You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
If you have any problems with the registration process or your account login, please contact contact us.
0.4 bar , basically it is the pressure rating of the cap. it wont pass any coolant into the expansion tank until the pressure in the system reaches that pressure.
I personally would stick to the factory fitted 0.9 bar pressure cap….
The 1.3 bar cap is meant for use in motorsport & would allow for higher coolant temps to be reached without running the risk of the coolant boiling and/or being forced out of the system.
I wouldn't really recommend them for use on a road car (especially older ones) as it increases the load on the cooling system components to almost 1.5 times the norm, which in turn will lead to an increased risk of the hoses or radiator failing, coupled with the fact that the factory fit a 0.9 for a reason and there would be no benifit by running a 1.3.
I wouldn't really recommend them for use on a road car (especially older ones) as it increases the load on the cooling system components to almost 1.5 times the norm, which in turn will lead to an increased risk of the hoses, radiator or head gasket failing,
go for a 1.1 bar one if you really must upgrade. thats what the 97- cars run.
That's not particularly helpful advice. On an old car with fibre HG's, raising the coolant pressure without good reason in this manner is unnecessarily tempting fate. One of the reasons the later cars have a higher pressure cooling system is because they have MLS head gaskets instead of the fibre ones.
I upgraded to a 1.3 with the forge header tank on MY95 STi. BUT I also have a larger ally rad, samcos and Zero Sports Thermostat. Just get a new OEM one, they're pretty cheap !
i run a 0.9 cap and have a forged engine build im wondering if i should swap to a 1.1 bar one as my header tank wil never stay full it will alsway stay an inch or so from the top ive always put this down to wher eits runnign almost 400bhp the temp of the water will be increased so it get rids of what it does not need and find its level
stick to the original rating for a standard engine, if want to improve the cooling system, then change an uprated thermostat ( which open at lower temp).
Coolant caps
, basically it is the pressure rating of the cap. it wont pass any coolant into the expansion tank until the pressure in the system reaches that pressure.
