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Old 08-21-2019, 08:27 PM   #11
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Originally Posted by mac.mogul View Post
You're assuming the arm length is the same which it likely isn't.

It's something like ~120% stiffer than the stock bar... (if my math is right)

It's not smart to just slap on a part from a completely different car just because it 'fits' But try it, I don't care. Just telling you what I know about suspension balance.

And FWIW, yes I DO know the Eibach bar specs because I have that kit installed with the Ford Racing springs which are a little stiffer than the Sportline springs.

It's also worth pointing out that the MS3 spring rates are even higher... The torsional strength of that 26mm bar is way way way too high for our cars. It just is. I'm done arguing about it.
Well that escalated quickly... did not think anyone was arguing, just discussing information.

He has the sport line suspension kit, on a 07 sedan. (if he running a stock OEM front bar also? OP does not say) Also the sedan is on the heaver side of the focus spectrum (Focus is 2600ish lbs vs 2800 lbs of MS3) (compared to the Mk1 Hatch backs). 200 lbs ... at least per google searching curb weight of xxxx and seeing the results.

you are comparing 120% stiffer than OEM of 21mm. whats the % of difference from the Eibach ones? How different is the geometry and effective spring rates due to the arm lengths, positions, etc on the MS3? depending on those things the stiffer springs may have a similar effective spring rate.

I don't know either the arm, but if its a direct fit, the arms cant be that much longer due to how the links connect to the control arms.

There was a Steeda race/competition rear swaybar that was even larger at 28.5 mm (this yes was intended for track use). its about balance and what you want in the car and then re learning how it may behave.

I would call anything in the 24mm to 26 mm to be a mild bar being that OEM is 21 and the Steed racing one was 28.5mm. (Steeda recommended using a 22mm or larger front bar with the 28.5mm rear bar, which is now discontinued so this may be a good option if it works out to be stiffer that Eibach)

There are many Auto-X set ups that will remove the front swaybar all together and run a rear swaybar because of the rules for SCCA. If you know how it changes the balance of the car then you adjust the driving style as needed.

I hope further discussion can be had.
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Old 08-30-2019, 09:35 AM   #12
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So I've had the speed3 rear sway bar in with the stock front bar for about a week now and so far the car handles great. Not really any of this oversteer problem I've heard about, seems very balanced. Maybe the ball joint style mazda endlinks are more forgiving or something. All I can say is this is definitely a worthwhile mod for how cheap everything was.
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