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      08-24-2017, 11:48 AM   #50

Drives: 2011 135i
Join Date: Sep 2013
Location: Milwaukee

iTrader: (2)

Originally Posted by fe1rx View Post
I guess I should report back on my actual results with the CSF radiator. I have logged similar laps on the same track under similar outside air temperature conditions to make the comparison. I must say that I was hoping for more improvement. The cooling has gone from marginal to barely acceptable on this track under these conditions.
This is with a mild AccessPort Drive tune on an N54, so any hotter tune would further accentuate the problem. Oil temps are fine. The engine is still coolant challenged on this track (which admittedly is a tough one on cooling).
Attachment 1678974
Wow that is toasty!

Its weird but I have the opposite problem as you. Hot oil temps but reasonable coolant temps. As bNks334 said, I would be curious to see modifying the water pump duty cycle in the tune would have any effect? In theory it shouldn't make any real difference because the DME should have been commanding 100% long back in your situation, but still it would be nice to test it out and see. It can't hurt.

Out of curiosity...
Have you ever replaced the water pump before? They are known to die in weird ways.
Also what concentration of water/coolant do you use?
Any big intercooler aftermarket intercooler blocking flow?