Koyo Radiator Cap (Koyo Radiator)

Vehicle Fitment:

  • 2002-2007 WRX
  • 2005+ STI

This may fit other Koyo Radiators for different makes and models

SKU
SK-C13
Now Only $24.99 Regular Price $30.00

Koyorad is a Japanese company established in July of 1956 as Ejiri Radiator in Nagoya, Japan (Aichi Prefecture) as a radiator repair shop. Twelve years later in 1968, Ejiri Radiator established a radiator and oil cooler factory in Nagoya. We then separated our production facilities from our repair facilities and began manufacturing radiators. Two years later in 1970, Ejiri Radiator was renamed to Koyo Radiator Manufacturing and began expanding to branches all over Japan. Koyorad quickly developed into an industry leading Aftermarket Radiator Supplier worldwide. With over 57 years of radiator design and manufacturing experience, founder Mr. Ejiri and son soon gained interest in automotive racing.

Extract every ounce of cooling efficiency from Koyorad All Aluminum Performance Radiators with a genuine Koyorad Hyper Cap! This Koyorad Hyper Cap withstands an increased valve pressure rating of 1.3kgf/cm2 (1.3 bar) (18.9 psi) (130 kPa) which increases the boiling point of water and relieves high performance engines of excessive heat. A genuine Koyorad Hyper Cap is recommended for use with every Koyorad All Aluminum Performance Radiator (when applicable). This Koyorad Hyper Cap is manufactured in Japan from high quality components to ensure longevity and performance from your Koyorad Racing radiator.

Why is increased Pressure Better?

Its simple. When water is pressurized, its natural boiling point is increased. Most modern vehicles are equipped with a 0.9 Bar pressure cap. Koyorads Hyper Cap is rated at 1.3 Bar which increases the boiling temperature of your coolant to 267.80 degrees Fahrenheit. That is nearly a 56 degree increase over water's normal boiling point. By increasing the boiling point of water, an engine's cooling system will have the added heat capacity, maximizing performance under ever-changing racing conditions.

**Koyo deep plunger radiator cap fits all Koyorad radiators w/ filler necks (Red)



warning_symbolWARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.

More Information
SKU SK-C13
Product Type Engine
Engine Cooling Systems
Brand Koyo Radiators
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