maybe someone else has run across this...

previously (about 30 days total), my track oil temp had always been around 225-235, no matter what track, no matter how hot the day. before the start of this season, in addition to a new OEM clutch, i did an ECU tune (not softronic, but was done by reputable shop) which increased HP/TQ by about 15/10 at the wheels, as well as swtiched from mobil 0w40 to redline 5w40. for my 2 events so far this year, my oil temp was 250...in sub70's weather.

any ideas for the jump in temp? could it be the tune or the brand switch? (i'm thinking it's obviously not the "0w" vs "5w" as that indicates cold operating temp viscosity etc.) i know 250 track temps are not uncommon BUT i find it hard to believe i'm THAT much faster/harder on the car since the end of last season, or that my radiators have suddenly clogged/taken a crap. my OCD self would just like a reasonable explanation.

thanks for any thoughts...

 

Increase fuelling and ignition timing curve along the rev range will increase combustion temperatures
re-asses air to fuel ratio and ensure additional fuelling has been added to help keep combustion mixture lower.
ensure radiator fan maximum

 

True on fuel/air/timing creating more heat. If the engine is doing more work it will produce more heat.

Since you changed oil as well it is possible that the Redline 5W40 is better at heat transfer than the Mobil 1 0W40.