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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Tracking, Autocrossing, Dragstrip, Driving Techniques > N55 335xi automatic performance radiator.



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      10-02-2014, 09:49 AM   #1
cburn
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N55 335xi automatic performance radiator.

Does anyone know if there are any options for an automatic 335xi n55 performance radiator?

The only option I seem to find is to buy an aux transmission cooler and upgrade the radiator to a performance one that states "Manual only".

I was looking to see what is different about the radiators on the manual and automatic but I was unable to find a decent drawing or picture. Does anyone have details on that?

Thanks,
Cburn
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      10-02-2014, 10:14 AM   #2
shadow191
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Autos have a transmission fluid cooler that taps into the radiator. It's the metal block toward the bottom right behind the radiator. It uses radiator fluid to moderate transmission fluid temp. I think the difference between manual and auto radiators is that the manual one has no fittings for the hoses to the tranny cooler.
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      10-02-2014, 10:30 AM   #3
cburn
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What worries me is will a small aux tranny cooler be enough? I'd hate to upgrade the radiator and throw a small aux cooler on the tranny and find out I have a cool engine but my transmission is constantly overheating.

I wonder how hard it would be to mod a performance radiator to allow the same connections as the stock automatic. I can tig weld aluminum but I don't have any idea if it's even possible.
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      10-05-2014, 11:22 PM   #4
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Anyone running After market trans cooler?
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      10-06-2014, 08:03 AM   #5
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A few people have tried it, but no one has really posted results. And user 135Pats was going to do it, but a reputable shop told him not to since there were issues with fluid pressure dropping after the install. Just pull a search for transmission cooler, there are a lot of threads.
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      10-07-2014, 11:44 AM   #6
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I found a few threads. Thanks.
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