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From where oh where to duct rear brakes??

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  • From where oh where to duct rear brakes??

    I just picked up a set of "nismo" replica side skirts. I really have no idea if they are or aren't buy they have a weinie little hole at the back, in front of the rear tire, presumably as a rear duct simulator.

    Before I install these I was thinking of cutting it open more and puttting a hose duct there that I can later attach a hose to to route to the rear brakes.

    Is this the best idea? Would it work well? Or is a little scoop under the car a better place?

    I couldn't find too much stuff online but I'm sure I'm just not looking in the right places.

  • #2
    I don't think the back of the side skirt would be the best place.

    I think a NACA duct in the rear quarter panel behind the door would be best, at least on an S14, drawing from the underside of the car might work on an S13 with the tank in a more out of the way spot, but you're talking about some potentially seriously hot 'cooling' airflow coming off the track surface if you pull your air from under the car.
    '95 240sx

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    • #3
      The F40 runs a NACA duct down low in the rear, I just can't find out if it leads to the engine bay or brakes...

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      • #4
        I believe the lower duct is for the brakes. They have those huge upper ducts for the engine.
        VVL S14 on KW's...

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        • #5
          I think the c5 vette vents at the back of the skirts are brake ducts too. Maybe it isn't a bad place to put them after all.

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          • #6
            Originally posted by jr_ss View Post
            I believe the lower duct is for the brakes. They have those huge upper ducts for the engine.
            Actually, take a look at the F40 LM; I think those ducts in the skirts are for the rear brakes...

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            • #7
              Drawing from the bottom on an FR car you also compound track temp with engine and exhaust temp. The F40 in the picture above doesn't have that problem being mid engined.

              As for cooling, check out Mike Pollard's S14 race car. His cooling ducts replace the rear corner window. This way you don't have to punch holes in your fenders to get the desired effect.

              Last edited by Lev; 08-07-2013, 07:32 AM.

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              • #8



                these are some of the picture i could find of the F40 rear... i don't really see where does skirt vents lead. These is nothing going to the brakes that i can see from these pictures, unless it just vent to the wheel well entirely. And as for the rear window vent, it would be nice if you knew the stream profile of that part of the car to locate the best position to insert the vent.
                Last edited by bejota180sx; 08-09-2013, 10:26 AM. Reason: fixed images and typos

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                • #9
                  Originally posted by Lev View Post
                  Drawing from the bottom on an FR car you also compound track temp with engine and exhaust temp. The F40 in the picture above doesn't have that problem being mid engined.

                  As for cooling, check out Mike Pollard's S14 race car. His cooling ducts replace the rear corner window. This way you don't have to punch holes in your fenders to get the desired effect.


                  Considering it's a drift car I doubt those are ducted to the rear brakes. That's also not necessarily an ideal spot for a track car to duct air since he gets airflow while sideways.

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                  • #10
                    Originally posted by bejota180sx View Post
                    these are some of the picture i could find of the F40 rear... i don't really see where does skirt vents lead. These is nothing going to the brakes that i can see from these pictures, unless it just vent to the wheel well entirely. And as for the rear window vent, it would be nice if you knew the stream profile of that part of the car to locate the best position to insert the vent.
                    That's not an LM, but it looks like it has LM side skirts, unless that's just a reflection.

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                    • #11
                      Using the side skirt opening as ducting for the rear brakes would be the logical idea for cooling. If you have the means to cut a duct into the quarter panel behind the door, then do that. you will provide more air flow to the rear calipers at a cooler temperature. If not, use the hole that is cut in the side skirt.

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                      • #12
                        the main concern here is, is there air actually running close enough to the surface so far back into the body or has it separated enough to not make a big difference in cooling or none at all. At least that would be the first thing i would check see what the air is doing at that part of the body.

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                        • #13
                          Why are you so concerned with cooling the rear brakes? From my experience they really don't need it. Maybe if you're building an endurance race car, but I doubt that's the case...
                          function > form
                          1990 240sx fastback: IN PROGRESS

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