WHOOSH

I drive my car on the street, no racing no auto cross. I store it in the winter.
I would like to upgrade my radiator, because my AST is leaking,
so I figured I'd do both at the same time. I'm also going to do the radiator hoses
and the AST hoses. What is my better choice of radiators:
Economy Upgrade Radiator Price: $298.00 or Fluidyne Race Radiator Price: $499.00
from Rotary Performance?
Thanks Ted

insomniac

iTrader: (5)

you could try looking in the For Sale Section to find a decent price on a new/used radiator

Mahjik

iTrader: (1)

A standard OEM sized 'all metal' (whether copper or aluminum) radiator will be fine for your use.

TRISPEEDFD3S

iTrader: (26)

So, basically the economy radiator from RP would do fine.

FD3S2005

iTrader: (11)

iv got a fluidyne and it works great

pwwatkins

Get a koyo, performance similar to the fluidyne, can be had for around 300. I've never seen bad reviews of the koyo rad.

blackoutz

I have the full metal stock replacment and its working great. I costs about 180

ihavetwins

iTrader: (5)

i have a koyo works and fits into the stock location very well and its pretty big

alexdimen

iTrader: (13)

Some people have had cooling issues using the CSF copper replacement radiators. They have a lower fin count than stock and have flat, non-multi-louvered fins.

The CSF all aluminum street performance radiators are great, though. They have a high fin count and have multi-louvered fins. I'm using one and love it. Easy install and everything. The race radiator may have fitment issues due to it's size.

Here is a good thread about it: https://www.rx7club.com/showthread.p...opper+radiator

I would highly recommend radiatorworld.com for their price and service on the FD aluminum rad. My dad's even running one of their rad's on his '56 Ford Jubilee tractor ballin'...

alexdimen

iTrader: (13)

Get a real temperature gauge and check that assumption... read the thread I posted.

Str8Down

Do not get a Koyo. I have 1 and I think it is a good radiator, but fittment is a total bitch if you are stock. I was almost totaly stock when I bought it and it was a nightmare to install and get to fit with all the stock parts. Now if you plan on getting an intake, and an aftermarket intercooler, then I would say get a Koyo for sure, as it fits fine then.

Speed of light

iTrader: (8)

For your application, a stock sized radiator is fine. Some of the replacements are slightly larger than stock, around 32 to 36mm thick, which is ok. I do recommend an all aluminum unit.

The Koyo is big time overkill, and as was pointed out, can be a fitment headache. The Fluidyne is better for fitment, but still more radiator than you will ever need. (I have hands on experience with both of these.)

The main problem with FD cooling is getting adequate air over the radiator, not the radiator itself. One fairly easy mod that is very worthwhile is too relocate the battery out of the engine compartment. This is good for a number of reasons, but it really helps cooling (especially when relying on fans) by allowing substantially more area for the hot air to escape. Highly recommend. I would put this on your list of things to do while you have it apart.