Results 1 to 7 of 7

Thread: S550 w/ Tremec OSS issue

  1. #1

    S550 w/ Tremec OSS issue

    Any suggestions?!

    We have a 2017 Mustang roush 670 supercharger w/LT HF Cat headers with a Tremec Transmission upgrade that came from another shop but since the transmission upgrade customer have many issues... Rpm going up when clutch is depressed, no cruise control on 1,2,5 and 6th gear and power reduced in first and second gear when pushed hard. We did install the Abott Era box and OSS vs VSS was calibrated in 4th gear (1:1) so they match each other. Many calibration have been done by a renowned tuner but with no success. We are out of luck and really open to any advise. 🙋

  2. #2

  3. #3
    Here is the Roush original file w/ turned off O2 and the last calibration from my tuner.

    LP Beaulieu 2017 MUSTANG GT SUPERCHARGER KIT 670 HP SW LT Headers HF Cat rear o2 off.hptMGMVAG6-93SC LT 003.hpt
    Last edited by Exo Performance; 09-10-2018 at 08:44 AM.

  4. #4
    Senior Tuner veeefour's Avatar
    Join Date
    Oct 2016
    Location
    Poland
    Posts
    1,711
    You need to address your gear ratios in tune. Tremec offers few different ratios - make sure you have those right.

  5. #5
    Like Veefour said. Adjust gear ratios to match transmission used. Make sure they fall between the min and max settings. Should be good assuming rest of the tune is correct.

  6. #6
    Potential Tuner
    Join Date
    Nov 2019
    Posts
    4
    Can the VSS and each gear ratio values be changed with the HP tuner on a 2015 Mustang? Thanks!

  7. #7
    Advanced Tuner
    Join Date
    Feb 2012
    Location
    TEXAS
    Posts
    631
    yes, go to speedo section then under calibration is the transmission stuff

    .tremac gear ratio.PNG
    Last edited by mstang_man; 11-13-2019 at 04:04 PM.