Went to Willow Springs yesterday (Big Track).
AT, 90% Distilled water + 1 Bottle of MoCool, Stock OC with thermostat spring removed. Cobb tune running 93 octane map with about 97 octane mix in the tank. Heater on for every run. Ambient temps from 80 to 90+
No limp mode, but I knew the coolant and oil temp values for limp mode so I never let it get that high. Track is also fast which probably helped keep the temps down. Highest coolant temp I think I saw was about 106.
By the end of the day fastest lap was 1:46 IIRC. Fastest spec miata is a 1:36
I now comprehend the understeer issues with the car. It plowed through turns. Instructor even commented on the understeer characteristics.
I used the Cobb AP to log several sessions. Data below. Looks like highest oil temp was 280.
Also used a program called
TrackMaster from the Android market. The $10 app uses the phone's GPS signal to log data points through the session. I found that the lap times were no more than 1-2 tenths off the transponder times. With an additional bluetooth GPS device it might be even more accurate.