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Thread: Need more power

  1. #1

    Default Need more power

    Looking to amp up engine power. Between hauling a loaded cargo trailer, to building materials and snow plowing, I feel there is hidden potential in this little 5.3L. Currently installed is a KN cold air intake, Gibson shorty headers, magnaflow cat back dual 2.5" exhaust, and a superchips programmer. Also have a throttle body spacer that is not installed due to the fact it pushes the intake tube into the fan blades. Outside of buying a Duramax i cannot yet afford, I am looking for some more affordable options for any further upgrades.

  2. #2

    Default

    Custom Tune from Black Bear. What size tires are you running, and what gears?
    When you hear hoofbeats, look for horses not zebras.

  3. #3

    Default

    285/75 on 16's. gearing....unsure. 4:10 maybe?

  4. #4

    Default

    Doubtful 4.10s with a half ton. Maybe 3.73, probably 3.42. Gear change would help greatly.
    When you hear hoofbeats, look for horses not zebras.

  5. #5

    Default

    Look at your RPO codes inside the glove box. Then go online and type them in, you will be able to determine what options you have, including the gear ratio. As for more power, you could go with some long-tube headers, a custom tune, and a cam. Although I have one also, the throttle body spacer does nothing other than make noise. If you aren't happy with the LT headers, tune and cam, go with a supercharger or turbo.
    2003 Silverado 2500HD 6.0L Vortec V8
    2" Body Lift
    3" Suspension Lift
    Skyjacker Hydro 7000 Shocks
    Skyjacker Steering Stabilizer
    35" Tires with 20" American Racing Rims
    Velocity Cold Air Intake
    Billet Throttle Body Spacer
    BBK Performance Headers
    MBRP Cat-Back Exhaust System
    DiabloSport Predator- Soon to be tuned by Diablew

    "Soon to be leveling-kit"

  6. #6

    Default

    will black bear give me better results over superchips? long tube headers are out, as I recently purchased the shortys within the last year. I've considered a cam but assumed the cost was to great for the return little.....am I wrong?

  7. #7

    Default

    Quote Originally Posted by jgmanchester View Post
    will black bear give me better results over superchips? long tube headers are out, as I recently purchased the shortys within the last year. I've considered a cam but assumed the cost was to great for the return little.....am I wrong?
    Blackbear Custom Tunes is one of the Site's Sponsoring Vendor's.......Below is there link to their Web Site.....there is section of Frequently Asked Questions ,that will help answer some of your Question's,

    Link,

    http://www.blackbearperformance.com/

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  8. #8

    Default

    A custom tune will always be better than a canned tune. Buy some PaceSetter long tubes for $300 and sell the shorties. Unless you go with a cam or supercharger/turbo, you are kind of at your limit for "performance mods" with the CAI, exhaust, tuner and shorties.
    2003 Silverado 2500HD 6.0L Vortec V8
    2" Body Lift
    3" Suspension Lift
    Skyjacker Hydro 7000 Shocks
    Skyjacker Steering Stabilizer
    35" Tires with 20" American Racing Rims
    Velocity Cold Air Intake
    Billet Throttle Body Spacer
    BBK Performance Headers
    MBRP Cat-Back Exhaust System
    DiabloSport Predator- Soon to be tuned by Diablew

    "Soon to be leveling-kit"

  9. #9
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    Default

    X2 on the "long tube headers" & the lower gears. Plug your vin # / RPO code in at this site to find out "exactly" what gear ratio you have www.compnine.com
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  10. #10

    Default

    what kind of performance gains would I be looking at should I do a cam upgrade....and are the performance gains significant changing from shorty headers to long tube?

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