what are the point of these?

[Adam_b24]

im just wondering what the big black things on the back of some racing cars are used for, and what there called.

 

[Boost Lee]

spoiler - downforce

diffuser - the purpose of the diffuser is to allow the air that has been accelerated (so that its higher speed can produce a lower pressure) under the car to decelerate back to close to the same speed and pressure it was before the car ran into it. The better the diffuser works, the less drag the underwing produces.

 

[eliseracer]

Many road cars have them. Check the Ferrari 360 or Enzo, they both have very beautiful diffusers.

 

[ND4SPD]

I don't know why, but diffusers look so beautiful to me....especially on the Oreca Viper.👍

 

[ShobThaBob]

I think in most cars, they look downright hideous. Naturally though, they aren't exactly there for show, so I don't have a real problem with them if they're actually needed. But yeah, it's all about increasing downforce and reducing the drag coefficient.

 

[eliseracer]

The next thing you'll see on Civics are these suckers. Don't be surprised, you've now been warned.

 

[Chevelle SS]

The next thing you'll see on Civics are these suckers.

I've actually already seen them on Civics. I'm honestly not surprised, after all, these people put huge spoilers on front-whell-drive cars.

 

[Victor Vance]

The Lotus Elise has one

 

[McLaren'sAngel]

spoiler - downforce

diffuser - the purpose of the diffuser is to allow the air that has been accelerated (so that its higher speed can produce a lower pressure) under the car to decelerate back to close to the same speed and pressure it was before the car ran into it. The better the diffuser works, the less drag the underwing produces.

Hiya! Meow! (='.'=)

Good definition! :cheer: now I can finally understand the REAL reason why they put them on those cars! I sadly use to thought that they were there to stop the heavey downforce when not needed...

 

[VIPFREAK]

I don't know why, but diffusers look so beautiful to me....especially on the Oreca Viper.👍

The best one I've seen. :tup:

The next thing you'll see on Civics are these suckers. Don't be surprised, you've now been warned.

yeah... but at the moment what's worse is they have this billit piece with holes that you put on the back bumper to I guess let air thru? 👍

The Lotus Elise has one

So does the Toyota Prius...

 

[neanderthal]

the rear diffuser is part of a complicated air management system to reduce drag. a well designed one can negate the need for a spoiler.

 

[I6-4-eva]

with a rear diffuser this big would it cause the front to lift up at high speeds?

 

[eliseracer]

Because it is so heavy? Yes.

 

[Dorifto]

Considering thats an SVS Viper I wouldn't doubt that it needs one.

 

[ND4SPD]

That diffuser would have looked better in carbon fibre.

 

[T100]

I think that it looks great, Here is my question, what is the type of car or when is it needed on a car?

 

[The Vanishing Boy]

There are more cars that have diffusers:
-Ford GT

-Honda [NA2] NSX-R

-[R]Chevrolet Corvette C5R

-[R]Nissan R390 LM Race Car

-[R]Dodge Viper Competition Coupe

-Lotus Elise GT-1

...well thats all I can think of besides the cars mentioned above.

-> I personally like the pic on the Elise GT-1, theres a lot of juicy cars on the background (Lotus Elan, Porsche 911 [996] GT-1, Italdesign BMW Nazca, Aston Martin V12 Vantage, and the new Audi TT 3.2 DSG).

 

[The Vanishing Boy]

The Lotus Elise has one

Agreed. 👍

And its the best looking one too:

 

[eliseracer]

The Ford GT even features one bent diffuser!!! Check out the far left slit...

 

[The Vanishing Boy]

^ I see that, I think also on the right side, thats why it looks straight is just maybe of its camera angle.

 

[eliseracer]

It doesn't matter, the production car doesn't have the ones shown.

 

[The Vanishing Boy]

^ Um, that was the production car.

Here's another pic (US-spec):

 

[altezza drifter]

i havent seen a difuser on a civic some rear bumpers have a little design that looks like one but it dosent cover the hole rear of the car so its not realy a diffuser

 

[VIPFREAK]

If I'm not mistaken doesn't the underbody work have to be "sealed" from the front of the car to the rear to take advantage of it being a "difuser" and actually working to it's full potential?

 

[neanderthal]

the diffuser best works when its part of a complicated air management strategy that includes a complete undertray. i believe it could work in isolation with negligible results.