injector Bosch LS3 compact 2.0" - 12.8 Ohms, 37.5lbs/hr @43.5 PSI, 42.3lbs/hr @ 58 PSI part number by GM 12576341 (where to find injector maps to load into tune)

    TB stock 87mm Drive by wire

    Fitech intake.

    Exhaust is 1 7/8" long tube headers.

    Do i need a stronger fuel pumps now or wait until turbo kit install time.

    Here's the tune file i pulled from the stock LQ4 thats in the truck.

    Also im from the Marysville Washington area if anyone is within 50 miles and could help me with the project. i;m gonna be putting the engine in the truck this spring.

    Thank you ALL!!!
    Attached Files Attached Files

  2. #2
    Advanced Tuner
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    Dec 2019
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    MS
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    Why not go ahead and get injectors big enough for the future turbo setup?
    Might as well go ahead and put in a better fuel pump during the build so you know thats in there and ready for the turbo.