Quote:
Originally Posted by TeutonicShift89
Does this really help anything---or is there sarcasm afoot?
Like coolant bearings and headlight fluid?
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The stock system does exceed the 1.1 bar of pressure that the stock cap is rated for, that is why there is an expansion tank and you can view changes in the volume of coolant in the tank at normal running temps. If the system didn't exceed 1.1 bar there would be zero reason for the expansion tank because its the expansion that is raising the pressure.
The higher the pressure you can run in the cooling system, the less likely your coolant is to boil. A higher pressure cap can be very handy, not only to keep the coolant in the system, but also keeps it off the track and your tires if you get severe boiling for extended periods of time. The 1.3 bar cap will raise the pressure by containing more coolant in the system and releasing less into the expansion tank.
Subaru didn't fit a 1.3 bar cap because a 1.1 bar gives plenty of boil over protection for a street driven car and its a standard part for all their other cars. If you're regularly tracking your car like I am in an area that doesn't see temps much below freezing and want to run a 70/30 water/coolant mix, then a 1.3 bar cap is probably a good idea.