You are suppose to run the higher pressure on the radiator.
Subaru 1 3 bar radiator cap.
After diagnosing my overheating problem which seemed to have been caused by a busted valve in my radiator cap i am now needing a new one.
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For example you would run a 1 3 bar cap on the radiator and a 1 1 bar cap on the turbo tank.
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Avoiding boiling makes head gasket failure less likely.
The 1 3 bar radiator cap will improve the cooling efficiency on the subaru wrx sti.
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The cap increases pressure and does allow temperature to go up about 10 degrees before fluid boils but does not reduce temperature.
The turbo tank needs the lower pressure cap since its job is to overflow the coolant into the overflow tank then after shutdown it will suck it back in.
Use the 1 1 bar coolant reservoir cap for the coolant expansion tank which sits atop the intake manifold on every turbocharged subaru we support.
And only if you have an aftermarket.
I have read a few topics here and there all over the internet with advantages and disadvantages but most have been heresay and there arent many facts to back up what people have posted about in their.
1 1 bar vs 1 3 bar radiator cap posted in general.