All Aluminum Koyo / Mishimoto Radiator Review

I know some of you have read the 'Koyo vs. Mishimoto' threads out there, but I wanted to add my own 2 cents since I've owned both of those radiators. The radiators purchased were for 94-01, manual integra's. However, they can still be used on automatic's as long a transmission cooler is used.


MSRP: $393.12
Specs available at koyorad.com


MSRP: $280.00
Specs available at mishimoto.com

The reason I decided to go with an all aluminum radiator was for the mere fact that my oem radiator had reached it's life and had cracked. Why not purchase something that should outperform an oem radiator and improve cooling right?

Size:
If I were to compare the koyo and mishimoto side by side, it would seem that the koyo was a bit larger and I had a bit of trouble getting it in the engine bay. I was however able to use my stock fans and bolt them on to the koyo radiator. Mishimoto's website however states oem fans will not work with it's radiator.

Build:
Both aluminum radiators look quite durable and seemed to be able to handle the cars cooling efficiently. I cannot speak for turbo set ups or superchargers as I have only tried these radiators on a N/A car. When I drive, I do the occasional spirited driving at best.

Problems w/Koyo:
The koyo radiator was purchased June 2006 and within a year, there seemed to be coolant spilling from the engine bay. Had it checked out and it had sprung a leak so I got it welded. Early 2009, there seemed to be another leak coming from it. I was getting frustrated by it and decided it was time to either go back to oem or switch to another radiator. It is also possible that the koyo radiator I received was just a defective model that just wouldn't last. If an oem radiator can last for 10+ years, so should any aftermarket radiator right?

Problems w/Mishimoto:
Well I opted for a Mishimoto radiator in May 2009 next since there were good deals on them and gave it another go for an all aluminum radiator. After a month or two of driving, there was coolant spilled in the engine bay once again. Just my luck? The radiator hoses were all brand new by the way so I knew that those weren't giving out. Turns out the mishimoto radiator caps were faulty and wouldn't hold the pressure. I sent them an email about the problem and they sent me a new cap right away for free. So far, no further problems.

Currently I'm still running the mishimoto radiator with 2 slim aftermarket fans, a new radiator cap and it's running like a champ. And like I said before the mishimoto is not as thick as the koyo so dropping it in was a breeze. Cheers.8)
 
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blaketeg

I <3 Boost
good review man :)

getting my mishimoto here pretty soon
 


Very nice... I have yet to try a mishimoto rad (because they are still building one for the rx7) but I have used koyo and fluidyne and I say both radiators are GREAT. however u pay alot more for the fluidyne.

If mishimoto makes a rad for my RX7 and he makes me a killer deal I may swap my fluidyne out for it... MAYBE

I've also heard that there is a bit of "fab" u have to do when using the rad fans with a mishimoto rad..


GREAT writeup.
 


phatintegra

Banned
I'm running the Fluidyne with the trans cooler since 2004 no issue except the rad drain wing bolt broke from the finger tab, so I can't take drain bolt out. Fluidyne sent me a replacment one for free.
 
I'm running the Fluidyne with the trans cooler since 2004 no issue except the rad drain wing bolt broke from the finger tab, so I can't take drain bolt out. Fluidyne sent me a replacment one for free.

Yeah honestly I think the Fluidyne radiator is superior to the koyo and maybe the mishimoto however again u pay for what u get deff
 
Very nice... I have yet to try a mishimoto rad (because they are still building one for the rx7) but I have used koyo and fluidyne and I say both radiators are GREAT. however u pay alot more for the fluidyne.

If mishimoto makes a rad for my RX7 and he makes me a killer deal I may swap my fluidyne out for it... MAYBE

I've also heard that there is a bit of "fab" u have to do when using the rad fans with a mishimoto rad..


GREAT writeup.
Fab? Well I purchased 2 universal slim fans, I believe a 10" and a 12" similar to this:


All I had to do was cut the fan wires and crimp them to the connection on the car but that was about it. I'm not that knowledgeable on fluidyne but they seem like a legit company.
 

shot-out

New Member
i still have my Mishi in the box & it's the same as the OP's & I too have a 94 Teg w/2-slim fan kit: can u still use ur A/C with the MishiRad ?? thanx for that review BTW and just went on MishiRad site & it shows the integra Radiator with A/C components still installed under the hood, so yeah I think it's compatiable
 
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redrocket

New Member
The size of the radiator is perfect, I have a full size with dual slim fans. I also have AC, and a turbo setup!
 
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