Rear diffuser
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This is a discussion on Rear diffuser within the Exterior & Appearance forums, part of the Tech & Modifying & General Repairs category; Anyone have a picture of the varis rear diffuser for thev2013 wrx......if anyone knows where I can purchase it also ...

  1. #1
    Registered User sbl30's Avatar
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    Rear diffuser

    Anyone have a picture of the varis rear diffuser for thev2013 wrx......if anyone knows where I can purchase it also please provide the info.....

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    Moderator rage-wrx's Avatar
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    At $500-$600 it seems like a huge waste of money for something that goes under your car & has little to no functionality.
    T0ny
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    Hell on Wheels Rodman's Avatar
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    Registered User sbl30's Avatar
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    Yea I did google it...i wanted a picture of the rear end of the car with the back end facing me not at an angle.....

    rage: how do you know it does not work?

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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by sbl30
    rage: how do you know it does not work?
    How do you know it does? It's the responsibility of the company to prove there's a positive gain to account for their price tag. If you're solely interested in aesthetics, that's fine. It's not up to us to convince you it does/doesn't offer you a performance gain...
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  9. #8
    Registered User Scoob1318's Avatar
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    Does the varis diffuser fit on the hatch?

  10. #9
    Moderator rage-wrx's Avatar
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    In principle a rear diffuser is used to increase air flow under the car thereby creating a low pressure that then sucks the car to the ground to increase downforce. I doubt Varis spent millions on wind tunnel testing the parts for aero efficiency. If it were as simple as slapping on a rear diffuser for more downforce, racing companies wouldn't be spending millions on car design.

    Of course it may look cool. But these cars have many ways of going faster around a corner & the money spent will give you functional mods with a lot more satisfaction of being inside the car driving it rather than looking at it from the outside.
    T0ny
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    Ooh,hang on. That is the throb of a turbocharged flat four engine. A sound which,all over the world,heralds the imminent arrival of a moron - JC.

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    Registered User Orestes85's Avatar
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    Judging by the depth, I'd say that it does have some functionality (obviously not as much as a purpose made diffuser) but it's definitely not just an aesthetic item. They also make purpose built aero items for time attack teams so I would wager that the knowledge they gain from that venture would carry over to their products aimed for street use.
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  12. #11
    Moderator rage-wrx's Avatar
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    Quote Originally Posted by Orestes85 View Post
    Judging by the depth, I'd say that it does have some functionality (obviously not as much as a purpose made diffuser) but it's definitely not just an aesthetic item.
    Maybe at speeds exceeding 100mph or on the track but not for everyday use. If you look at race cars the entire bottom floor has been covered by a flat plate that directs flow to the rear diffuser that then channels air, increasing flow towards the rear to increase down force. So anything with just a rear diffuser would cause turbulence IMO. Plus look at time attack car rear diffusers. They are all parallel & close to the ground & do not have an upward direction as in that diffuser in the pic.

    I am not doubting the company. But F1 teams spend millions in wind tunnel testing on rear diffusers. Especially in the last couple of years. And even many of them couldn't get it right.

    No offense to the OP. It is his money & he can do what he wishes. But personally there are thousands of $ of mods I would do before getting to a rear diffuser.
    T0ny
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    The Big 2011/2012 Mod Thread


    Ooh,hang on. That is the throb of a turbocharged flat four engine. A sound which,all over the world,heralds the imminent arrival of a moron - JC.

  13. #12
    Registered User Orestes85's Avatar
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    Oh, I have no doubt it does little to nothing on the street.
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  14. #13
    Registered User sbl30's Avatar
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    I worked as an aerodynamic engineer once......I'll find out the specs and just calculate to see if there is a difference or not......everyone has an opinion but there is no data that shows it doesn't work.....and didn't check to see if there was any that proves it does work....fact over opinion.

  15. #14
    Moderator rage-wrx's Avatar
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    Doesn't work doing what? What is it supposed to do? A difference in what?
    T0ny
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    The Big 2011/2012 Mod Thread


    Ooh,hang on. That is the throb of a turbocharged flat four engine. A sound which,all over the world,heralds the imminent arrival of a moron - JC.

  16. #15
    Registered User Ruh Roh's Avatar
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    i think they look nice..would i buy a Carbon fiber one? no. would i buy an ebay one. maybe one day. but i think they look nice and most likely no street performance gains, its a nice looking piece IMO.
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