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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 01-14-2022, 08:01 AM   #1
grumpysnapper
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Rear mounted water "helper" radiator

Belts and braces...
Basically, I never want to worry about cooling ever again...no matter what the situation, so I'm adding a small "helper" water radiator inside the rear bumper (in addition to a second oil cooler up front).
Its 280x189x37mm (21 Row) Plate and Fin with a 9" Spal puller fan.
An electric booster pump will feed it (which can run up to 27 litres per min), with both fan and pump triggered whenever the front radiator fans activate.
There is a heap of vacant space in the rear bumper shell, and with the reversing light unit removed, quite a decent sized vent directly into what I would assume is a low pressure zone. (A serious amount of flow exits when the fan is active)
I see it mainly as a helper with cooling down straight after a hard run.
The radiator is mounted and the pump is in place and the electrics are live, so now I'm in the process of running (5/8) hose from front to rear..and back.
There will be wire mesh protecting both sides, and even though it looks vulnerable to rocks etc from under the car, it is surprisingly well protected...sitting up fairly high, and with a large muffler in front (which I am going to wrap to all but stop any radiant heat).
I'm going to be fascinated to see if it works and how it goes (fingers crossed!).
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Old 01-14-2022, 08:04 AM   #2
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Where are you pulling oil from?

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Old 01-14-2022, 08:08 AM   #3
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Where are you pulling oil from?

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Coolant
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Old 01-14-2022, 08:11 AM   #4
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Coolant
Oh I saw you say oil cooler and assumed this was that. But I remember you from your other thread now. Why not just get a bigger radiator? That would offer much more cooling than this thing. Not that this won't work, cuz it will. I just don't believe it will work as well

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Old 01-14-2022, 08:20 AM   #5
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Oh I saw you say oil cooler and assumed this was that. But I remember you from your other thread now. Why not just get a bigger radiator? That would offer much more cooling than this thing. Not that this won't work, cuz it will. I just don't believe it will work as well

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Yeah, already have a bigger and more efficient front (PWR) radiator, and I quite like the idea of taking any heat I can away from the engine bay area.
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Old 01-14-2022, 08:58 PM   #6
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could also consider running an aluminum hard line for most of the length underneath the body. it's not going to add much cooling, but would add more cooling than a rubber line in the same scenario...
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Old 01-16-2022, 03:27 PM   #7
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I dig it, also reminds me of the diff cooler openings on the cup cars.

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Old 01-16-2022, 05:33 PM   #8
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Hmm .. how rad is protected from rocks flying in air intake path and puncturing it? how it's protected from dust or dirt getting by in air intake path and clodging rad up (probably even more of issue with rad fan sucking extra of that when it's operating)?
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Old 01-17-2022, 08:20 AM   #9
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Hmm .. how rad is protected from rocks flying in air intake path and puncturing it? how it's protected from dust or dirt getting by in air intake path and clodging rad up (probably even more of issue with rad fan sucking extra of that when it's operating)?
I dont think it will be too much of a worry, it sits up quite high, and is shielded by the muffler.
I'm also going to put some wire mesh in front of it, to make sure.
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Old 01-17-2022, 08:35 AM   #10
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Passed its first proof of concept test, with flying colours.
No leaks, electrics working properly and the pump is very effective.
Lots of heat!
The 9" fan overlaps the edge of the radiator so there are some heavy plastic shrouds top and bottom to stop the fan drawing air from around the edges.
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Old 01-17-2022, 04:04 PM   #11
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Do you run a rear diffuser?
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Old 01-17-2022, 07:22 PM   #12
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lol that reverse light is awesome.

Have you ducted your radiator? The front one I mean.
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Old 01-17-2022, 07:28 PM   #13
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Where in the cooling circuit are you pulling from and returning to?
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Old 01-18-2022, 01:06 AM   #14
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This is pretty sweet setup.

You could also replace sections of the lines to/from the rear rad with something like this
CK100-8 Single 16 Inch Pass Heat Sink Super Flow Fluid Cooler.

Also if you don’t have already a radiator mister helps a lot. A lot of rally guys use this.
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