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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications 8hp70 Trans
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      08-02-2020, 11:49 AM   #1
535_BiTurbo
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8hp70 Trans

What is the normal operating temps on the 8hp70? Ive read that 240-250*F is ok. This true??
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      08-02-2020, 07:49 PM   #2
BurrNinja
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Quote:
Originally Posted by 535_BiTurbo View Post
What is the normal operating temps on the 8hp70? Ive read that 240-250*F is ok. This true??
Mine would get to roughly 230ish according to Torque Pro. Havent seen any higher.
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      08-03-2020, 08:12 AM   #3
95blkmax
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Highest temp I ever saw was 232* but it was typically stable around 228*-232*. I don't like it.

I've contemplated upgrading the cooler upstream of the trans heat exchanger, but then realized that the heat exchanger has an integrated thermostat that would simply stay closed until the temp it needed to open- nullifying whatever cooler temps the upgraded cooler would yield.

So therein lies a new question, has anyone messed with the trans heat exchanger thermostat? The thermostat is #10 in the diagram here , but it is not available separate from BMW. Only in conjunction with the cooler itself (#9). I think messing with this (or gutting it if possible? lol) would be the key to getting lower trans fluid temps.
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      08-03-2020, 12:41 PM   #4
535_BiTurbo
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ok i was seeing 232-234*
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