Performance Suspension front sway vs M3

kaputt · 02-05-2020, 06:05 PM

So I have the 128i Performance Suspension installed on my car (along with M3 rear subframe bushing and M3 front control arms). This suspension came with a different front sway bar than the stock M Sport one.

However, a common mod I see on here is the M3 front sway bar (both coupe and convertible) and I am curious if anyone knows how much of a difference there might be between the PS bar and either the M3 coupe or M3 convertible bars?

I'm really looking to know if adding either of these would make a tangible difference? For what its worth my car is 90% street with so far averaging 1 or 2 autocross events a year just for grins (not competition).

Appreciate any help!

Thunderguts · 02-05-2020, 11:34 PM

Interesting. I'm running a nearly identical setup. Next on my list is rear M3 subframe bushings. I nearly bought the M3 front sway, but decided to try the BMWP first.

I haven't been able to fully flog my new setup yet because of the cold weather, but I hope that I've eliminated any understeer (-1.1° in the front and square 225 tires). I wouldn't think the M3 bar would get me much unless, surprisingly, I still have any understeer.

02-05-2020, 06:05 PM	#1
kaputt Captain 685 Rep 648 Posts Drives: 128i 6MT - sold Join Date: Sep 2013 Location: TX -> CA iTrader: (1)	Performance Suspension front sway vs M3 So I have the 128i Performance Suspension installed on my car (along with M3 rear subframe bushing and M3 front control arms). This suspension came with a different front sway bar than the stock M Sport one. However, a common mod I see on here is the M3 front sway bar (both coupe and convertible) and I am curious if anyone knows how much of a difference there might be between the PS bar and either the M3 coupe or M3 convertible bars? I'm really looking to know if adding either of these would make a tangible difference? For what its worth my car is 90% street with so far averaging 1 or 2 autocross events a year just for grins (not competition). Appreciate any help!
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02-05-2020, 11:34 PM	#2
Thunderguts Captain 776 Rep 992 Posts Drives: 2009 128i Sport MT Join Date: Jul 2018 Location: DFW iTrader: (0)	Interesting. I'm running a nearly identical setup. Next on my list is rear M3 subframe bushings. I nearly bought the M3 front sway, but decided to try the BMWP first. I haven't been able to fully flog my new setup yet because of the cold weather, but I hope that I've eliminated any understeer (-1.1° in the front and square 225 tires). I wouldn't think the M3 bar would get me much unless, surprisingly, I still have any understeer.
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