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Hybrid Racing Performance Radiator Cap

In stock
Regular price $39.99
Product INFO
  • Vendor Hybrid Racing
  • SKU HYB-RAC-01-04
Style
In stock
Usually ships within 24 hours
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Returns accepted within 30 days of purchase

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 holds 16 PSI, and that isn't enough to keep coolant liquid when temps spike. The Hybrid Racing 1.3 bar radiator cap raises that to 19 PSI, which lifts your coolant's boiling point from around 120°C (248°F) to about 123°C (253°F). That extra 3°C 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, and your water pump can't move steam. You get cavitation — air pockets that stop coolant flow — and the engine overheats. Then you're looking at a warped head or a blown head gasket. A cap swap is a lot cheaper than a head job.

Why Higher Pressure Matters

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

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

These two cap styles are physically different and do not interchange. The style you need depends entirely on your chassis and year — it is not a preference. Put the wrong one on your radiator neck and it won't seal, and you can lose coolant and overheat before you notice the leak.

Features

  • High 1.3 bar (18.85 PSI) pressure rating vs. 1.1 bar (16 PSI) factory
  • Raises coolant boiling point from roughly 120°C (248°F) to 123°C (253°F)
  • Helps prevent cavitation and overheating on built or track-driven engines
  • Fits many Honda and Acura chassis
  • Available in two versions — Type-D and Type-F

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.