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Thread: Truck preparation for track!

  1. #1
    Join Date
    Apr 2011
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    Temple, Tx
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    Truck preparation for track!

    Hey guys, I'm about to hit the track with actual slicks FINALLY, lol. As I understand it I'm going from a 275/45/20 which is 29.7ish tall. I got some 28" Hoosiers for it. When I change the diameter in HPTuners will it bounce off the rev limiter before shifting or even shift at all? What do you do to prevent that? I'm pretty f n lost when it comes to hp!
    Last edited by BlownChevy254; 10-28-2012 at 06:48 PM.
    2002 CAMARO SS - sold
    2006 SILVERADO 5.3 :: CREW CAB :: CAI :: HPTUNERS :: 26'S
    2000 SILVERADO RCSB 5.3 :: PROCHARGED 11#'s :: 8.1 44# MARINE INJECTORS :: SS LT'S :: COMP CAMS 212/218 114 LSA :: 06 EFANS :: TRUETRAC :: 4.10s :: P&P THROTTLE BODY :: WALBRO 255 :: WHEATLEY TUNED :: 2/4 DROP
    Buying things I dont need, to impress people I dont know!

  2. #2
    Join Date
    Jan 2008
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    1,560
    It shifts based on rpm and/or mph. Best thing to do it change the tire height on hptuners. Should take 2 minutes including flashing

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  3. #3
    Join Date
    Apr 2011
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    Temple, Tx
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    Quote Originally Posted by o2camaross View Post
    It shifts based on rpm and/or mph. Best thing to do it change the tire height on hptuners. Should take 2 minutes including flashing
    Is it just me or after every flash it takes about 100ish miles to learn the changes???? Seems like it always bounces the rev limiter. Anyone else see this??

  4. #4
    Join Date
    Sep 2008
    Location
    Arizona/Utah
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    3,955
    You can always zero out the mph tables and just do it based on rpm. I have never had issues with it taking any time to figure out the shifts, but I don't beat on my truck too hard.
    ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06

    waiting to go in... 3.90s, 214/220cam

  5. #5
    Join Date
    Jan 2008
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    ^ try that maybe

    04 RCSB 5.3, Homemade 80mm FM, TU1, TH400

  6. #6
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    if the engine is bouncing off the rev limiter:

    - shifts are too close to rev limiter, shifts too high; rev limiter too low.
    - trans slipping
    - tire and gear size ain't correct, which is the same as the first issue

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