I ordered a koyo n-pass radiator for my car because it seamed like it would be the best bang for my buck, and it looked like a descent fit. Numerous problems were encountered along this process costing me considerable time and money. Here is the abridged story:

1. Got the radiator it had scratches all over it. Polished it was not.

2. Tried to bolt on side brackets, and they were ~3/4" to close together.

3. Called koyo and they wanted to charge me shipping to send back there defective product, and wait two weeks to send it back and have them send me one. Decided for the time it would take to get a second one, I would just modify my brackets.

3. Tried to put it into the car, and the radiator was half inch to wide. I was able to force the rubber mounts to move the 1/4."

4. Tried to fit fan shroud around the pipes and I would have to make heavy cuts to my shroud didn't do this yet (thank goodness).

5. Once the radiator was in, my factory air box would not even fit.

6. I noticed that the bleeder screw was kind of high so I closed the hood and the top of the radiator hit the hood when it was not even closed. if I lowered it any, it would hit my sway bar. What the hell were they thinking?

At this point I had had my car unable to run for a week, taking up space in the shop it was in. Each morning I had to push it outside and back in at night.

Needless to say I am pissed. In no point in the calling koyo and my distributor did anyone tell me anything but it should fit in the factory location. I knew since it was bigger I would take a little modification to the fan shroud but that was it. But to be this far away from the factory mount location is just stupid. Koyo still wants to charge me $50 to ship it back to California! That's just a great business plan: "lets make something that doesn't fit then send it out to everyone and make them ship it back to us" other guy, "ya that will show them for expecting quality!"

As of yesterday, corksport is out of radiators until Jan. 16, awr no longer makes them, and Ron Davis is in a transition and wont have any until some time in January. My old radiator is out of the car with a leaking bleeder screw and won't be going back in. So right now my car is dead until I find a new source for radiators. It looks like OEM or Rock Auto brands are about the only thing possible now.

Any Ideas? What ever happens, The shop and I will never order another thing from koyo. $350 for that pos, ya right.
Pics to come later.

 

That blows ***. Sounds like a shitty company. I'd find a used oem radiator here on the forum somewhere local where you can pick it up and have it to get your car running.

 

the stock mounts need a touch of drilling.
Other than that the Fit on my S4 was fine.

It's an aftermarket part and they make rads for all types of vehicle.,I don't think they wanted to spend too much on R and D.

 

I had a koyo in my t2 it fit perfect it literally took me 30 min to install, do you have the right radiator brackets? S4 and s5 are different.

 

I've had good luck with CSF radiators - they're not as fancy looking or shiny as the koyo, but they're a perfect fit and have worked well for me on the track.

 

I sold a ton of them back in the day and never had a problem...bummer
Csf makes a racing radiator in the 230-260 range

 

I haven't had any problems with mine. Dropped right in.
Almost sounds like you have the wrong radiator or something.

 

I think what happened is they tried to cut costs and changed the design. For instance on their website the schematics said the welded on nuts on the side were m12 and they were like m6 or 8. I know a lot of them worked, but this one was so off. The part# on the side of the box was the correct # for the n-pass. It was bad quality control. On one side the mounting points were a quarter inch farther apart than the other. I had a s5 radiator in my car and that's what the brackets came off of. I tried at first reaming out the holes to make them fit but was still a quarter inch off and I had hit the shoulder on the side. That's when I cut the brackets up a little and welded them up.

 

interesting ive generally heard good about koyo products

 

maybe you got a bootleg radiator

btw- are they advertised as POLISHED?

 

^They should be. This is where I purchased mine.
Radiators (86-91 RX-7)

That's strange. Not that I'm sticking up for Koyo or saying nothing could ever go wrong but their products are typically reputable.
Where did you order the radiator from?
Do you have any pics of it by chance?

 

Sure you didnt grab an s4 rad or don't have the mounts correct?

 

The N flow is an S5,and when you use the S4 rad brackets it won't fit the new rad correctly.
You need to drill the bracket as the Mounting points are off from the holes on the bracket.

 

The car is a 1989 s5, so unless the previous owner replaced the rad with a s4 rad then no, I don't have s4 brackets, I have s5. I will post pictures when I get home to show what I'm talking about. The main thing was it hit the hood when I got it bolted in, and would have hit my sway bar if I somehow lowered it any.

 

Get some pics of the lower mounting points

 

Weird. Get that crap replaced! Koyo is usually a good company, from what I've heard. But hey even the good guys screw up every once in a while.

 

I have heard good things about koyo before, but they really let me down. The piece is good quality building, just put the nuts in the wrong place. Here are some of the pictures of the fitment. I don't doubt that they made a well fitting product in the past, but this one was not. It was defective. Hopefully they will figure this out and go back to making quality products.

As you can see, with one bolt in (after reaming out the holes about a 1/4" each) the pass side bracket would still not allow me to even attempt to start the bolt. If I drilled it any farther it would strike the shoulder that is right above the hole not allowing me to turn the bolt.

 

Have any pictures of the radiator itself, just trying to see if you got the real thing or not.

 

I have an N-flow on my S5 racecar. It fit without any issues whatsoever. No it does not work with the stock intake tube that routes across the fan shroud and the fan shroud does not work without some spacers (same as many other radiators). But, beyond that, it fit really well and it is a far superior design for heat transfer than any single pass...

I'm surprised to hear of such trouble.

 

Yeah i am also having problems with mine. The one i have has stared leaking at the welds.

 

I figured that I would have a little fitment issues such as modifying the fan shroud, but nothing like this. My main beef was nowhere on koyo or works concepts said this was anything but a direct fit. Koyo Radiator - R-Series - Works Concepts Inc - The leading source for JDM and European performance parts and accessories. Here I Quote: "All Koyorad R-Series All Aluminum Radiators are Nocolok brazed, designed as a factory fit, direct bolt in with no engine modifications necessary, and retain mounts for the stock fan shrouds and fans.All Koyorad R-Series All Aluminum Radiators are Nocolok brazed, designed as a factory fit, direct bolt in with no engine modifications necessary, and retain mounts for the stock fan shrouds and fans. That is what is annoying me.

Damn the expense I'm returning mine today, I got a bunch of pictures and I'm sending it back to works concepts for a refund. Plus the $50 shipping to send back a defective product. Glad I didn't take it farther with the modifications to stuff to make it fit if it was just going to start leaking.

 

I'm in a bad way needing a radiator. No one has any until mid January.

Corksport: out of stock till January 16
Awr: Out of production
Ron Davis: out of stock until January or February sometime
CSF: Says both the oem and the all aluminum are out of stock until further notice.

Who else has these stupid things?!?!?!

 

if your ok with stock for now.... More Information for SPECTRA PREMIUM / COOLING DEPOT CU1144

or More Information for PRO 8011144

thats for s5 TII, just search rock auto if you are N/A, sorry I didn't look

 

My s5 koyo fit perfect, it sounds possible your car has had an s4 radiator swapped in at some point.

Its also possible you just got really unlucky and it was a bad radiator missed by quality control but even a quality issue shouldn't require your brackets be modified as much as it looks like you had to.

I'd suspect the wrong series.

 

You could always try a wtb ad in the for sale section.