Overheating on track only

[alexk]

Originally Posted by adem.csl

Alex were you driving close behind another car picking up their heat from running in their hot air?sounds a bit like sticky thermostat that has freed off.could also be the fin in the water pump if you have plastic fin water pump the fin gets hot expands and loosens from the shaft then catches again.
I've only done 2 trackdays soo far and last one was last week.ambient temps of 28-25c give or take(was a hot day)and i got 125c oil temps and water temp perfect half way used track and sport mode all evening.run like a dream!

Well, it was busy in general. I need to check my videos to see when I was behind other cars.
If you see a post of mine with some thermostat tests, I think the S54 thermostat design is a bit clunky and I start to believe that it develops issues over time, especially on cars that are not being driven oftenly.
If the thermostat does not open my 1-2mm, the water flow will be reduced.
The water pump could also be problematic, I am going to replace it soon.

Originally Posted by Graham

110-115 on a 38c day!? Is that standard oil cooler? Mine hits 124 on a cold day!

Standard oil cooler yes.
I didn't see 120 at all.
PS : I changed my oil one day before the trackday and in general I change oil + oil filter every 3k km.