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Thread: GTP with 3.29 gear tuning help...

  1. #21
    Senior Tuner Russ K's Avatar
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    Dec 2005
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    The 1.121 value won't change, and I said to leave the tire size field at the stock value. I didn't say to change it, as you never use the advertised or measured tire dia because of the difference in the loaded radius.

    Russ Kemp

  2. #22
    Tuner in Training
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    May 2005
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    Halifax, NS
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    Quote Originally Posted by Russ K View Post
    The 1.121 value won't change, and I said to leave the tire size field at the stock value. I didn't say to change it, as you never use the advertised or measured tire dia because of the difference in the loaded radius.

    Russ Kemp
    I haven't done anything yet. I was unsure what stock value was for this car, and the only values I had were based on tire size calculator. I hear what you're saying about load radius differential. I'll dig back and find out what the stock number was, and see if it's actually the number I have currently.

    Thanks Russ!

    Ross
    MP112 conversion.

    2000' Grand Prix GTP

  3. #23
    Tuner in Training
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    May 2005
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    Stock value 25.82", which was what was I had originally. Good.
    MP112 conversion.

    2000' Grand Prix GTP

  4. #24
    Tuner in Training
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    May 2005
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    Halifax, NS
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    Hey Russ.

    Flashed the new tune with just the ratio change. No DTC's, and Calculated 3rd gear ratio is 1:1. Attached is datalog.

    Shifts were smooth and soft as they should. Trans had been rebuilt, and apparently been in Limp Mode for quite sometime now, and I thought the harsh shifting was actually the shift kit etc. Guess not.

    Everything seems ok on my end. Agree?
    Attached Files Attached Files
    MP112 conversion.

    2000' Grand Prix GTP

  5. #25
    Senior Tuner Russ K's Avatar
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    Dec 2005
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    The calculated gear ratio in 3rd is now 1, so looks ok to me.

    Russ Kemp