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Thread: larger throttle body tuning

  1. #11
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    Quote Originally Posted by Supercharged111 View Post
    So I never even considered this as a possibility for my TCC lockup woes in the dually. I still think it's an OS thing, or perhaps I haven't mimic'd my 1500 enough in the 3500, but probably some of my woes lie right here.
    Make sure that the road speed you log with SAE.VSS matches the speed displayed on your vehicle dash.

  2. #12
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    My throttle body is just the 454 throttle body and blade, I'm using the 350 shaft in it so the linkage hooks up like stock.

    Here's my current file. The file I posted earlier is stock except for the EGR, injectors, fan settings, and corrected speedo/shift points. This one drives better, but I still need to dial it back some more, but it's at least driveable.
    3GNEC18R8XG208839 segment swap for fans & tires-6.ctz
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  3. #13
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    Try this tune file. If it feels like it's still giving you too much air, then take a bit more out of the cracker. Also be aware that this is a spark ignition engine... the amount of spark advance in off-throttle situations will also affect how much deceleration you get.
    Attached Files Attached Files

  4. #14
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    Quote Originally Posted by statesman View Post
    Make sure that the road speed you log with SAE.VSS matches the speed displayed on your vehicle dash.
    I did set this with GPS observed speed at 70mph which is where I've calibrated my other vehicles. I figure 60-80 is where I'm most likely to get a ticket. Unless there's a way they can mismatch after a speedo cal? I'm back in log mode, will check.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

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