So I have come to the point where I need a new radiator. I have a 89 RX7 T2 with a Turbonetics 60-1 that is oil and watercooled. With this extra load the radiator has a hard time keeping the car cool after a few hwy pulls. Granted i only see 98 degree Celcius on the PFC but it stays there until I come to a stop or slow down below the speed limit.

Which rads are you guys running reccomend.

 

I have a Godspeed. Cools good. I have a n/a though but It should cool turbo good too. It's basically a Chinese knock-off of the Koyo N-flow.

 

https://www.rx7club.com/2nd-generati...iators-835115/ just the first thread that came to mind, been covered a ton. i have a corksport with taurus fan, and FMIC, no issues.

 

Thanks for th link. I think I read that one.

 

I've always used Koyo and there good.... stock vs Koyo below im sure it will get your temps down just run a good fan.

 

I have that same KOYO radiator, and I am NOT a fan of of its filler neck, nor its radiator cap mount Other than that, the radiator is solid, been using it for over 10 years

 

My problem is that while driving its fine. I hover between 89 and 91c in 100 degree weather. If any load is out on it I.e Full boost for a couple of gears it goes up to 95-98c. Never any higher. I think the bigger turbo is transferring more heat into the cooling system then the stock rad can handle. Yes, my turbo im using is water and oil cooled.

 

Are you efan or belt driven fan? Just curious.

Why are you worrying? In general, those temps are ok. The thermostat is barely open at the lower temps and is only *just* fully open at 95*C (203f). The OEM e-fan on the condenser also comes on at that temp, 97*c (207*f). If it continued to climb, I would worry.

Worry about something else.

 

Here is my writeup on the koyo n flow with stock shroud https://www.rx7club.com/2nd-generati...hroud-1063062/

With a little bit of fabrication, an aftermarket radiator would not be hard to modify and fabricate to fit the fc. Almost as easy as welding on an "L" bracket along both sides and drilling 4 holes. Electric fan of course. Running no heater would make things even easier for the radiator hoses

 

I like to keep them
As low as possible. Big cooling nut here lol. I'm on a E fan with cog drive system. The Efan is a fully shrouded unit from a mercury villager I believe. You are right about the temps. It has creeped to 98 once but never any higher. It falls as soon as I slow down or idle.

 

Efan. I spoke with Chris at rotary performance who is a gd friend and he suggested the koyo n flow as well but he said it was a bolt in for the s5?

http://koyoradracing.com/products/search.asp?frmMake=62&frmModel=719&action=Search+P roducts

 

You'll be fine putting it in an s4. Either acquire s5 radiator brackets or simply elongate/grind the mounting holes on s4 brackets to get it to fit.

 

It is, but you can get a nicer thicker radiator. Wish it never came with that extra filler neck

 

The N-flow does not come with that stupid filler neck.

 

I have played around with most of the popular efans. I was not that impressed with the Villager fan. Easy fit but not so much airflow on a thick radiator. The Taurus fan is far more capable. The best of them all is the 18" Lincoln Mark VIII. It will suck a golf ball through a soda straw. I am currently building a fiberglass shroud for a 2-speed Volvo fan on my TII. I have high expectations-Clokker thinks very highly of this fan.

Regarding radiators: I have a standard Koyo on my 90 very with a Lincoln Mark VIII fan set up for 2-speed. This is as good as it gets. 185* coolant on 100* days with full A/C running. On the TII I have a new CX Racing Dual pass rad. Very nice unit. This is the one I am building the shroud for. I cannot attest to the efficiency yet as I'm still in break in mode on a fresh rebuild. It comes with mounting brackets built in so you don't need those old radiator brackets.

 

I meant the filler top, sorry, not neck. All I needed was that bleeder on the upper hose. Now I have 2 radiator caps.