Engine radiator Koyo or KOYORAD

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Reviews found: 0
KOYORAD Engine radiator
Schoggi_23
Rating 5.0
  • Overheating:

Ive had my car enter limp mode multiple times on a high 80 track days. Coolant temp would spike to the 3/4 marks. When I upgraded the radiator to a koyorad I never had issues again.

Pros: no more limp mode, stable coolant temp
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KOYORAD Engine radiator

I am here to say the Koyorad fits perfectly fine with Cobb’s charge pipe. The upper radiator hose had to be completely taken out to get the pass side fan installed but no trimming or cutting of fan shroud. The radiator looks amazing as well.

Pros: perfect fitment, amazing look
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KOYORAD Engine radiator

Experienced a full separation of the top (and possibly bottom) plastic from the aluminum portion - would leak about as fast as I could pour it in. Replaced with Koyorad A2807 from RockAuto.com for $104 plus tax and shipping. Nominal time to repair for a non-mechanic is probably 4-to-6 hours - call it a day project.

Pros: fixed severe leak, cost-effective
Vehicle: Nissan
Mileage: 531082 km
Part number: A2807
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Koyo Engine radiator

My '09 had the bad number, so I bought a Koyo radiator and spent an afternoon swapping it all. That was ~6-7 years ago.

Pros: easy to swap, long-lasting
Vehicle: Nissan
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Koyo Engine radiator

I just bought a koyo and it's a bit of a learning curve installing it. It took a few hours to burp the system of air but now I'm chasing small leaks. The OEM cap doesn't fit the radiator

Cons: small leaks, OEM cap doesn't fit, difficult installation
Vehicle: Honda S2000
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Koyo Engine radiator
SchrodingersLunchbox
Rating 0.5
  • Overheating:
  • Leaks:

Roughly 12 months ago, I upgraded the radiator on my 2000 Series 8 (~65,000km/40,000mi) to a Koyo R1443N 48mm N-Flow. The coolant seals blew because the radiator's design allowed air to accumulate, creating hot-spots and leading to seal failure. My water temps never exceeded 90C. After a rebuild, a valve was installed on the radiator elbow, making it quicker to bleed the system, and water temps are now around 77C, about 10C cooler than before. The Koyo radiator's design prevented proper bleeding of the coolant system, causing seal failure.

Cons: design flaw, air accumulation, seal failure
Vehicle: Mazda
Mileage: 65000 km
Part number: R1443N
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