Cap, Radiator (1.3 bar/19 PSI) KOYORAD - EVO4-9, EVOX, Ralliart Lancer, Airtrek

Koyorad Radiator Cap 1.3 Bar (19 PSI) – EVO4-9, EVOX, Ralliart Lancer – Made in Japan for precision fit and reliability. Maintains optimal cooling system pressure for improved performance and protection against overheating.

Using a higher pressure radiator cap, like 1.3 bar (19 PSI), helps because:

• Raises boiling point of coolant – Allows the cooling system to run hotter without boiling over.

• Improves cooling efficiency – Maintains consistent pressure for better heat transfer.

• Reduces risk of overheating – Especially beneficial in performance or high-load driving.

• Supports upgraded cooling systems – Ideal when paired with performance radiators or track use.