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    Frequently Asked Questions

    The difference between blue top and brown top solenoids is their orifice I.D (blue tops have a larger opening). and internal windings/closing spring rate that's it, oh, and PWM table control in firmware.  Blue top solenoid higher fluid flow results in higher pressure that produce shorter shift events during part throttle operation that gives more firm faster shifts part throttle than old obsolete brown tops, tcu tunes work for brown tops but performance won’t be at peak level compared to Blue Tops and shifts per gear might not feel exactly the same.  The majority of 2005-2006 722.6 transmissions have blue-top solenoids stock, Most all V12 cars came stock with them 722.649 trans. Some older 03 04 cars had transmissions replaced due to radiator issues and got updated transmissions with blue-tops. When you change out the conductor plate is when you can see if you have blue or brown/black solenoid tops. If you have brown tops my calibrations still work but won't be the greatest as PWM tables are set for blue tops as most upgrade to blue tops anyways. For best performance is to upgrade them to blue tops. SLR tcu will still work with brown-tops but performance will be degraded and shifts might not be exactly the same until you upgrade. All 722.6 Cars need blue top solenoids for the best results for any tcu tune.
    TCU has redundant data stored in firmware for 10+ different car variants that include torque curves, pressure maps, tcc control, gearbox planet ratio for large and small 722.6, and many more function calibrations, and when you use a scan tool to write coding to the chassis of a car it reverts any changed calibration area back to STOCK virgin calibrations for that coding of chassis that was entered.  DO NOT RECODE TCU OR YOU WILL GO BACK TO STOCK. If the coding string needs changed use mbgeartool/vediamo or pull the file and manually code with winols or other hex editors.  
    That is located in ECU and NOT in TCU and is NOT recommended to be removed. Some guys wanna do Neutral Drops and that damages transmission. Also is there to keep engine from over revving if transmission is knocked into neutral.

    Just contact us with your make and model and if you have TCU part number which starts with A03xxxxxxxx

    Answer is No. SL55 uses 2.82 gearing and few other different codings.   CL55 tcu will work in S55 with no issues

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