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Thread: 2013 JK Wrangler 3.6 Cannot Increase Rev Limiter

  1. #1
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    2013 JK Wrangler 3.6 Cannot Increase Rev Limiter

    I've got a Pentastar 3.6/NAG1 currently on the dyno and for some reason I cannot increase the rev limiter above the stock 6350rpm limit *when in autostick mode - info added for clarity*.
    The speed limiter has been increased well beyond the logged speed and the vehicle has been dyno'd in 3rd and 4th gear with exactly the same issue.
    Every time the RPM goes above 6350 the "Throttle Torque Source" PID changes to "RPM Limit" which is then followed by the TB closing. No faults or any issues.
    3.6RevLimit.PNG

    What I've done:

    ENGINE -> Cutoff, DFCO

    Cutoff = 7,000
    Autostick 1st = 7,000
    Drive = 7,000 (for ECT rows of 118C and 120C)

    Maximum = 7,000

    Control Method: Use Spark = Enabled

    TRANS -> General

    TCM RPM Limit = 7,500
    Limp Offset = 500

    ECT RPM Limit = 7,500 (for ECT columns 110C, 120C and 125C on all gears)
    EOT RPM Limit = 7,500 (for EOT columns 130C, 140C, 150C and 155C on all gears)

    Its still making good power at 6350RPM so I'm trying to let it rev out to 7000RPM but I dont know what im missing here

    Anyone run across this issue before?

    Tune attached:
    2013_JKUR_Dyno_7000rpm.hpt
    Last edited by HaasExp; 03-13-2022 at 10:15 PM.

  2. #2
    Senior Tuner SultanHassanMasTuning's Avatar
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    you will need to adjust the DSS as well
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  3. #3
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    Quote Originally Posted by SultanHassanMasTuning View Post
    you will need to adjust the DSS as well
    DSS? Where abouts will I find this parameter mate?

  4. #4
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    I've been tuning a lot of JKs and I've noticed that on 2012 and 2013 there is no autostick cutoff table that you can adjust, you just can raise revlimiter on drive and ajdust shift schedule so you can rev it to 7.000 rpm. 2014 and up doesn't have this problem as you can see on the attachment cutoff.jpg

  5. #5
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    Quote Originally Posted by ssuazo_97 View Post
    2014 and up doesn't have this problem as you can see on the attachment cutoff.jpg
    Thanks for the info ssuazo_97! Looks like that parameter is exactly what I'm missing. I've contacted support to see if they can add it to the 2013 JK Wrangler platform

  6. #6
    Senior Tuner SultanHassanMasTuning's Avatar
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    yes correct autostick needs to be there as well, did you try opening file with latest beta
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  7. #7
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    Trans table 46017 (WOT Shift) is still stock so will need to be raised.
    I raise ALL the trans shift schedule tables near pedal position 100% and at WOT to way past the rpm you desire.
    Then use the trans rpm limit to make it shift at chosen rpm. Works great and easy to adjust.
    This tune shifts right on 7k with the trans limit at 6900.
    Attached Files Attached Files

  8. #8
    Set your ECT and EOT trans limits to where you want the shift to occur as well. I would do 6900 all the way across on all gears and set the tcm rpm limit at 6900. Like hemi tuna said.. set your wot rpm limits to around 6900.. 6850 should get you desired when calibrated for each gears output speed.

  9. #9
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    Quote Originally Posted by Hemituna View Post
    Trans table 46017 (WOT Shift) is still stock so will need to be raised.
    I raise ALL the trans shift schedule tables near pedal position 100% and at WOT to way past the rpm you desire.
    Then use the trans rpm limit to make it shift at chosen rpm. Works great and easy to adjust.
    This tune shifts right on 7k with the trans limit at 6900.
    Cheers for the info Hemi. Guess I should have clarified that I was using autostick mode 4th gear for the dyno runs. With this tune the trans is set so the TCC stayed locked in 4th gear autostick and does not auto downshift even at WOT.
    Thus I'm currently trying to increase the rev limit in autostick mode.
    I've requested [ECM] 44484 - RPM Limit Autostick to be added to the 2013 JK Wrangler platform. This seems like the solution.

  10. #10
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    Hey Hemituna, I sent a PM.

  11. #11
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    Took a bit longer than expected but I finally managed to get HPT support to add the ECM 44484 Autostick RPM limit table.
    Problem solved!
    Autostick rpm limit.PNG