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Old 03-26-2004, 05:20 PM   #1
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Read if you plan on upgrading to the SVT rear sway

As some of you know I've been hellbent on finding an SVT rear sway to swap into my PZEV. Well I was talking with a buddy of mine who owns an SVT, and he said the bar is the same diameter as the stock ZX3, and that Ford achieved a stiffer rear end by "keying the bushings" on the bar. I'm not sure exactly what he meant by that, but he went on to say this was why he didn't switch to poly mounts for the rear sway - it would apparently lose its extra stiffness. If this is the case then I'll be going for the Progress bar. Just FYI for anyone looking to upgrade.

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Old 03-26-2004, 05:36 PM   #2
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You would be surprised how tight a car will handle if you do a complete eurethane bushing set and a spring/dampner set.
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Old 03-26-2004, 05:42 PM   #3
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Originally posted by Egz
The simple equation for torsion stiffness of a bar, based on diameter alone is OD^4 - ID^4 , where OD is the outer diameter, and ID is the inner diameter. Assuming all the bars are solid, I get this:

Bar      Size(mm)  Size(in)  Relative Stiffness(in^4)  Increase over stock
Stock       20      .787           .383                           0%
SVT         21      .826           .465                          21%
Progress    22      .866           .562                          46%
H&R         24      .944           .794                         107%
Eibach      25      .984           .938                         144%
And the Progress is 21% stiffer than the SVT, and the Eibach is 18% stiffer than the H&R.
So Egz was def right.........good thing to know knight...thanks for the info...............

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Old 03-26-2004, 06:52 PM   #4
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I'm fairly certain the SVT rear sway bar is 21mm. I had one, and I swore I measured it.
2003 Ford Focus ZX3 2.3l N/A = 221 HP, 162 ft-lbs, 13.967@100.88MPH - SOLD
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Old 03-27-2004, 09:52 PM   #5
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I put the svt sway bar on my pzev and like it . I also installed svt springs. There is stiffer stuff around but I wanted some compliance left in my suspension especially since I run 17-40s.Also I think its cool that if I brought my car in for warentee work I wouldnt take any guf for doing mods as its all Ford stuff. Also Ford has some good engineers who came up with a nice car like the focus and svt and I like using that pool of talent.
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