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Thread: more power

  1. #1
    Join Date
    Jul 2011
    Location
    Ontario
    Posts
    26

    Default more power

    i would like to get some more power out of the old girl, i have read up on ecm reflashes and proformence chips but is there any way to get more fuel flow with out the computer controlling it ie ramp the pressure in the system some how? shim the governer springs? any ideas that you guys have tryed would be great

    thanks again

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

    Default

    What truck do you have? No info, we can't help.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Jul 2011
    Location
    Ontario
    Posts
    26

    Default

    2000 6.5 400xxx kms with a 4" exhaust from the down pipe back to the front of the bed which goes to a 7" stack, the turbo is held open with a home made wastegase and the factory air cleaner was replaced with k&n

  4. #4
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

    Default

    You have an electronically controlled injector pump, the only way to make it inject more fuel is to re-flash the ECM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  5. #5
    Join Date
    Jul 2011
    Location
    Ontario
    Posts
    26

    Default

    could i up the signal voltage to a certin sensor to allow it to put more fuel in? would changing the govener springs in the injection pump make a diffrence?

  6. #6
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

    Default

    No, the Ecm controls it. As far as I know, there is no governor in there. The ECM supplies a timed pulse to open the fuel solenoid, and that is what controls the amount of fuel injected. The ECM receives a signal so it limits the revs, unlike the mechanical IP that has an internal governor. I have one truck with a mechanical IP, and it is turned up to inject more fuel and the governor tentioned up to rev high enough in 3rd gear to wind the speedo off the end, but the electronic one only has a #9 resistor to give it a bit more power, no more without an ECM re flash.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  7. #7
    Join Date
    Nov 2007
    Location
    nor-cal
    Posts
    75

    Default

    One thing I would like to add Geoffrey, your engine has almost half a million miles on it, we're not running big rig motors like a cat or cummins designed to go a million miles before a major rebuild, pushing any passenger vehicle or light truck motor, at the age and mileage yours is at is, in my humble opinion, a very bad idea, and should at this point in its life be treated with kid gloves a bit, unless you've over-hauled the entire thing.
    Last edited by k3500man; 10-20-2012 at 07:03 PM. Reason: bad spelling/grammar
    Kevin K. Nor-Cal Redneck
    '98 Chevy K3500 Dually Cowboy Cadilliac,VIN "F" L65 6.5TD, , 2" body lift, FSD Heat Sync, FLIGHT SYSTEMS upgraded D-TECH PMD,#9 pmd resistor, 6' extension harness, home-made redneck intake,3" stright stainles exaust with faux cat, upgraded and rebuilt 4l80eod,4.11 posi, 13-15 mpg at 55-60mph. Other goodies, Cobra 25-LX Cb radio with 8 foot whip, Rawson-Koenig Steel Tool box.

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