We have run our MCS
on the main Willow Springs track and most of the tracks in Nevada and SoCal with no problems. Our MCS
is not stock, but last year we ran a stock Cooper on several tracks, including Las Vegas in August when it was very hot with no real problems.
However, we do change to a high temp. brake fluid like ATE or Motul and we are running upgraded brake disks and pads on the MCS
. The stock Cooper, with only brake fluid and CAT back exhaust change did OK but lost some engine power on the main straight in Las Vegas when it got real hot. On a hot day at Willow Springs, you will want better brake fluid and the relatively inexpensive intercooler air diverter and water spray unit from Alta helps keep heat related power loss down.
When we were at WSIR, a Porsche club was running on the Streets course and having a great time.