EJ20K/R Coolant Temperatures
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Scooby Newbie
Joined: Apr 2026
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EJ20K/R Coolant Temperatures
Would anyone here happen to know the warmed-up operating coolant temperature of an EJ20K/R? I recently put a Link WRX4X (factory-modified for Twin Turbo control) into my Legacy GT-B and have had coolant temperatures between 94-97°C while idling (fans don't even cool it down, it just rises Lambda sub .950-1.000) and up to 98-102°C when driving, especially at light throttle on the highway (the car was running a lambda of 1.02-1.08 at these times and I have been trying to fix the fuel table). The only way to have the temperature drop is to rev the motor to 2-3k when stationary, then let off. On the highway, I have to give the car a good amount of throttle to speed up, then let off to cool down. I am not ruling out an issue with the coolant system overall. I want to make sure the temps aren't getting out of hand, should the system be functioning correctly.
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