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Thread: OEM Camaro LT1 8speed A/T throttle response in 3rd

  1. #1
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    Question OEM Camaro LT1 8speed A/T throttle response in 3rd

    hello to all,

    we've some customer that claims a problem with their brand new Camaro.

    We tried at least 4 different vehicles and all have the very same behaviour, regardles of being brand new or with few thousand km on the clock.

    you put the automatic 8 speed transmission in manual, select 3rd gear, you accelerate above 3.500 rpm, then you lift the throttle pedal and let the engine speed go down to 2200-2400....

    when you are in this range (2200/2400 RPM) and you press again the accelerator pedal (slowly or hardly, does not matter), you've ZERO response, the engine start to pick up revs very but very slowly... when you go out the 2400/2500 RPM and above the engine kick out full power... and the cars runs.

    it is very dangerous becouse often on the roundabout you think to accelerate and quickly go out of the intersection and you're trapped with the car don't moving don't responding to the accelerator...

    FYI no DTC, both K20 Engine and K71 Transmission are already up to date, and already replaced the air filter housing and MAF sensor... no way nothink changed...

    any idea?

    thank you so much guys!

    best regards

  2. #2
    Senior Tuner SultanHassanMasTuning's Avatar
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    this throttle delay is also in other cars that i have remote tuned in Europe no in other regions.

    i believe you would need other software for that region
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  3. #3
    Advanced Tuner veee8's Avatar
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    It is an issue for the European models. The delay is there to keep the sound Db under the limit required. There have been no differences in the Engine tune files compared to US models that I have found in the parameters that are defined.
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  4. #4
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    wow... if someone comes out with a fix, please tell me!
    thank you

  5. #5
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    hello! someone has some good news on this issue?
    thank you so much!
    best regards

  6. #6
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    Quote Originally Posted by Christian GM View Post
    hello! someone has some good news on this issue?
    thank you so much!
    best regards
    You will likely need to tune the TCM to solve this.
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  7. #7
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    ACCORDING TO GM
    there is a difference in BOTH K38 chassis module and K71 transmission module calibrations
    someoneas has found the way to fix it, on 2016 tp 2018 models?
    thank you
    best regarsd

  8. #8
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    Chassis Module calibration is different cause the Exhaust Valve control is different.

    the torque reduction is located someware in the System Segment.

    i have done a System segment swap on a 2017 Camaro EU from ID 12678404 to ID 12678400 (US). there is no difference i can see but the torque reduction is dissabled.

    have done a support ticket but Unfortunately HP Tuners cant find and add the parameter to dissable the torque reduction.
    Last edited by zr1driver; 11-15-2018 at 06:20 AM.

  9. #9
    intersting, just checked both sys cals in winols...i think I found it there is a line and a rmpscale right afterwards, in the us calibration the line is set to straight 4000 (Nm? i suppose), in the euro calibration it is as low as 160Nm@2400rpm... that's pretty much what i've seen in my logs

  10. #10
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    I have the same issue on my 2017 A8 6.2L as im in sweden and hava a euro spec camaro. I belive i hear it too that is for the car to pass some sound emission test. I would be happy to see someone come up with a fix for this as i cant see anything that differ in my pulled none US calibration and a US calibration for the Camaro SS. I will be following this thread in hope that someone find a way to get around this dangerus and irritating restriction.

  11. #11
    i will test it as soon i have a car here.
    but i am not using hptuners for tuning, only the scanner for logging.

    so the other point is to make it available in VCMeditor

    just wanted to add what i found as a picture, here you go:
    LT1-TRQLIM.jpg
    Last edited by dertobi; 11-19-2018 at 09:16 AM.

  12. #12
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    Here are the conditions where i get this irritating issue :

    1. Road speed between 48 Km/h to 60 km/h
    2. Steady speed for a couple of seconds
    3. Then if you press the accelerator slowly or try to go WOT do not matter, the trottle respons is almost zero for some seconds or until i get over 60 km/h.

    It really feels strange when the car dont react at all on the trottle for some seconds, and i guess it can be even dangerous if i quickly would need to speed away to avoid some danger.

    Hopefully someon can help out to get around this crazy restriction GM put in to the Euro calibration.

  13. #13
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    any news about this problem?

  14. #14
    Advanced Tuner f.creek-ranch's Avatar
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    What about the torqoue coeff ? anyone interpolete These values? i dont know much about these things, only play and learn, but do the torque not rise with the rpm ???
    Think at first to disable torque Management, then torque model....

  15. #15
    Quote Originally Posted by ch_swat_89 View Post
    any news about this problem?
    still couldn't test it, Us cars/ Camaros are not my all day business here, so i have to wait until a customer shows up

  16. #16
    Advanced Tuner f.creek-ranch's Avatar
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    even cant try it yet. ill have to wait till March.
    i set torque model engine coeff spark and rpm in the range 2000-3000 new - just interpolate the significant values.
    we will do the same Thing on a 2015 Mustang the next days - we will see....even there must be a fix for the 6.gear on the stang....searching for it, i think we must log the tables first.

  17. #17
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    for the 2015 Mustang there is a switch for pass by torque limit disable in Torque Management -> General.

    i also working on the Camaro torque reduction issue. maybe someone can send me a .bin read from a 2016 Camaro Europe version.

  18. #18
    Advanced Tuner IARLLC's Avatar
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    ZR1 Driver, You mentioned above, "i have done a System segment swap on a 2017 Camaro EU from ID 12678404 to ID 12678400 (US)." Did you use acdelco TDS? Years ago they were much more cooperative on such things. With a phone call I used to get them to give me other options. The last few years they have become pretty rigid about what they allow.

  19. #19
    Advanced Tuner f.creek-ranch's Avatar
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    we tuned a 2015 Mustang by interpolate the vct tables in torque model. the values between 2-3k are significate lower, so we correct this. tested it today. it Wakes up the engine !
    the Software in the camaro is different, but also torque based.
    i think there must be a reduction in torque/spark to lower emissions between 2-3k rpm.
    what abut ecm 32452 and 32464 ? anyone can explain These tables for what the coeff. are?

  20. #20
    It has nothing to do with the torque model itself.
    Zr1 driver and I are in contact, and he will test my solution next week, because I dont have a car available that quick.
    Meanwhile I am 100% sure it is the map I mentioned above, which is not in hpt
    It is a axle torque limitation. Also we found out that this limitation is not as bad on the '16 models then on the '18.