PRODUCT DETAILS
FK8 Civic Type R Water Pump Upgrade Kit - Genuine Honda FL5 Pump
The FK8 Civic Type R runs hot on track, it's a known trait of these cars, and the factory water pump is part of why. This kit upgrades it with the genuine Honda water pump from the newer FL5 Type R, which flows 12% more coolant than the stock FK8 pump. More flow means lower coolant temperatures on hard pulls and faster cooldown off throttle, which matters most on track-focused and sleeved builds pushing serious heat. It's a genuine-Honda upgrade that works all the time, not just past a temperature threshold.
Why The FK8 Needs More Coolant Flow
Worth understanding, because it's the reason this upgrade exists.
The FK8's K20C1 makes real power and real heat, and on track, back-to-back pulls, long sessions, hot days, the cooling system can struggle to keep coolant temperatures where you want them. Rising coolant temps lead to the ECU pulling timing to protect the engine, which costs you power exactly when you're trying to make it, and on a hard-run or sleeved engine, sustained heat is a genuine reliability concern.
The water pump is what circulates coolant through the engine and radiator, and more flow means the system moves heat away faster. The FK8 pump is adequate for a stock street car; it becomes a limitation when you're asking more of the car.
The FL5 Pump Flows 12% More
This is the upgrade, and it's an elegant one.
When Honda developed the FL5 Type R, they improved the water pump. This kit takes that genuine Honda FL5 pump, an uprated component over the FK8's, and fits it to your FK8. You get 12% more coolant flow, which has been dyno-tested and proven to lower coolant temperatures during demanding pulls and speed up cooldown when you lift.
Because it's a genuine Honda part that Honda themselves designed as the improved version, you're not gambling on an aftermarket pump's quality or longevity, you're fitting Honda's own better pump.
It Works All The Time, Unlike A Low-Temp Thermostat
An important distinction from the other common cooling upgrade.
A low-temp thermostat only does something once coolant reaches its opening temperature, it lowers the threshold at which the thermostat opens, but it doesn't increase how much coolant the system can move. It's threshold-based.
This pump upgrade increases flow itself, constantly, regardless of temperature. More coolant is moving through the engine at all times, which means more consistent cooling across every condition rather than only kicking in past a set point. The two aren't mutually exclusive, but the pump addresses the actual flow capacity of the system, which a thermostat can't.
A Complete, Genuine-Honda Kit
Everything needed to do the job, all genuine Honda.
- Genuine Honda FL5 water pump assembly
- Genuine Honda water pump pulley
- Genuine Honda auxiliary belt
- Genuine Honda pulley hardware (stainless)
The kit includes the pulley, belt, and hardware alongside the pump, so you're not sourcing the supporting parts separately, it's a complete, straightforward install with genuine components throughout.
Also A Direct Replacement For FL5 And Integra Type S
Worth noting for those cars.
Since this is the genuine FL5 pump, it also serves as a direct replacement water pump for the FL5 Civic Type R and the DE5 Integra Type S. On those cars it's a straight OEM replacement rather than an upgrade, there's no additional cooling benefit since it's already their factory pump, but if you need to replace the pump on an FL5 or Integra Type S, this is the correct genuine part.
Who Should Grab This
This is for the FK8 Civic Type R owner who tracks the car or runs it hard, especially on a sleeved or built engine, and wants lower, more consistent coolant temperatures from a genuine Honda upgrade. 12% more flow, dyno-proven cooling gains, constant rather than threshold-based, and a complete genuine-Honda kit. Keep your coolant temps in check, protect the engine, and stop losing power to heat on the third lap.
Fits: 2017-2021 Honda Civic Type R (FK8) as a cooling upgrade. Also a direct OEM replacement for 2023+ Civic Type R (FL5) and Integra Type S (DE5). Pump: genuine Honda FL5, 12% more flow than stock FK8. Benefit: lower coolant temps on pulls, faster cooldown, constant (not threshold-based) improvement. Includes: FL5 water pump, pulley, auxiliary belt, and stainless hardware, all genuine Honda. Best for: track and sleeved FK8 builds.