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Thread: Idle Desired & Integral Airflow Issue

  1. #1
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    Idle Desired & Integral Airflow Issue

    Have a car thats not responding as they normally would. Usually if Idle Desired Airlfow is too low, itll have dips thats hard to catch, raise it up until Idle Integral Airflow isnt having to add any corrections. but this is showing Integral at .5 lb/min or so, add that to tables and its still showing Integral adding .5, did that couple times and Integral never changes keeps adding and doesnt seem to get too big where it starts yanking timing out as its means to lower idle rpm when you overshoot? Found it kind of odd - put up 3 iterations showing Idle Desired Min raised but not effecting Integral
    Attached Files Attached Files
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  2. #2
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    Try these values. I based them off your dynamic air flow

    1.PNG

  3. #3
    Senior Tuner Lakegoat's Avatar
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    Are you tuning in SD? Maf fail high is 1, fail low is 14,000---shouldn't that be 1,2? P0101,102,103 are no mil light, should be mil on first? Commanded afr is 20.58, making your stft's chart way off.
    2000 Camaro SS 2015 L83 port injected, Whipple 3.0, 4L80E, 8.8 Ford
    2013 Silverado 5.3, 6L80k 8.8

  4. #4
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    Thats where I usualy start hjtrbo - but I can keep raising those values to silly high ones and its still acting like it has to learn and add air, something isnt adding up. If you overshoot it you should get to a point where it cant lower idle airflow with blade position and it will pull timing even into the negatives but this will not???

    Quote Originally Posted by Lakegoat View Post
    Are you tuning in SD? Maf fail high is 1, fail low is 14,000---shouldn't that be 1,2? P0101,102,103 are no mil light, should be mil on first? Commanded afr is 20.58, making your stft's chart way off.
    It will fail is MAF reads anything above "0" Hz, or fail it if it reads anything below 14000 Hz. Works either way. I didnt notice not being MIL on first. COmmanded is 20.58 because tune is scaled in half I believe, I inherited this from elsewhere
    Last edited by GrannySShifting; 11-25-2020 at 12:59 PM.
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  5. #5
    Advanced Tuner
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    Apr 2016
    Posts
    331
    Any luck with this? Trying to fine tune my idle. Have added to Min Airflow to closely match Desired and where it actually runs at, but Integral still stays low. I am paying attention to the Min Airflow ECT multiplier as well, and taking it into consideration. It seems that adding to Airflow Min does not seem to bring Integral closer to zero.

  6. #6
    Advanced Tuner
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    Apr 2016
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    Another thing I don’t get is how Integral can be -20 to -40 lb/hr when actual airflow, Min, and Desired are around 70 lb/hr. You certainly aren’t going to be subtracting that much and it still be running.

  7. #7
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    Quote Originally Posted by NotSure View Post
    Another thing I don?t get is how Integral can be -20 to -40 lb/hr when actual airflow, Min, and Desired are around 70 lb/hr. You certainly aren?t going to be subtracting that much and it still be running.
    I feel like this is a reporting error in HPTuners that has shown up in later versions
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere