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Old 04-21-2013, 08:57 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, 09:28 PM   #2
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And are they solid or hollow?
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Old 04-21-2013, 11:22 PM   #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, 06:25 PM   #4
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What is the stock front sway bar size?
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Old 04-22-2013, 06:31 PM   #5
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18mm solid.

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Old 04-22-2013, 08:50 PM   #6
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The rear is pathetic.
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Old 04-22-2013, 11:16 PM   #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 04-22-2013, 11:27 PM   #8
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Old 04-23-2013, 07:01 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, 07:21 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.
Don't quit your day job.
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Old 04-23-2013, 08:12 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, 08:17 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, 08:18 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, 09:07 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, 10:07 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, 07:04 AM   #16
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Don't quit your day job.
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, 10:55 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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Old 04-24-2013, 03:20 PM   #18
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I played around with a 19mm STi rear bar and it was nuts. TC light was getting really annoying.

This was with 235s (Federal 595SS), I wouldn't have dared on the stock tires. Even then, I was not comfortable pushing the car.

I also have a 22mm bar from the STi that I'm too wussy to even try...what a difference -600# can make!
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Old 04-24-2013, 11:59 PM   #19
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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.
You know there is something between A and Z, right? You also do realise things like tyres play a huge part into bar selection?

I did some track time last night with the 16mm rear bar on stock Michelin tyres. In a tight circle, 1st gear, the rear inside tyre is breaking traction. In a larger, 2nd gear circle it's not. That's probably more to do with the diff than the bar.

With stickier tyres on (i'll re-test with my AD08's) this effect will most likely be less, depending on roll angle.

It really depends on what you're trying to achieve. I've not stated that changing the rear bar is the right thing to do for everyone. But then not everyone in the world is doing 1/2nd gear auto-x events in American parking lots.
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Old 04-25-2013, 07:17 AM   #20
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^^ The inside tire is breaking traction in really tight corners because it's an LSD and putting power through it makes both wheels want to spin the same speed. At low speeds and really tight radii the speed difference is enough and the gearing is short enough to cause a bit of scratching at the pavement. At higher speeds and larger radii the forces aren't the same and the speed difference between the wheels isn't as big.

I'm not talking about breaking traction, I'm talking about the inside tire being visibly off the ground because the rear bar is too stiff and the springs aren't stiff enough. Just throwing on stiff sway bars without stiff enough springs does funky things to the handling.

Remember that the way a sway bar works is to couple the sides together, so if the outside spring is compressing the bar is making the inside spring compress too, which takes weight off the inside tire.

Big rear bars can work on FWD cars that need help rotating, but they put power down through the front wheels so it doesn't matter if a rear wheel is in the air.

Putting a bigger rear bar on a RWD car will do nothing but hurt traction when exiting a corner, and since these cars don't need help rotating into a corner it's not helping anywhere.

FWD car, but it paints a picture. Big stiff sway bars, not enough spring rate (I know the owner of the car, and he used this same picture on another forum to prove what I'm saying). Look at the body roll he's getting. If this were a RWD car, how much power do you think that inside tire would put to the pavement?
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Old 04-25-2013, 07:34 AM   #21
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No doubt that Honda has reduced droop due to some crappy coilovers too.

You can't make blanket statements when it comes to handling. Even the suspension engineers are OEM's and race teams need to do testing, even with complex simulation on a computer.

I'm not sure what point you're trying to get across, you appear to be arguing with blanket statements, where i've clearly explained there is more than just black and white. Hopefully some people reading this will realise it's the grey area that counts.
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Old 04-25-2013, 09:39 AM   #22
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I think the point is clear. Its rear wheel drive. You need the drive wheels on the ground to go fast.

I think the confusion comes from the car being from Subaru, a WRX needs a big rear sway bar cause it likes to understeer.
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