Quote:
Originally Posted by Compelica
I'm toying with the idea of getting an aftermarket thermostat. Based on opinion the stock radiator has significant thermal capacity left to sink more heat, but most don't advocate changing the thermostat given reliability concerns. However all things considered, I wanted to address two particular potential benefits with the lower coolant temp on my setup:
1. Oil cooling. I'm on the Forester water to oil exchanger and having a larger coolant to oil temperature delta will further reduce oil temperatures.
2. Knock resistance - lower coolant and oil temps would influence cylinder head and bore temps, reducing the tendency to knock. This opens up further tuning potential.
There's several choices of thermostats available for our cars:
1. SARD 68C/82C
2. Mishimoto 76C
3. Billion 65C/72C/82C
4. NTCL 82C
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I have a Cosworth thermostat 76C (not the one from Mishimoto). The coolant temperature sits at around 80C-82C depending how hard I drive. Oil temperature is also a few degrees lower even without an oil cooler. These are non-idle temperatures where the heat exchanger can work.