Results 1 to 5 of 5

Thread: Supercharged 3.6 Challenger transmission shift hit limiter

  1. #1
    Potential Tuner
    Join Date
    Jul 2019
    Posts
    2

    Supercharged 3.6 Challenger transmission shift hit limiter

    Hello guys need some assistance. I have a 2013 challenger 3.6 with a stage two Sprintex supercharger and 3.64 rear gears running 370whp and 368 pounds of torque at the rear wheels after the Dyno tune. After the tune now during shifts it seams to bounce off the limiter. I also noticed that during the shift the TPS% drops by half to 38%.What am I missing. The limiters have been raised to 7000 on the engine and 6800 on the TCM. I have attached the tune file and the run log to review. thank you for the help in advance this tuning community is awesome. SSP_Dyno_2 rico alt (FG).hptlittle river test 2.hpl

  2. #2
    Advanced Tuner coanan's Avatar
    Join Date
    Mar 2009
    Location
    S. Florida
    Posts
    582
    Just a guess, but maybe the you need to increase the spread between eng and TCM RPM.
    2018 Trackhawk PCM/TCM tune by Dusterhoff.
    Flex Fuel, MMX faux 95mm TB, GripTec 2.85, 10% ATI lower, FIC1200, ARH 1 7/8 w/cats, 180 T-stat

    13 Chrysler 300S, RAM BGE 412 stroker, cam motion 232/246 619/619 118 +4, ATI 18% OD pulley
    Whipple Gen5 3.0, 2.50 upper pulley, Smooth Boost controller, FIC 1200 inj. Nick W 108mm TB, FORE dual return fuel system, E85, FTI 2800 stall(SRT83380), SHR WAR Viking trans and valve body, Getrag 3.73, 1 7/8 kooks w/hi-flow cats, 3" Magnaflow Cat-back 943rwhp

  3. #3
    Senior Tuner Russ K's Avatar
    Join Date
    Dec 2005
    Location
    Regina, Sask.
    Posts
    4,213
    You have the WOT 1-2 set at 9190 RPM, the 2-3 is set to 8595 RPM and the 3-4 is set to 7332 RPM. Your PT 2-3 shift is set to 8376 RPM, the PT 3-4 shift is set to 7120.

    The Dodge shift speed tables are trans output RPM's.

    Russ Kemp

  4. #4
    Potential Tuner
    Join Date
    Jul 2019
    Posts
    2
    Thank you guys for the input and information. I will increase the spread by dropping tcm to 6400. I lowered all the shift points to trans rpm to match a 6400 shift. Thanks again. Just a thought would this cut the tps% to half because it?s bouncing off the rev limiter or will that be a separate issue.

  5. #5
    If the rpms reach the rpm fuel rev limiter.. yes it's going to close the throttle body in an attempt to lower your rpms below the limit..

    Always good on a 5 speed.. leave the TCM rpm limit where you want the shift to occur, the limp offset above your rpm limiter.. so it doesn't go into limp mode.

    Also would set all the ECT and EOT rpm limits to match your tcm rpm limit so it doesn't get confused I suppose. Pretty sure the TCM RPM limit is the say all at the end either way but I like to keep it simple.