Hey guys........
Since there have been so many discussions about this, I didn't want to do a search that would take 10 years.
In low to mid 90 degree weather, my stock rad w/fans on reads 86 C on my PFC in traffic.....sometimes up to 90 if i get on it a little. I always look to better things but I've heard stories about upgrading the rad doesn't improve or may even worsen the temps. I have a Greddy front mount so is this true for only front mounts? I also heard the Koyo's fit better than the Fluidines as well. Any advice would help............Thanks in advance.........

 

I don't see anything wrong with those temps, especially with a FMIC but I understand that the Fluidyne is a better drop-in and the Koyo requires some minor trimming.

 

Not sure where you've heard that, not on this forum. Most of the posts I've seen, people are running several degrees cooler with an upgraded rad. Regardless of which position it's in. I think you are referring to the fact that most people see an increase in temps when going to a FMIC.

Also, you have it backwards, the Fluidyne installs easier and will have less fitment problems than the Koyo.

 

Seems like alot of you are confused about the fitment problem of Fluidyne VS Koyo, I will explain since I have the Koyo and my friend has the Fluidyne.

Fitment for Fluidyne:

Direct drop in, just minor trimming to stock fan bolt hole to match the Fluidyne. Yes, the fan bolt hole for the stock fan is off on the Fluidyne.

Fitment for Koyo:

Everything fits perfectly, except minor trimming to the passenger side inner bumper lining.

That's all!

Timmy

 

Thanks...........
So are they both equal thickness as well? Hold the same capacity? I guess you pay more for the Fluidine name then.....but if it's better, I'll pay for it.

 

Actually the Koyo is bigger. I dream of those temps. I must have a bad fan or something.

In my opinion the fitment issues with the Koyo are no BFD. Seems like much to do about nothing to me.

 

my koyo slid in perfectly other than the A/C condensor (smaller radiator looking think) mount on the passenger's side needed to be reversed (now it sits a little crooked) because it wouldn't clear the lip on the radiator.

 

That's weird, mine doesn't interfere with the passenger side a/c bracket at all. Mine condensor actually line up very close with the radiator like the stock look.

I have a 93 touring, I suppose you have a R1?

Timmy

 

yep. I do have an R1. different bracket/mounting location because of 2nd oil cooler? hmm.

 

I am beginning to theroize that the install difficulties will differ between R1 and Touring. R1 doesn't come equip with A/C in Japan, and has to be 'dealer added' in the states, which might result in differences in mounting brackets.

Timmy

 

I order the the PWR radiator from , comes nicely polished and is much bigger than the Mazdacomp radiator that I had

 

On the KOYO, I drilled in 2 new upper mounting holes about 1 inch higher so that it dropped in a little more and I didn't have to reverse the brackets. Also, I bent back the lower mounts a little so that it would slide back as well. The IC and everything else just popped right back on perfectly. Very happy with the results and temps.

 

You guys know if either the koyo or fluid fits fine with the rx7fashion i/c?

 

The radiator does help especially with a FMIC. I had the Koyo with a HKS TypeS.

I put a Koyo on my SR and my temps never move in regular traffic.

 

i would suggest making air ducts to get more air thru the radiator, it worked for me

 

Okay, so it sounds like I should get a Koyo soon. My Greddy FMIC has to come out I assume but since my A/C system is removed it shouldn't be a problem. Good thread. Thanks guys

 

Radiator upgrade shouldn't interfere at all with RX7fashion 'type' FMIC's.

My friend was going to get the Fluidyne and he was told they are currently relocating to some other states, so Fluidyne will not be available until September. That means Koyo'R US!



Timmy

 

I bought a fluidyne b/c I didn't care for the thicker core of the Koyo. The thicker core is great if you have sufficient air pressure from road racing the car. Otherwise, the excess heat can't be bled off. However, for street use, you need greater surface area relative to volume of the radiator.