sti69

iTrader: (1)

Is there any benefit in upgrading these caps from 0.9bar to 1.3bar?

pslewis

If you have to ask, I'd say the answer would be a big NO!

bmposer

iTrader: (3)

It will certainly so up any weak links in the cooling system,
I fitted one and first of all it blew top and bottom rad hose's,
Then the water pump started to leak so replaced that,
now the rad has started to weap from the end cap but the car is a 1995 wrx so it could be down to the age of parts to.
As for benefits, I have not noticed anything different with the temps.

robimportwagon

right here goes. the idea behind a higher pressure cap is to cope with higher coolant temperatures associated with heavy engine loading. ie higher cooling system pressure means higher boiling point of the coolant which in turn means that when extra engine heat is generated there is less chance of the coolant boiling off and creating airlocks that then create hotspots inside the engine that can cause fatal engine damage. i do know that with a 0.9bar rad cap the boiling point of engine coolant is roughly 105-110 degrees c but i am not sure what it is raised too with a racing rad cap set at 1.3bar. As for the water leaks caused by higher pressure is normal, when you modify any area of any car the modification will always highlight weakpoints or unnoticed defects, reason for this is that unless its a ferrari then the car has been built to a compromise to account for weaknesses for if every car manufacturer spent time ironing out all of a cars weaknesses then the car would not be cost effective to produce this is why there is always room for improvement withing virtually every car ever made.

Setright

0.9 up to 1.3 is a BIG step.

The 1.3 caps are "Upgrades" for later model cars, that run a standard cap at 1.1 Bar.

I would recommend fitting a 1.1 to your 0.9 system, and not going any higher.




You will not see any difference in temperature measurements, but as Rob has said, you reduce local boiling under hard loading.

dj219957

agree with the above, i didnt want to fit a 1.3 to my classic, so i went for a 1.1 and I have had no problems. I fitted it becuase I was having an issue with localised boiling.

sti69

iTrader: (1)

Good info guys