speeddemon7

Ok so im debating on which radiator I want to purchase.
The koyo is cheaper,thicker at 53 mm and obviously holds much more coolant.
The fluydine is slightly more expensive and thinner at 38mm and holds less coolant.
Now my question is this.In theory the koyo should outperform the fluydine due to the extra holding capacity of coolant and also the larger surface area which can disipate heat better.If im wrong someone help me out.Im just puzzled at the fact that the fluydine is more expensive when its fairly clear that the koyo is much better.Once again if im wrong someone help me out.The only benefit is see over the koyo is that fluydine is not as thick which could possibly ease the instalation of a front mount intercooler.
The only other thing I can think of is that maybe the fluydine is made out of better materials than the koyo and therefore doesnt need to be as thick in order to do the same job.If anyone can shed some light on this id really appreciate it.Thanx.

SpeedKing

iTrader: (4)

https://www.rx7club.com/showthread.p...=koyo+fluidyne

clayne

No contest, Koyo wins.

We're concerned about cooling here, not minor fitment issues.

RxSeven1

iTrader: (2)

try searching, theres at least 20 threads on radiators...for example

https://www.rx7club.com/showthread.p...light=radiator

tbielobockie

or the bullshit. The only thing that matters with a radiator is size. And the Koyo is bigger for less money.

TwinTriangles

I love my Koyo, works great...

Zerocool

iTrader: (2)

Fluidyne is better. Better craftsmanship and ton better quality. Just because the Koyo has a larger capacity doesn't mean it's better. Do the research, I think if money wasn't an issue most people would get the Fluidyne.

cpa7man

iTrader: (2)

I know Steve & Rich at Gotham talked me out of the Koyo. They claim the Fluidyne is a better radiator. I trust them to know these things. The Koyo with the thick core and a thin price is very appealing.

hyper7

love my fluidyne. perfect fit and works great, not to mention how B-E-A-utiful it looks

i heard the koyo had fitment issues unlike the fluidyne. i think that everyone seems to think the BIGGER the better which is total BS because i think the more EFFICIENT the better IMHO

DCrosby

If both are made out of the same alloy (Aluminum) Bigger (More surface area is better)

Koyo is made in malasia or somewhere out west or far east depending on where you live, and labor is cheaper there.... And Fitment is an issue, but that's cause it's bigger, if it was smaller like fluidyne, it'd fit perfect as well...

I say go whitch what makes you happy, it's the same debate as AST Replacement / Removal BS... Nobody is going to be able to prove that his water seals went because he used one radiator over another... and anything that lowers your temp over stock sounds like a good way to go...

Scrapiron7

If you have a FMIC like myself, there is no fitment issue with the Koyo. Great quality and I have personally seen more people with the Koyo than any other.

hyper7

what im talking about when i say EFFICIENT is air flow through the rad. and the water flow within the rad. dont doubt that larger surface area is better just what cools and flows better which we dont know. i agree with DCrosby... go with what makes you happy afterall either one is better than stock

hyper7

bricke,
make the price the same as the fluidyne....and i wonder what rad. would be bought more!

Scrapiron7

Hard to say.. to myself price wasn't the issue, cooling capacity was. I certainly woulnd't cheap out on the cooling dept of our already fragile cars.

DCrosby

(SHHHHH) I'd pay more to go Koyo... (I didn't pay more but still went koyo)

V-Mount -> Check out the link in the sig

hyper7

bricke,
so you have your rad. sitting vertically with the FMIC. i agree that cheaping out on the cooling system is not an option. do you still us the stock fans?

hyper7

fluidyne is not only an aftermarket rad. company, they make a massive amount of stock rad. for hundreds of cars so thats why i decided to go with the fluidyne aside from the fitment

Scrapiron7

Yes and yes.

hyper7

bricke,
i was going to do a fmic but was apprehensive due to pressure drop. do you know what pressure drop you may have and what setup you are using?

kempo

iTrader: (2)

i had to replace my fluidyne with a koyo 53mm unit because after 4 laps at the track my temp. started to slowly go up. it went as high as 125 C on my PFC commander. after replacing it with the koyo rad. it has only gone as high as 96-98 C after 10 laps at 90-95F days.

wingsfan

Another vote for the Koyo here. Mine's good enough for my ls1, and it has 8 more cylinders.

TwinTriangles

Kempo said it best, But then again I only like the Koyo cuz I have it and it works good too

hyper7

kempo tells the story when on the track.

kempo,
are you running a fmic?

kempo

iTrader: (2)

hyper7, no i have a pettit cool charge III (same as m2 lage stock mount)

speeddemon7

hmm.very intersting indeed.I figured there was an ongoing debate.Well it seems to me like the koyo is a better radiator overall.And kempo has the numbers to prove which radiator is better for cooling.I think im going to go with a koyo.And when does anything ever line up perfectly.Id trade the small inconvenience of making it fit as long as it did a better job.Which it does according to kempo.