GrimmSpeed 1.3 Bar Radiator Cap - Subaru Universal

GrimmSpeed 1.3 Bar Radiator Cap - Subaru Universal

Highlights:

• Raises system pressure to 1.3 Bar for improved cooling efficiency

• Helps prevent coolant overflow during track or spirited driving

• Ideal for use with distilled water or water/antifreeze blends

• Increases boiling point to maintain stable engine temps

• Direct replacement for factory 1.1 Bar radiator cap

• Durable construction with upgraded materials

• Affordable performance upgrade

• Adds a clean, functional touch to your engine bay

 

Improve Cooling Efficiency for Performance Driving
When driving your Subaru in high-demand situations—whether on the track or during spirited backroad runs—your cooling system needs to work harder than in typical daily conditions. The OEM 1.1 Bar (16 PSI) radiator cap handles normal driving just fine, but when using distilled water or a water/antifreeze mix for better heat transfer, the lower boiling point can lead to expansion tank overflow after a few hot laps. Increasing system pressure helps raise the boiling point, keeping your coolant where it belongs and helping maintain consistent engine temperatures.

 

GrimmSpeed 1.3 Bar Radiator Cap: Affordable, Effective Upgrade
The GrimmSpeed High-Pressure Radiator Cap is a simple and cost-effective way to unlock your cooling system’s potential. With a 1.3 Bar pressure rating, it allows your system to operate at higher pressure safely—reducing the risk of boil-over and improving overall thermal efficiency. Built with quality materials and designed for durability, it also adds a refined look under the hood. Whether you're upgrading for performance or prevention, this cap is a smart addition to any Subaru cooling setup.

 

Quick Specs:

• 1.3 Bar/18.9 PSI Pressure Rated
• Increases Cooling System Efficiency
• Electro-coated Stamped Steel Construction
• Heavy-Duty Silicone Seal
• Understated Look Eliminates Ugly OEM Yellow Badge
• Manufactured in Japan

 

Fitments:

• All Subaru Radiators and/or Expansion Tanks
• Many (but not all) Nissan, Mitsubishi, Honda, Mazda, and Toyota Models

*fitment note - not suited to replace the 1-way "earless" cap on the STI radiators, but will work perfectly on the upper expansion tank!