Overheating Under Track Use
Symptoms
Coolant temperature climbs rapidly under sustained high-load driving (track days, spirited mountain driving). The factory cooling system struggles above 110 degrees C.
Cause
The factory radiator is marginally sized for the heat output of the RB26DETT at full boost. The factory thermostat opens at 76.5 degrees C, which is fine for street driving but too warm for track use. Modified cars producing more boost and power generate significantly more heat.
Fix
Upgrade to an aftermarket aluminium radiator with greater capacity ($400-800).
Install a lower-temperature thermostat (68 degrees C).
Add an oil cooler if not already fitted, the RB26 benefits significantly from an oil cooler under track conditions.
Cost: $1,000-2,500 for a complete cooling upgrade.
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