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Radiator......how big does it really need to be?
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Author:  Insanity-74 [ Sat Jan 31, 2015 7:50 pm ]
Post subject:  Radiator......how big does it really need to be?
I am looking at designing a radiator for the ST205, I am struggling to combine this with a FMIC and keep the pipework short. I was making the radiator cross flow more of less the same size as the standard radiator.....but does it need to be that big? I looked at old ford escort radiators and Audi Quattro radiators and they seem to be half the size.....do faffs run hotter? Is it better keeping a large main radiator? Could it be shorter.....ie make room for FMIC pipes to pass over or under it? Is there a way to calculate optimum radiator size...or did toyota get it right first time?
Author:  cms-gt4 [ Sat Jan 31, 2015 9:39 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
I think you might want to get some data and then call some performance radiator shops. I do not know how they calculate an engines cooling needs but I bet the temp of water going in and coming out of the engine on track days would be a good piece of info to start.
I know pat C's 800+whp 185 uses a tiny radiator but he does drag racing and standing miles. I have heard some drag cars don't use cooling systems at all, so that may not factor into your cars use.
I too had considered a smaller radiator so that I can run my intercooler pipes beside it directly from the turbo and with a shorter path to the throttle body when I go fmic.
Author:  Insanity-74 [ Sun Feb 01, 2015 5:48 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
Would an AN16 fitment be big enough for a water return pipe on a sealed system header tank?
Author:  mixer72 [ Tue Feb 03, 2015 10:50 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
I found the stock rad to be plenty upto the job, id did a bit of back to back to back testing on a 56mm triple core ally rad and a new oem rad from TCB and found over all the oem rad cooled better than the 56mm ally rad, Edd has had fitted a rs500 intercooler and rad to get the shorted lay out he can and it seems to be working ok so far, so that's something you could look at doing
Author:  Treacle [ Mon Mar 16, 2015 10:03 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
As Lou says, my RS500 rad is much less tall than stock, but with a large header tank and swirl pot there is actually a substantial increase in coolant volume in the system to about 11 litres (stock is about 7.5 litres I'm told). Even though the rad is smaller cooling is noticeably better than before when I had a large ST205 specific alloy rad.

Image
Author:  Treacle [ Mon Mar 16, 2015 10:25 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
Couple more install pics:

Image
Image
Author:  TrackToyFour [ Tue Mar 17, 2015 12:05 am ]
Post subject:  Re: Radiator......how big does it really need to be?
Edd, are you using an OEM RS500 rad or an aftermarket version? The effectiveness of the rad is really more to do with the core design and effectiveness of the turbulators than the physical size of the rad. A point which is often overlooked by most people. Present company excluded of course! :lol:
Author:  ali86 [ Tue Mar 24, 2015 7:13 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
Tracktoyfour. What do you mean by turbulators
Author:  Treacle [ Tue Mar 24, 2015 7:33 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
It is an aftermarket alloy radiator Don, thicker than original RS500 one but don't know much else about it. It's certainly proved effective though and I have zero cooling problems with the smaller rad
Author:  TrackToyFour [ Tue Mar 24, 2015 9:59 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
ali86 wrote:
Tracktoyfour. What do you mean by turbulators
To ensure that coolant flow through the rad is non-laminar the rad elements are designed with crenulations or similar to ensure the coolant moves through the rad slowly enough to exchange heat with the air passing over it. This is what defines the heat rejection characteristics of the rad core much more that the absolute physical size of the rad or the associated tanks. The guy that built the rads for my track toy designed them around my projected power outputs and the type of racing I'd be doing.
Author:  cms-gt4 [ Wed Mar 25, 2015 3:35 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
What does a setup like that RS500 rad you have usually cost? I am leaning towards something like that when I go FMIC to reduce the amount of piping needed.
Author:  ali86 [ Wed Mar 25, 2015 3:40 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
Tracktoyfour thank you for that piece of knowledge:)

Cmsgt4. EBay you can buy cheaper ones but I think the like of forge or pace products or even pro-alloy will do the better ones.
Author:  Treacle [ Wed Mar 25, 2015 4:34 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
Anywhere from £200 to £600 approx for the rad, depending on the supplier and quality of the item.
Author:  cms-gt4 [ Wed Mar 25, 2015 5:35 pm ]
Post subject:  Re: Radiator......how big does it really need to be?
Thanks for the info. I was going to get a swirl pot for my current system but I had not found a solution yet.
I need to research turbulence as well. I am thinking about ducting the bumper intake to seal against the radiator so all air is forced into it. I considered using the RC side ducts to vent air behind the intercooler as well as the brakes but I am unsure if the turbulence created as it passes to the main duct could impede the airflow.
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