SKU: 56829653886

Koyo Hyper Cap, (Fits All Listed Koyo Radiators), 1.3 Bar, Red Racing Radiator Cap

Sale price$53.10 Regular price$59.00
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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3

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Description

Koyo Hyper Cap, (Fits All Listed Koyo Radiators), 1.3 Bar, Red Racing Radiator CapPart # SK C13 (RED) Deep plunger fits all Koyorad radiators w filler necksPart # SK D13 (Bottom photo BLUE) Shallow plunger fits FR S, BRZ, and GT86 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

Part # SK-C13 (RED) Deep plunger fits all Koyorad radiators w/ filler necks
Part # SK-D13 (Bottom photo BLUE) Shallow plunger fits FR-S, BRZ, and GT86

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?

It’s simple.  When water is pressurized, its natural boiling point is increased.  Most modern vehicles are equipped with a 0.9 Bar pressure cap.  Koyorad’s 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.

 


Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 56829653886

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Krista Miller
Charlottesville, US
★★★★★ 5
Very nice quality and affordable
Size: 8.5, Color: Black
Great quality and affordable! Comfortable and look great! Would definitely recommend.
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Reviewed in the United States on September 20, 2025
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Mitch
Bozeman, US
★★★★★ 4
Snazzy Looking and Cost-Effective Dress Shoes
Size: 9.5, Color: Black
The shoes fit great and look very nice. They keep their shine and comfortable. I would say there are two drawbacks. 1. When you put them on, the tongue pushes up far and you have to pull it back. 2. There is little to no arch support and would recommend insoles if you have any foot condition. I haven’t had these through a snowy and salty winter.
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Reviewed in the United States on August 7, 2025
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Shan
Dallas, US
★★★★★ 5
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Size: 11, Color: Brown
Great quality, the material and the durability is great. A year after and it still looks great
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Reviewed in the United States on January 16, 2026
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Aman
Pawtucket, US
★★★★★ 5
Full of comfort & style!
Size: 8.5, Color: Black
Very comfortable! Stylish! Value for money!
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Reviewed in the United States on November 14, 2025
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Amazon Customer
Lake Worth, US
★★★★★ 1
Tight fit
Size: 9, Color: Black
Shoes way to tight on toes!
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Reviewed in the United States on May 19, 2026

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