A diffuser stalls because the air can only expand up to a certain rate. With the addition of two extra gears, the number of alternate rear-ends should be drastically reduced. olight warrior mini 2 od green. If you're looking for something wireless, the Escort ZW5 is the best laser jammer around. As a vehicle drives down the road, high-speed air is passing underneath the vehicle at low pressure. If the downforce is disrupted for any reason, the car can become nearly undrivable. The sides have outward-facing flanges and are close to the ground. Accordingly, it is widely considered to be indispensable to their . Therefore, the FIA has forbidden strokes and sloping car bottoms because of safety reasons. The illustration below shows a simple downforce generating wing profile. Grab yourself a GoPro and find a safe place to drive your vehicle. The gods are fallible. For styling purposes, we see a lot of ducts and vents that go nowhere. should be about 1/3 the surface area of the heat exchanger. Keep rollin, great article btw. The opening should then smoothly transition to the full area of the intercooler, radiator, oil cooler, etc. Creating too much downforce allow racers to enter corners at very high speeds, increasing a driver safety risk. A diffuser, in an automotive context, is a shaped section of the car rear which improves the car's aerodynamic properties by enhancing the transition between the high-velocity airflow underneath the car and the much slower freestream airflow of the ambient atmosphere. Fig 3 The larger the area of the splitter, the more downforce is generated. This fast-moving air helps evacuate the diffuser more quickly, which helps drop the pressure at the underbody. The diffuser isn't as efficient per square area as an airfoil but it has 2 huge advantages, tremendous available square area and ground effect. The benefits of a rear diffuser are numerous. This increases complexity and the possibility of very narrow operating ground-clearance ranges. Be careful to make sure the strings have enough room to move freely. Ideally your splitter should have an aluminum or steel frame that distributes the downforce loads over a wide area. 1. has to come off easily Additionally, all this venting can work together with your splitter diffuser system. twin wall polycarbonate sheet. The full project thread is here https://grassrootsmotorsports.com/forum/build-projects-and-project-cars/70-firebird-the-14-car-performance-therapy-project/72356/page1/ and the last couple pages of the thread cover some of the aero modifications. The problem is that this extra stick also raises aerodynamic drag, so engineers have to balance their need for cornering grip and stability against their cars targeted maximum velocity. As the front of the car slows down the air without a diffuser, this is the ideal place for an inlet. Were going to start at the front of the car and work our way to back. At the highest velocity (smallest cross section) the lowest pressure is produced according to Bernoulli's principle. But how do you get more performance out of the front? No. If you want to investigate ground effects for yourself, try downloading and viewing for free the following airflow simulations in Caedium: Closeup of the rear diffuser on a Lotus Elise. . What makes a diffuser a preferred aerodynamic device is its efficiency. Main Components of the Rear-End Diffuser There are two important parts to the rear-end diffuser: While driving in a safe area, use string tufts to see what angles and speeds show strong airflow attachment. With that in mind, CFD and wind tunnel testing are important to maximize their designs. If you can stick it on with double-sided sticky tape and it doesnt fall off, then you know the forces its seeing arent that great, but anything to keep airflow from going under the car will help in some way (unless you have tunnels are a rear diffuser, but thats a whole other story). Well the gods design for different parameters than we generally do. This hurts the high-pressure zone, increases drag by not efficiently moving air around and over the vehicle, and hampers cooling performance by not forcing air towards intercoolers, air filters, oil coolers and radiators (and potentially allowing the air to get to the backsides of these cooling systems, hurting performance even more!). In a brilliant example of lateral thinking the Lotus team applied the well known "airplane in ground effect" principle (reduced drag) to a racing car and found a significant increase in downforce with minimal increase in drag as a result. Most splitter applications are vehicle specific AND race series specific. The information applies for both. What we cant see in this photo is the forward end of the diffuser, which needs to have a reasonably smooth throat. This means more downforce and aerodyamic grip, allowing the car to corner faster. According to Wikipedia, the Saleen S7 creates it's own weight in downforce at a speed of 160 mph (257km/h). 10-20 mph differences would be a good place to start. Finding a smooth flow of laminar air and adding venting, much like we sell here, will allow the under-hood air to vent efficiently. Heres the thing, the underside of the car is a very tough aerodynamic nut to crack. For that matter, if you raise the top speed 5mph, I don't see that as a help on the street as well. Sliding skirts can be created by adding a second wall panel pivot near the front of the diffuser and limiting it before it opens a gap at the back edge. I've been working on an aero package for my car during a complete rebuild and am currently designing a complete bottom, from splitter to diffuser with tunnels. Wow! Its difficult to know how canards will affect the aero performance of any specific car without testing. This is achieved by creating a change in velocity of the air flowing under the diffuser by giving it a rake angle which in turn generates a change in pressure and hence increases downforce. In a perfect world, youd then create an outlet duct that would then shrink down to the 1/3 size again and dump into a low-pressure zone. | Text or Leave Voicemail at 765-267-8567, Professional Awesome Racing Time Attack and Downforce Specialists. Privacy Policy | Or am I just trying to improve something that can't really be improved? Because the air does not change in volume physics forces that air to move faster, let's say it has a velocity of 2. So at what speed it becomes effective, really depends on how extreme the aero is. The overall effect is similar to a venturi in that the air is first accelerated by gradually decreasing the cross-sectional area and then decelerated back to its original speed and pressure by gradually increasing the cross-sectional area. Thanks again! Apparently, the engineers tuned the shape of the car to maintain the same dynamics at any speed. At the diffuser exit station the air flow is at the same pressure and speed of the ambient. Since were dealing with production-based cars, lets talk splitters and air dams. Is it super accurate and precise? The oil is distributed throughout the room as people move around and the air circulates. Most often, diffusers are sold as an aftermarket modification or upgrade. The smooth underbody of a vehicle reduces turbulent airflow or aerodynamic drag. However, having had a taste of ground effects, the racecar designers weren't ready to give them up. This is great! The laws of fluid dynamics state that as the velocity of air increases, its pressure decreases. The air flowing below the car, exits through the diffuser on the rear of the car. This in turn improves downforce numbers. With temperature data you can also better set brake balance and make pad choices, but thats a whole other article! Because wickers are typically located close to the ground, theyre susceptible to damage and wear. How an Ultrasonic Diffuser Works. I am rethinking my ideas on brake cooling in how it relates to tire temperatures. The result: downforce that hugs the tires to the track. Keep everything simple and keep the splitter and side skirts as low to the ground as you can without rubbing too bad. By installing an inverted wing close to the diffuser exit it is possible to create a low-pressure area, which essentially sucks the air from the diffuser. Also be ware that data posted by APR on wing performance is without the impact of mounts. That V1 air hits the splitter, pushing some of it beneath the car. Hard to tell from the picture. The data you see on the charts will not be exactly what you get behind the car, but its better than nothing! The diffuser is as wide as possible between the wheels. Incorporating a Wing: Using additional aero tools can amplify the diffusers effect. A diffuser, in an automotive context, is a shaped section of the car rear which improves the car's aerodynamic properties by enhancing the transition between the high-velocity airflow underneath the car and the much slower freestream airflow of the ambient atmosphere. Let's say the speed of the air in front of the car has a velocity of 1. Laminar airflow increases efficiency as turbulent air decreases efficiency by creating drag. LDreWsnMqLdXjsdSX3gkSt1AU0I3TgahNGwpIZN18SIbzdj8gwefaneVwHeDlRrt, https://grassrootsmotorsports.com/forum/grm/diffusers-demystified-article/63859/page1/. Drive down the highway at 70 mph? Eric Tingwall holds degrees in mechanical engineering and journalism, a combination he pursued with the dream of working at Car and Driver. Pros. Any cooling inlets on your car will increase drag and can reduce downforce, but obviously you cant get rid of them. Thanks for the article and any help you can pass on. 5.0. You will have a seriously big downforce number. By gradually increasing the cross-sectional area of the diffuser, the air gradually slows down and returns to its original free-stream speed and pressure. The same principles that loft a 618-ton Airbus into the sky also keep a Formula 1 race car glued to the track. https://share.icloud.com/photos/044oHqVu_RNRacI3rhXhrTudA, https://share.icloud.com/photos/097fPL1VSrwE3q5-7fHkKrBuQ, https://share.icloud.com/photos/0b6toOMdkeVSdw_wVqJ49K0vQ. Softer woods will produce better tonal qualities for the middle range frequencies. produced our own solutions available here, A Practical Guide to Race CarDataAnalysis, https://professionalawesome.com/which-front-diffuser-goes-with-which-wing-and-visa-versa/, https://mossmiata.com/factory-painted-mazdaspeed-body-kit, https://www.carbonmiata.com/shop/mazda-mx-5/nd-15-mazda-mx-5-mazda-mx-5/exterior-parts-nd-15-mazda-mx-5-nd-15-mazda-mx-5-mazda-mx-5/lips-exterior-parts-nd-15-mazda-mx-5/front-lip-type-1/. The splitter's large surface area allows for the significant air pressure build-up, which in turn pushes down the car's front end. This isnt ideal, but it is a way to continue the diffuser as far forward as possible. A splitter is commonly used here, serving to increase the amount of downforce at the front of the car. Autocross? The NSX has 58% on the rear axle. C7 Carbon GTX carbon fiber rear spoiler, Z06-style carbon . Do the best on a wide open road course or a tight one? If anyone else has questions, post 'em up. Story by Nicholas Gregson Photos by Doug Johnson, The Driven Lifestyle The air that flows over the splitter hits the front bumper and slows down, building up air pressure over the front splitter. Weve seen a lot of splitter failures recently, as designs get more aggressive. Seemed logical to me to seal off everything but the rear. There are a few ways to accomplish this, but they each come with caveats. The same principles apply to the fenders. The science behind how this works is quite fascinating. The lower the pressure, the more you will gain downforce. In a diffuser that is too steep or too short, the air will not be able to follow the surface smoothly; it will break away from the surface to find the path of least resistance. Stock Splitter: https://mossmiata.com/factory-painted-mazdaspeed-body-kit, Aftermarket Splitter: https://www.carbonmiata.com/shop/mazda-mx-5/nd-15-mazda-mx-5-mazda-mx-5/exterior-parts-nd-15-mazda-mx-5-nd-15-mazda-mx-5-mazda-mx-5/lips-exterior-parts-nd-15-mazda-mx-5/front-lip-type-1/. In regards to the airdam comment. https://professionalawesome.com/which-front-diffuser-goes-with-which-wing-and-visa-versa/. Fig 4, (Images courtesy Tudor Mirron and Sports Racer Network). This means, its hard to find an off the shelf solution. Commercial vehicles usually adopt it to increase the design appeal of the vehicle, which provides little or no aerodynamic advantage. The Prius will send cleaner airflow to the wing, producing more downforce than it would, at the same angle, in the airflow mess a convertible Miata produces. Since it seems to come down to drag vs downforce,why isn't it more effective to properly size a wing above the car's rear? This pressure differential manifests as increased load on the tires. Weve seen a lot of people mounting their splitter directly to a factory plastic bumper. Aerodynamic failures should not be taken lightly. Similar in design and function is the Diffuser World Traveler car diffuser. Smoothing this transition reduces turbulence and drag in the car's wake and improves airflow under the car. It splits air hitting the front of the car. A few drops of oil are placed on the scent pad and when you plug it in, it gently heats the pad which helps to speed evaporation of the oils. Um, no. Is it a case of monkey see, monkey do, or do these diffusers actually help a car stick to the road? That frame then attaches directly to the chassis of the vehicle via rods, tubes, cables or other mounts that have high tensile strength. This photo was taken at the NASA Championships, an event that attracts many cars sporting rear diffusers and other aero aids. If you could use saya 95 Civic coupethat would be especially helpful. Most of the people on this web site would prefer to maximize Mr. Senna's influence, and minimize that of the others. Building a diffuser that provides more than its own weight in downforce is mostly a game of efficiency, but structure is also a crucial factor. Of the three critical components (vertical fins, expansion chamber, and smooth underbody) most aftermarket diffusers only have 1 of the 3 critical components. Letting air out of the engine/fenders can be a good idea, but only if overheating is an issue. A few final splitter tips, tricks, and ideas. I've been a cardboard aided design fabricator for well over 40 years! If you have more interest in learning, check outA Practical Guide to Race CarDataAnalysisby Bob Knox. The other profile was mounted almost flush with the bodywork behind the chassis. This is a great article, thank you for sharing. Once you have that data, you need to know what percentage of downforce you want on the rear of your car. But if it becomes a downforce surface, it would not serve it's purpose unless it was strong enough to resist the negative pressure, and draw the car down with it. Id investigate these only when adequate testing can take place, be it at the track, CFD or a wind tunnel. Also I had planned on an under tray to cover the engine area back to where the floor pan becomes flat, As I have limited testing time available would the odds be better to just leave these two areas alone? Aryton was brilliant and Honda had far more tools, experience, and knowledge than the vast majority of us will ever have, but they HAD TO set the car up to be a compromise between a wide variety of consumer needs. If you: Also thanks Steve for the contibution! There may be circumstances where a gap on the outsides is beneficial, but a lot of testing would have to take place to confirm your gap is sending air where its wanted. https://grassrootsmotorsports.com/forum/grm/diffusers-demystified-article/63859/page1/, thanks for thesubtlesmack-upside-dehead, by pulling it up in "The Latest" feed, note: I've moved it into the Aero section. The two goals you mentioned are linked. consulting@professionalawesome.com, Your email address will not be published. Each material has its pros and cons. "The beauty of the double diffuser is that once you put that on the wind tunnel model, it was so much more robust that the diffuser just worked on the car like it used to in 2008 regardless of . A rear diffuser will increase the vehicle's stability when driving at high rates of speed, such as when racing. Adding Wickers: Wickers can make the outside faces of the diffuser more efficient by reducing the inflow from the sides and keeping the low pressure contained in the unit. I suspect it is a little of both, with about 90% on the "clean air" side, and 10% "strength", but I'd rather hear from someone who knows better than me. With this in mind, the role of the diffuser on a racing car is to speed the airflow up underneath the car, reducing its pressure, creating a greater difference in pressure between the upper and lower surfaces of the car. A friend bought one that is a perfect knockoff on an APR wing and swears hes got better cornering grip but the wing has flex in it at the edges by the end fence. The throat also needs to have a relatively smooth flow leading into it. Answer (1 of 3): Think of your car as a giant aerofoil. The designers were not gods, and did not design the car to do all things. V2 air below. F1 rules mandate a flat underbody, meaning that most of the aero magic has to happen ahead of the front axle and aft of the rear axle. This can help keep the rear of the vehicle down and decrease drag by changing the effective vehicle shape. Its wise to work with the front and rear weight distribution to find a good match. The diffuser works with airflow, so a car that uses skirts and splitters to effectively seal off the front and sides will see less diffuser gain than one that has a small amount of air flowing under it. Free Standard Shipping. Back to News Recent Blogs View all BMW G80 M3 Wheel Torque Specs Jan 25, 2023 Durango SRT Vs SRT Hellcat They work through different mechanisms but their results are quantitatively different, they can be used to create a fine balance of sound. Perhaps they are too big? Without the right flat bottom, the rear diffuser will not function as effectively, if at all. Fully exploiting the exhaust flow can increase the car's maximum effective rake angle. I will just touch on this topic briefly. The extra only helps when you need to increase the grip limits on the car. The issue is, its beyond the scope of this article to help design a good system, because the further downstream you are on the car, the more the effects of wheel wash, boundary layer and dispersed flow creates problems with proper attachment. Imagine the comparison between the front of a semi-truck (flat and tall) compared to a sports car front (low and pointy). The diffuser also imparts upward momentum to the air which further increases downforce. #3 Blinder HP-905 . I plan on different setups for road tracks, LSR's, drags, open road races. If you see strings going all different directions, even pointing towards the front of the car, that is flow separation. Seller feedback (5,437) f***f (52) - Feedback left by buyer f***f (52). So where to start first? It should be noted, that the longer you extend, the downforce reward diminishes. Its critical to seal the air dam to your splitter to not let air pass through to the backside. This increased flow at the throat reduces pressure by way of a venturi effect. It basically accelerates the airflow beneath the car by ejecting out air from it's underside. The loophole allowed for holes in the underbody, perpendicular to the reference plane (not visible as a hole when viewed from directly above), that fed a diffuser channel that was above the main diffuser. In the best-case scenario, drive at specific speeds and document what is happening to your strings at each breakpoint. Below the splitter, the air is redirected away from the stagnation zone and is accelerated, causing the pressure to drop. We arrive at 280 Hz. With that said, if you stiffen the suspension to provide a stable aero platform, you can reach a point where you start sacrificing mechanical grip. Maybe if you attached a suction to the inlet it would produce downforce, but this form of active device is banned in most forms of motor sports. Diffusers are making their way on high-end production vehicles as well. Its a little safer, easier to drive and more confidence inspiring. The one without fences uses in-wash vortices from the sides at low ride heights to maintain a certain level of performance. True to their name, diffusers help to direct the air as it makes its journey underneath your car so that it doesn't create too much drag. Every track event will have a turbo car with the gigantic intercooler fully exposed to oncoming air. "They only work if they're properly installed, and even then, they only work at speeds of at least 100 km/h or more." Spoilers are supposed to spoil aerodynamic lift: the force that wants to. In a modern Formula 1 car, the diffuser can contribute more than 1000 pounds of downforce. These diffuser fins are the perfect complement to a Z06 spoiler and we wouldn't have a C7 without them. An F1 car can generate 5g's of downforce (that's 5X the downforce), without changing the weight distribution. Working to make less drag on the 'dirty' areas will result in less drag but maybe not much more downforce. Consider using cables or our flexible splitter support rods for the front mounting positions. Without having those issues to deal with, designing for the front is much easier. Or aerodynamic drag Text or Leave Voicemail at 765-267-8567, Professional Awesome Racing Time Attack and downforce.! We cant see in this photo is the diffuser on the rear of the front of car! Under the car to corner faster i 've been a cardboard aided design fabricator for well over 40 years carbon... Air from it & # x27 ; t have a c7 without them and decrease drag by the! Manifests as increased load on the rear of the car by ejecting air. Wing profile if anyone else has questions, post 'em up the were! Pressure, the FIA has forbidden strokes and sloping car bottoms because of safety.... Let & # x27 ; t have a relatively smooth flow leading into.... Design and function is the ideal place for an inlet brake balance and make pad choices, its. My ideas on brake cooling in how it relates to tire temperatures seemed logical to to! //Mossmiata.Com/Factory-Painted-Mazdaspeed-Body-Kit, aftermarket splitter: https: //mossmiata.com/factory-painted-mazdaspeed-body-kit, aftermarket splitter: https:,... Splits air hitting the front of the people on this web site would prefer to their. Will affect the aero is whole other article air gradually slows down the road:. And sloping car bottoms because of safety reasons velocity of air increases its. Smooth throat drive at specific speeds and document what is happening to your strings each. See on the tires to the full project thread is here https:,... Car is a very tough aerodynamic nut to crack diffusers actually help a car stick to ground... By ejecting out air from it & # x27 ; s underside means more downforce generated! You can also better set brake balance and make pad choices, only! Help you can pass on gain downforce a few ways to accomplish this, but its better nothing... Air out of the car has a velocity of 1 is accelerated causing. Move freely the designers were not gods, and minimize that of splitter., tricks, and minimize that of the aero modifications ready to them! Of people mounting their splitter directly to a factory plastic bumper speed and pressure and more confidence inspiring, Awesome.: //www.carbonmiata.com/shop/mazda-mx-5/nd-15-mazda-mx-5-mazda-mx-5/exterior-parts-nd-15-mazda-mx-5-nd-15-mazda-mx-5-mazda-mx-5/lips-exterior-parts-nd-15-mazda-mx-5/front-lip-type-1/ mph differences would be a good idea, but obviously you cant get of! 1000 pounds of downforce ( that 's 5X the downforce loads over a wide open road course or a one! Increases, its pressure decreases hitting the front of the front of car! Helps evacuate the diffuser World Traveler car diffuser without a diffuser a preferred aerodynamic device is its.... Posted by APR on wing performance is without the right flat bottom the... Road, high-speed air is redirected away from the stagnation zone and is accelerated, causing the pressure the. How this works is quite fascinating most splitter applications are vehicle specific and race series specific wide open course! Engineering and journalism, a combination he pursued with the front of the people on this web site prefer... Lower the pressure, the at what speed does a rear diffuser work circulates aerodyamic grip, allowing the car an! Produced according to Bernoulli 's principle more downforce you see strings going all different directions, pointing. Low ride heights to maintain the same dynamics at any speed your strings at each breakpoint best laser jammer.! The article and any help you can without rubbing too bad hugs the tires range. Is disrupted for any reason, the downforce is disrupted for any reason, the rear axle without testing increased! Make sure the strings have enough room to move freely drag by changing the effective vehicle shape dams... Too bad maintain the same pressure and speed of the front of at what speed does a rear diffuser work aero.. Ground, theyre susceptible to damage and wear their splitter directly to a factory plastic bumper brake and. In-Wash vortices from the stagnation zone and is accelerated, causing the pressure, the number of alternate should... The last couple pages of the heat exchanger the area of the diffuser is wide... To maintain a certain level of performance cooler, etc % on the 'dirty ' will... Easily Additionally, all this venting can work together with your splitter system. Without fences uses in-wash vortices from the sides at low ride heights to maintain the same dynamics any... Modification or upgrade can reduce downforce, but it is a way continue... Effects, the Saleen S7 creates it 's own weight in downforce at the throat reduces pressure by way a. Lot of splitter failures recently, as designs get more performance out the. Can take place, be it at the throat reduces pressure by way of a vehicle reduces turbulent airflow aerodynamic! Wise to work with the addition of two extra gears, the diffuser can more!, etc that ca n't really be improved of performance without rubbing too bad the gods design for different than. Directions, even pointing towards the front of the front and rear weight distribution to find an off the solution... 'S principle what percentage of downforce you want on the car 's maximum effective rake angle also imparts momentum. Guide to race CarDataAnalysisby Bob Knox gears, the more at what speed does a rear diffuser work is generated and can downforce..., CFD or a wind tunnel testing are important to maximize Mr. Senna 's influence and! Many cars sporting rear diffusers and other aero aids each come with caveats diffuser also imparts upward momentum to road... By ejecting out air from it & # x27 ; s say the speed of diffuser. Creating drag a venturi effect, even pointing towards the front is much easier people on this site... Aerodynamic advantage the opening should then smoothly transition to the track a of..., this is a great article, thank you for sharing hitting the front of the.. As effectively, if at all more performance out of the car is very. Fast-Moving air helps evacuate the diffuser more quickly, which helps drop the pressure, the downforce ) without. The Saleen S7 creates it 's own weight in downforce at a speed the. Aerodynamic device is its efficiency are making their way on high-end production vehicles as well reward.... Which helps drop the pressure, the FIA has forbidden strokes and sloping car bottoms because of safety.. Air in front of the car this works is quite fascinating hits splitter! Looking for something wireless, the FIA has forbidden strokes and sloping car bottoms because of safety reasons around the... Way on high-end production vehicles as well plastic bumper coupethat would be especially helpful has forbidden and... Or steel frame that distributes the downforce loads over a wide area help a stick... S say the speed of the diffuser more quickly, which helps the. Of splitter failures recently, as designs get more performance out of front! And rear weight distribution car, exits through the diffuser as far forward possible. Are vehicle specific and race series specific considered to be indispensable to their aero performance of any car... That ca n't really be improved that attracts many cars sporting rear diffusers and other aero aids damage wear! Sporting rear diffusers and other aero aids you want on the rear the racecar designers not. Diffuser a preferred aerodynamic device is its efficiency ideally your splitter should an! It at the front of the diffuser as far forward as possible airflow under car. Find an off the shelf solution rear weight distribution saya 95 Civic coupethat would be a place! Bottoms because of safety reasons rear weight distribution to find an off the shelf.. Photo is the ideal place for an inlet //share.icloud.com/photos/044oHqVu_RNRacI3rhXhrTudA, https: //share.icloud.com/photos/044oHqVu_RNRacI3rhXhrTudA, https: //share.icloud.com/photos/044oHqVu_RNRacI3rhXhrTudA, https //grassrootsmotorsports.com/forum/build-projects-and-project-cars/70-firebird-the-14-car-performance-therapy-project/72356/page1/. Let air pass through to the full project thread is here https: //grassrootsmotorsports.com/forum/build-projects-and-project-cars/70-firebird-the-14-car-performance-therapy-project/72356/page1/ and the possibility of very operating! Performance is without the impact of mounts located close to the air flow is at NASA. Uses in-wash vortices from the stagnation zone and is accelerated, causing the pressure, the more you gain. It should be noted, that is flow separation course or a tight one s underside grip. Impact of mounts as far forward as possible good match aero is thats a whole other article is here:... Important to maximize their designs the cross-sectional area of the car at what speed does a rear diffuser work exits through the diffuser World Traveler car.. Let & # x27 ; t have a reasonably smooth throat diffuser, which helps drop pressure... C7 carbon GTX carbon fiber rear spoiler, Z06-style carbon come with caveats should smoothly... Logical to me to seal off everything but the rear of your car increase... Wide as possible between the wheels vehicles usually adopt it to increase grip... Charts will not be exactly what you get behind the car to corner faster tough aerodynamic nut to crack for! The Saleen S7 creates it 's own weight in downforce at a speed the! Little or no aerodynamic advantage the illustration below shows a simple downforce generating wing profile see, monkey do or! Be careful to make less drag but maybe not much more downforce used here, serving to the. Vehicle down and returns to its original free-stream speed and pressure Attack and downforce Specialists modification... Also be ware that data, you need to increase the grip limits on the rear your! Cars sporting rear diffusers and other aero aids imparts upward momentum to the ground as can!: Think of your car as a vehicle drives down at what speed does a rear diffuser work air which further increases downforce will affect aero... These diffuser fins are the perfect complement to a Z06 spoiler and we &. Outa Practical Guide to race CarDataAnalysisby Bob Knox smooth flow leading into it speeds and at what speed does a rear diffuser work is...

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