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Thread: How do I log torque?

  1. #1
    Tuner in Training
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    How do I log torque?

    I would like to log my torque to help with adjusting some of the shift tables based on torque. I also would like to know what kind of torque I am getting out of the car at high end. If the engine is using torque readings how do I get them to show up on the scanner?

  2. #2
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    there are torque PIDS, one for engine and one for trans. I think they're calculated based on load and values for a stock stall, so if you dont have a stock stall you're gonna be off.

    i like to use dynamic cylinder air for a torque measurement. amount of air in cylinder determines compression, and compression determines torque, thus dyncylair is a good relative indicator.

  3. #3
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    I can't find any torque PID's for the Vortec 4200 LL8 I6 in the Saab 9-7X 4.2i. Any ideas where to find them?

  4. #4
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    There is a PID for my '04 4.2L named GM.TRQENG_B that logs engine torque delivered to the engine. My max value is 112 ft-lbs. I posted a message about this in the I6 engine tuning section. If you get your PID to work, I'd like to know what your max value is.

    DS

  5. #5
    Advanced Tuner gman4dx266's Avatar
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    Ive seen 334ft. lb. on my stock v6. So, sure id like to know how to get something accurate too.

  6. #6
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    Bill@HPTuners's Avatar
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    Quote Originally Posted by uelundgren
    I can't find any torque PID's for the Vortec 4200 LL8 I6 in the Saab 9-7X 4.2i. Any ideas where to find them?
    if you post your stock file I could probably tell you where in the scanner it is.
    You can open a support ticket here https://support.hptuners.com/

  7. #7
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    Ok, here's the stock file.

  8. #8
    Tuner in Training Vbb1994's Avatar
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    Quote Originally Posted by Bill@HPTuners View Post
    if you post your stock file I could probably tell you where in the scanner it is.
    I hate to resurrect an old thread, but im kind of in the same boat and honestly wondering, why isnt there a Torque PID for the P10? i know its old 02-05 stuff, but people still play with them and theres an aftermarket community thats upcoming and rising using the 4200 and p10/p12/e67

    i myself have an LL8 and would like to make adjustments to my shift firmness, timing, and such, as well as the torque management to keep the 4L60e happy....
    but i cant, because theres no Torque PID for the p10.

    the closest thing i see is volumetric efficiency airflow, which is outputted in lb/min or what have you. perhaps you could come up with some rough numbers with that.. but otherwise how does the PCM know the torque to shift the transmission??

    i can gladly share my .hpt file, or whatever
    Sometimes money isnt an issue, sometimes it is. Sometimes time is an issue, sometimes it isnt. Never at the same time are they both not an issue.
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  9. #9
    Tuner in Training Vbb1994's Avatar
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    I take it nobody will be answering this one anytime soon.

  10. #10
    Tuner in Training Vbb1994's Avatar
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    Coming back to this one... for future readers looking for stuff on the 4200, i came up with a method get your torque values @ the crank close... not exact...

    Theres a PID called Volumetric Efficiency Airflow [2311].. log it in your channels as lb/min.

    Then create a user math with the following equation
    ([2311] / ([50070.56] / 60 * 3) / .01 * 4.5)

    Its emulating g/cyl measurements like the MAF referenced cars use, and then multiplying by 4.5...

    The 4.5 is the magic number the MAF guys use to multiply their g/cyl by to get a close approx of crank TQ. Its been used on the scanner against dyno numbers and yields similar #'s


    Like i said its not super accurate but it gives you a close TQ number to reference for shift tables.... i dont know exactly how the PCM calculates tq, but maybe this helps.

    Like for example @ 6300 i will see 29.xx lb/min , if multiplied by 10, thats 290 whatever HP, that "seems" reasonable for the 4200, but again definitely not exact.