Too much body roll at high speed

nikitino25 · 02-29-2016, 05:22 PM

I currently have KW clubsport coilovers installed on my car and have them adjusted to just slightly softer than the mfr's recommendations. I like the way they feel for the most part but have noticed that I get more body roll than I would like at high speeds on the highway when changing lanes quickly for instance. The car basically feels a little "wobbly" and has too much body roll (for my taste) when making any turning inputs at high speed. I also currently have the front sway bar from the BMW performance kit installed in front and just the stock sport sway bar in the rear. Will upgrading my front and rear sway bar to say M3 bars or other stiffer bars solve my problem and mitigate the high speed body roll I'm encountering? Car does corner pretty flat at lower speeds though and feels pretty good....I'm talking 100+ mph though

Cloud9blue · 02-29-2016, 05:50 PM

M3 front sway. Said and done. I used to have the BMW Performance front sway before as well. It was barely any stiffer than the stock ZSP bar.

Don't bother with the rear sway though, especially if you don't have LSD.

nikitino25 · 02-29-2016, 09:37 PM

Quote:

Originally Posted by Cloud9blue

M3 front sway. Said and done. I used to have the BMW Performance front sway before as well. It was barely any stiffer than the stock ZSP bar.

Don't bother with the rear sway though, especially if you don't have LSD.

I do have a Quaife LSD actually.....I have heard that a stiffer rear sway can lessen acceleration traction say coming out of a turn but I'm more concerned with high speed stability.....I guess I will try the M3 front bar first and see how it feels since changing out the rear bar is such a pain in the ass. It just seems like it would maybe unbalance the car if you did the front and not the rear?

Cloud9blue · 02-29-2016, 09:38 PM

Quote:

Originally Posted by nikitino25

Quote:

Originally Posted by Cloud9blue

M3 front sway. Said and done. I used to have the BMW Performance front sway before as well. It was barely any stiffer than the stock ZSP bar.

Don't bother with the rear sway though, especially if you don't have LSD.

I do have a Quaife LSD actually.....I have heard that a stiffer rear sway can lessen acceleration traction say coming out of a turn but I'm more concerned with high speed stability.....I guess I will try the M3 front bar first and see how it feels since changing out the rear bar is such a pain in the ass. It just seems like it would maybe unbalance the car if you did the front and not the rear?

Not on my car. I run M3 front and stock rear. Two season of track days, even felt the car was unbalanced.

nikitino25 · 02-29-2016, 11:58 PM

I will try just the M3 front sway bar first and report back. I could also adjust my coilovers more to the stiffer side which I think might help some but I'm looking for more of a ride/handling balance (or compromise I guess with at least some semblance of ride comfort but definitely leaning more to the handling side) and with not much stiffer damping settings, the ride is becoming too harsh. This is with KW clubsports btw....

gtaccord · 03-01-2016, 06:10 AM

Don't forget the rear subframe bushings....

I had a similar problem and fixed it by adding an m3 rear sway bar only.

Tom Droze · 03-01-2016, 07:32 AM

I believe you want to use the M3 e93 front sway bar, it is 28mm and a bit thicker and stiffer than the M3 e92 front sway bar.

If you don't do the M3 rear subframe bushings, at least do the rear subframe bushing inserts. There is a lot of improvement for a little bit of money.

Cloud9blue · 03-01-2016, 09:38 AM

Quote:

Originally Posted by nikitino25

I will try just the M3 front sway bar first and report back. I could also adjust my coilovers more to the stiffer side which I think might help some but I'm looking for more of a ride/handling balance (or compromise I guess with at least some semblance of ride comfort but definitely leaning more to the handling side) and with not much stiffer damping settings, the ride is becoming too harsh. This is with KW clubsports btw....

I think the feedbacks on both e9x and f8x KW club sport is that they ride on the stiff side even when dialed down. So don't think you can do much about the comfort with these.

Cloud9blue · 03-01-2016, 09:40 AM

Quote:

Originally Posted by Tom Droze

I believe you want to use the M3 e93 front sway bar, it is 28mm and a bit thicker and stiffer than the M3 e92 front sway bar.

If you don't do the M3 rear subframe bushings, at least do the rear subframe bushing inserts. There is a lot of improvement for a little bit of money.

Yeah. Do the subframe bushing if you haven't done so already. Makes a big difference in how the car respond during weight transfer.

nikitino25 · 03-01-2016, 09:45 AM

Yes, I do already have the M3 subframe bushings....

feuer · 03-01-2016, 12:04 PM

Quote:

Originally Posted by nikitino25

Yes, I do already have the M3 subframe bushings....

I'm assuming the KW clubsport coilovers are new.
I also assume that you have good alignment.
If not that might contribute to car being unstable at hwy speeds.
It will feel as too much body roll as it will demand too much correction on the steering.

nikitino25 · 03-01-2016, 12:59 PM

The clubsports are relatively new and in good shape and I just had an alignment done. The car doesn't feel unstable or anything, just has more body roll than I think it should at high speed....maybe I'm asking for too much but I think I will try an M3 front sway first to see what difference it makes.....I also plan on adjusting my front camber plates to a more negative setting in the near future; I know I will need another alignment after I do this....

02-29-2016, 05:22 PM	#1
nikitino25 Captain 91 Rep 817 Posts Drives: '07 E92 335i Join Date: Dec 2011 Location: Missouri iTrader: (2)	Too much body roll at high speed I currently have KW clubsport coilovers installed on my car and have them adjusted to just slightly softer than the mfr's recommendations. I like the way they feel for the most part but have noticed that I get more body roll than I would like at high speeds on the highway when changing lanes quickly for instance. The car basically feels a little "wobbly" and has too much body roll (for my taste) when making any turning inputs at high speed. I also currently have the front sway bar from the BMW performance kit installed in front and just the stock sport sway bar in the rear. Will upgrading my front and rear sway bar to say M3 bars or other stiffer bars solve my problem and mitigate the high speed body roll I'm encountering? Car does corner pretty flat at lower speeds though and feels pretty good....I'm talking 100+ mph though Last edited by nikitino25; 03-01-2016 at 09:15 PM..
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02-29-2016, 05:50 PM	#2
Cloud9blue Brigadier General 711 Rep 3,251 Posts Drives: around the potholes Join Date: Aug 2008 Location: NY/NJ/MA iTrader: (13)	M3 front sway. Said and done. I used to have the BMW Performance front sway before as well. It was barely any stiffer than the stock ZSP bar. Don't bother with the rear sway though, especially if you don't have LSD. __________________ 09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List] 07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization
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02-29-2016, 11:58 PM	#5
nikitino25 Captain 91 Rep 817 Posts Drives: '07 E92 335i Join Date: Dec 2011 Location: Missouri iTrader: (2)	I will try just the M3 front sway bar first and report back. I could also adjust my coilovers more to the stiffer side which I think might help some but I'm looking for more of a ride/handling balance (or compromise I guess with at least some semblance of ride comfort but definitely leaning more to the handling side) and with not much stiffer damping settings, the ride is becoming too harsh. This is with KW clubsports btw.... Last edited by nikitino25; 03-01-2016 at 12:05 AM..
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03-01-2016, 06:10 AM	#6
gtaccord Major 56 Rep 1,464 Posts Drives: 2009 BMW 335xi Join Date: Feb 2012 Location: Maryland iTrader: (7) Garage List 2009 BMW 335i xdrive [0.00]	Don't forget the rear subframe bushings.... I had a similar problem and fixed it by adding an m3 rear sway bar only.
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03-01-2016, 07:32 AM	#7
Tom Droze Major 413 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	I believe you want to use the M3 e93 front sway bar, it is 28mm and a bit thicker and stiffer than the M3 e92 front sway bar. If you don't do the M3 rear subframe bushings, at least do the rear subframe bushing inserts. There is a lot of improvement for a little bit of money.
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03-01-2016, 09:45 AM	#10
nikitino25 Captain 91 Rep 817 Posts Drives: '07 E92 335i Join Date: Dec 2011 Location: Missouri iTrader: (2)	Yes, I do already have the M3 subframe bushings....
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03-01-2016, 12:59 PM	#12
nikitino25 Captain 91 Rep 817 Posts Drives: '07 E92 335i Join Date: Dec 2011 Location: Missouri iTrader: (2)	The clubsports are relatively new and in good shape and I just had an alignment done. The car doesn't feel unstable or anything, just has more body roll than I think it should at high speed....maybe I'm asking for too much but I think I will try an M3 front sway first to see what difference it makes.....I also plan on adjusting my front camber plates to a more negative setting in the near future; I know I will need another alignment after I do this....
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