Trunk Radiator Venting Question

[godzillarb]

For various reasons, I decided to setup my car with a rear / trunk mounted radiator (mostly to have room for super awesome intercooler ducting).

The car has two large vents right behind the door which will be ducted to the radiator. The vents stick out ~2" into the air stream.

http://i72.photobucket.com/albums/i170/tdi520/240sx/1200-1.jpg

Inside view with the radiator mocked up:

http://i72.photobucket.com/albums/i170/tdi520/240sx/IMAG0805.jpg

There is also a possibility of getting air from under the car with this setup as well.

Trunk view:

http://i72.photobucket.com/albums/i170/tdi520/240sx/IMAG0808.jpg

Now for the question, where would be the best place to vent the radiator heat? There is room to vent it on either side of the license plate or through the trunk lid. Ideally, the venting should be in a low pressure zone so that the heat is sucked through the radiator, as well as pushed, while driving. Any thoughts?

[rwtf]

have fun running them hoses. :P

[gtouch_nissan]

check out the WELD car that is for sale on here it has the same thing

[godzillarb]

Yep, I've seen that car... but I wonder if that's actually the best place for the vent.

[slider2828]

Look at DSR, Dentsport Racing 240, they have mounted it in the rear.... Only car I have seen.....

[rbs14kouki]

Just do traps in the rear quater glass or rear glass with fans ... Alot cleaner then What you have righ now

http://mustangsdaily.com/blog/wp-content/uploads/2010/11/03_vaughn-gittin-mustang-sema.jpg

My 2 cents .

[donandal]

I did a car recently with a rear mount radiator.
I used the factory water pump and it was powerful
enough to move the water to the rear. ( subaru 2.5L )

I also used 1 1/2" stainless tubing bent to shape to
run all of the way, except the rubber hoses at the engine.
I flattened the tubing to an oval shape except at the hoses.
The extra water in the tubes added a considerable amount
of cooling capacity. They were under the car so the heat stays
outside. The venting is probably not the best pressure area, but
it still vents well enough that the fans only run when stopped
with the air conditioning on.

My son has an S13. After comparing your setup, it looks like
you may have a good amount of heat trapped in the car
in that area just in front of the rear trunk lid. It may benefit
you to move the radiator back a little, and provide some ducting
that slopes upward to the trunk lid to vent that area when the
car gets shut down. It's amazing how much heat is still there.

I think the side intakes will be sweet, and obviously something
different.

Nice.

[godzillarb]

Just do traps in the rear quater glass or rear glass with fans ... Alot cleaner then What you have righ now

http://mustangsdaily.com/blog/wp-content/uploads/2010/11/03_vaughn-gittin-mustang-sema.jpg

My 2 cents .

That setup looks like it'd work as a track only, but this thing will be driven on the street from time to time and needs to move as much air as possible (FL summers are a bitch). Function > form.

I did a car recently with a rear mount radiator.
I used the factory water pump and it was powerful
enough to move the water to the rear. ( subaru 2.5L )

I also used 1 1/2" stainless tubing bent to shape to
run all of the way, except the rubber hoses at the engine.
I flattened the tubing to an oval shape except at the hoses.
The extra water in the tubes added a considerable amount
of cooling capacity. They were under the car so the heat stays
outside. The venting is probably not the best pressure area, but
it still vents well enough that the fans only run when stopped
with the air conditioning on.

My son has an S13. After comparing your setup, it looks like
you may have a good amount of heat trapped in the car
in that area just in front of the rear trunk lid. It may benefit
you to move the radiator back a little, and provide some ducting
that slopes upward to the trunk lid to vent that area when the
car gets shut down. It's amazing how much heat is still there.

I think the side intakes will be sweet, and obviously something
different.

Nice.

Interesting about the stock water pump working. I was planning on going to an electric just to be on the safe side.

As far as moving the radiator back, there starts to be serious issues with the fuel cell location if I do that. But yes, I agree that the radiator should be ducted to the exhaust vent to aid in cooling. Trying to fit a meth tank, battery, fuel cell, fuel pumps, plumbing, and radiator with ducting in the trunk is a lot. Good thing I'm putting the dry sump oil tank in the front! haha.

[karl wasabi]

Any progress on this build? I've always wanted to do a rear mounted radiator since I'm running an RB. These new pictures have given me more inspiration to do it:

http://sphotos-b.xx.fbcdn.net/hphotos-ash4/425483_10151139849210809_1104494080_n.jpg
http://a1.sphotos.ak.fbcdn.net/hphotos-ak-snc6/278046_259210360855471_454388412_o.jpg