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      09-14-2012, 01:11 PM   #11
ajm8127's Avatar

Drives: '07 335i
Join Date: Aug 2012
Location: Pittsburgh

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Originally Posted by N54_Fan View Post
I am working on getting data on the ATF temps but suspect they are only a ~10 C hotter than the water temp at normal driving. I may know the answer to this during this weekend. Water temps are between 97-102 C with daily driving. So I think ATF will be about 107-112 C. Even spirited driving with some WOT pulls gets my water temps only up to 108 C.
I think using 'M' mode produces the most heat, from what I have read at least. If so, this is the use case we should be targeting with the cooler upgrade.

As a side note, do you know which line is which on the transmission? One supplies fluid to the heat exchanger, and one is the return back to the transmission. The realOEM and Tischer diagrams are ambiguous, in my opinion.