Rear Diffuser
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enzo has it, slr has it, carrera gt has it. so do the evo9 and the upcoming wrx. if i'm not wrong, rear diffuser is to enhance air flow of the car hence improve aerodynamics right? when did it originate and how effective is it?
do drivers who have driven both evo8 and evo9 feel any difference with the addition of the rear diffuser?
personally i think it makes the car look very state-of-the-art and is a must-have for modern sports cars... -
i think it's a lotsa hoo-ha and a load parasite.
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Two words: COSTUME JEWELERY
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oh look, the next modding trend, rear defusers. let's begin to wander which family sedan will start sporting such a cool and yet effective aero mod.
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The rear diffuser is designed to reduce the air pressure under the carthrough the way it directs air flow and increases air speed. The air pressure above the car becomes relatively greater, and pushes the car downwards. The downforce increases the friction, and hence the available grip, of your tyres.
It won't improve your aerodynamic efficiency because it generates a big wash behind the car...nothing lots of power can't sort out.
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concept seems 2 make sense, but i remain skeptical on really how much useful downforce is produced as a result.
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A tailwind will screw things up.Originally posted by tailslide:concept seems 2 make sense, but i remain skeptical on really how much useful downforce is produced as a result.
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Originally posted by tailslide:
it works ba.. if it didnt... dun think F1 cars would be using it..
concept seems 2 make sense, but i remain skeptical on really how much [b]useful downforce is produced as a result.[/b]
question is however... how much is too much for a road car? -
no pun intended i hope? this tail's wind will seriously screw up some appetiteOriginally posted by Kuali Baba:A tailwind will screw things up. -
yah, but everything in an F1 car is honed to such perfection, any slight increase in downforce is significant on the car. i mean, a 0.001g downforce might be worth a few seconds off the track time on a sub 1000 kg car as compared to a 1.5 ton behemoth like the rex or the evo.Originally posted by nOrmalbOi:it works ba.. if it didnt... dun think F1 cars would be using it..
question is however... how much is too much for a road car?
dats y it begs the question, how useful izit in road going terms? -
different strokes for different folks i guess.. but to me.. it is pretty much useless..Originally posted by tailslide:yah, but everything in an F1 car is honed to such perfection, any slight increase in downforce is significant on the car. i mean, a 0.001g downforce might be worth a few seconds off the track time on a sub 1000 kg car as compared to a 1.5 ton behemoth like the rex or the evo.
dats y it begs the question, how useful izit in road going terms? -
in an F1 car, it works. In road cars, it depends. I've seen this video where they took a sports car around a track, set a time, then removed the diffuser and drove it around again, and the diffuser was worth about 5 seconds a lap!
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If the weight of it is pulling your car down, and the downforce generated by it is going to pull your car down even more, what say you?
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yes the weight and the downforce weigh down the car's speed. but the extra grip allows the car to take corners at higher speed, hence compensating for that earlier loss. (trade-off)Originally posted by ditzy:If the weight of it is pulling your car down, and the downforce generated by it is going to pull your car down even more, what say you?
the optimal amount of downforce will be considered by the track nature. if it's more of straights, then less downforce for the car to achieve higher speeds. if it's windy and is full of corners, then more downforce needed to allow the car to take the turns at higher speeds. that's why there're so complex calculations behind the scenes.
based on what i gather from F1, listening to the commentators. correct me if i'm wrong. -
sounds similar to my sch-learnt physics of fluids. textbook used the cross-section shape of the aeroplane's wing (curved top; flat bottom) as an example. in this instance it creates lift. i reckon the car's rear spoiler has the upside-down shape (flat top; curved bottom) of the plane's wing, hence creating downforce. so the rear diffuser works on this same concept?Originally posted by Kuali Baba:The rear diffuser is designed to reduce the air pressure under the carthrough the way it directs air flow and increases air speed. The air pressure above the car becomes relatively greater, and pushes the car downwards. The downforce increases the friction, and hence the available grip, of your tyres.
It won't improve your aerodynamic efficiency because it generates a big wash behind the car...nothing lots of power can't sort out. -
The design's more complicated than that, but the result and principle are still the same.Originally posted by Theatre Of Dreams:sounds similar to my sch-learnt physics of fluids. textbook used the cross-section shape of the aeroplane's wing (curved top; flat bottom) as an example. in this instance it creates lift. i reckon the car's rear spoiler has the upside-down shape (flat top; curved bottom) of the plane's wing, hence creating downforce. so the rear diffuser works on this same concept?
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What ever it is, i have in on my car...ahhaha...nice..zhng my car. Personal choice actually.
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it's like those suction cups, u remove the air underneath and it sticks onto the wall.Originally posted by Theatre Of Dreams:sounds similar to my sch-learnt physics of fluids. textbook used the cross-section shape of the aeroplane's wing (curved top; flat bottom) as an example. in this instance it creates lift. i reckon the car's rear spoiler has the upside-down shape (flat top; curved bottom) of the plane's wing, hence creating downforce. so the rear diffuser works on this same concept?
so it's the same concept of constantly removing air underneath the object. -
haha no la suction cups remove the air underneath hence creating vacuum. atmospheric pressure hence forces the cup to the wall.Originally posted by TwinTurbo_Supra:it's like those suction cups, u remove the air underneath and it sticks onto the wall.
so it's the same concept of constantly removing air underneath the object. -
Personally, I think unless you're able to or dare take the risks of driving above 200Kmh, that rear difuser is just there for looks.
Besides, Rally cars and or sedan cars are bulky enough for weight, the additional downforce would only increase fuel consumption at slow speeds, as well as high speeds.
F1 cars are super light, hence the need for winds on both front and rear ends. Otherwise they are very apt to flip upwards at high speeds.
F1 cars can travel upside down in a tunnel because of these front and rear wings. But that's if it is driven up to 300kmh and above. -
160km/h actually.Originally posted by ShutterBug:F1 cars can travel upside down in a tunnel because of these front and rear wings. But that's if it is driven up to 300kmh and above. -
same here. besides, nobody makes them 4 my carOriginally posted by nOrmalbOi:different strokes for different folks i guess.. but to me.. it is pretty much useless.. -
talking bout flying cars, ive seen a GT racing wer this car actually flied due to the slipstream of the front carOriginally posted by ShutterBug:Personally, I think unless you're able to or dare take the risks of driving above 200Kmh, that rear difuser is just there for looks.
Besides, Rally cars and or sedan cars are bulky enough for weight, the additional downforce would only increase fuel consumption at slow speeds, as well as high speeds.
F1 cars are super light, hence the need for winds on both front and rear ends. Otherwise they are very apt to flip upwards at high speeds.
F1 cars can travel upside down in a tunnel because of these front and rear wings. But that's if it is driven up to 300kmh and above. -
not due to the slipstream. due to the turbulance vortex generated by the aerodynamics of the car in front. But sometimes its due to a mistake in the design of the aerodynamics of the car itself. Anyone remember Mark Webber and his flippin Merc CLR?Originally posted by SBS9828X:talking bout flying cars, ive seen a GT racing wer this car actually flied due to the slipstream of the front car