| I swapped out a Nismo 65 degrees C thermostat for a Billion High Flow thermostat that opened at 71 degrees C. Despite the higher opening temp of the Billion thermostat, on track engine temperatures dropped from 215-220 to 200-205 Nismo on the left, Billion on the right
 Billion:
 Nismo:
 Prior to this modification, We also performed the following mods to improve airflow to the radiator: 1) Swapped out the Selin elbows for Ash's planar intake kit with apexi filters. This allowed us to completely tuck the filters behind the bumper support, which allowed us to remove all the shielding from the prior setup 2) Removed the aux fan from the condenser. 3) Added a radiator air guide These 3 modifications were worth about 20 degrees total reduction in coolant temp. So...in combination with the thermostat, on-track temperatures have dropped almost 40 degrees. The customer dropped from 240ish to 200ish. Temperature were measured on a SPA temp gauge. On the oil system, we swapped the Nismo high flow oil cooler to a Z1 full flow setup. This dropped engine oil temperatures from 250+ degrees to 235. Again, temps were monitored on a SPA temp gauge. He had an alarm set at 250 degrees, so it may have reached higher temps had he not throttled back.
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Billion Highflow thermostat and other cooling mods - 
