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Payam @ BMS Payam @ BMS is offline
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Posts: 6,161
Join Date: Oct 2013
Car: e90 335i
Default 12-31-2018, 09:17 AM

Originally Posted by Kaane
The factory cooler serves 2 functions, 1 to cool the fluid, but it also is used to heat up the fluid and also to keep the temperature fluctuations down. If you just replace the factory setup the warm up for the transmission will take a lot longer and also temps will go way high during stop and go traffic. I would supplement the factory setup not replace it. Most people that install additional coolers leave the radiator setup alone.
The coldest weather so far has been 36F here and it only took about 5 minutes to get up to 120F+, I don't see that as an issue as it takes longer for engine oil to warm up.

I have been testing this for a very long time in the traffic conditions you speak of. It does not go above 160F and this is at 110F ambient after about 20 pulls. I literally tried to brake this car when testing.

Engine oil temps went to 270F and I had to stop to let it cool. Trans temps 160F and wouldnt go any higher after letting it sit on idle for ten minutes to let the engine oil cool. That should speak volumes of how efficient this is.

Originally Posted by Boland01
Payam- I would add to your instructions to make sure the transmission is at the correct fluid level per the ZF procedure. Our transmissions are pretty sensitive to this. I'm sure this will be a great product.
Correct, it will need about a Qt extra. I was just giving some relative steps so people can see how long it will take.

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