BMW M3 convertible sways for 1M

CarJunkie · 04-18-2015, 08:31 AM

Anyone using the M3 convertible sway bars as an upgrade who would like to share impressions?

MDORPHN · 04-19-2015, 03:55 PM

Yes, I'm running the E93 front sway for 2+ years and feel it gives me a bit more grip in back.

Neil

HP Autosport · 05-16-2015, 12:52 PM

Yes, an excellent upgrade as stated by Neil.

luial · 05-17-2015, 06:43 PM

Is the suggestion just for the fronts or all around?

MDORPHN · 05-17-2015, 07:52 PM

Quote:

Originally Posted by luial

Is the suggestion just for the fronts or all around?

Fronts only. Gives a bit more grip in back.

Neil

CarJunkie · 05-23-2015, 09:31 AM

Quote:

Originally Posted by MDORPHN

Fronts only. Gives a bit more grip in back.

Neil

On an otherwise stock car, isn't that going to worsen the balance of the car? I haven't decided whether to do camber plates yet, so understeer is still an issue.

HP Autosport · 05-23-2015, 12:38 PM

Quote:

Originally Posted by CarJunkie

On an otherwise stock car, isn't that going to worsen the balance of the car? I haven't decided whether to do camber plates yet, so understeer is still an issue.

Tune the chassis with other means and leave the sway bar last.

mattm · 05-24-2015, 04:19 PM

I've got a vert bar that I installed in early 2012. Still there.

ayao · 04-27-2016, 11:51 PM

Bumping this thread to solicit a little more in the way of opinions on this.

I've read all the threads I can find and I have to admit that I'm a little confused about why a thicker bar up front improves rear grip.

Also seek clarification on the effect of a thicker front bar on understeer.

CarJunkie · 04-29-2016, 10:00 AM

Well, now you are asking about suspension tuning 101 . . .

It has to do with GRIP EFFICIENCY. Increasing the load on a tire will increase its grip, but not in a linear way. Increasing the load on the tire by 50% may only increase its grip by 30%.

As an example, suppose you have ONLY a front sway bar. In a hard right hand turn, a stiffer front sway bar will add load to the left front tire while removing load from the right front tire. A very stiff bar, as the most extreme example, would lift the right tire off the road, which would obviously reduce its grip to zero. Despite its increased load, the left front tire would not replace all of the grip taken from the right front tire. At the same time, the rear tires are benefiting from the reduced body roll, maintaining more optimal angles to the road surface, while being able to maintain a more balanced share of the load.

04-18-2015, 08:31 AM	#1
CarJunkie Colonel 2617 Rep 2,819 Posts Drives: e82 1M, f87 M2cs Join Date: Nov 2011 Location: Tri-Cities, Washington iTrader: (1) Garage List 2020 M2cs [0.00] 2011 BMW 1M [0.00]	BMW M3 convertible sways for 1M Anyone using the M3 convertible sway bars as an upgrade who would like to share impressions?
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04-19-2015, 03:55 PM	#2
MDORPHN Colonel 291 Rep 2,898 Posts Drives: AW 1M Join Date: Oct 2010 Location: Wash, DC iTrader: (0)	Yes, I'm running the E93 front sway for 2+ years and feel it gives me a bit more grip in back. Neil
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05-16-2015, 12:52 PM	#3
HP Autosport Supreme Allied Commander 3843 Rep 54,362 Posts Drives: F80 M3 Join Date: Mar 2007 Location: Santa Barbara, AP, Brembo, GIAC, Koni, Ohlins, Performance Friction, www.hpautosport.com iTrader: (36)	Yes, an excellent upgrade as stated by Neil.
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05-17-2015, 06:43 PM	#4
luial Private First Class 5 Rep 120 Posts Drives: 1///M, e46 M3, e30 320is ///M3 Join Date: Apr 2010 Location: PH iTrader: (0)	Is the suggestion just for the fronts or all around?
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05-24-2015, 04:19 PM	#8
mattm Captain 59 Rep 630 Posts Drives: Join Date: Aug 2008 iTrader: (0)	I've got a vert bar that I installed in early 2012. Still there. __________________ Matt Murray I am perfectly capable of learning from my mistakes. I will surely learn a great deal today.
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04-27-2016, 11:51 PM	#9
ayao Thread killer 642 Rep 1,896 Posts Drives: 1M Join Date: Aug 2011 Location: CA iTrader: (2)	Bumping this thread to solicit a little more in the way of opinions on this. I've read all the threads I can find and I have to admit that I'm a little confused about why a thicker bar up front improves rear grip. Also seek clarification on the effect of a thicker front bar on understeer.
	Appreciate 0 Quote

04-29-2016, 10:00 AM	#10
CarJunkie Colonel 2617 Rep 2,819 Posts Drives: e82 1M, f87 M2cs Join Date: Nov 2011 Location: Tri-Cities, Washington iTrader: (1) Garage List 2020 M2cs [0.00] 2011 BMW 1M [0.00]	Well, now you are asking about suspension tuning 101 . . . It has to do with GRIP EFFICIENCY. Increasing the load on a tire will increase its grip, but not in a linear way. Increasing the load on the tire by 50% may only increase its grip by 30%. As an example, suppose you have ONLY a front sway bar. In a hard right hand turn, a stiffer front sway bar will add load to the left front tire while removing load from the right front tire. A very stiff bar, as the most extreme example, would lift the right tire off the road, which would obviously reduce its grip to zero. Despite its increased load, the left front tire would not replace all of the grip taken from the right front tire. At the same time, the rear tires are benefiting from the reduced body roll, maintaining more optimal angles to the road surface, while being able to maintain a more balanced share of the load.
	Appreciate 1 Quote