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  1. #1
    Jr. Mechanic
    Join Date
    Nov 2011
    Location
    Central Illinois
    Posts
    129

    Default Making power with the LQ4 and EFI

    My 04 2500HD has the tried and true 300hp/360lb ft LQ4 motor. I have read many articles where guys have swapped on L92 heads, new valve train, cam and lifters and an intake with a 4bbl carb. I am looking to make more power and torque while keeping EFI in tact. The way I see it, I have two basic choices.

    Option 1: Magnaflow Supercharger. This will add about 140hp to the tune of $6000. It is a bolt on kit with everything included.
    Option 2: L92 heads, valve train, cam, lifters, intake (L76?) and programmer. I'm figuring I can make the same power as the blower for half the money.

    Does anyone know which intake will work with the L92 heads?
    How much power can I make with the factory EFI? Is 500hp/450lb ft too much to expect? At what point will I need higher flow injectors and fuel pump?

    Ideas and comments welcome!
    2012 Silverado 1500 LT 4X4
    2003 Suburban LT 2500 6.0L
    2004 2500HD Crew Cab LT 4x4 6.0L - SOLD

  2. #2

    Default

    no idea. however, you may want to look at swapping a LQ9 in. should bolt right up, makes about 350 from the factory.

    can be found in escalades.

    Alex


    2011 GMC Sierra SLE 5.3 Z71 4X4 Stealth Gray Metallic / 2004 Chevy Impala LS 3.8 Cappuccino

    Tow mirrors - Diablew Tuned - Flowmaster Regular 40 - Ready Lift 2.5' lift - BFG LT A/T K/Os - Carr Light Wing - TruckLite LED lights - Optima Red Top - 50% Front Window Tint - Line-X bedliner - Airaid MIT - Tekonsha P2 - ARS Billet Grill - Fia custom fit seat covers

  3. #3

    Default

    If you end up pursuing this, keep us posted. If you could get a before/after dyno, that would be even better. I'm genuinely curious what kind of output you could get with those mods.

    To Be Completed (Eventually):
    6" BDS Suspension lift | KingShocks Front and Rear Coil Overs | 4.56 Gears | 35" A/Ts (TBD) | Cervinis 07-12 Silverado Ram Air Hood | Fab Fours Front Winch Bumper (CS07-H2051-1) | Fab Fours Full Size Rear Bumper (CS07-W1850-1) | RX-2 Series Main Grille (Black) | Line-x Bed and wheel wells | Skid Plates | Rizor Automated Tonneau Cover | Custom Bed Insert | RBP RX-3 Series Nerf Bars | Kenwood Excelon DNX9990HD | JL Audio Stealthbox (2x500RMS) | JL Audio HD 1200/1 Class D Mono Amp | JL Audio C5-653 Components (Front) | JL Audio C5-650 Components (Rear) | JL Audio Slash v2 300/4v2 Class A/B Amp

  4. #4

    Default

    it seems as if you and I need to have us a lil chat bud. I'm basically doing the exact same thing but taking my lm7 to the lq9 spec. I've got a buddy who is putting his together right now with a Texas Speed cam kit. He also works for GM here, and we've sat down and figured up some possible setups. Im excited that someone else on here is actually trying to get power from their pickup the same was as we are!

    "If you're not living life on the edge, You're taking up too much space"

    "Truck Norris"
    - 2008 TX Edition Silverado
    - McGaughy's 4/5 Drop Kit
    - Apline Type R 10s & Amp
    - Pioneer 6 Disc Touchscreen Deck
    - Nightmare Breed Motorsports custom tune
    - Custom 3" dual exhaust through x-pipe dumped at axle
    - Airaid CAI
    - Badges and molding removed, roll pan, Truxedo roll-up cover (compliments of GMTC!), 3pc billet grille, factory fogs upgrade
    "Kristine" - 1991 Nissan 240sx
    - Cut to pieces, LS build pending

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