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  1. #1
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    | MCT 722.9 TCU TQ limiters.

    For years now, members have talked and discussed Tq limiters built in the TCU trans software that have been killing the fun for alot of us. Low speed roll races, response, and 1/4 mile times. Big dyno numbers that arent showing results at the track in the real world. Mercedes built in tq limits via load management to protect components in the drivetrain and such.
    Finding the maps and code in the TCU to adjust or change the tq limiters, or remove completely is a challenge. The people with this kind of info would be the programmers themselves that reside at AMG. Otherwise its like finding a needle in a haystack. Renntech's owner having worked for AMG for over a decade, and having close relationships with them is 1 of the 2 companies in the world with a TCU tune for our cars that can actually remove the tq limiters and do their magic. GAD motors in Germany is the other, but wont sell or promote their products in the USA they told me at this time. Both should work to the end result we have been looking for, reduce or removed tq limiters, to allow the M157 and 4matic, and our tunes, their full potential.

    Ive seem some interesting stuff on many E63 S 4matic tuned cars, but the 1st and second gear tq limiters kicking in via the tcu on the datalogs is interesting to see!

    Here is a quick example of brutus_tx running 668WHP dynojet, and the 1/4 mile at a best of 11.0 @ 128.7MPH..
    Here is his datalog from the 11.0 @ 128.7MPH run


    Click here to enlarge



    Click here to enlarge


    I have circled his first gear which we will concentrate on here. I added speed in the log to see where he begins and gets off the line.

    His gas pedal is at 100%, his throttle body goes from a quick fully open at 100%, then closes to 30% and 40% and begins to open back up by the shift to 2nd gear. Average closed during first gear at over 50%. Massive throttle closure. TCU doing its magic tq limiting.
    Same story with boost in first gear. Even tho 1st gear is very short and not alot of time to load up to get much boost, his car barely does better then a stock car in first gear in terms of boost. Averaging about 5 to 9 psi.
    2nd gear peak boost:13.3 psi
    3rd gear peak boost: 16.3 psi
    4th gear peak boost: 18 psi

    All this and he still ran a 11.0 @ 128.7MPH, makes you wonder if he had full potential to the wheels, where he would be!

    Grey is RPM
    Yellow line, is Throttle Blade
    Pink is Gas Pedal



    Click here to enlarge





    Now we take a look at forum member e65's from MBW Datalog of his 1/4 mile run where he has a GAD TCU tune which turns the tq limiters off in the TCU. His car makes massive power with built 5.8 motor and big turbos, beast of a car, but we are looking at TCU tq control here only.

    Lets concentrate on first gear again, i have circled it in red again here.
    His gas pedal is at 100% and once his throttle body opens 100% and it stays that way, it doesnt have any throttle closures until the 1-2 gear shift happens, which is perfectly normal during shifts! Big difference compared to the stock TCU tq limits we looked at above with massive throttle closures.
    Lets look at his boost in first gear. No boost reduction here, he peaks at about 20psi in first gear!
    2nd gear peak boost: 21 psi
    3rd gear peak boost: 21 psi
    4th gear peak boost: 22.5

    Grey line is RPM
    Pink line is Throttle blade
    Green is Gas Pedal



    Click here to enlarge

  2. #2
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    If anyone was wondering how hard a w212 e63 4matic can launch with no tq limiters via GAD tuning..


  3. #3
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    TCU or "CPC"?

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    Also, where to buy "MBW Datalog"?

  5. #5
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    Yes Reputation No
    Click here to enlarge Originally Posted by MuffinFlavored Click here to enlarge
    TCU or "CPC"?
    The W212 MCT 7 speed, tq management lives in the TCU.

    Click here to enlarge Originally Posted by MuffinFlavored Click here to enlarge
    Also, where to buy "MBW Datalog"?
    The datalogger is from HP tuners..

    https://www.hptuners.com/mpvi2/#custom_form_mpvi2

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