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Evo 7/8/9 Radiator Caps

Evo 7/8/9 Parts
Back to Radiator & Cooling

The stock pressure of the Evo 7/8/9 caps is 1.1 bar (~15psi). Higher pressure 1.3 bar (~18psi) caps are widely used with aftermarket radiators. 1.5 bar caps are available but generally only used with high HP track cars. Upgrading to a higher pressure cap can raise the boiling point of your coolant. The cap spring opens at the PSI rating of your cap and coolant moves to the overflow tank, returning when the pressure is back to normal.
Evo 7/8/9 Parts
Back to Radiator & Cooling

The stock pressure of the Evo 7/8/9 caps is 1.1 bar (~15psi). Higher pressure 1.3 bar (~18psi) caps are widely used with aftermarket radiators. 1.5 bar caps are available but generally only used with high HP track cars. Upgrading to a higher pressure cap can raise the boiling point of your coolant. The cap spring opens at the PSI rating of your cap and coolant moves to the overflow tank, returning when the pressure is back to normal.