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Thread: DAMN! 408 dyno.

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  1. #1
    Join Date
    Jan 2009
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    The TB has stock wheels guys. Ah well....it is what it is.LOL I will accept it 4 now. When I finish my turbo LSX 440 build, I'll take time to figure this one out. As of now, to say my wife is reluctant to let me play with her TB, would be a gross understatement.LOL She took the keys and RAN!

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
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    In hot humid weather you're going to have low dyno numbers, plain and simple. Sounds like it needs a few things to wake it up, headers, cold air intake and a little rumpity rump in the valvetrain. My 408 put out just under 400 in the extreme heat on motor only and 8 degrees of timing pulled in the tune. Cool air will wake it up, make sure your intake tube is insulated and the air is pulled from outside not the superheated air from the engine compartment.

    Just noticed you have a bit of a cam in it already. You need a whole lot more duration in there, about 234 should do it.
    Last edited by RedHeartbeat; 07-18-2009 at 01:20 AM.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Oct 2008
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    Houston
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    Quote Originally Posted by RedHeartbeat View Post
    In hot humid weather you're going to have low dyno numbers, plain and simple.
    My first thought exactly.


    Dont get hung up on dyno numbers.
    They change from day to day and dyno to dyno.

    and last time I checked nobody was racing up and down the
    street with a dyno strapped under their truck either.

    If it was a "Mustang Dyno" they read lower than "Dyno-Jets" too.
    Actually give you more of a real number in my opinion too.
    2002 Tahoe 4.8 - soon to be turbo'd - SOLD
    1989 Mustang - LX Vert - 351W-TT - 2inches of dust covering it
    2012 Raptor - 497rwhp at 10psi
    If you aint breaking - you aint going fast enough

  4. #4
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    Check your coils - might have dropped a cylinder.
    67 Camaro SS 350 and a 67 Camaro back half car
    99 Z28 Camaro (Old motor - 585rwhp / 602 rwtq)
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    MD250 Mustang Dyno - EFI live

  5. #5
    Join Date
    Dec 2008
    Location
    Sherman, Texas
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    My buddies 409 with 16 pounds of boost put out 1096rwhp up at ed wrights

    02 Fully forged Iron Ls1 233/239 595/603 112lsa,
    milled, ported& polished heads,
    K&N CAI, shorty headers,
    off road x-pipe, Pypes M-80s dumped,
    TCI 3600 stall ,TransGo shift kit,
    True Trac w/3:73s, 4/6 drop,
    and a Fast LSXRT 102

  6. #6
    Join Date
    Oct 2007
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    Quote Originally Posted by Razgriz1 View Post
    My buddies 409 with 16 pounds of boost put out 1096rwhp up at ed wrights
    YouTube - My Buddy / Kid Sister
    single digit street truck


    for build info

    http://www.ls1truck.com/forums/my-ga...cs-garage.html

    The best advice I have ever heard:... Only take B( . Y . )ST advice from someone that is CURRENTLY running a turbo setup close to, or bigger than what you want......

  7. #7
    Join Date
    Jan 2009
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    Quote Originally Posted by TurboMic View Post
    LOL!!!!!!!!!!!!!

  8. #8
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    Sep 2005
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    Quote Originally Posted by TurboMic View Post
    thats so creepy
    1951 3100
    1984 C10

  9. #9
    Join Date
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    Quote Originally Posted by duckysbht View Post
    thats so creepy
    and 1 day...at band camp
    '13 silverado LT...stock

    '11 lt 4x4 z71..tvs1900

    '01 gmc twins 6.0 jakes 400 ladder bars w/ coilovers tuned by nelson performance

  10. #10
    Join Date
    May 2009
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    Jena, La
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    Don't feel bad I got 380 hp 355 torque on a 408. It has 317 heads with a little work, headers, 224 cam, 20 inch tires, 4l60 trans, 4:10 gears, approx 10.5 compression. I should have went with a smaller tire on the dyno but oh well. I am like you the numbers on the dynojet are what they are. Just going to work on track times and not worry about it. Like one of the others said you don't run with a dyno under it. The way I see some people chase numbers on a dyno and some want numbers on the track. My tuner said he make the dyno show any number I want but that is not what matters.

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