Radiator caps

[NorCal Ray]

Can anyone tell me what pressure radiator caps to use for the front radiator and the degas tank in the rear? I know that you have a higher pressure cap up front than the degas tank in rear. I can't find the thread that discussed this.
Thank you, NorCal Ray

[Tamra]

The degas tank cap is 15.6psi, the radiator is about 20psi. Also to keep in mind, the radiator cap design in a Subaru does not pull vacuum, it only releases pressure, and the turbo coolant reservoir is the one that siphons the liquid back in from the overflow tank on cool down.

In our build we deleted the degas tank (oil cooled turbo so we did not need the turbo coolant res), so we had to swap the caps so our overflow worked properly, allowing our radiator to pull vacuum from the overflow tank.

[NorCal Ray]

Thanks Tamra, very helpful!!
NorCal Ray