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Thread: Jumps out of gear

  1. #1
    Advanced Tuner
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    Jumps out of gear

    I have a 2005 GTO LS2 with a 4l65E that is built. I believe it has a shift kit, corvette solenoid valve, upgraded drum. I'm pretty much stock so figure 400 ft pounds of torque. The car shifts really really hard 1-2, then 2-3 starts to shift and then doesn't go in and it revs up. If I let off, it shifts, but seems like the convertor is locked then and it is slow to accelerate. It jumped out of gear in the burnout box, during the burnout, once as well. Another symptom is after I have been beating on it, when I go to shut it off there is a tire chirp like sound from the transmission.

    I'm wondering if someone could take a look at my tune and tell me if something in there could be causing it. Before I had the trans built, I halved the shift times and turned the pressures all the way up. Is it possible the mechanical shift kit plus the software is causing the issues?

    Any help much appreciated. Stock GTO A4 tune attached for comparison and my SD tune.
    Attached Files Attached Files
    www.outlawpontiacdragseries.com
    Come race with us in MA, PA, and VA!

    2005 GTO A4 - Spintech X-pipe with Powerstick mufflers, IAT relocate, Volant, !scoops, !cowlgasket, !skid plate, LM-1, HPT2.0/MPVI Pro USB, 275x40x17 Nitto DR, rolled fenders, Pedders 2985 springs, Britax baby seat with 5 point harness.
    Stock:13.36@104
    Mods in sig:[email protected]

  2. #2
    why do you have your 2 to 3 upshift at 70 and your 3 to 2 downshift at 70? It can't do both at 70mph...in your full throttle section. Also in your part throttle section, you have the 94 and 100% shift speeds at 75mph...that's higher than your full throttle shift speeds. Those need to be the same. Do you have gears? I have 3.70 rear gears and my full throttle shift speeds are way higher than yours. If your full throttle rpms are at 6400, your shift speed should be somewhere around 48..they have to be close to matching. I would add some shift timing back into the lower sections,not in the PE parts. I run a built 65e,with shift kit and upgraded drum. I'd put the shift pressures back to stock, then add about 5psi. I also went to the force tables and highlighted the whole section and lower by 5%.
    2005 gto A4
    Darton sleeved 427, prc ls3 heads, custom cam 243/257
    Fti 3400 triple disc convertor
    553/555 N/A 839/823 nitrous on hub dyno

  3. #3
    Advanced Tuner
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    Thanks so much for your feedback. I've been really frustrated with this thing.

    Would you share your tune? Are your shift times completion times less than .25? Are your pressures like mine?
    I do not have gears btw.
    www.outlawpontiacdragseries.com
    Come race with us in MA, PA, and VA!

    2005 GTO A4 - Spintech X-pipe with Powerstick mufflers, IAT relocate, Volant, !scoops, !cowlgasket, !skid plate, LM-1, HPT2.0/MPVI Pro USB, 275x40x17 Nitto DR, rolled fenders, Pedders 2985 springs, Britax baby seat with 5 point harness.
    Stock:13.36@104
    Mods in sig:[email protected]

  4. #4
    Here's mine...if it loads right. Remember...I have 3.70 gears..so you will have to do the speedo wizard to calculate for stock gears.
    Attached Files Attached Files
    2005 gto A4
    Darton sleeved 427, prc ls3 heads, custom cam 243/257
    Fti 3400 triple disc convertor
    553/555 N/A 839/823 nitrous on hub dyno

  5. #5
    Advanced Tuner
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    Nov 2005
    Location
    Someplace high in the Himalayas
    Posts
    770
    The part throttle 94 and 100 cells match the stock tune 75,75.
    www.outlawpontiacdragseries.com
    Come race with us in MA, PA, and VA!

    2005 GTO A4 - Spintech X-pipe with Powerstick mufflers, IAT relocate, Volant, !scoops, !cowlgasket, !skid plate, LM-1, HPT2.0/MPVI Pro USB, 275x40x17 Nitto DR, rolled fenders, Pedders 2985 springs, Britax baby seat with 5 point harness.
    Stock:13.36@104
    Mods in sig:[email protected]

  6. #6
    Quote Originally Posted by PurplePiss View Post
    The part throttle 94 and 100 cells match the stock tune 75,75.
    never ran a stock tune..mine was already cammed and tuned. That seems odd. Cause wot is 100%. Why have 2 different shift points for the same thing? Seems like the computer would get conflicting info.
    2005 gto A4
    Darton sleeved 427, prc ls3 heads, custom cam 243/257
    Fti 3400 triple disc convertor
    553/555 N/A 839/823 nitrous on hub dyno