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Old 03-31-2010, 09:08 PM   #1
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Default Rear mount radiator

Rear Mounted Radiator | The Real JDM - Interactive

has anyone done anything like this?

I think it would be track car material only because its basicly trashing all truck space we already lack, but where would you source fresh air from?

Add a duct just aft the doors on each side to funnel air back there?

The supra seems to replaced the rear quater windows with ducts (seems kinda small to me, maybe high speed air coming in, will slow down as area becomes bigger to allow it to trasfer heat more efficently?)
Maybe even have flat bottom till that point where it acts like defuser to funnel air from under car into the radiator? (need some mesh to protect from road debris)

Could probobly have quite a bit of air exit if you punch holes in the area between the tail lights (that panel will most likely break anyway)

Could this allow you to seal off the front more, or redo the route for an intercooler too

Not sure how much air flow the engine bay itself needs?

Our frame rails i think would allow us to route the tubes for this beside them i think somewhat easy, maybe even an electric water pump, mounted in the back, easy access and cooler so less wear and tear on it?

Any other thoughts?
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Old 03-31-2010, 09:09 PM   #2
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I'm trying to figure out why/how this makes any sense...
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Old 03-31-2010, 09:25 PM   #3
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That **** and the car are mad dumb, son.
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Old 03-31-2010, 09:47 PM   #4
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Seems kind of odd, why not have the rad tilted forward with undercar ducting feeding it (maybe the mini window ducts as well if necessary).

I suppose they must be shedding tons of heat off their intercooler(s) thus no front mount rad can cool the engine?

I've only seen rear mount rads on rear engine vehicles, mostly race cars / FSAE. I imagine they need a replacement electric water pump to handle the long journey the coolant goes on.
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Old 03-31-2010, 10:44 PM   #5
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i thought the ALMS corvettes this year were running rear mounted radiators as well?

Could have sworn that the fan for it is mounted in plain sight in the rear, looked wierd to see it spinning on videos, does that strobe light thing like wheels do where they appear to spin backwards or really slowly
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Old 03-31-2010, 10:52 PM   #6
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The only reason it would make any sense would be to reeeally optimize intercooling
and to move weight to the rear (but also adds more weight due to plumbing)

so like, drag car. only.
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Old 03-31-2010, 10:53 PM   #7
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Quote:
Originally Posted by hustler View Post
That **** and the car are mad dumb, son.
^this.

the fact that it has a window tells you a lot obout the car.
All show, no go. Wasteful existence.
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Old 03-31-2010, 11:54 PM   #8
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and also seems to be popular for rallycross cars, but its more for duribility with how they get all banged up too

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Old 04-01-2010, 12:31 AM   #9
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
The only reason it would make any sense would be to reeeally optimize intercooling
and to move weight to the rear (but also adds more weight due to plumbing)

so like, drag car. only.

Also good in racing where you might bump people a bit. Its easier to protect a radiator at the rear than at the front in the evnt of a minor crash *usually*.

Getting airflow would not be too hard. You could run it from under the car, though what you are doing might then create a situation where you have air rushing to fill the low pressure area right under your doors. Might create a ton of drag as a result. Running it off the area just in front of the wheels might work I guess. I think that tends to have a lot of pressure buildup and drag already. This might relieve it and help to fill void space out back for reduced drag?

Lots of work, not much benefit. If you want to do something weird and cool, do an inverted shock setup or a VVT controller.
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Old 04-01-2010, 01:29 AM   #10
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Where do we have room to mount a radiator in the rear unless you cut a hole in the trunk floor and duct it.
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Old 04-01-2010, 10:24 AM   #11
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That could work. I was thinking about where a good diffuser would go. You would have to do a different muffler and all.
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Old 04-01-2010, 10:34 AM   #12
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But.... Where do you put the fuel cell then? I'm with hustler, mad dumb yo.
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Old 04-01-2010, 10:37 AM   #13
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It's a good thing Hyper isn't here...
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Old 04-01-2010, 10:43 AM   #14
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Shut it *******, his re-route has provisions for this already taken care of. If he were there would be no question how to go about this!
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Old 04-01-2010, 10:49 AM   #15
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hai guyths I want to mount a radiator up my ***. do you guys think its a good idea?
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Old 04-01-2010, 11:03 AM   #16
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Quote:
Originally Posted by 18psi View Post
hai guyths I want to mount a radiator up my ***. do you guys think its a good idea?
How is airflow in that region?
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Old 04-01-2010, 11:13 AM   #17
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Quote:
Originally Posted by Dlaitini View Post
i thought the ALMS corvettes this year were running rear mounted radiators as well?
Thats a rear-end gear oil cooler.
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Old 04-01-2010, 11:21 AM   #18
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Top Secret will challenge to the World


Quote:
Originally Posted by jdmsploogerag
Above you can see just how they finished it off from the trunk view. Notice the carbon panel and the glass window. Just classy.

Quote:
Originally Posted by horriblejdmwannabeblogger
So first things first. I am many things, but an engineer I am not. I simply do not have the training or experience to be one. I’ll explain in some moderate depth why this modification exists, but I without a doubt wont be able to explain it as well as a proper engineer would. There was a suggestion in the comments earlier that I interview a great engineer and get their involvement in the blog. That did give me an idea. One of the top engineers I know is Eric Hsu. Eric started XS Engineering and then went on to be one of the top dogs at Cosworth USA. Eric’s blog is linked to mine in the blogroll (http://jdm-insider.com/Blogs/Eric/), and its my idea that we do a joint blog post on this topic…me from the design and overview perspective, and he from what he’s great at, explaining the engineering and details that go way over my head. The only problem is, I haven’t asked Eric if he’d be willing to do this…and since I’m short on time, I’m just going to make my post and then humbly ask him if he’s interested in doing a post on his blog about this topic as well, from his perspective.

OMG I want these 5min of my life back.
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Old 04-01-2010, 12:18 PM   #19
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Quote:
Originally Posted by hustler View Post
Thats a rear-end gear oil cooler.
That is a scheme I have been considering if it turns out I need diff cooling and/or trans cooling. To me it makes sense for either. The proximity is much more favorable, and the lines can be much smaller diameter and thus easier to route.

I am not sure about the benefit of the rear mount location for a radiator. Sure there are some potential pros here but do they outweigh the cons as described above? Routing large piping and hoses? Plus I think it would be relatively difficult, and potentially a big source of drag, to get a Miata chassis to flow enough air through the trunk to cool a radiator properly:
- If you blow down, then you are forcing air under the chassis. Bad.
- If you are pulling air out from under the car, that is good, as long as there is enough flow potential there, and the differential pressure is helping. But if you have good aero, there should be LOW pressure under the car, and HIGH pressure above it, which is not favorable for that airflow scheme. Bad. It's been done on other cars of course but you need a LOT of fan power. Sucker cars anyone?
- You could perhaps pull air out from above the trunk (or the cab) and force it into the trunk, and blow out of the back of the car, with the radiator parallel to the trunk (needs bracketing and ducting to work properly) or parallel to the back panel (radiator has to be very wide and short and/or tilted with bracketing and ducting).

As far as the protection from impact, as I understand it, for a HPDE/TT car there should not be much need for radiator protection if any.
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Old 04-01-2010, 12:19 PM   #20
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Quote:
Originally Posted by fmowry View Post
How is airflow in that region?
Depends on what you ate for lunch
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