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Suspension | Chassis | Brakes Relating to suspension, chassis, and brakes.


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Old 04-21-2013, 09:57 PM   #1
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Stock Sway Bar Sizes On FRS?

What are the stock sway bar sizes?
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Old 04-21-2013, 10:28 PM   #2
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And are they solid or hollow?
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Old 04-22-2013, 12:22 AM   #3
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Rear is 14mm, solid.

I have part numbers here for OE Impreza bars in 16, 18 and 19mm. Buying from Whiteline is cheaper though unless you can find a second-hand Impreza bar!
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Old 04-22-2013, 07:25 PM   #4
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What is the stock front sway bar size?
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Old 04-22-2013, 07:31 PM   #5
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18mm solid.

- andy
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Old 04-22-2013, 09:50 PM   #6
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The rear is pathetic.
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Old 04-23-2013, 12:16 AM   #7
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The rear is pathetic.
You're not wrong. I've gone up to a 16mm on the rear and it's still pretty poor!
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Old 04-23-2013, 12:27 AM   #8
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Old 04-23-2013, 08:01 AM   #9
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Too much stiffness from the sway bar(s) isn't a good thing... these cars are relatively light with low CG's, they don't need a stupidly stiff bar messing up the handling. You're better off with higher spring rates (and proper dampening for those rates) and stock (or no) sway bars.
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Old 04-23-2013, 08:21 AM   #10
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Too much stiffness from the sway bar(s) isn't a good thing... these cars are relatively light with low CG's, they don't need a stupidly stiff bar messing up the handling. You're better off with higher spring rates (and proper dampening for those rates) and stock (or no) sway bars.
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Old 04-23-2013, 09:12 AM   #11
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Rear is 14mm, solid.

I have part numbers here for OE Impreza bars in 16, 18 and 19mm. Buying from Whiteline is cheaper though unless you can find a second-hand Impreza bar!
A second-hand Impreza bar won't be hard to find locally for most people. Wait long enough and people give 'em away.
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Old 04-23-2013, 09:17 AM   #12
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A second-hand Impreza bar won't be hard to find locally for most people. Wait long enough and people give 'em away.
That's great if that's the case over there, but here they're like hen's teeth!
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Old 04-23-2013, 09:18 AM   #13
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That's great if that's the case over there, but here they're like hen's teeth!
Didn't look at the location; sorry. They're rather common and cheap here. I see them for sale on NASIOC all the time.
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Old 04-23-2013, 10:07 AM   #14
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Didn't look at the location; sorry. They're rather common and cheap here. I see them for sale on NASIOC all the time.
The hatchback Impreza (2008-) was reasonably popular here, but the subsequent variant is so ugly even those half-blind wouldn't buy it. I guess that's part of the reason!
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Old 04-23-2013, 11:07 AM   #15
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Only the rears swap from Impreza IIRC.

I wouldn't recommend increasing the rear without increasing the front on this car.

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Old 04-24-2013, 08:04 AM   #16
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You'd rather three wheel around a corner than put power down? Inside rear tire in the air means now power at all unless you have a clutch LSD instead of the stock one.

The absolute last thing these cars need on it's own is a stiffer rear bar. They aren't front biased FWD cars that need help rotating, they're pretty well balanced from the factory.
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Old 04-24-2013, 11:55 AM   #17
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You'd rather three wheel around a corner than put power down? Inside rear tire in the air means now power at all unless you have a clutch LSD instead of the stock one.

The absolute last thing these cars need on it's own is a stiffer rear bar. They aren't front biased FWD cars that need help rotating, they're pretty well balanced from the factory.
agreed. in FWD situation, you could pull yourself out of a corner in an oversteer situation using the front tyres. in that same situation, it wont happen in an RWD drive car unless there is grip in those rear tyres. hence, when it comes to playing around with rear roll stiffness, you really have to have a baseline on how the car handles at the limit (only possible on a track) and know what you want to do by tuning spring and roll bar and alignment incrementally. Even experimenting with wider grippier tyres can change the handling dynamic immensely without the need for any of the previous mentioned.

i wouldn't just slap on a bigger rear bar and hope for the best, not the safest thing to do.
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