[SaviorXi]

Originally Posted by JaysBlueE92

my bushings are shot..perhaps control arm too. So the rear m3 bits will work on xi? Pricy but Worth it

Well worth the cost and since your stock ones are shot you have to pay the huge labor cost even if you go stock again. You might as well get the M ones.

[JaysBlueE92]

Originally Posted by SaviorXi

Well worth the cost and since your stock ones are shot you have to pay the huge labor cost even if you go stock again. You might as well get the M ones.

Yeh that was my other question..What I am looking at install cost on this? Should I change out my front bushings as well as rears? My car is high mileage and I've been on KW V3s for the most part.

I'm hoping I can get the parts for around $500 and maybe pay around the same for install?

[MSport35TT]

I surprised many have not done this already. I have V3s with M3 sways and handles of what it should have been since the beginning of owning the car

[SaviorXi]

Originally Posted by JaysBlueE92

Yeh that was my other question..What I am looking at install cost on this? Should I change out my front bushings as well as rears? My car is high mileage and I've been on KW V3s for the most part.

I'm hoping I can get the parts for around $500 and maybe pay around the same for install?

I have no idea of the install cost since my best friend is a mechanic and he did it for free. I would say about 5 hours shop time for the install. I did not change the front bushings since mine are fine and I don't think there is M specific front bushings.

[SaviorXi]

Originally Posted by MSport35TT

I surprised many have not done this already. I have V3s with M3 sways and handles of what it should have been since the beginning of owning the car

I did not think the M sways alone made much difference. The M bushings really transformed the cars handling though.

[lunchbox]

http://www.ecstuning.com/BMW-E90-335...Bar/ES2622885/

the ecs kit for this includes more than the sway bar and the bushings.

OEM sway bar
OEM bushings (2)
OEM bushing bracket (2)
OEM hardware (2 nuts 6 bolts)
OEM sway bar links (2)


Can I assume all of those parts are off the m3? Any idea what the OEM part numbers are?

[ajsalida]

You just need the bar, bushings, and brackets. Shop around, I got a kit from ReevesBMW (vendor here) for 200 shipped. Go to realoem for P/N's and shop prices, or ask around for a kit. There are two bars available, one is for the coupe/sedan one is for the convertible. Get the coupe one, it is a bit thinner than the vert but I read the vert is too stiff for our cars.

It is a non trivial install, you must drop the subframe to get it in and even then it is not easy. On the subframe bushings, that is an even harder job, you may consider popping in some poly type bushing insert/stiffeners, either powerflex or whiteline make them. I went with the latter, same thing and less than half price of p-flex. Either are vastly easier install than OEM once the subframe is dropped. Seems to work well with the bar.

Having done this already I would advise not do the bar without some sort of bushing upgrade, they are just too soft and a bigger bar would make that worse (bar is attached entirely to subframe and other parts attached to subframe, as is the rest of the suspension so if you stiffen up the susp it just transfers higher loads thru subframe bushings to car).

http://www.whiteline.com.au/product_..._number=KDT918

[lunchbox]

Sounds good to me, I figure when I do the new springs and shocks Ill do the rear sway. For $50 bucks and time invested might as well do the bushings. My buddies a Mechanic and will be ordering the bar + parts for me. Hopefully his cost will be cheap!

Have you seen any additional vibration with the stiffer bushings?

[ajsalida]

Hard to parse out what was due to what WRT bushings vs bar since I did them both at the same time. However no additional vibration, just a more planted feel and of course a hell of a lot less understeer. On washboard surfaces (dirt) I noticed LESS vibration/harshness as the susp was doing all the work instead of subframe wallowing around and interfering with motion control.

Before I did this I didn't really believe some of the other complaints about the OEM bushings, but now yeah they are too soft esp with any type of susp or power upgrade.

[thegrinchboy]

Originally Posted by ajsalida

Hard to parse out what was due to what WRT bushings vs bar since I did them both at the same time. However no additional vibration, just a more planted feel and of course a hell of a lot less understeer. On washboard surfaces (dirt) I noticed LESS vibration/harshness as the susp was doing all the work instead of subframe wallowing around and interfering with motion control.

Before I did this I didn't really believe some of the other complaints about the OEM bushings, but now yeah they are too soft esp with any type of susp or power upgrade.

Just put in UUC front and rear sways, the body roll has mostly disappeared but some jumpiness and body shift are back... Probably should have stiffen up the subframe bushings as well... Managed to roll the softer sidewalls of the DWS tires on the on-ramp the other day.

[ajsalida]

Originally Posted by thegrinchboy

Just put in UUC front and rear sways, the body roll has mostly disappeared but some jumpiness and body shift are back... Probably should have stiffen up the subframe bushings as well... Managed to roll the softer sidewalls of the DWS tires on the on-ramp the other day.

Sucks mon. What pressures in the DWS? Are the UUC bars hollow? Rear M3 coupe bar is larger diameter than UUC (22.5 mm vs 19.5) but it is hollow. Does not feel like too much bar at all. I was thinking of going UUC front at some point as it is the only option for XI if I am not mistaken. Also rear UUC bar is adjustable (2 holes) it may be worth putting at soft end if it isn't already.

I run 38-40 lbs cold in my DWS, at least until winter sets in. Firmed up the front Konis to 1 full turn off full soft to compensate for the stiffer rear end. Seems good.

[thegrinchboy]

Originally Posted by ajsalida

Sucks mon. What pressures in the DWS? Are the UUC bars hollow? Rear M3 coupe bar is larger diameter than UUC (22.5 mm vs 19.5) but it is hollow. Does not feel like too much bar at all. I was thinking of going UUC front at some point as it is the only option for XI if I am not mistaken. Also rear UUC bar is adjustable (2 holes) it may be worth putting at soft end if it isn't already.

I run 38-40 lbs cold in my DWS, at least until winter sets in. Firmed up the front Konis to 1 full turn off full soft to compensate for the stiffer rear end. Seems good.

I will most likely softening up the rear UUC and putting the bushing stiffeners at the same time, as you did. Just have to order them and schedule time to everything done again. That's the maddening aspect of this. I almost didn't bother with this part, as I finally just got the ride to what I wanted, except for the body roll at high speed, and that I had already purchased the bars...

My DWS were at 38/41 warm. Increased it to 41/45 warm as I was already at a gas station. Will check again after the tires cool.

[J3]

Anyone on here have the h&r sways??
I'm thinking why not 23mm...?

http://www.e90post.com/forums/showthread.php?t=973627

[junniior95]

Originally Posted by lunchbox

http://www.ecstuning.com/BMW-E90-335...Bar/ES2622885/

the ecs kit for this includes more than the sway bar and the bushings.

OEM sway bar
OEM bushings (2)
OEM bushing bracket (2)
OEM hardware (2 nuts 6 bolts)
OEM sway bar links (2)


Can I assume all of those parts are off the m3? Any idea what the OEM part numbers are?

I know it's a little late, would this upgrade fit my 2011 e90xi? And also was it worth the upgrade? I'm buying KW V1's and just want the most out of the handling. Also want to upgrade my subframe bushings, havnt done my research to much but if you guys have any suggestions that'd be great

[The Red Baron]

I have access to an e90 m3, that was hit on the side really good, body is junk but the rear suspension is gold. Now i dont assume there is anything different in the rear suspension between the e90/92 m3 models, but what parts should i be looking to get off of it while im removing things? My car is a 335XI, and i have an e3p project ill be using the engine and DIFF in. Ive claimed the diff, and definitely wanted the rear sway bar. Should i just take the entire rear suspension? Subframe and all?

[Julian2485]

Originally Posted by MSport35TT

I surprised many have not done this already. I have V3s with M3 sways and handles of what it should have been since the beginning of owning the car

Do you have m3 front and rear swaybars on your car ?

[Julian2485]

Originally Posted by SaviorXi

I did not think the M sways alone made much difference. The M bushings really transformed the cars handling though.

Do you have m3 front and rear swaybars on your car ?

[hz_diesel]

Slightly confused. I keep seeing posts of the m3 e92 rear sway being 20mm but isn't it 22.5mm and the m3 e93 is a 23.6mm which is too thick... or are you using a sway from an older m3? I think the e46 was a 20mm.