Hybrid Racing Performance Radiator Cap

Hybrid Racing High-Pressure Radiator Cap - 1.3 Bar (Type-D & Type-F)

If you're pushing your car at the track or crawling through summer traffic, your factory 1.1 bar radiator cap is the weakest link in your cooling system. It's holding 16 PSI and that's not enough to keep your coolant liquid when temps spike. The Hybrid Racing 1.3 bar radiator cap bumps that to 19 PSI, which raises your coolant's boiling point from around 120°C (248°F) to about 123°C (253°F). That extra 3°C (5°F) sounds small, but it's the difference between your cooling system doing its job and your coolant turning to steam.

When coolant boils, it becomes steam. Your water pump can't move steam. You get cavitation - air pockets that stop coolant flow - and your engine overheats. Then you're looking at a warped head or a blown head gasket. A $30 cap swap is a lot cheaper than a head job.

Why Higher Pressure Matters

Your cooling system is pressurized by design. As coolant heats up and expands, that pressure builds inside the system. The radiator cap is what controls how much pressure it holds before it vents. Higher pressure = higher boiling point. Your factory cap is rated 1.1 bar (16 PSI) and gets the job done for stock driving. But if you're running harder, sitting in traffic with a built motor, or you've already upgraded your cooling system with a bigger radiator, the factory cap becomes your bottleneck. The Hybrid Racing 1.3 bar cap holds 19 PSI and gives you that extra cushion of protection when it counts.

Type-D vs Type-F - Pick the Right One Before You Order

These two cap styles are physically different and they don't interchange. The cap style you need depends entirely on your chassis and year - it's not a preference thing. Put the wrong one on your radiator neck and it won't seal. You'll lose coolant and potentially overheat before you even notice the leak.

Type-D covers most 90s and 2000s Honda/Acura platforms - EG Civic, EK Civic, EP3 Civic Si, DC Integra, RSX, S2000, TSX, Element - plus the newer 11th gen Civics (2022+) and 2023+ Integra Base/A-Spec (DE5).

Type-F covers the older EF-era stuff and a handful of newer applications. EF Civic, DA Integra, EF CRX, BB Prelude - and also the 10th gen Civic (2016-2021), FK8 Type R expansion tank, FL5 Type R expansion tank, and DE5 Integra Type S.

Check the fitment list below before you order. If you're not sure which style your chassis takes, match your year and chassis code to the list - don't guess.

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)

One thing to check before you install: inspect your radiator neck for cracks or damage. A new high-pressure cap on a cracked neck still won't seal, and you'll be chasing a coolant leak instead of enjoying the upgrade. Takes 10 seconds to look and it's worth it.