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Koyo has been in business for years. It began in Japan in 1956 and has been in North America since 2002. Koyorad owns all of their own factories. Nothing is outsourced - unlike many of their competitors who use contractors to build the rads.

Koyorad owns three factories in Japan, one in China, and one in Indonesia. All management comes from Japan and all inspectors are from Japan. Product that comes to North America comes to us from Indonesia. This plant, like their others, is an ISO 9001 factory.

The polished aluminum mirror finish, the weld quality, and the absolute perfect fitment is a testament of their high expectations and quality control. Koyorad is far more than just aluminum racing radiators. They build OE rated aftermarket radiators and Koyorad will be available in your local import dealers' parts department as an aftermarket rad. Collision shops often choose Koyorad - and insurance companies requiring OEM level equipment will often select Koyorad.
 
The welds. The straight rows. It is simply perfection.
 
There was no issue fitting the rad. Everything was exactly where it was supposed to be.
This Koyorad is absolutely going to help me on my path to reduced water temperature levels in hill climb and track events. Talking with Scott Oshiro at Koyorad, he points out that a Koyorad is only one part of the cooling system. Every part needs to be looked at and addressed. He also stressed that radiators needed to be cared for to be effective. It is actually pretty simple, just follow the Koyorad manufacturer's instructions. That includes understanding that coolant is a necessary corrosion inhibitor.
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Comments
MattAtPlaton
MattAtPlatonlink
Wednesday, May 30, 2018 3:34 PM
My friend has a Koyorad radiator on his S2000, and that little bung at the top starts to foam coolant under high temps. No biggie, not a huge loss, but should he be concerned in the long run?
Solovee2
Solovee2link
Thursday, May 31, 2018 5:20 AM
To get good readings from a non-contact thermometer, you will need to paint a small area with flat black paint. The reflective surface will provide false readings. Spray paint or paint marker works well.
Solovee2
Solovee2link
Thursday, May 31, 2018 5:29 AM
Also, make sure you know what size area you are measuring over. The farther from the object, the larger the area that you are obtaining readings from. The laser pointer is just a guide.
nissannx
nissannxlink
Thursday, May 31, 2018 6:56 AM
Matt, I'm not sure I understand. The bung that should be attached to the overflow tank? Does he not have it connected?

Solovee2, good points and I missed out on the black paint. My measurements were taken from approximately the same distance so that should not be a major distortion. But very valid points that I cannot replicate now.

My readers have heard me say before that I'm one of the least technical writers at MotoIQ. I'm neither an engineer nor a mechanic - just a guy who really enjoys cars! Especially my own. And then hopes my readers will appreciate that as I write about my experiences.
MattAtPlaton
MattAtPlatonlink
Thursday, May 31, 2018 12:46 PM
nissannx, it's the little one to the left (pic 4) that has a plug inside it, might be for installing a sensor to read coolant temps.
nissannx
nissannxlink
Thursday, May 31, 2018 7:09 PM
Matt, the one on your friend's S2K must be different than mine. The only openings are the rad inlet/outlet, the rad filler tube/cap, the overflow tube, and the drain plug. Everything else is a threaded bung for fans or something similar. I'm afraid I cannot answer your question.
nissannx
nissannxlink
Thursday, May 31, 2018 7:09 PM
That is, his S2K rad must be different than my SR20DET rad.
spdracerut
spdracerutlink
Friday, June 01, 2018 1:16 PM
@Matt, I haven't had any issues at all with the Koyo on Project S2000. Seems like maybe the bung just needs to be removed and new sealant applied?
Bradl3y76
Bradl3y76link
Friday, June 01, 2018 6:53 PM
How does the koyo perform compared to a Ron Davis
nissannx
nissannxlink
Saturday, June 02, 2018 9:12 PM
Brad, I'm afraid that is outside my knowledge base. Maybe someone else will be able to share a comparison.
Nitroracer
Nitroracerlink
Sunday, June 03, 2018 5:48 PM
I have been very satisfied with the Koyo in my Integra. I can run track days without ever having the needle go past the middle of the range. Its darn near twice the size of my OEM radiator.
warmmilk
warmmilklink
Monday, June 04, 2018 11:16 AM
@Nitroracer
not that I'm saying the Koyo isn't doing its job, but the "without ever having the needle go past the middle of the range" doesn't mean anything. the stock gauge is a 3 position gauge; cold, operating temp (usually a really wide range), and overheated. by the time you see the needle go past the middle, its too late, your engine is too hot. I mean you engine isn't gonna blow up if you go over it once, but doing it constantly or being in the upper range of what the oem gauge considers to be ok can substantially shorten your engine life.
Mike Kojima
Mike Kojimalink
Tuesday, June 05, 2018 12:19 AM
From racing an NX2K in IMSA many years ago, I can tell you that they are very hard to keep cool compared to a B13 or B14 Sentra, probably due to the aerodynamics and limited grill opening. It is interesting that Frank has been able to keep temperatures reasonable with a turbo engine under racing conditions.
MattAtPlaton
MattAtPlatonlink
Tuesday, June 05, 2018 10:16 AM
@nissannx, @spdracerut - thanks for your input! Unless it starts spraying coolant on the engine I don't think it's an issue.
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