what radiator is good to use,i still have the factory one in the veh.anyone using the koyo they seem fairly inexpensive are they any good?

 

either fluidyne or koyo will work just fine.



i have a fluidyne, and it is a direct replacement. i've heard the koyo requires some slight modification, but can't say for sure.

 

I'm using the Srmotorsports.com "ultimate radiator"



According to my ex boss (has owned a radiator shop for 33 years) its "the finest craftmanship" hes ever seen on a radiator.

 

I have a koyo. Its much larger than stock but does require some modification to the brackets to get it to fit properly. Good quality also.

 

it takes "minor" mods.... hell, my underaged internet girlfriend was able to install one. The Koyo is a good unit.

 

Fluidyne is 1.5 times larger than stock and MAY required some minor modifications. ~$425 new

Koyo is 2.0 times larger than stock, WILL definitely require modification. ~$350 new.



There was some talk, unsubstantiated, that the Fluidyne flowed better or was a bit more efficient, but IMO, any small advantage there would be balanced with the extra coolant capacity of the Koyo.



I can't find the link now, but I thought I saw where someone just started producing an all aluminum OEM SIZE replacement radiator. IIRC, about $200.

 

i had a fluidyne and no complaints

 

Does it lower coolant temps when you upgrade? Or basically just the efficiency OF the radiator...



What are really the advantages to upgrading, besides the obvious weaknesses to the stock unit?

 

For a relatively stock car, the stock radiator, IMHO, was pretty good. The biggest problem with them now is that they're all 12 years old or more and the plastic end-tanks get weak with age.

I'm really happy with my Fluidyne, which I put on as a precaution. It was a bit pricey, but very good quality and fitment was pretty easy, though not "drop-in" like some have experienced. And my car does run cooler. I've got a Miata thermoswitch but it still takes alot longer for the fans to come on than it did with the stock rad. And recovery after getting into boost is also much quicker.

 

Ah, "recovery after boost".



That seems like one of the biggest factors.



Slow traffic, and hard runs, it takes a solid 5 minutes of constant 55MPH in 5th gear cruisin' just to bring the temps back down to 180F or so. And you gotta love heatsoak.



What about having, like, two 10" electric fans on the Fluidyne.



My bro had some kind of "aftermarket" switch on his old SR'd 240, that would kick on the fans at a certain temp, and then turn them back off at a certain temp.



Is that the idea by putting in either the FC or Miata thermoswitch?