Moss Miata


Koyo 37mm Radiator

[4/20/2011] Reviewed by: Tommy -

Applicable to: '99-'05 '06+ 1.8 liter

Koyo 37mm Full aluminum radiator

Hello you, the reader. I'll keep this short and sweet. This is a good radiator. The only issue I've had is with the plastic drain plug. Seepage after spirited ride... Not much or anything to worry about. Replace the seal or buy a new plug ($10). Nothing negative from an Arizona driver with 200k mi. PS. Kudos to you for researching your future project!

Over 30 minutes to remove completely

Koyo 37 mm radiator from Good-Win Racing

[9/6/2010] Reviewed by: Conrad Zumhagen -

Applicable to: '90 - '97 1.8 liter

Koyo 37 mm all-aluminum radiator from Good-Win Racing.

and Excellent product, good quality. Really did "drop in"to my '94, fitting nicely without interfering with A/C & P/S hoses, plus the bigger Flyin' Miata front roll bar. Needed to remove the circlip-retained pins from the original/stock unit and install them in the new one, since they were not supplied (no problem). Used new stainless 10mm fasteners for the fan mounts, since a couple of the old ones broke while removing them. Thanks to Brian Goodwin for his personal consultation & fine service.

Recommended for all boosted engines (mine has an MP62 Moss supercharger), and the stock radiator seemed insufficient, since the temp. gage was heading toward the top at recent HPDE track events. Just did another day at the track with the new radiator, and the car "kept its cool" just fine.

Over 30 minutes to remove completely

Koyo 37mm radiator

[3/23/2010] Reviewed by: Jon L. Jacobi

Applicable to: '90 - '97 1.6 liter

All aluminum, aftermarket increased capacity radiator

I must say I was extremely happy with this product when I bought it. My temp gauge never read over 1 o'clock, even when driving through the Arizona with 115 degree heat. However, about two years ago I started having mysterious problems overheating. I'll spare you the long series of failed parts and misdiagnosis. I simply could not believe that my $300+ radiator would develop a core leak but it did. The shop that pressure tested it said there was virtually no damage to the radiator so this must've been a defect. Unfortunately, thee warranty was only 18 months, probably because racers use it, but I was well out of it. So $300+ down the drain. Koyo has a good rep, and I'm surprised about the whole thing, but a radiator that expensive should have a lifetime warranty for defects. I'm not necessarily recommending against it as it worked beautifully at first but I'm going cheap eBay this time and pressure test up front. At least that way I'll only be out $100 if it fails.

Good, nice welds, but needs a longer warranty.

Under 30 minutes to remove completely

Radiator - Koyo 37mm

[4/23/2007] Reviewed by: Timothy Chen -

Applicable to: '90 - '97 1.8 liter

Koyo 37mm Alum. radiator from Good-Win Racing

After a slow leaking filler neck problem from my G&L(see review) radiator for almost 3yrs, I finally purchased a Koyo 37mm from Brian Goodwin and I should have done this in the first place not trying to save money and not have the the quality I need. Its a high quality product and it fits perfect. the welds are strong and it cools better than the G&L. The price is right at $369+ shipping and I regret I did not do this sooner.

A quality product with a fair price.

Under 30 minutes to remove completely

KOYO 37MM AL Radiator

[7/17/2005] Reviewed by: Tony Comer -

Applicable to: '99 + 1.8 liter

KOYO 37MM Thick dual core aluminum radiator

I replaced a KOYO 55MM Thick unit because of poor cooling at low speeds. The 37MM with stock cooling fans is perfect, but still gives additional cooling. The fin spacing appears to be slightly larger than the 55MM unit so I get better air flow at lower speeds. AC works perfectly again at lower speeds. The 55 works great for higher speed driving, but the 37 seems like a better choice for a street machine.

If you are driving on the street with some autocross and track usage and want to keep your AC and stock fans, the KOYO 37MM is a great alternative to the other units out there at a more affordable price.

Under 30 minutes to remove completely

Koyo Radiator

[5/16/2004] Reviewed by: Tony Comer -

Applicable to: '99 + 1.8 liter

Larger aftermarket all aluminum radiator.

Definitely provides additional cooling for Florida temperatures and spirited driving.

Installation was generally as you would expect with one exception. I had to relocate the A/C condenser on the front side of the mounting brackets to gain an extra 3/8-1/2" for clearance with the Koyo. (Since the weld nuts are now on the attachment side be sure to install backup nuts on the back side just in case the weld nuts should ever break loose.) Wasn't that difficult just took a little time and care. Be sure to check this carefully so you don't damage your new Koyo when fitting.

Over 30 minutes to remove completely

Back to Product Reviews 3 July, 2011

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