In Reply to: Which wheel covers provide better brake cooloing? posted by Bailey on September 08, 2001 at 10:57:30:
On the street there is no warping danger with any of the combinations you reference or even with any other rim. On the track even you can probably get away with either or neither if you don't push the brakes too hard as some tracks do. Note that the 540i does not have these rims and does fine on track.
The turbines are much better temperature-wise though. Some people on the E34 M5 E-Group ran some IR pyrometer measurements and may have found as much as 50 F drops with the turbines.
The other options is to dump the foglamps and run brake cooling ducts, but it all depends on how serious you are about this stuff.
I like the looks of the OEM throwing star wheel covers better than the fan style, but does one provide better brake cooling than another? I also like the looks of the wheel without either of the covers, but am I then risking warped rotors?
Thanks for oppinions and advice.