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Thread: Stall Converter Trans Brake Powerglide and launch rpm

  1. #1
    Senior Member MASTER BUILDER
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    Stall Converter Trans Brake Powerglide and launch rpm

    I'm confused about stall speed, etc. Given the above, what rpm do I want the engine to be at when I launch with or without the transbrake. Thanks.

  2. #2
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    You want to launch "flash" your convertor 200 rpms over your peak torque on foot or t-brake. This alone is a good reason to put a motor on a dyno.

  3. #3
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    I wish I could do that. No dyno's anywhere near me.

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    Senior Member RACING JUNKIE
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    Need more engine info then......

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    Ok. 509 Dart BBC, 871 Blower - 10lb boost - CompCams blower grind solid roller, Profiler heads, Advanced Transmission powerglide, new converter but I don't know what the stall speed is. I can find out easy enough, I just haven't asked yet. The old one on the non-blown engine was 3800.

  6. #6
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Hey guys when he threw the blower in I don't have a clue what to suggest other than they makes tons of low end torque but I'm lost on this one. Get the cam specs and convertor specs I could help a little more.

  7. #7
    Senior Member RACING JUNKIE
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    Quote Originally Posted by jreiley
    Ok. 509 Dart BBC, 871 Blower - 10lb boost - CompCams blower grind solid roller, Profiler heads, Advanced Transmission powerglide, new converter but I don't know what the stall speed is. I can find out easy enough, I just haven't asked yet. The old one on the non-blown engine was 3800.
    Stall speed is not something you would ask anyone its something you would find out one of these ways.

    1. Have a playback tach, and when you launch the car takes off and the converter flashes, this point is called the flash stall. Also when you shift from 1-2 and the rpms drop this is called the stall recovery.

    2. You can check it by pulling the launch chip and putting it up on the transbrake and see what rpms the converter goes to. This result is not the same as the track will be though.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
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    APD Race Engines
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  8. #8
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    I am getting more and more confused. What does a stall converter do that a regular torque converter doesn't? And what is flash?

  9. #9
    Senior Member DYNO OPERATOR
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    SMASH on the brake,then start giving it gas,watch the tach,when the car tries to move remember that RPM.Then tell us :P
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  10. #10
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    I don't mean to pick or be rude, but I do have a ??. This seams to be a pretty big motor for somebody that doesn't know much about stall convertors. PLEASE don't take that wrong. I'm like everybody else and trying to figure out all the details so we can help. You're just a long ways into this to be asking this question. Again not trying to pick just trying to figure it out.


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