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Thread: Evo X MR - Transmission Overheating Issues

  1. #1
    Administrator The Altered Beast Gumba's Avatar
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    Jan 2009

    Question Evo X MR - Transmission Overheating Issues

    Import Tuner 8/2010

    Mitsubishi Lancer Evolution X MR
    The EVO X MR equipped with a Twin Clutch SST (sports shift transmission) using a 6-speed dual automated clutch system shares similar transmission gearbox technology used in the Nissan R35 GT-R. The EVO X clutches are hydraulically-operated but are told what to do and how fast to do it via two computers: the ECU, and the Twin Clutch SS-T computer. An example would be while accelerating in 2nd gear, 3rd gear will get preselected with the clutch ‘in’ and as soon as you “slap” the paddle shift. One clutch is opened while the second is closed simultaneously to deliver a quick responding transmission with no interruption of traction when shifting. Unfortunately the transmission has been known to overheating when driven on a race track. Numerous SST owners recall their cars unable to handle more than three hot laps around the circuit before entering limp mode as a “slow down” light on the dash followed by a warning chime would emit, forcing the driver to pit for a mandatory cool down session.

    EVO owners, desperate for a fix to overcome their overheating problem during the early manufacturing stages of the car, attempted to modify the factory trans cooler by removing the driver side fog light to increase air flow to the factory core and adding a puller fan to the back side of the cooler. This modification seemed to temporarily mask the problem at hand but proved minimal in improving cooling issues for the already maxed out factory cooler.

    Mitsubishi Lancer Evolution X MR Factory Transmission Oil Cooler
    Greddy offers a V-mount dual cooler kit using both the existing OE cooler and an additional Greddy core. The Circuit Spec Trans Cooler optimizes air flow to the V-mount kit using an aluminum shroud to filter air into both cores while an additional in-line electric oil pump provides increased oil flow to aid in eliminating heat retention. Extensive track testing at Japans Tsukuba Speedway by Greddy engineers revealed within 16 minutes of racing on the Tsukuba circuit triggered an OE equipped trans cooler EVO X into “safe mode” as temperatures climbed to 140 degrees Celsius (284 degrees Fahrenheit). Additional testing using the Greddy V-mount cooler improved transmission cooling dramatically as test data showed an improvement of 17 degrees Celsius (62.6 degrees Fahrenheit) during a nine minute track session and 39 degrees Celsius (70.2 degrees Fahrenheit) at 16 minutes in comparison to the stock transmission cooler.

    Last edited by Gumba; 11-14-2010 at 10:32 PM.

  2. #2


    Thanks for the useful information! I helped your advice!

  3. #3


    Thanks for the useful information! I helped your advice!
    home depot ess

  4. #4


    I'm new to this issue and you helped me.

  5. #5


    Depends on when I return from Greeley, might try to swing by, haven't seen anyone for a while


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