1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Fitting a cabriolet with uprated ARBs - guidance needed

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by endlessheadroom, Sep 20, 2013.

  1. endlessheadroom

    endlessheadroom New Member

    Joined:
    Sep 20, 2013
    Messages:
    14
    Likes Received:
    1
    Hello there fellow Audi folk

    I'm new round here but have a question:

    I've got an a4 cabriolet. I love the car but feel it could be a bit tighter in the handling department!

    Having replaced a broken rear spring today the car feels better - but its got me thinking: should I uprate the ARBs and if so, with what?

    Help please with some advice and options.
    I recall some mention of RS4 ARBs being good - but does this really make any difference or is it just snake oil?

    Likewise, whats the general cost for this?

    Thanks
     
  2. Google AdSense Guest Advertisement



    to hide this advert.
  3. Macdoon

    Macdoon Well-Known Member

    Joined:
    Jan 20, 2010
    Messages:
    1,757
    Likes Received:
    457
  4. endlessheadroom

    endlessheadroom New Member

    Joined:
    Sep 20, 2013
    Messages:
    14
    Likes Received:
    1
    Thats helpful.
    Mine is an S line, so will probably need to go for the RS4 on the rear only
     
  5. g00se

    g00se Active Member

    Joined:
    Nov 16, 2010
    Messages:
    268
    Likes Received:
    26
    #4 g00se, Sep 21, 2013
    Last edited: Sep 21, 2013
    endlessheadroom likes this.
  6. jimbooboo

    jimbooboo Member

    Joined:
    Apr 9, 2013
    Messages:
    148
    Likes Received:
    9
    How does it cancel it out?
     
  7. jdp1962

    jdp1962 Grumpy Old Moderator
    Staff Member Moderator Audi S4

    Joined:
    May 26, 2003
    Messages:
    6,857
    Likes Received:
    1,431
    Anti roll bars increase roll stiffness on the axle to which they are fitted. Increasing roll stiffness makes the car corner more flatly, but it also increases the "slip-angle", which means a reduction in outright tyre grip on the affected axle.

    So, if you add a thicker anti-roll to the front of the car, you increase front roll stiffness (and increase front tyre slip angles) relative to the rear, so the car understeers more in corners. Audis already have prominent understeer becase the engine sits ahead of the front axle line (or as Clarkson once described it, it's like having a dead horse tied to the front bumper.

    But if you add a thicker anti roll bar to the back of the car and leave the front unchanged, you increase rear roll stiffness (and increase rear tyre slip angles) relative to the front, so the car understeers less in corners, and that's much nicer.

    If you add thicker bars front and back, they cancel each other out.
     
    Tolak, endlessheadroom and g00se like this.
  8. g00se

    g00se Active Member

    Joined:
    Nov 16, 2010
    Messages:
    268
    Likes Received:
    26
  9. endlessheadroom

    endlessheadroom New Member

    Joined:
    Sep 20, 2013
    Messages:
    14
    Likes Received:
    1
  10. g00se

    g00se Active Member

    Joined:
    Nov 16, 2010
    Messages:
    268
    Likes Received:
    26
    I got mine from Eddie at WOT Motorsport (on here).. he is an offcial 034 importer.. i think i paid 250 all in iirc (inc VAT, import duty, shipping etc) - great service

    i have mine on the softer setting, and its still way stiffer than the 22mm RS4 bar was :rock:

    goose
     

Share This Page