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Thread: Optimum exhaust placement to help aerodynamics?

  1. #1
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    Feb 2011
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    Optimum exhaust placement to help aerodynamics?

    I'm wondering if the exhaust stream can be used to help aerodynamics?
    For example to fill-out low pressure zones or to intentionally create vortices.

    Why McLaren places exhausts centered up?
    Are side exhausts pipes worse than rear exhausts?

  2. #2
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    the joss and that one off custom enzo had pipes out the top of the rear deck/lid which i assume was for aero..?
    Andreas Preuninger, Manager of Porsche High Performance Cars: "Grandmas can use paddles. They aren't challenging."

  3. #3
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    See also the blown diffusers from F1.
    Life's too short to drive bad cars.

  4. #4
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    Yes they can be used aerodynamically. The trouble is that depending on your engine style, you either want to keep them away from the aero or have them contribute.
    I am the Stig

  5. #5
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    Note also that depends on your implementation you may have issues with the aero being driven based on throttle input which was not desirable....

    In F1's Blown diffuser era(ie, as of end of 2011), in order to fully exploit the performance gain of exhaust flow, F1's engine mapping and "throttle" has been designed to maximize flow even on off throttle use. Since F1 cars have throttle by wire, the actual throttle opening is basically stuck at 100%, but based on the mapping, the timing are either done "properly" to produce power and torque to the wheel(when driver is on throttle) or retarded fully, all the while still dumping fuel and igniting it and just blow hot air out the exhaust("off throttle")....
    University of Toronto Formula SAE Alumni 2003-2007
    Formula Student Championship 2003, 2005, 2006
    www.fsae.utoronto.ca

  6. #6
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    Look at the tri-cluster on the back of the Lexus LF-A too

  7. #7
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    Jun 2010
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    See also this thread. Otherwise F1 is a pretty good guide to manipulation of air flow. That was where the top-exiting exhausts, blown diffusers and blown floors were pioneered. Recently, aerodynamics have been the only avenue still open for development in F1, so the designers have become quite good at gaining every possible advantage from the airflows around the car, including exhausts.

  8. #8
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    I'd say they didn't really "pioneered" them, but rather applied them to road vehicle....a lot of this are used on airplane....
    University of Toronto Formula SAE Alumni 2003-2007
    Formula Student Championship 2003, 2005, 2006
    www.fsae.utoronto.ca

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