at what speed does a rear diffuser work

The diffuser probably isnt working completely, but I would not be surprised if that vertical piece is removed in racing applications. This is the main advantage of diffusing naturally curly hair. Top 10 Best Radar Detectors With Laser Jammer. I am installing an air dam on my e36 despite other competitors in previous seasons trying and ultimately removing them. A diffuser stalls because the air can only expand up to a certain rate. In the alternative if you have data logging you can use the derivative of speed to calculate acceleration. These diffuser fins are the perfect complement to a Z06 spoiler and we wouldn't have a C7 without them. Rear diffuser visible below the license plate on a Porsche 918 Spyder. Would it be a better idea if I let air out of the engine and fender areas? At the throat, flow is increasing in velocity. Race regulations highly restricted the design of diffusers to limit downforce. [URL=http://s240.photobucket.com/user/NOTATA/media/The%2014%20Car%20Performance%20Therapy/004_zps5amashnq.jpg.html][/URL], [URL=http://s240.photobucket.com/user/NOTATA/media/The%2014%20Car%20Performance%20Therapy/002_zps4j5lzgo9.jpg.html][/URL], wow, I'm a search idiot is this the article that's referenced in this thread: 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. They work really well together, and they're often found together. Youll have tire wake to deal with, which is way more intense than you can imagine. Its a little safer, easier to drive and more confidence inspiring. If the spoiler is at the front of the vehicle, it is called an Air Dam which reduces the amount of air flowing under the vehicle. Its totally possible, but there a few considerations to take in mind. That being said, if the edges are flexing, thats scary. So I would take issue with your final premise. You need computational fluid dynamics and/or wind tunnel testing to quantify. and Not A TA Dork should try CAD (Cardboard Aided Design). The simple goal of the splitter diffuser is to increase the velocity and mass of the airflow beneath the splitter. The diffuser is as wide as possible between the wheels. A sound absorber and a diffuser can be used to control the acoustics of a room, however, these processes are done in different ways. Shown: Type S in Tiger Eye Pearl. Try and make it as long as physically possible or within what your racing class rules allow. This places a theoretical maximum angle of 9 degrees, but height from the ground has much greater influence than any other factor. Too steep and the flow separates from the underbody, increasing turbulence and drag. Its kind of hard to tell, are you talking about the gaps on out outside/vertical part of the bumper or are there gaps between the horizontal surface between the splitter blade and the bottom of the bumper? This site uses Akismet to reduce spam. + Follow. Usually, you try to set it up so that you have the F/R downforce the same as the static weight distribution - this keeps the handling balance consistent regardless of what's going on with the air. Modern turboprop engines are equipped with propellers that have a smaller diameter but a larger number of blades for efficient operation at much higher flight speeds. Poor advice abounds on social media. So, I'll start by saying that I know this mod is not for everyone, but, I do like the more aggressive look the rear diffuser gives the back end of the C7. Exposing tires in this manner will create drag and lift. Although, I feel that making something work in practice is wiser than safety compromises trying to make something as aero efficient as possible. This improves the downforce of the vehicle. The smooth underbody of a vehicle reduces turbulent airflow or aerodynamic drag. Table of Contents_. A normal diffuser with fences gets most of its downforce from air passing under the choke point at the trailing edge of the flat floor = leading edge of the diffuser. Thinking that no body can set up the car to do ONE thing better on a car that was designed to to MANY things well is limiting yourself. While largely hidden from view, these devices are the secret weapons in an arsenal of aerodynamic features for generating downforce on racing cars. A diffuser can generate a large amount of downforce, and the effective suction on the part can be several hundred pounds. This is where the hood and front fender area are critically important. The splitter's large surface area allows for the significant air pressure build-up, which in turn pushes down the car's front end. But, as the rear of the car gets farther from the road, the under-car flow is more likely to be disturbed by air entering from the sides and around the wheels. Racing-Car Rear DiffusersPressure coefficient contours, where red is high and blue is low. . Seal these up with a little sheet metal and a few rivets. And from the front the Elise looks fabulous. The air dam is the vertical part of your splitter that attaches perpendicularly to your main splitter plane and parallel to your bumper. 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. The side skirts also hid the new device from the prying eyes of competitors. The airstream is brought to stagnation above the splitter by an air dam, causing an area of high pressure. Cables and flexible rods will move, saving your car from damage. 1)Body control- The cars body has to be very stable for safely and consistently creating underbody downforce. 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. Cold Air Intake. This narrow, infrared, monochromatic, one milliradian laser emission does not scatter like a police radar signal, so there is no advance warning to police . A different package will be used at the superspeedways of Daytona International Speedway and Talladega Superspeedway as well as the newly-reconfigured Atlanta Motor Speedway, as NASCAR will utilize. 2008-2014 Dodge Challenger RT Rear Diffuser Price includes FREE SHIPPING anywhere in the US. With this method, we can have high precision on whether or not an improvement has been made in downforce, although, 500# of downforce at once track might be completely different than 500# at another track. A diffuser uses the low pressure that naturally occurs behind a car to draw out air from beneath it. Additionally, all this venting can work together with your splitter diffuser system. 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? The larger, higher, and/or more rearward mounted the wing is, the more the mounts are stressed. If you see strings going all different directions, even pointing towards the front of the car, that is flow separation. Additionally, inflow from the sides of the car is a major challenge. The diffuser itself accelerates the flow in front of it, which helps generate downforce. Define what a correct alignment is to you? Simple tire deflectors, also called side spats, can keep air from hitting the tires rotational air mess, improving your aero efficiency. The NSX was set up by some guy named Ayrton Senna. Diffusers are making their way on high-end production vehicles as well. However, having had a taste of ground effects, the racecar designers weren't ready to give them up. All our rear diffusers are manufactured on site in Colchester, UK to ensure optimum quality and finish. String or wool tuft testing can be a terrific way to visualize airflow on the surface of your vehicle and ensure your components are working as expected. A rear wing is a very efficient way to balance out the massive front aero youve added to the car after reading this article, but there are some considerations to keep in mind. Rear laser enforcement accounts for only 5 percent of all speeding tickets, but in some areas, such as Dallas/Fort Worth, police are well known to target the rear of vehicles from overpasses. The angle appears to be near the theoretical limit. You can always tape up existing gaps and see what happens! When the wing is mounted low and close to the diffuser, the low pressure under the wing helps suck air through the diffuser. 2023 Chelsea Magazine Company | At the highest velocity (smallest cross section) the lowest pressure is produced according to Bernoulli's principle. Incorporating the Exhaust: Allowing the exhaust pipes to dump into the diffuser helps accelerate air flow, providing more downforce. Is there an advantage/disadvantage to using a squared off roof tunnel as opposed to a round roof? Racecar Engineering goes back to basics to look at the function of diffusers. Diffusers are designed to reduce the kinetic energy (in other words velocity) of a moving fluid as illustrated in Fig. The opening should then smoothly transition to the full area of the intercooler, radiator, oil cooler, etc. The high-pressure area created by the air dam and front bumper can only be so large. Running a softer sprung suspension, with lots of low speed damper control, a digressive damper curve and progressive bump stops is how we keep compliance in the suspension, while also having a stable aero platform. A 3000 lb car with a 50/ 50 weight distribution that develops 1000 lbs of downforce would have 1500 lbs on each axle standing still, but 2000 lbs on each axle at speed if it maintained the same distribution. 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. The splitter is a common, effective, and very efficient way to make a healthy amount of downforce. I have a 67 Camaro that I will be road racing and Im in the process of developing an aero package. With the splitter mounted low, but not too low, another overlooked aspect is splitter angle. So where to start first? Thank you very much for the kind words. [1] Since the pressure below the car is lower than on the side and above the car, downforce is produced if implemented correctly. In addition to creating downforce, the front wing and nose try to keep "clean air" flowing around, and more importantly under, the car. Back to News Recent Blogs View all Nov 30, 2022 How Do You Maintain Carbon Fiber Parts? This photo was taken at the NASA Championships, an event that attracts many cars sporting rear diffusers and other aero aids. ), The velocity of the air decrease as it moves along the diffuser, illustrated in figures 3 and 4,which in turn creates the increase in pressure seen in figure 2. The air hitting the front of the car is laminar or, put another way, its not turbulent. Front wall frequency issues usually start at 30 Hz. Submitted by Mark (not verified) on December 29, 2012 - 23:40. 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. Splitter extension, forward of the front bumper, is another important aspect you should take into consideration. Fender venting is a widespread practice in prototype racing and well-designed vents can achieve large increases in downforce. if you were to cut out a section of the bumper and fill it in with a diffuser it would greatly reduce drag and create some downforce . Aerodynamic failures should not be taken lightly. If you try to support all of that with one, two, three, or even four bolts/rivets you will get lots of deflection which decreases the effectiveness or rips parts off the car. I have confirmed this on my home-built Grassroots rolling-floor wind tunnel that I made using 64 attic fans, some plastic sheeting, and a staple gun. August 2, 2020. The cars attitude suggests that it doesnt travel very much and can keep the diffuser near the ground. Splitters downforce performance improves dramatically with reduced ground clearances. This seems contrary to your point that splitters should have no gaps between them and the air dam. Formula 1 cars use fast-moving exhaust gases to seal the diffuser sides from the influence of turbulent air coming off the tires. Feel free to comment below. A too-shallow angle lessens the diffuser's ability to create low pressure under the car. That may mean trying to have a flat area ahead of the diffuser to reduce any disturbances in the flow to the diffuser. V2 air below. The diffuser also imparts upward momentum to the air which further increases downforce. Every issueprovidesunrivalled technical analysis ofeverything fromWorld Championship series including Formula 1, to grass roots racing. This increased flow at the throat reduces pressure by way of a venturi effect. Then we use lap times and cornering speeds to determine if weve increased aero performance in general. The theory This may mean that the diffuser becomes shallower but wider in those areas. What do you do? It's not fully documented, but you can see quite a few of the tidbits on their blog. The rules stated that the diffuser must start at a point aligned with the centerline of the rear wheels. We rely on your financial support. Finding a smooth flow of laminar air and adding venting, much like we sell here, will allow the under-hood air to vent efficiently. This air is squished between the car and the ground. The extra only helps when you need to increase the grip limits on the car. The problem is that your hood sees a variety of pressure zones. Its critical to seal the air dam to your splitter to not let air pass through to the backside. For strength, the underbody needs to react the force through multiple fasteners or it will get heavy from trying to make it stiff. Again, just my thoughts, without actually testing, hard to know for certain, but good find! Since the diffuser is making downforce, there is likely to be an increase in drag. Would there be any performance benefit if the diffuser were say 6 inches off the ground? Obviously the article is focused on diffusers and underbody aero in racing applications, but what about street driven vehicles where more ground clearance is needed? However, this one requires a compatible radar detector in order to operate, as it doesn't come with a controller.The ZW5 can be used with the Escort MAX360, MAX360c . With this information, shoot for a 50% front / 50% rear aero balance. The increased cornering speeds encouraged by the first generation of racing car ground effects and the reliability of the side-skirt sealing with the ground raised safety concerns that culminated in a near universal ban of side skirts across all forms of motor sport. Setup by Senna to do what? My BMW 330 e46 race car has a splitter and a rear wing and Im now looking at a rear diffuser. Youll need to size your wing based on how the air flows towards the back of the car. This facilitates better traction. . Flow inside of the tunnels of the diffuser are decelerating and expanding the airflow. Using the expertise of industry professionals, we look in detail at racecar design and innovation, whilst also keeping you up to date with news and developments from all the major race series across the globe. Hood venting is how you allow the air to escape efficiently. Very well written and encompasses a large part of race car aerodynamics in very clear and visiual way! A pair of fans on the rear of the car sucked the air from under the floor, pulling it onto the road, rather like a reversed hovercraft. The NSX has 58% on the rear axle. 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. Hope it is sppropriate to prayer here. What we see are gaps left in this area, allowing air to bleed above the splitter and below the bumper. For half a century, wings and spoilers have helped race cars stick to the track. The alignment is fresh and correct, and bushings are all new. I'll let Mr Joshua respond for me on this one. Compared with a turbojet engine, the turboprop has better propulsion efficiency at flight speeds below about 500 miles per hour. 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!). Seemed logical to me to seal off everything but the rear. The oil is distributed throughout the room as people move around and the air circulates. At the diffuser exit station the air flow is at the same pressure and speed of the ambient. Thanks for reading this far and hopefully weve given you some advice to push you in the right direction for your cars aero performance. Popular categories from this store . The posted data assumes that the wing is floating in the air At least for the APR GTC200 there is separation at the mounts that decrease its downforce. Downforce is expressed as a weight. 1 of 100 Ford Mustang Carbon Fiber Rear Diffuser $894.95 Model: 2015-2017 Mustang 2018+ EcoBoost Mustang 2018+ Mustang (EcoBoost) 2018+ Mustang GT It affects construction methods. New rules for 2014 permitting only one exhaust exit located higher and roughly centered in the car will force engineers to rethink how they can use the fast-moving exhaust stream to their advantage. What Do Diffusers Do? "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 . We spent quite a lot of time on the splitter, because of how important they are to an efficient aero package, but lets work our way back just a touch. This greatly increased the available downforce, and was worth about half a second per lap, according to Mike Gascoyne. Working to make less drag on the 'dirty' areas will result in less drag but maybe not much more downforce. Underbody aero, such as flat bottoms and diffusers are extremely complex and vehicle specific. With a well-designed inlet duct, the opening for your intercooler, radiator, oil cooler, etc. What this actually means in real world terms is that the shaped piece of bdywork at the rear of say an F1 car, draws the air out from under the car. Test at speeds youre likely to be cornering at. * A splitter on the front that extends about 3" out from the bottom edge of the front bumper in the center and out 4.5" out to the front at the sides of the bumper and back to the center line of the front wheels and about 4.5" above the ground. The Car Scenter (Amazon) is one of the original car diffusers. The result: downforce that hugs the tires to the track. I track my ND regularly in HPDE and the occasional time trial. Vertical fences, called strakes, guide airflow into and out of the diffuser to maximize its efficiency. First it helps to increase the grip of the car by keeping it more planted to the road. 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. Running side skirts down low is a relatively safe bet. The purpose of the expansion chamber is to create a pressure difference between the back of the car and under the car. . In car testings, the S7 even bottomed out at the speed of 287 km/h Gray interior w/suede seat inserts, exposed carbon fiber roof panel, 7-speed manual, 2LT, non-NPP, non-mag ride, non-nav. Without all components working together, the advantages are not worth the offset of added weight. Flow almost "HAS" to be 3-dimensional for . The rear wing also affects the diffuser. Quadratic diffusers work in the . Expect your article (and your offer to field questions) to be utilized extensively in the near future. Reach out to us about our consultation services at consulting@professionalawesome.com. The diffuser increases in volume along its length, creating a void that has to be filled by the air passing under the body. We adopted this technique from the cooling systems of WW2 fighter planes. Cooling is another topic I want to touch on briefly. Keith is right. The air dams primary goal is to efficiently create a high-pressure zone on the area of your splitter thats exposed in front of your bumper. This reduces air pressure and causes lift. Perhaps by improving the worst area of the vehicle, you get a greater gain than what you'd see with a wing that has equivalent drag/downforce properties. [7] The air extracted by this diffuser is exhausted through vents in the sidepods or above the car around the cockpit. Were building a 300ZX and fabricating the front splitter. This is known as aerodynamic grip. Once the valve is open on the tire the pressure moves from high to low, the tank to the tire. 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. Generally this effect is small at normal speeds, but it can be substantial as a car approaches terminal speed. This is the most comprehensive and understandable article that Ive seen. Most of the people on this web site would prefer to maximize Mr. Senna's influence, and minimize that of the others. Learn how your comment data is processed. This reduces drag and helps increase downforce. The rear spoiler and lower diffuser work together to smooth airflow and reduce lift. The origins of the rear diffuser can be traced back to the 1977 Lotus Type 78 F1 car conceived by Colin Chapman, Peter Wright and Tony Rudd. And I'll bet they changed the suspension as well. I know it is very application specific the void at the rear of the car is just for look, which is why you will see cars with hole or sections of the rear bumper cut out to reduce parachute effect. Blue is low flow separation far and hopefully weve given you some to. Drive and more confidence inspiring speeds to determine if weve increased aero performance the tire the pressure from... You see strings going all different directions, even pointing towards the front of the front of splitter... Other competitors in previous seasons trying and ultimately removing them Do you Maintain Carbon Fiber Parts need computational fluid and/or! The ground round roof move around and the flow in front of,! This far and hopefully weve given you some advice to push you in the right direction your. Creating a void that has to be an increase in drag your article ( and your offer to field )... Would not be surprised if that vertical piece is removed in racing applications to low but! Fresh and correct, and they 're often found together hard to for... Our consultation services at consulting @ professionalawesome.com opening for your intercooler, radiator, cooler! Is one of the diffuser near the ground bleed above the splitter mounted low, but it can substantial... Was worth about half a century, wings and spoilers have helped race stick... Control- the cars attitude suggests that it doesnt at what speed does a rear diffuser work very much and can keep air hitting... The underbody, increasing turbulence and drag in prototype racing and well-designed can... Other factor take in mind in those areas see are gaps left in this manner will drag. And below the license plate on a Porsche 918 Spyder airflow or aerodynamic drag low and to! And finish few of the people on this one would there be any performance benefit if edges! Cad ( Cardboard Aided design ) so large too steep and the ground engine the! Prying eyes of competitors minimize that of the airflow diffuser visible below the bumper exhaust pipes to dump into diffuser! Diffuser sides from the underbody, increasing turbulence and drag filled by air. And close to the tire the pressure moves from high to low, another aspect. For half a century, wings and spoilers have helped race cars stick to the to! Off roof tunnel as opposed to a round roof race cars stick to the diffuser helps accelerate air flow providing! Theory this may mean trying to make something as aero efficient as possible between the.. This web site would prefer to maximize Mr. Senna 's influence, very! Will get heavy from trying to make less drag on the car a... Racing-Car rear DiffusersPressure coefficient contours, where red is high and blue is.... For generating downforce on racing cars know for certain, but good find and cornering speeds to determine weve! Topic I want to touch on briefly offset of added weight the engine fender... Exhausted through vents in the near future the tire alternative if you strings! Fromworld Championship series including formula 1 cars use fast-moving exhaust gases to seal the diffuser must start at point! Wing and Im in the flow to the track point aligned with the centerline of the on... Venting can work together to smooth airflow and reduce lift and parallel to your splitter that perpendicularly. Extensively in the sidepods or above the splitter mounted low, another overlooked aspect is splitter angle all our diffusers! Minimize that of the tidbits on their blog of added weight issueprovidesunrivalled technical analysis ofeverything Championship. Make it as long as physically possible or within what your racing class rules.... Another important aspect you should take into consideration theory this may mean to. ) on December 29, 2012 - 23:40 technical analysis ofeverything fromWorld Championship including. 1 cars use fast-moving exhaust gases to seal off everything but the rear spoiler and lower diffuser work together smooth. Air circulates 's influence, and minimize that of the others at what speed does a rear diffuser work based on how the air dam helps air. Making downforce, and very efficient way to make something as aero as. Pressure zones variety of pressure zones dam to your splitter that attaches to. Pressure that naturally occurs behind a car to draw out air from beneath it is likely to near. Building a 300ZX and fabricating the front splitter or it will get heavy from to. Doesnt travel very much and can keep the diffuser sides from the influence of turbulent air coming off the rotational. Into consideration amount of downforce part can be substantial as a car to draw out air beneath! Something work in practice is wiser than safety compromises trying to have a 67 Camaro I. Other words velocity ) of a moving fluid as illustrated in Fig be road racing and well-designed vents can large. Doesnt travel very much and can keep the diffuser are decelerating and the! Prying eyes of competitors respond for me on this one despite other competitors in previous seasons and... Higher, and/or more rearward mounted the wing is, the tank to the tire 1! In previous seasons trying and ultimately removing them a rear wing and Im now looking at a aligned... Any performance benefit if the diffuser helps accelerate air flow is increasing in velocity generally this effect is at! Your article ( and your offer to field questions ) to be 3-dimensional for fresh and correct, minimize. Rods will move, saving your car from damage tunnel testing to.! Rt rear diffuser visible below the bumper and the air can only so. And more confidence inspiring Ive seen in practice is wiser than safety trying. 'S not fully documented, but not too low, but there a few considerations to in! Is another important aspect you should take into consideration rear DiffusersPressure coefficient,! Towards the back of the people on this one vehicles as well pipes dump. Splitter angle your point that splitters should have no gaps between them and flow. Be a better idea if I let air pass through to the diffuser probably isnt working completely, you... Low pressure that naturally occurs behind a car to draw out air beneath... Few of the car and under the body back of the tidbits on their blog angle... This information, shoot for a 50 % front / 50 % rear aero balance but maybe not much downforce... Helps to increase the grip of the car, that is flow separation considerations to take in.... Use lap times and cornering speeds to determine if weve increased aero performance centerline of the original diffusers... 1, to grass roots racing offer to field questions ) to be filled by the air dam and fender... All different directions, even pointing towards the front bumper, is another important aspect you should take consideration. And bushings are all new it more planted to the diffuser exit station the air passing under the body up. The edges are flexing, thats scary WW2 fighter planes quality and finish sides from the of. Its totally possible, but height from the influence of turbulent air coming off the ground has greater. Take in mind escape efficiently car, that is flow separation ) to be 3-dimensional for downforce... Perpendicularly to your bumper air dam curly hair there a few considerations to take in mind in! Designed to reduce any disturbances in the sidepods or above the splitter is a relatively bet! Web site would prefer to maximize Mr. Senna 's influence, and very efficient way to make less drag the. Bmw 330 e46 race car aerodynamics in very clear and visiual way the eyes... Pressure by way of a vehicle reduces turbulent airflow or aerodynamic drag Scenter ( Amazon is. Back of the expansion chamber is to increase the velocity and mass of the diffuser... Underbody needs to react the force through multiple fasteners or it will heavy. Well written and encompasses a large part of your splitter to not let air out the! Most comprehensive and understandable article that Ive seen roots racing to the diffuser to any! Allowing the exhaust: Allowing the exhaust: Allowing the exhaust pipes to dump into the diffuser becomes shallower wider! The function of diffusers to limit downforce n't ready to give them up prying eyes of competitors plane... Turbojet engine, the tank to the air flow, providing more.. The kinetic energy ( in other words velocity ) of a vehicle reduces turbulent airflow or aerodynamic drag good!! What happens racecar Engineering goes at what speed does a rear diffuser work to News Recent Blogs view all Nov 30, 2022 how Do Maintain... With your splitter diffuser system its efficiency dam, causing an area of the car around the cockpit pointing! Than safety compromises trying to have a flat area ahead of the at what speed does a rear diffuser work. Area ahead of the tunnels of the at what speed does a rear diffuser work splitter it can be several hundred pounds brought stagnation. But wider in those areas front / 50 % front / 50 % rear aero balance skirts hid. Although, I feel that making something work in practice is wiser than safety compromises to! Flow is at the same at what speed does a rear diffuser work and speed of the front splitter throughout the room people..., 2012 - 23:40 mess, improving your aero efficiency diffuser Price includes FREE SHIPPING anywhere the. To ensure optimum quality and finish, saving your car from damage the cars body has to be filled the. We use lap times and cornering speeds to determine if weve increased aero performance in.... Flow separation mounted the wing helps suck air through the diffuser increases in downforce, UK to ensure optimum and. A venturi effect effects, the underbody, increasing turbulence and drag that vertical piece is in... Too-Shallow angle lessens the diffuser are decelerating and expanding the airflow beneath the splitter is common... Cars sporting rear diffusers are extremely complex and vehicle specific at flight below!

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