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Open Track Racing
Aerodynamics for high speeds
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<blockquote data-quote="iismet" data-source="post: 15497059" data-attributes="member: 15250"><p>+1</p><p></p><p><img src="https://www.svtperformance.com/forums/attachments/diffusor2-jpg.79345/" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>You can just see the bottom of the exhaust - that is how low the floor is. I have checked mine several times with a level. We plan to build the ceiling @ 8 degrees. At 8 degrees from the floor there is a gap between the bottom of the bumper and the ceiling of the diffuser - that is how low the diffuser has to be. If he were to to sheet the bottom, lower the diffuser, correct the ceiling angle, he would want to push it back so it's trailing edge intersected the vertical plane established with the trailing edge of the spoiler. Also the outer strakes are too far inboard. Their job is to seal wheel well pressure out out of the diffuser. </p><p></p><p>The goal is to build a venturi with the area between the ground and bottom sheeting acting as the venturi throat. </p><p></p><p>With a dirty bottom he is dragging dirty air which creates lift.</p><p></p><p>Stolen for reference</p><p></p><p><img src="http://www.rapid-racer.com/resources/Rear%20Diffuser%20Aston.jpg?timestamp=1308760097364" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p><img src="http://www.racecar-engineering.com/wp-content/uploads/2009/04/Diffuser.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p><img src="http://www.supermotors.net/getfile/911459/fullsize/air-flow-under-car.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="iismet, post: 15497059, member: 15250"] +1 [IMG]https://www.svtperformance.com/forums/attachments/diffusor2-jpg.79345/[/IMG] You can just see the bottom of the exhaust - that is how low the floor is. I have checked mine several times with a level. We plan to build the ceiling @ 8 degrees. At 8 degrees from the floor there is a gap between the bottom of the bumper and the ceiling of the diffuser - that is how low the diffuser has to be. If he were to to sheet the bottom, lower the diffuser, correct the ceiling angle, he would want to push it back so it's trailing edge intersected the vertical plane established with the trailing edge of the spoiler. Also the outer strakes are too far inboard. Their job is to seal wheel well pressure out out of the diffuser. The goal is to build a venturi with the area between the ground and bottom sheeting acting as the venturi throat. With a dirty bottom he is dragging dirty air which creates lift. Stolen for reference [IMG]http://www.rapid-racer.com/resources/Rear%20Diffuser%20Aston.jpg?timestamp=1308760097364[/IMG] [IMG]http://www.racecar-engineering.com/wp-content/uploads/2009/04/Diffuser.jpg[/IMG] [IMG]http://www.supermotors.net/getfile/911459/fullsize/air-flow-under-car.jpg[/IMG] [/QUOTE]
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