Rear sway bar upgrade

Discussion in 'Gen 2 Prius Accessories & Modifications' started by caravan2429, Nov 24, 2018.

  1. caravan2429

    caravan2429 New Member

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    After searching for chassis upgrade for gen 2 Prius on Priuschat and some related forums, I just replaced stock rear sway bar with stock gen 1 Pontiac Vibe GT one, and found out huge difference with handling! I feel more stable and better cornering balance. No more wiggly swerve. Let's see the difference: solid and heavier bar compared to original lighter and hollow bar. Bolts in and out directly without mod. Just need tools to loose and install. Take 20 mins to do. The used part cost me $15 roughly. Budget upgrade!

    Does anyone know more about Matrix/Vibe rear sway bar thickness and design?
    Is there difference between Corolla/Matrix/Vibe bars?
    Are Matrix XRS/Vibe GT bars larger than regular Matrix/Vibe?

    The upper one is Vibe GT's. The below is Prius Base.
    [​IMG]

    More comparison:

    [​IMG]

    [​IMG]

    [​IMG]

    After installation on my car:

    [​IMG]
     
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  2. 69shovlhed

    69shovlhed Surly tree hugger

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    i think the vibe rear bar is the same as corolla. unsure about the front bar, but if it is the same, go back to the junkyard and get the front bar too. the front bar is more difficult to replace, but it to will make a fantastic difference. also you may find the car wants to fishtail if you hit a corner too fast. the front bar will balance it out.
     
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  3. HOWFAST

    HOWFAST Junior Member

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    Nice find. I ended up getting a rear sway bar off of a Touring model. I am currently waiting to pull the 03-08 Toyota Corolla front sway bar. 24mm over our little 20mm sway bar.

    Gus//
     
  4. caravan2429

    caravan2429 New Member

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    The stock Prius is well-known as "crazily-understeering", I am not sure if I just put on rear bar, it will correct too much understeering to be more neutral?
    After installing the bar, I feel the rear axle is kind of heavier, stable and sometimes agile when cornering at higher speed. No more tail shaking and soft feeling.
    If I also put on front bar, will it remain the property as "crazily-understeering"? As far as I know, if you put stiffer front far on, then you will get more understeering, right?
     
  5. caravan2429

    caravan2429 New Member

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    What is the difference of sway bar between Base and Touring models? According to Toyota Parts eStore, I found out the part numbers are the same with both models? And even I take a look at Touring rear bar, I don't see much difference with Base model? I only know the struts are different.
     
  6. HOWFAST

    HOWFAST Junior Member

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    I have no factual measurements from my self personally. I read it on here from the other post I was looking at.

    Link: Cheap suspension upgrade: Front and rear sway bar? | PriusChat

    Something was posted about the rear being 19mm on a base model and 20mm on a touring. 20mm front sway bar and the Touring having a 22mm. Seems the only factual info has been the Corolla front sway bar.

    I can tell you the 16 inch tires from the Touring make a difference.

    Gus//
     
  7. 69shovlhed

    69shovlhed Surly tree hugger

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    handling is pretty predictable with both bars upgraded. slight understeer, whereas replacing just the rear seemed to my butt dyno to give it a little oversteer. it felt like the back end wanted to slide out if i cornered too fast.
    if the rear touring bar is hollow like the base bar is, its not gonna do much. the corolla rear bar is a forging and should definitely help.
     
  8. 69shovlhed

    69shovlhed Surly tree hugger

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    duplicate post
     
  9. valde3

    valde3 Senior Member

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    I would say that just changing the rear anti-roll bar to the one from Corolla (European model but is there a difference?) just reduced understeer and did not make it oversteer by itself. This is on European model with 16” rims (so basically a Touring model). But is there really difference in front anti-roll bar?

    With the upgraded anti-roll bar it’s just easier to make it oversteer by for example using lift off oversteer or some other driving “tricks” but it does not really want to oversteer by itself. I did test this by driving around ice race tracks. Stability control system seems to allow understeer without really doing anything but then limiting oversteer as almost soon as it’s induced.
     
    #9 valde3, Dec 7, 2018
    Last edited: Dec 7, 2018
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