Rad and intercooler set-up for 20B FD3

[leeroy_25]

So I am getting to the stage where I need to get a rad and intercooler set-up sorted for my 20B FD. What I want to know is what do I need in the way of the two cooling systems? It will be a road car and not going too crazy on the mods but still.
Will a good thick core 13B FD rad be sufficient for the water system or do I need to get something larger like out of a skyline or supra or something with that sort of CC engine?
same when it comes to the intercooler. How do I find out what sort of capacity I need? I am actually thinking of running two smallish sidemounts either side of car space permitting. Unless anyone sees a downside? But need to know what sort of overall size I should be looking at and if the size on the inlet and outlet pipes is important? i.e the turbo outlet is 2" so does the intercooler pipe need to be at least this or 1.5 times the size etc?
Any thoughts/pointers gratefully received!

Thank you
Lee

[Grizzly]

TBH i dont know much about 20B\'s but i\'d be looking more at the Rad/Coolant side of things than the IC, you can just fit WI to drop air temps but water temps are a little more aquard to drop.

That said i know of 1 20b and that uses a PWR fd rad (whicg is about as big as you can go) don\'t bother with GTR or Supra rads as the rotary after market rad is that same if not bigger in size and some fit very snuggly between the chassis legs so not much room to go bigger. You can of course go more efficant such as a tripple pass rad (N-Flo) or some thing like that to help.

My advice would be look into getting a decent oil cooler set up, people often overlook this and it just adds strain to the coolant system.

[leeroy_25]

Thanks for the reply.. I have the oil cooler sorted and plans where it\'s all going to go to get it\'s own cool air flow as much as possible. Just need to decide best options to go for! I don\'t really want to fit water injection so want to have a decent IC set-up as well.

Cheers
Lee

[Grant Monkhouse]

Are you using standard ports? I think any fd aftermarket radiator will be good for you as I don\'t think you will be pushing too much extra power, more power more heat etc, as for an intercooler and pipe sizing, a decent front mount IC will do but a good vmount setup would be good and better for airflow through the coolers. Keep the piping the same size as the turbo outlet, makes it much easier for fitment as if you go bigger you will be tight on space with the 20B. The core should be 3-4" thick

[leeroy_25]

Thanks or the good advice Grant.. I am on stock ports at the mo.. When it get\'s a rebuild after it\'s all set-up and running I may do a very mild port on it. I am hoping to run around the 600bhp flywheel power which I think is pretty reasonable. You see lots making big numbers with boost but I don\'t want to boost it too much and keep it driveable for street use too!
For air flow I am thinking a sidemount either side of the car if I can fit them will be ideal and mean the water rad has nice clean cool airflow. other than maybe the oil cooler in front of it? Unless I can get that into a slight V configuration and have that below.
Is there anything other than piping size on an IC that limit\'s the flow capabilities? or is a core a core within reason? i.e as long as it has the depth it should be good to go?

[Grant Monkhouse]

Apparently the difference between a generic IC off eBay and an eBay IC is 10-15% cooling.

What do you mean by side mounted? You need good air flow to your IC as much as you do to your rad and oil coolers. I will try post a picture of a slightly different cooler setup that may work better for your as your space limited, although it will require good ducting to work to its potential.

600hp should be easy onthe standard ports, a friend of mine Kev who is on here has had a couple of 20B setups and one was standard ports with a gt4088 turbo, iirc he made 450-500whp on low boost

[leeroy_25]

Hi Grant. I was thinking 600bhp shouldn\'t be a strain.
I mean sidemount type interlcoolers like you normally have in the FD. But my plan is to put them where the Stock Oil coolers are and then run one single long thin oil cooler in front of or under the water rad. That way hopefully getting the best airflow to each thing I can. This is only an idea at present as I am not 100% space will permit this? I really need to have a mock up with the bumper on sometime soon!

Cheers
Lee

[Grant Monkhouse]

This might work


If you mounted the IC where the oil coolers are you wouldn\'t get enough cooling as they wouldn\'t be big enough even with 2 coolers one either side, plus it makes the piping more complex.

[leeroy_25]

Yes, that\'s a nice set-up. Pretty whooping intercooler. The SMIC FD ones are not that big though. So I think I could get two intercoolers to equate to 1.5 times the size of an FD one? Maybe? Just a thought. Not sure what size guide you would go by on the overall core .. ie. what core volume am I trying to achieve other than as big as possible!? Of course two cores means more piping. nothing particularly tricky.. Just more piping.
Are the cooling fans on the back of the rad in this set-up you show?

Thanks
Lee

[marky]

Hi Lee are you after a brand new rad and intercooler or second hand and proven?

Cheers

Mark

[Grant Monkhouse]

Yes the fans are in the back, basically the same as a standard FD but I think he\'s using aftermarket newer fans. He has actually cut front cross piece out to allow him to get his ducting in there. I wouldn\'t use 2 standard fd ICs on a 20B, I ran the standard one with a major extend port 13B and 1 bar, and my air temps were up to 50C!! They\'re just not big enough

[Grant Monkhouse]

You don\'t need to go as big as possible, you need to make the cooler work as good as possible. There aren\'t many people running 20B in this country so you have to try and see what works best.

[leeroy_25]

No I didn\'t mean standard FD IC\'s! Blimey! I meant like the after market trust type SMIC\'s you get for the FD.

Mark I am not too fussed either way at the moment. Looking at options and costing it up.

Will go from there.

Have you got something then? Always interested to know.

Thanks
Lee

[marky]

What\'s your e-mail address and I\'ll send some pics over

[Grant Monkhouse]

Here that setup with ducting and cross piece removed