Rear sway bar?
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This is a discussion on Rear sway bar? within the Suspension & Wheels forums, part of the Tech & Modifying & General Repairs category; I'm looking to upgrade the rear sway bar but I'm trying to keep the ride comfortable since it's on my ...

  1. #1
    Registered User JA1904's Avatar
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    Rear sway bar?

    I'm looking to upgrade the rear sway bar but I'm trying to keep the ride comfortable since it's on my daily driver. I was thinking a Perrin 19mm. What do you guys think???


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    zax
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    What year and model of car? 19mm is a pretty small swaybar even if it's the solid variety.

    I'm a fan of the 25mm up front, 22mm rear swaybars. You'll need endlinks as well.
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    Registered User JA1904's Avatar
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    Its a 2013 WRX


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    zax
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    I'd recommend 25mm up front, 22mm rear. Solid endlinks all the way around.

    What I actually did was adjustable 22mm at both ends, stiff up front and middle in the rear... it saved me money to buy the 22mm package.
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    Registered User JA1904's Avatar
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    So are end links a must if I only want to do the rear?


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    Registered User A265's Avatar
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    Why do you only want to do the rear? WRX's are known to understeer, a front bar will be more beneficial to keep that in check.

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    Registered User JA1904's Avatar
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    Quote Originally Posted by A265 View Post
    Why do you only want to do the rear? WRX's are known to understeer, a front bar will be more beneficial to keep that in check.
    I was told by a few dudes that a rear upgrade alone was a huge improvement.


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    Do both. The real magic happens with the front. I've gone through a few different setups. Perrin 25mm solid up front, medium setting (2 settings), rear Hotchkis 25mm hollow at medium setting (3 settings). More bar up front is indeed better.
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    zax
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    Quote Originally Posted by JA1904 View Post
    I was told by a few dudes that a rear upgrade alone was a huge improvement.


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    Let me inject some reality into their statements.

    Upgrading to a larger rear sway bar will allow the back end to step out more during hard cornering. However, this is still considered under-steer since the trajectory of the car still tends towards the outside of the corner. For proper handling, you should do both front and rear swaybars.

    In reality, an upgraded front swaybar helps do dial out understeer more than an upgraded rear swaybar.
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    I did a 19mm bar from an STI on the rear of my 11 WRX (cheapest rear bar you can buy) and a whiteline front 22mm and I love how my car drives. So predictable, very stable. I don't race or auto x. Just a daily driver. If I was doing it again I would do it the same. On the stock springs/Struts it is a good balance and is much better than stock IMO. I did kartboy endlinks all round as well. The few times I have pushed it too far the car slid very neutral, more like a 4-wheel drift than any loss of control.

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    Registered User STiDriven's Avatar
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    Mac-Strut cars with high center of gravity and relatively soft springs (i.e. Imrpezas) combine for terrible suspension geometry. What happens when the car rolls during hard cornering - camber rolls from negative to positive. On top of that, lack of caster means when you turned the wheel to begin with; you were already loosing camber.

    So - despite what the 'books' say or the 'internet' the biggest front sway bar you can throw on the car (given the car has stock springs) will give you more overall grip than a rear sway; as you are able to maintain more negative camber by preventing roll.

    Now.... once you upgrade springs or go coil-overs, you can get too much front bar. But stock springs your only limit is ride quality.

    Remember - a bigger rear sway alone isn't adding more overall cornering grip; by itself, it is removing rear grip. Why do you think big rear bars make the rear end step out?? If you really want to make the car 'faster' always work to add grip in the front (the steering end) and use the rear to balance per driving style.
    Last edited by STiDriven; 09-27-2013 at 10:31 PM.

  13. #12
    Registered User JA1904's Avatar
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    Thank you guys for the input, you guys and this forum are invaluable.


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    Registered User KOUPATROOPA's Avatar
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    Is the 19 even any bigger than the stock rear bar? Just curious.
    I got dual 22mm Perrin adjustable bars and the rear is on medium while the front is on full hard and I love it.
    Look around for some used bars so you can afford to get both front and rear, you will be happier that way.

  15. #14
    Registered User JA1904's Avatar
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    Quote Originally Posted by KOUPATROOPA View Post
    Is the 19 even any bigger than the stock rear bar? Just curious.
    I got dual 22mm Perrin adjustable bars and the rear is on medium while the front is on full hard and I love it.
    Look around for some used bars so you can afford to get both front and rear, you will be happier that way.
    How comfortable is the ride?


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  16. #15
    tax
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    I have the eibach kit for 2 yrs now. No end links just front and rear anti roll bars. The car is not a mule to drive any more and understeer is all but gone. There is no compromise in ride comfort, there is a slight worsening in steering feel (barely noticeable) and the car tends to be less forgiving at the limits; eg when exiting a ramp or turning on a curve and u hit a bump u might feel the whole car moving a few inches away from the apex more so than before. But man it gets transformed! They should be fitted with larger sway bars from the factory.

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