Hybrid Racing High-Pressure Radiator Cap - 1.3 Bar (Type-D & Type-F)
Running your car hard at the track or in the summer heat? Your coolant's getting close to boiling and your factory 1.1 bar radiator cap's not holding enough pressure to keep it liquid. Our Hybrid Racing 1.3 bar radiator cap raises your cooling system pressure from 1.1 bar to 1.3 bar, which raises your coolant's boiling point. When your coolant boils, it turns into steam. Steam doesn't cool your engine. You get air pockets (cavitation) in your cooling system, your engine overheats, and you warp your head or blow your head gasket. Our 1.3 bar cap keeps your coolant liquid at higher temperatures so your cooling system actually works when you're pushing your car hard.
Here's Why You Need a Higher-Pressure Cap
Your cooling system's pressurized. When your coolant heats up, it expands and creates pressure inside your cooling system. Higher pressure raises the boiling point of your coolant. Your factory 1.1 bar cap holds about 16 PSI. Water boils at 100°C (212°F) at sea level with no pressure. At 16 PSI (1.1 bar), water boils around 120°C (248°F). Our 1.3 bar cap holds about 19 PSI, which raises the boiling point to around 123°C (253°F). That extra 3°C (5°F) of headroom matters when you're at the track or stuck in traffic on a hot day. If your coolant boils, you get steam and air pockets in your system. Your water pump can't pump steam effectively, so your coolant stops flowing and your engine overheats.
Type-D vs Type-F - Two Different Cap Styles
We make our radiator cap in two styles: Type-D and Type-F. They're different physical designs that fit different radiator neck styles. The cap style you need depends on your chassis and year. Type-D fits most 90s and 2000s Honda/Acura applications plus newer 11th gen Civics and DE5 Integras. Type-F fits older 80s/90s applications like EF Civics and DA Integras, plus newer 10th gen Civics and FK8/FL5 Type Rs. You can't use a Type-D cap on a radiator that needs Type-F, and vice versa. The cap won't seal properly and you'll lose coolant. Check your chassis in the fitment list below to see which cap you need.
Type-D Applications
Type-D caps fit most Honda and Acura models from the 90s and 2000s, plus some newer applications. If you've got an EG Civic, DC Integra, EP3 Civic Si, RSX, S2000, or Element, you need Type-D. Newer 11th gen Civics (2022+) and 2023+ Integra Base/A-Spec also use Type-D.
Type-F Applications
Type-F caps fit older 80s/90s Honda/Acura applications and some newer models. If you've got an EF Civic, DA Integra, BB Prelude, or EF CRX, you need Type-F. 10th gen Civics (2016-2021), FK8 Type R (expansion tank), FL5 Type R, and DE5 Integra Type S also use Type-F.
What You Get
- Hybrid Racing 1.3 bar high-pressure radiator cap
- Available in Type-D or Type-F (select correct style for your application)
- 1.3 bar (19 PSI) pressure rating vs 1.1 bar (16 PSI) factory cap
- Raises coolant boiling point for better cooling performance
- CNC-machined aluminum construction
- Anodized finish (multiple colors available)
Type-D Fitment
- 1990-1994 Honda Accord
- 1992-2015 Honda Civic (EG, EK, EP3, FG, FB)
- 2022+ Honda Civic Si/Sport/EX (11th gen)
- 1993-1997 Honda Civic del Sol
- 2003-2008 Honda Element
- 2007-2008 Honda Fit
- 2000-2009 Honda S2000 (AP1, AP2)
- 1994-2001 Acura Integra (DC)
- 2023+ Acura Integra Base/A-Spec (DE5)
- 2002-2006 Acura RSX (DC5)
- 2004-2008 Acura TSX
Type-F Fitment
- 1988-1991 Honda Civic (EF)
- 2016-2021 Honda Civic (10th gen, FC/FK)
- 2017-2021 Honda Civic Type R FK8 (expansion tank)
- 2023+ Honda Civic Type R FL5 (expansion tank)
- 1988-1991 Honda CRX (EF)
- 1992-2001 Honda Prelude (BB)
- 1990-1993 Acura Integra (DA)
- 2024+ Acura Integra Type S (DE5)
Note: Make sure you order the correct cap style for your application. Type-D and Type-F are physically different and they're not interchangeable. If you order the wrong style, it won't fit your radiator neck and you'll have to return it and order the correct one. Check your chassis and year in the fitment list above before you order. Inspect your radiator neck for cracks or damage before you install a new cap. If your radiator neck's cracked, the cap won't seal properly and you'll leak coolant.
