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Thread: A4 Transmission launching in 1st ????

  1. #1
    Tuner in Training
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    A4 Transmission launching in 1st ????

    It seems that my A4 tranny is launching in second gear at the track. Is this something that is controlled by the computer. Can HP Tuners help something like this? I know this is done, but can you tune the tranny to launch differently? 3800 Stall. Just wondering if anyone has experienced this. Bigger tires than what is in tune affect this?
    Thanks

  2. #2
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    Re: A4 Transmission launching in 1st ????

    If your shift MPH is crazy low, maybe the converter is
    allowing shift RPM to be satisfied very early. If you
    are "easing into it" with only a part-throttle foot-stall
    then your part-throttle shift tables may be to blame,
    you have the RPM to force an upshift and the speed
    to upshift, at low TPS, can easily be met in the stock
    (lame-o) part throttle tables with just a little wheelspin.
    With the big STR (2.6?) and high slip you are probably
    only 15-20% TPS tops at your foot-stall spin threshold.
    That puts you at a pretty low stock upshift MPH.

  3. #3
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    Re: A4 Transmission launching in 1st ????

    doesnt both the MPH, and Rpm limits have to be met before a transmission will shift?
    My second to third shift seems to hang, which feels as if it hits the rev limiter, and I found the current tune has my RPM WOT shift at 70, 6342.


  4. #4
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    Re: A4 Transmission launching in 1st ????

    For WOT shifting you have to meet RPM and MPH.

    But if you do not have your TPS% > 94% (stock
    threshold) you are not shifting from the WOT
    table, but from the part throttle tables, and those
    are MPH vs TPS, forget RPM, and wheelspin makes
    MPH.

    So if you are trying to stall it to 3000 (say) you
    will not be in WOT, a little more pedal and spin
    the wheels while still not in WOT, and there you
    are, 2nd gear upshift.

    I would expect a 1-2 upshift at 40-41 (3.23s)
    and the 2-3 at 80-81; more like 35 and 70 for 3.73s.

  5. #5
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    Re: A4 Transmission launching in 1st ????

    Well, I figured out that my car has to be launcing in 1st. The only way that part throttle fuel tables would put you in first, is by MPH, correct. I wouldnt think it could launch in second now, because the part throttle MPH at any TPS isnt 0. Which is what the car is at during foot braking, right?

    Kinda thinking out loud here.

    I did however notice on a scan that at WOT, I changed the shift RPM way back to 5800, and brought the MPH down to 69. The thought behind that was to verify that I had a flare. SInce it meets the WOT MPH parameter, before the RPM, and still flares, leaves me with no conclusion other than I am telling it to shift, but it shifts about 6100.

    Is this correct thinking?

  6. #6
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    Re: A4 Transmission launching in 1st ????

    Quote Originally Posted by jimmyblue
    For WOT shifting you have to meet RPM and MPH.

    But if you do not have your TPS% > 94% (stock
    threshold) you are not shifting from the WOT
    table, but from the part throttle tables, and those
    are MPH vs TPS, forget RPM, and wheelspin makes
    MPH.

    So if you are trying to stall it to 3000 (say) you
    will not be in WOT, a little more pedal and spin
    the wheels while still not in WOT, and there you
    are, 2nd gear upshift.

    I would expect a 1-2 upshift at 40-41 (3.23s)
    and the 2-3 at 80-81; more like 35 and 70 for 3.73s.
    Can you clarify this please. I thought that if your foot was in the gas at 100%TPS, (launching), it goes to WOT tables??

  7. #7
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    Re: A4 Transmission launching in 1st ????

    I have a log of a run at the track, and the current bin file, if anyone wants to look at it for me.

  8. #8
    Advanced Tuner arthansen's Avatar
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    Re: A4 Transmission launching in 1st ????

    I can figure out which gear you are launching from if you send me your .bin file. I will also need to know your rear end ratio as well as what your car is (so I can find your trans ratios).

    [email protected]
    2013 Jeep Wrangler JK
    3.6 V6
    More MODs than Stock

    2018 Ram rebel
    5.7 Hemi V8
    Stock

  9. #9
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    Re: A4 Transmission launching in 1st ????

    Email sent

  10. #10
    Advanced Tuner arthansen's Avatar
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    Re: A4 Transmission launching in 1st ????

    I sent back my results. You are launching in 1st. Your MODs look pretty awsome. Work on that KR and if you need more help, let me know.
    2013 Jeep Wrangler JK
    3.6 V6
    More MODs than Stock

    2018 Ram rebel
    5.7 Hemi V8
    Stock