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Underbody aerodynamics, diffuser ...

Discussion in 'Tech Archive (No Posting)' started by FreeOfThoughts, May 24, 2010.



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  1. FreeOfThoughts

    FreeOfThoughts The joy of driving Registered VIP 5+ Year Member

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    So i was looking through a Car and Driver and read all about the ridiculous aerodynamics in the Ferrari 599XX track car, like underbody vents that go through the trunk and out where the rear tail lights used to be and generates over 1400lbs. of downforce at top speed

    check it http://www.youtube.com/watch?v=PHjeW37Nrpk.

    (or lapping the ring in under 7 - http://www.youtube.com/watch?v=FJj8atDGBzk )

    I was bored and got the idea that i should change the underside of my car to have better airflow underneath. Has anyone tried this with body pans, ducting, diffusers (not the ones with holes in your rear bumper), or the like? Figured it would be worth a shot and not too expensive if i make it myself. Any educated suggestions or examples welcome, thanks
     
  2. R3dline

    R3dline F*** you. Registered VIP Registered OG 5+ Year Member

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    you drive a civic man, not a ferrari, you dont need downforce. dont waste your time or money on that monkey looking bs, leave to the ferraris
     
  3. got traction

    got traction i rock the sohc Registered VIP Registered OG 5+ Year Member 10+ Year Member

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    its not needed. We trap at 170 mph in the quarter, and have done zero aerodynamic modifications.
     
  4. Z3R)

    Z3R) New Member 5+ Year Member

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    i guess you didnt read where he was talking about a track car not a dragster.

    if you were talking about high speed cornering or time trial type racing id say it would help alot. otherwise its not really worth it.
     
  5. FreeOfThoughts

    FreeOfThoughts The joy of driving Registered VIP 5+ Year Member

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    alright, i didn't think i would have to many jump on this but yes i am talking about high speed cornering and it does help a lot. Low pressure underneath + high pressure on top = downforce (traction at velocity). I might just play with it, and see if it makes any difference and if it does i win if not i will just take it off. I figured they have full underbody kits for s2000's and the like so why not my car, right.
     
  6. graffbc

    graffbc New Member 5+ Year Member

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    im looking for one myself...i saw a orange EK at EiBach last year with one...it looked awesome. i do alot of canyon runs and i see alot of S2k's with them...if you find one let me know.
     
  7. Kensai

    Kensai ♪♫♪♫♪~ Registered VIP Registered OG 5+ Year Member

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    OEM sti one fits I think
     
  8. ekracer_83

    ekracer_83 hardcore rice Registered VIP 5+ Year Member 10+ Year Member

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    are you thinking of doing high speeds in your neighbors?
     
  9. rebirth

    rebirth New Member 5+ Year Member

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    Funny thing is I read that same ad, and i have been trying to find a diffuser ever since. All I can find is that silver 5 holes in your bumper look which is pretty damn ugly if you ask me. I really want a rear diffuser, and a Air Walker front bumper.
     
  10. FreeOfThoughts

    FreeOfThoughts The joy of driving Registered VIP 5+ Year Member

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    I have read somewhere that the WRX diffusers can be retro fitted. Spoon sports has used an s2000 diffuser on their ek9's, and i saw someone do that to a '96 hatchback, but i don't know how that would fit my coupe.

    http://www.jdmuniverse.com/forums/a.../70069-spoon-sport-k20-ek9-rear-diffuser.html

    The spoon sports diffuser is sexy but over $1000. PWD: JDM has a full carbon underbody kit for the s2000, it would be the closest thing i could work from, their kit is their kit is over $3k, i am hoping to touch a couple hundred bucks, but i would be using lightweight aluminium or maybe some fiberglass not carbon fiber.

    http://www.hondatuningmagazine.com/tech/htup_0809_honda_s2000_diffuser/photo_01.html
     


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