Thread: best upgrades for 2006 GXP ?

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  1. #16 Re: best upgrades for 2006 GXP ? 
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    I posted this on LS1Tech, and I thought it might be good here too. The LQE/LM4 is basically a GEN III version of our engine, in that they are both all aluminum, 325ci, and have good stock heads. They were running dyno headers in the test too, and they went with Comp 918s once they upped the cam.

    Stock LQE (300HP, 9.45:1 All Aluminum 5.3L used in the SSR):
    Intake: Stock Truck
    Heads: Stock (1.89 intake, 1.55 exhaust)
    Cam: Stock (190/190, 114LSA, .456"/.464")
    HP: 323@5200
    TRQ: 355@4000
    TRQ @2000RPM: 318
    Vacuum: probably about 24" of mercury at idle

    LQE with LPE GT2-3
    Intake: Stock Truck
    Heads: Stock (1.89 intake, 1.55 exhaust)
    Cam: GT2-3 (206/220, 118.5LSA, .571"/.578")
    HP: 378@6000
    TRQ: 366@4800
    TRQ @2000RPM: 308 (less than stock until 3300RPM)
    Vacuum: 20.7" of mercury at idle

    LQE with LPE GT1-1
    Intake: Stock
    Heads: Stock
    Cam: GT1-1 (229/242, 114.5LSA, .631"/.631")
    HP: 413@6600
    TRQ: 369@4800
    TRQ @2000RPM: 281 (less than stock until 4300RPM)
    Vacuum: 10" of mercury at idle

    LQE with LPE GT1-1, LSX Intake, Ported Heads
    Intake: Comp Cams LSX
    Heads: Ported Stockers (2.00 intake, 1.55 exhaust, bump to 10:1 compression)
    Cam: GT1-1 (229/242, 114.5LSA, .631"/.631")
    HP: 458@6600
    TRQ: 392@5800
    TRQ @2000RPM: 294 (less than stock until 3200RPM)
    Vacuum: probably still 10" of mercury at idle


    Notice when the compression comes up and the intake/heads match the cam, you pick up a lot of the midrange that was lost when just the cam was just a bit too big.

    Here's a link to the second article in the series. You can read about them upgrading the injectors to match the big cam/intake too:
    http://www.carcraft.com/techarticles...ine/index.html
    Last edited by nmp0098; 05-04-2010 at 02:44 PM.
    2007 GXP, CAI Intake, 85mm MAF, LS6 Intake Manifold, 42# LS3 Injectors, PRC Ported and Milled 243 Heads - 11:1, 224/232-113+5 Comp Cam, PAC 1218 Springs, DT Headers (w/Custom Crossover Pipe), Cutout and Maxflows, TEP Transmission (3.29s), HP Tuned by Me, Pioneer Speakers and MTX Subs, 13.1 @ 108.7 on street tires at full weight.
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