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Aerodynamics for high speeds
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<blockquote data-quote="iismet" data-source="post: 15454364" data-attributes="member: 15250"><p>This one is from Maier Racing. </p><p></p><p><img src="https://imagizer.imageshack.us/v2/640x480q90/822/1brr.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://imagizer.imageshack.us/v2/640x480q90/921/gthTSv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>We had to build the dam and figure out how to attach it. We got down force as soon as we installed it. It is currently configured < 3" off the pavement. It is not a big shelf. I believe it works because we have accelerated the air under the car specifically at the axle line - we run a fully sheet-ed engine. The pressure is much lower there than stock. The rest of the air is directed above and around the front bumper cover. As you can see we have away to go on the sheeting - the work we have, made a significant difference in handling. Turn 9 at Portland is off camber and the car wanted to drive off (around 110). Our first shot with the splitter and we were driving it flat out which lead to MM3 components and bump steering the car. </p><p></p><p>Tuck exhaust up high</p><p></p><p><img src="https://imagizer.imageshack.us/v2/640x480q90/923/ksqeFB.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Splitters are not recognized as adding drag. The sill splitters extend into the sub-frame connectors. You do not want to drag air under the car. Rather force it thru a venturi with speed . You wish you could run the air faster under the bottom than over the top. </p><p></p><p>We run 1/8 inch of slope rear to front this gives us a venturi in side view (ours is weak without more sheeting). It is evolution for us. We modify it, run it, and check lap times and feel. The more you can sheet the better. We originally ran the Cobra hood with the vents punched out, but have since changed to a more free flowing hood and the cooling is boxed. This is another aspect of getting control of the air.</p><p></p><p><img src="https://imagizer.imageshack.us/v2/640x480q90/924/tgaA6g.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Meir has a shallow and a deeper one for flairs. Ours is shallow and we run trip fencing on the fenders because of the offset of the Enkeis. </p><p></p><p>At the rear the Terminator spoiler could be used as a baseline. As stated, I would try to get rid of it, but it may be that a Gurney attached to the spoiler could work well. Gurneys are not recognized for adding drag, but do help clean up the air - dirty air causes drag. Pretty sure Maiers spoiler is not what you want, but it all takes testing. A Maier spoiler could be purchased and cut down. </p><p></p><p>On a speed car I would lower the front splitter down to 2" off the ground. This will complicate your effort because you will need to remove it for transport. We are too lazy. I would space the bottom panels down. I would try to get slope with suspension setup, but would consider building additional slope into the floor if needed. I have seen studies where bottoms less than 2" lessened ground affect. You can really see the slope on current F1 cars. </p><p></p><p>I recently acquired this</p><p></p><p><img src="https://imagizer.imageshack.us/v2/640x480q90/924/ypN3sn.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>It comes from the factory with a sheet-ed bottom. It is sheet-ed from the front bumper to the back of the engine.</p><p></p><p><img src="http://cdn2.bigcommerce.com/server6100/fh9wsjv2/products/266/images/2516/Aston_Martin_V8_Vantage_Sport_Cat_X_Pipe_Install_1 __31456.1430934064.1280.1280.JPG?c=2" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Top speed claimed 175 - 3600 lb - 380 bhp. No splitter, no spoiler, no diffuser. Intake is boxed cold air, cooling is boxed, bottom is sheet-ed. I smiled when we put it on the rack because it increased my confidence we are headed in the right direction on the Cobra. It won't hang with a stock SVT on the street, but out of the box pretty sure it would get one on the track. (It will not hang with my Cobra on the track - it's not quick enough) The engineering, execution, and balance are beautiful and it is much easier to drive at the limit (49/51 with lower cg).</p><p></p><p>Our stuff is crude - it has been an experience in learning how to keep it attached. </p><p></p><p>If you have to turn at speed all bets are off :-D - I would think wing and enough HP to drag it. The air under this car is ripping - not fast enough <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /> Notice how close he is drafting. Is it possible he lost flow to the bottom?</p><p></p><p>[video=youtube;8snP33Ga3X4]https://www.youtube.com/watch?v=8snP33Ga3X4[/video]</p><p></p><p>chr</p></blockquote><p></p>
[QUOTE="iismet, post: 15454364, member: 15250"] This one is from Maier Racing. [IMG]https://imagizer.imageshack.us/v2/640x480q90/822/1brr.jpg[/IMG] [IMG]https://imagizer.imageshack.us/v2/640x480q90/921/gthTSv.jpg[/IMG] We had to build the dam and figure out how to attach it. We got down force as soon as we installed it. It is currently configured < 3" off the pavement. It is not a big shelf. I believe it works because we have accelerated the air under the car specifically at the axle line - we run a fully sheet-ed engine. The pressure is much lower there than stock. The rest of the air is directed above and around the front bumper cover. As you can see we have away to go on the sheeting - the work we have, made a significant difference in handling. Turn 9 at Portland is off camber and the car wanted to drive off (around 110). Our first shot with the splitter and we were driving it flat out which lead to MM3 components and bump steering the car. Tuck exhaust up high [IMG]https://imagizer.imageshack.us/v2/640x480q90/923/ksqeFB.jpg[/IMG] Splitters are not recognized as adding drag. The sill splitters extend into the sub-frame connectors. You do not want to drag air under the car. Rather force it thru a venturi with speed . You wish you could run the air faster under the bottom than over the top. We run 1/8 inch of slope rear to front this gives us a venturi in side view (ours is weak without more sheeting). It is evolution for us. We modify it, run it, and check lap times and feel. The more you can sheet the better. We originally ran the Cobra hood with the vents punched out, but have since changed to a more free flowing hood and the cooling is boxed. This is another aspect of getting control of the air. [IMG]https://imagizer.imageshack.us/v2/640x480q90/924/tgaA6g.jpg[/IMG] Meir has a shallow and a deeper one for flairs. Ours is shallow and we run trip fencing on the fenders because of the offset of the Enkeis. At the rear the Terminator spoiler could be used as a baseline. As stated, I would try to get rid of it, but it may be that a Gurney attached to the spoiler could work well. Gurneys are not recognized for adding drag, but do help clean up the air - dirty air causes drag. Pretty sure Maiers spoiler is not what you want, but it all takes testing. A Maier spoiler could be purchased and cut down. On a speed car I would lower the front splitter down to 2" off the ground. This will complicate your effort because you will need to remove it for transport. We are too lazy. I would space the bottom panels down. I would try to get slope with suspension setup, but would consider building additional slope into the floor if needed. I have seen studies where bottoms less than 2" lessened ground affect. You can really see the slope on current F1 cars. I recently acquired this [IMG]https://imagizer.imageshack.us/v2/640x480q90/924/ypN3sn.jpg[/IMG] It comes from the factory with a sheet-ed bottom. It is sheet-ed from the front bumper to the back of the engine. [IMG]http://cdn2.bigcommerce.com/server6100/fh9wsjv2/products/266/images/2516/Aston_Martin_V8_Vantage_Sport_Cat_X_Pipe_Install_1 __31456.1430934064.1280.1280.JPG?c=2[/IMG] Top speed claimed 175 - 3600 lb - 380 bhp. No splitter, no spoiler, no diffuser. Intake is boxed cold air, cooling is boxed, bottom is sheet-ed. I smiled when we put it on the rack because it increased my confidence we are headed in the right direction on the Cobra. It won't hang with a stock SVT on the street, but out of the box pretty sure it would get one on the track. (It will not hang with my Cobra on the track - it's not quick enough) The engineering, execution, and balance are beautiful and it is much easier to drive at the limit (49/51 with lower cg). Our stuff is crude - it has been an experience in learning how to keep it attached. If you have to turn at speed all bets are off :-D - I would think wing and enough HP to drag it. The air under this car is ripping - not fast enough :eek: Notice how close he is drafting. Is it possible he lost flow to the bottom? [video=youtube;8snP33Ga3X4]https://www.youtube.com/watch?v=8snP33Ga3X4[/video] chr [/QUOTE]
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