I run a 190 in my Honda v6 swapped Miata with a koyorad and it never overheats even in hot weather
Pros: never overheats, even in hot weather
Vehicle:
Mazda
Reviews of Koyo parts For Business
Average Rating
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The manufacturer's average rating is calculated based on ratings of all its spare parts. It determines the place in the manufacturer ranking
4.4
Manufacturer Ranking
#23
57
Spare Parts
1
Country
Japan
Website
koyo.eu
Spare Parts
Comparisons
I looked at what I bought like 165k and it was KOYO Radiator A1998 for $175 and I'm like 100k miles later and it still looks good. I just wanna change it for preventative maintenance since I'm gonna have my mechanic add the external cooler
Pros: still looks good, long lasting
I run a Koyo 37mm radiator... and I will hit 200+F under hard driving. Under normal driving, my coolant temps are in between 178-185F.
Pros: good normal driving temps
Cons: high temps under hard driving
Vehicle:
Mazda
Koyo N flow. Only rad you’ll ever need. Even though you want to keep it “stock” the OEM style plastic crimped end tank design is a time bomb and should be avoided.
Pros: reliable, durable
Vehicle:
Mazda
Koyo is definitely one of the best available as a stock replacement. They make 2. The n flow is a little harder to fit but is “better”.
Pros: best replacement, better performance
Cons: harder to fit
Vehicle:
Mazda
Koyo rad is top tier, as I’ve used them on all my drift builds.
Pros: top tier, reliable for builds
Held out for the koyorad and it's the same size as stock and went in with no troubles.
Pros: same size as stock, easy installation
I have a koyo radiator in my na6 with stock fan on it and it has no clearance issues. Probably wasn’t necessary for me currently but I’m going turbo after I spend more time driving it na so figured why buy twice and just went for the koyo.
Pros: no clearance issues, good for upgrades
Vehicle:
Mazda
My 2012 Sti with a Koyo aluminum radiator makes plenty of heat even down below 0°F
Pros: makes plenty of heat, effective in cold
Vehicle:
Subaru
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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