Boiling coolant at the track.

2011 Nismo#91

Thank you for all the responses,

I don't there there is a leak in the radiator, under the car looks dry, but I do know they are prone to failure. I did install the Soho oil catch can/ coolant overflow just recently maybe that introduced a bubble, but driving to and from the track the temps looked very normal. I didn't notice any contamination at the top of the coolant tank or white smoke out the exhaust. But I'll have my mechanic do all the checks mentioned.