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Thread: Supercharged 3.6 Challenger transmission shift hit limiter

  1. #1
    Potential Tuner
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    Jul 2019
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    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
    Tuner coanan's Avatar
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    Just a guess, but maybe the you need to increase the spread between eng and TCM RPM.
    2013 Chrysler 300S, 6.4 BGE with 6.4 SRT cam, AIT 18% OD pulley, E-force with 2.62 pulley(11.4 lbs boost??), fastman 84+4 mm throttle body, 1 7/8 kooks long tubes w/hi-flow cats, 3" Magnaflow Cat-back, FTI 2800 stall, Trans built by Hellraiser, Dings Racing valve body and tune, Getrag 3.73, Walbro 400LPH, DW 65# inj. LG aluminum rad. Dual SRT fans. Complete 4 piston Brembo upgrade. Stage one MOPAR springs, XIX X39 22x9 +15 - 22x10.5 +22 with NITTO NT555 265/35R22 - 295/30R22

  3. #3
    Senior Tuner Russ K's Avatar
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    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
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    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.