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      05-29-2016, 07:32 PM   #1
cedric5555
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Question XI suspension upgrade advise on E92 xi.

Sorry guys. I know this has been covered for many times. I am a noob and I want to have all the right parts ready before dropping the car to my local mechanic for installation to save the charge.

I live in NYC. I have the 2010 E92 335XI with 49k miles. I have searched many posts and I think I will go for Eibach and Koni yellow setup.
I want to put the M3 sway bar and M3 subframe bushing as other people suggested.
I have OEM 19" 220M M3 rims with continental DWS tires. I had the fender roll on the rear.
I did the search on the forum but still have many things unsure.

I have a couple questions to ask:

1) Is the Eibach spring and Koni okay with the rear space gap since I have 19" staggered M3 rims and not that much of space left on the rear (around 1 inch).

2) which M3 sway bar should I use? I see 22.5mm and 23.6mm.
22.5mm
https://www.ecstuning.com/ES248879/?...RYwaAnCC8P8HAQ

23.6mm
https://www.ecstuning.com/ES2622885/...9nAaAui88P8HAQ

3) Do I need the whole package which included sway bar links and bushing bracket from above? Or I just need the sway bar alone and reuse the the links and bracket from my car?

4) I see people also suggest to use bump stops E36M3 part#3133 2225 377 for front and Z4 for rear. I did the search on the forum and was confused about the rear. Should I get the Z4 part# 3353 6770 350 or Z4M part#33507836826 bump stop?

https://www.ecstuning.com/b-genuine-...h/33536770350/

https://www.ecstuning.com/b-genuine-...r/33507836826/


5) Should I get the UCC front sway bar? I heard its about the same size of the stock so I am not sure how it will improve over stock front sway bar. For those installed the UCC fornt with M3 rear sway, any comments?
25.5mm
http://store.uucmotorwerks.com/swayb...ly--p1323.aspx

6) I saw people saying the UCC front sway bar comes with bushing. If I don't upgrade the UCC front sway bar, do I still need to get the new bushing for front?

7) Do I need to get new Control Arm Bushing?
http://www.e90post.com/forums/showth...1108425&page=2

8) Do I need front strut tower brace, front endlinks, front/rear control arms...etc?

9) What else am I missing for the suspension upgrade? Please advise. I need to know what part is must get and what is optional.

10)
Are the below is must when chaning M3 sway and subframe bushing?
- M3 Rear Guide Rods
- M3 Rear Upper Links
- M3 Rear Lower Camber Kit
- M3 Front Strut Brace
Thanks!

11) TC Kline VS Eibach/Koni yellow. I heard people are saying TC Kline is the best. Which one is better in NYC/NJ rough roads? Any comments?

Sorry for so many dummy questions. I really appreciate for the great help. Thanks a million.

Last edited by cedric5555; 05-29-2016 at 09:40 PM.
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      05-29-2016, 10:05 PM   #2
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I have TC Kline coilovers, single adjustable front, dual adjustable rear. Installed M3 rear subframe bushings at the same time (no other M3 parts) and I am very happy. It's no where near as good as my E36 M3 TC Kline setup but I wouldn't expect it to be (xi is almost 400 lbs heavier , a very different chassis).

This is not an inexpensive setup and I don't have experience with other setups on this platform but I doubt you'll get a lot better performance without spending a lot of money.

Car is dead solid and very streetable on decent pavement. I recently drove into my first big hole and it was not earth shattering.

The Strongflex polyurethane tension strut upgrade seems to be the way to go. I ordered and received mine without the metal inserts and grease which are on their way from Poland so I cannot really comment but my research bears out the value of the upgrade.
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      06-01-2016, 09:46 AM   #3
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Quote:
Originally Posted by OffensiveDriver
I have TC Kline coilovers, single adjustable front, dual adjustable rear. Installed M3 rear subframe bushings at the same time (no other M3 parts) and I am very happy. It's no where near as good as my E36 M3 TC Kline setup but I wouldn't expect it to be (xi is almost 400 lbs heavier , a very different chassis).

This is not an inexpensive setup and I don't have experience with other setups on this platform but I doubt you'll get a lot better performance without spending a lot of money.

Car is dead solid and very streetable on decent pavement. I recently drove into my first big hole and it was not earth shattering.

The Strongflex polyurethane tension strut upgrade seems to be the way to go. I ordered and received mine without the metal inserts and grease which are on their way from Poland so I cannot really comment but my research bears out the value of the upgrade.
Strongflex upgrade def made a difference up front. You will love it.
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      06-01-2016, 09:47 AM   #4
Julian2485
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Quote:
Originally Posted by cedric5555
Sorry guys. I know this has been covered for many times. I am a noob and I want to have all the right parts ready before dropping the car to my local mechanic for installation to save the charge.

I live in NYC. I have the 2010 E92 335XI with 49k miles. I have searched many posts and I think I will go for Eibach and Koni yellow setup.
I want to put the M3 sway bar and M3 subframe bushing as other people suggested.
I have OEM 19" 220M M3 rims with continental DWS tires. I had the fender roll on the rear.
I did the search on the forum but still have many things unsure.

I have a couple questions to ask:

1) Is the Eibach spring and Koni okay with the rear space gap since I have 19" staggered M3 rims and not that much of space left on the rear (around 1 inch).

2) which M3 sway bar should I use? I see 22.5mm and 23.6mm.
22.5mm
https://www.ecstuning.com/ES248879/?...RYwaAnCC8P8HAQ

23.6mm
https://www.ecstuning.com/ES2622885/...9nAaAui88P8HAQ

3) Do I need the whole package which included sway bar links and bushing bracket from above? Or I just need the sway bar alone and reuse the the links and bracket from my car?

4) I see people also suggest to use bump stops E36M3 part#3133 2225 377 for front and Z4 for rear. I did the search on the forum and was confused about the rear. Should I get the Z4 part# 3353 6770 350 or Z4M part#33507836826 bump stop?

https://www.ecstuning.com/b-genuine-...h/33536770350/

https://www.ecstuning.com/b-genuine-...r/33507836826/


5) Should I get the UCC front sway bar? I heard its about the same size of the stock so I am not sure how it will improve over stock front sway bar. For those installed the UCC fornt with M3 rear sway, any comments?
25.5mm
http://store.uucmotorwerks.com/swayb...ly--p1323.aspx

6) I saw people saying the UCC front sway bar comes with bushing. If I don't upgrade the UCC front sway bar, do I still need to get the new bushing for front?

7) Do I need to get new Control Arm Bushing?
http://www.e90post.com/forums/showth...amp;amp;page=2

8) Do I need front strut tower brace, front endlinks, front/rear control arms...etc?

9) What else am I missing for the suspension upgrade? Please advise. I need to know what part is must get and what is optional.

10)
Are the below is must when chaning M3 sway and subframe bushing?
- M3 Rear Guide Rods
- M3 Rear Upper Links
- M3 Rear Lower Camber Kit
- M3 Front Strut Brace
Thanks!

11) TC Kline VS Eibach/Koni yellow. I heard people are saying TC Kline is the best. Which one is better in NYC/NJ rough roads? Any comments?

Sorry for so many dummy questions. I really appreciate for the great help. Thanks a million.
M3 rear subframe bushing with rear m3 swaybar and swaybar bushings made a big difference on my car. Now I added coilovers and love my car even more. I didn't change any arms in the rear. Only upgrade I have in the front are the strongflex tension bushings. If I find a good prices used uuc front bar I'll buy it.
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      06-01-2016, 10:22 AM   #5
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You should get the bushings with the sway bars.

UUC comes with the bushings. I'm actually getting one for my Xi. I'll be trying it without the Rear sway bar upgraded first.
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      06-01-2016, 10:32 AM   #6
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Quote:
Originally Posted by Julian2485 View Post
M3 rear subframe bushing with rear m3 swaybar and swaybar bushings made a big difference on my car. Now I added coilovers and love my car even more. I didn't change any arms in the rear. Only upgrade I have in the front are the strongflex tension bushings. If I find a good prices used uuc front bar I'll buy it.
I did a similar upgrade path (22.5mm M3 rear bar) and found w/o bigger front bar way too much snap oversteer. Like a scary amount. Added UUC front bar nice and neutral now.
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      06-01-2016, 11:13 AM   #7
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Rear bump stops you should use Z4M which are 33507836826. There was some confusion with other part numbers because they were Z4 3.0si M Sport but you want the actual Z4M which again, are 33507836826.

The stock front sway bar maximum diameter is 26.5mm but it steps down to a thinner diameter in the middle. The UUC front sway bar is 25.5mm but same diameter all the way through and thus stiffer than stock. You can see pics here.

For the M3 rear sway bar you need the bar and bushings/brackets at minimum. The stiffer of the two M3 bars is from the convertible. It's probably too stiff. The rear end links are the same on both cars but either way the stock end links are weak and can break, especially if you lower the car. So it's good to get at the very least, new stock links. Hotchkis makes adjustable end links for the rear sway bar.

To change the rear sway bar you need to drop the subframe, which is why people also do rear subframe bushings at the same time. But it's a good amount of labor for each of these items.

The main reason people do M3 rear links is to get the stiffer bushings. If you do the M3 rear camber links you need M3 rear shocks. I personally am keeping the stock rear arms and upgrading the subframe bushings (along with the front control arm bushings).

Rear shock mounts are good to upgrade as well, which you can do with Monroe part # 907984 for the upper mount and 907985 for the lower mount. They are rubber, but stiffer than stock.

Personally I am doing:

Koni FSD shocks (2100 4123)
B&G S2 springs (08.1.166)
Ground Control E90 xi camber plates
http://www.ground-control-store.com/.../II=897/CA=269
2x Strongflex front control arm bushings (031528)
http://www.strongflex.eu/en/45-e90-e91-e92-xi-4x4-05-11 (yellow are a bit stiffer than red--I went with red)
2x E36 M3 front bump stops (31332225377)
2x Z4M rear bump stops (33507836826)
UUC front & rear sway bars + front end links
http://store.uucmotorwerks.com/swayb...ly--p1323.aspx
Hotchkis rear adjustable end links (25834R)
http://www.hotchkis.net/product/2007...rt-suspension/
Whiteline rear subframe bushing inserts (KDT918)
2x BMW front upper spring pads (31336767500)
2x BMW front lower spring pads (31336764372)
2x BMW front dust boots (31331094749)
2x BMW rear upper spring pads (33536764419)
2x BMW rear lower spring pads (33536764420)
2x Monroe rear upper shock mounts (907984)
2x Monroe lower shock mounts (907985)

Some folks have said the Koni FSDs can have undesirable behavior but they are supposed to have a softer ride than the yellows and I'm taking a slight gamble that they will behave the way I want with my choice of springs, bump stops, and rear shock mounts.

FYI to everyone about the UUC front bar: right now they are out of front sway bar bushings. I have a front & rear set on order and last Thursday 5/26 they told me they should have more bushings in 2-3 weeks.

Last edited by AtlasM; 06-01-2016 at 11:28 AM.
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      06-01-2016, 11:22 AM   #8
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Quote:
Originally Posted by AtlasM View Post
Rear bump stops you should use Z4M which are 33507836826. There was some confusion with other part numbers because they were Z4 3.0si M Sport but you want the actual Z4M which again, are 33507836826.

The stock front sway bar maximum diameter is 26.5mm but it steps down to a thinner diameter in the middle. The UUC front sway bar is 25.5mm but same diameter all the way through and thus stiffer than stock. You can see pics here.

For the M3 rear sway bar you need the bar and bushings/brackets at minimum. The stiffer of the two M3 bars is from the convertible. It's probably too stiff. The rear end links are the same on both cars but either way the stock end links are weak and can break, especially if you lower the car. So it's good to get at the very least, new stock links. Hotchkis makes adjustable end links for the rear sway bar.

To change the rear sway bar you need to drop the subframe, which is why people also do rear subframe bushings at the same time. But it's a good amount of labor for each of these items.

The main reason people do M3 rear links is to get the stiffer bushings. If you do the M3 rear camber links you need M3 rear shocks. I personally am keeping the stock rear arms and upgrading the subframe bushings (along with the front control arm bushings).

Rear shock mounts are good to upgrade as well, which you can do with Monroe part # 907984 for the upper mount and 907985 for the lower mount. They are rubber, but stiffer than stock.

Personally I am doing:

Koni FSD shocks (2100 4123)
B&G S2 springs (08.1.166)
Ground Control E90 xi camber plates
http://www.ground-control-store.com/.../II=897/CA=269
2x Strongflex front control arm bushings (031528)
http://www.strongflex.eu/en/45-e90-e91-e92-xi-4x4-05-11 (yellow are a bit stiffer than red--I went with red)
E36 M3 front bump stops (31332225377)
Z4M rear bump stops (33507836826)
UUC front & rear sway bars + front end links
http://store.uucmotorwerks.com/swayb...ly--p1323.aspx
Hotchkis rear adjustable end links (25834R)
http://www.hotchkis.net/product/2007...rt-suspension/
Whiteline rear subframe bushing inserts (KDT918)
2x BMW front upper spring pads (31336767500)
2x BMW front lower spring pads (31336764372)
2x BMW front dust boots (31331094749)
2x BMW rear upper spring pads (33536764419)
2x BMW rear lower spring pads (33536764420)
2x Monroe rear upper shock mounts (907984)
2x Monroe lower shock mounts (907985)

Some folks have said the Koni FSDs can have undesirable behavior but they are supposed to have a softer ride than the yellows and I'm taking a slight gamble that they will behave the way I want with my choice of springs, bump stops, and rear shock mounts.

FYI to everyone about the UUC front bar: right now they are out of front sway bar bushings. I have a front & rear set on order and last Thursday 5/26 they told me they should have more bushings in 2-3 weeks.
Great post.

I'm also in the same boat with UUC. Was hoping to get that sway bar installed a few weeks ago.

If you guys need anything feel free to drop me a line. Hotchkis, Koni, Bilstein, UUC, ETC
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      06-01-2016, 02:34 PM   #9
Julian2485
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Quote:
Originally Posted by Jeff@TopGearSolutions
Quote:
Originally Posted by AtlasM View Post
Rear bump stops you should use Z4M which are 33507836826. There was some confusion with other part numbers because they were Z4 3.0si M Sport but you want the actual Z4M which again, are 33507836826.

The stock front sway bar maximum diameter is 26.5mm but it steps down to a thinner diameter in the middle. The UUC front sway bar is 25.5mm but same diameter all the way through and thus stiffer than stock. You can see pics here.

For the M3 rear sway bar you need the bar and bushings/brackets at minimum. The stiffer of the two M3 bars is from the convertible. It's probably too stiff. The rear end links are the same on both cars but either way the stock end links are weak and can break, especially if you lower the car. So it's good to get at the very least, new stock links. Hotchkis makes adjustable end links for the rear sway bar.

To change the rear sway bar you need to drop the subframe, which is why people also do rear subframe bushings at the same time. But it's a good amount of labor for each of these items.

The main reason people do M3 rear links is to get the stiffer bushings. If you do the M3 rear camber links you need M3 rear shocks. I personally am keeping the stock rear arms and upgrading the subframe bushings (along with the front control arm bushings).

Rear shock mounts are good to upgrade as well, which you can do with Monroe part # 907984 for the upper mount and 907985 for the lower mount. They are rubber, but stiffer than stock.

Personally I am doing:

Koni FSD shocks (2100 4123)
B&G S2 springs (08.1.166)
Ground Control E90 xi camber plates
http://www.ground-control-store.com/.../II=897/CA=269
2x Strongflex front control arm bushings (031528)
http://www.strongflex.eu/en/45-e90-e91-e92-xi-4x4-05-11 (yellow are a bit stiffer than red--I went with red)
E36 M3 front bump stops (31332225377)
Z4M rear bump stops (33507836826)
UUC front & rear sway bars + front end links
http://store.uucmotorwerks.com/swayb...ly--p1323.aspx
Hotchkis rear adjustable end links (25834R)
http://www.hotchkis.net/product/2007...rt-suspension/
Whiteline rear subframe bushing inserts (KDT918)
2x BMW front upper spring pads (31336767500)
2x BMW front lower spring pads (31336764372)
2x BMW front dust boots (31331094749)
2x BMW rear upper spring pads (33536764419)
2x BMW rear lower spring pads (33536764420)
2x Monroe rear upper shock mounts (907984)
2x Monroe lower shock mounts (907985)

Some folks have said the Koni FSDs can have undesirable behavior but they are supposed to have a softer ride than the yellows and I'm taking a slight gamble that they will behave the way I want with my choice of springs, bump stops, and rear shock mounts.

FYI to everyone about the UUC front bar: right now they are out of front sway bar bushings. I have a front & rear set on order and last Thursday 5/26 they told me they should have more bushings in 2-3 weeks.
Great post.

I'm also in the same boat with UUC. Was hoping to get that sway bar installed a few weeks ago.

If you guys need anything feel free to drop me a line. Hotchkis, Koni, Bilstein, UUC, ETC
How much for uuc front bar for 335xi?
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      06-02-2016, 10:07 AM   #10
cedric5555
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I would like to say thanks to everyone who posted their comments here. Specially thanks to AtlasM for the detail information. It helps me a lot.
Any more comments are welcome to post here.
Thank you!!
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      06-19-2016, 08:08 PM   #11
cedric5555
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If I do tckline coilover instead, do I still need the e36 m3 front amd z4m rear bump stops and the below items??

E36 M3 front bump stops (31332225377)
Z4M rear bump stops (33507836826)
2x BMW front upper spring pads (31336767500)
2x BMW front lower spring pads (31336764372)
2x BMW front dust boots (31331094749)
2x BMW rear upper spring pads (33536764419)
2x BMW rear lower spring pads (33536764420)
2x Monroe rear upper shock mounts (907984)
2x Monroe lower shock mounts (907985)

http://www.tcklineracing.com/webdocs...Details690.cfm





Thanks for the reply.
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