Well i'm finishing up things on my end, but now i'm torn between radiator choices. I'm not sure what would be adequate for cooling. I've found a few different choices out there that would be nice. I test fitted the stock cosmo radiator in the car just to get an idea of what fitment would be like but it looks like 19" is just going to be too tall (the bottom sticks down too far). I've run across these two radiators, which are virtually one in the same, both are dual pass. but i'd like to go a bit taller. The price is very easy on these units, i've heard people praising these afco units in previous threads but i just want to be sure i get my choice right the first time around.

http://www.secureperformanceorder.co...ProductID=2500

http://store.summitracing.com/defaul...0&autoview=sku

 

AWR competition radiator is very good, alittle pricey, but worth it

 

FC?
Get the AFCO 80125N (I think or 80205).
Requires relocation of the battery tray, but for 20B projects it should not be a problem.

With IC's and rad's fighting for airflow up front, you need to stuff the biggest thing you can afford.

That AFCO link you put up is way too small.
20B's run HOT!

You really need a double-pass.
I have never found a single-pass that could cool the 20B adequately.


-Ted

 

FC?
Get the AFCO 80125N (I think or 80205).
Requires relocation of the battery tray, but for 20B projects it should not be a problem.

With IC's and rad's fighting for airflow up front, you need to stuff the biggest thing you can afford.

That AFCO link you put up is way too small.
20B's run HOT!

You really need a double-pass.
I have never found a single-pass that could cool the 20B adequately.


-Ted

 

If you go with that smaller radiator, you better find a decent size oil cooler to take up the cooling slack.

 

I was going to run a dual oil cooler setup anyways, but if you look closely that radiator is a dual pass. This motor is going to be run n/a for now, but will be fitted with a turbo maybe a year down the road. And yes, this motor is going into an FC. I really want to be able to make a final decision by sunday so i can get a unit on its way soon. Also, upon second glance 19" may not be too bad but still hangs a little low for my taste.

 

If you take a look in both pictures, you can see where a plate has been welded into the end tank to make it a dual pass unit. I dont know if it would be a solution but it looks like it carries a good bang for its size, but as stated before i may have to look into something a bit bigger:

 

They are too small.
Look at the 80205N.
You can go 26" wide - why you messing with such small rads?

Oh, and if you're going to track that thing, you almost required to go dual oil coolers.


-Ted

 

if you're gonna track that thing, you need as much radiator properly ducted even for the na. i used the stock turbos + teds afco on my fc and it acted like a stock radiator fd, fine around town but it got hot QUICK in the hills.

 

ted & j9fd3s, what oil coolers are yall running with your 20b's?

 

We're currently running two stock FC oil coolers up front.
Remember, our 20B FC is NA at the moment, so cooling requirements are not too bad.
We track this bitch, and coolant and oil temps are very normal.
When we tried with just one stock FC oil cooler, oil temps shot through the roof in a very short time on the track.

The car just got converted to dual Earls oil coolers in the corners.
We wanted to move the oil coolers out from away the front center grill area, cause the IC just for installed - all those heat exchangers are going to be fighting for airflow!
The Earls oil coolers have dedicated fans on them, so that helps with the cooling efficiency - we're using the stock FC bumper on them.
We're trying to develop a custom front with bigger openings to make airflow a bit better than what we got now.
We haven't tracked them car since the Earls units went in.
On the street, we've got no problems with cooling.


-Ted

 

you dont have a good link showing these coolers with the fans? also price
are they big $
thanks
matt

 

Ted/j9FD3S:

Is that a two row core or a single 1.5" row core? I am planning on using a radiator that is the same size and width as what you are recommending, but am still up in the air on depth. If I can keep it at <=2" it will be much easier to mount. My 2 rotor PWR core is 1.5" thick. A bunch of companies, such as Ron Davis make 3" thick cores. I'm curious about how much of a difference the extra depth makes. Has anybody had any experience using a core that thick?

 

Thx for the reply. I myself had plans of using just one of the larger capacity FB or FC long oil coolers(since they are more than double the size of both Fd oil coolers in the R1 & R2) but your reply makes me think that even they aren't large enough. Given their capacity, I'm really shocked that you had to use two of them stacked in a NA 20b. Is the track car also running a vented hood?

 

Yeah Ted, I think i'm gonna order this guy:

http://www.secureperformanceorder.co...roductID=2515\

I think i was just scared of running into fitment problems with these bigger units, but it now it will fit just pefect at second measurements on the car. Ted do you have any shots of your Oil cooler setup on your car? I've found a way i was thinking about mounting them but i am not sure yet.

 

Yeah, I've been meaning to get pics of the car, but either I or the owner were busy with one thing or another.
It didn't help that the owner flew up to Seattle over the holidays, so I didn't have access to the car for about 3 weeks.
I need to get batteries for my dig cam so I can get some serious pics of the car, since the turbos are almost ready to go in soon.

I gotta warn you though - we had to do a lot of fabricating to get those oil coolers to fit in the corners!

As for the question of how thick to go with the rad...we kinda stumbled onto that AFCO 80205N rad, and I believe it's slightly under 3" thick on the core.
It's not like we had any choice.
Rule of thumb is that the front half of the core does 75% of the cooling, and the back half does only 25%.
I have a friend who likes really thick stuff (he insists we need to run a 4" thick IC core!), since all the Supra guys do it. :P
I don't totally believe that myself - I think 3" thick (IC or rad) is just about right.
Going thicker just impedes the airflow too much - something we need to watch out for cause we're trying to street the car.

But to key is ducting, ducting, ducting!
I can't emphasize that enough, especially we're on a budget or size limitations.
I think a single FC stock oil cooler might be able to keep everything cool, but it has to be ducted properly - we never bothered ducting it.
We just had the two stock oil coolers stack running in front of the rad up front - nothing fancy.


-Ted

 

Good link on the pros and cons of a double pass radiator: http://www.stewartcomponents.com/tec...ech_Tips_5.htm

 

Interesting read...
Maybe one day I'll get around to plumbing a bunch of pressure gauges on the coolant fittings.
Right now, I know that the drop-in Koyo and Fluidyne rads for the FC do not cool the 20B versus our AFCO...


-Ted

 

yeah the afco works well.

also its worth looking at the rx8 coolers, they are bigger than the fd coolers, use the same fittings as the fc and are less money.

 

um in a turbo 20b application you need all the heat rejection you can get, especially if you're tracking the car. thats gonna be the most important thing. we talked about making a SU 20b car but we really dont think you can get enough cooling into an fc chassis to make it work on the race track with a turbo.

 

Alright, it was shipped as of yesterday, this will give me a bit of time to finish up things on the car like the dual oil cooler mounting and "creating" a vaccume source for my brake booster. Anyways, thanks for your help guys.

 

I just wanted to add, I spoke to Jim at Ron Davis about the merits of single v double pass. I told him I read that the benefits of a double pass core are largely lost because of the added restrictoin (basically parroting the info in the link above). To my surprise he asked me if I read that link. It turns out they had a long discussion about this with the author on a chevy forum (he said chevychat but I couldn't find the thread) and the author ultimately recanted his statement -but didn't remove the link . . .