8hp70 Trans

535_BiTurbo · 08-02-2020, 11:49 AM

What is the normal operating temps on the 8hp70? Ive read that 240-250*F is ok. This true??

BurrNinja · 08-02-2020, 07:49 PM

Quote:

Originally Posted by 535_BiTurbo

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.

95blkmax · 08-03-2020, 08:12 AM

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.

535_BiTurbo · 08-03-2020, 12:41 PM

ok i was seeing 232-234*

08-02-2020, 11:49 AM	#1
535_BiTurbo Captain 108 Rep 659 Posts Drives: 2012 550I - BMS Stg 1 & CAI Join Date: Sep 2013 Location: Texas iTrader: (0)	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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08-03-2020, 08:12 AM	#3
95blkmax Captain 213 Rep 657 Posts Drives: '11 535 M-Sport Join Date: Nov 2019 Location: Oklahoma City iTrader: (0)	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. __________________ I'm on the YouTubez now!! Check it out -> https://www.youtube.com/@turbospool 11' M-sport- 371WHP - 478WTQ on stock PWG E50 TunedbyShoup // 386WHP - 429WTQ on Shuenk N55+ with ultra-conservative 91 Octane tune // Starting full-range flexfuel tuning in Spring '24
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08-03-2020, 12:41 PM	#4
535_BiTurbo Captain 108 Rep 659 Posts Drives: 2012 550I - BMS Stg 1 & CAI Join Date: Sep 2013 Location: Texas iTrader: (0)	ok i was seeing 232-234*
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