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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Eibach sway bar 28mm worth it?



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      02-21-2021, 06:19 PM   #1
335boston
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Eibach sway bar 28mm worth it?

Hey guys !

Looking into the aftermarket solutions for a sway bar . I currently have an m3 bar in there but it's not flat enough for me in the corners . I have Dinan springs , m3 upper and lower control arms , whiteline adjustable sway bar links , and have replaced the tie rods as well! I've seen this eibach bar with bushing and for the price seems pretty good. Searched a bit seems a fan favorite is the h and r bar but has anyone tried out the eibach front bar only ? (Stock in rear) any reviews would be great ! Thanks !
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      02-21-2021, 06:24 PM   #2
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Here's a link!

https://www.turnermotorsport.com/p-3...sway-bar-28mm/
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      02-22-2021, 06:43 PM   #3
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Quote:
Originally Posted by 335boston View Post
Hey guys !

Looking into the aftermarket solutions for a sway bar . I currently have an m3 bar in there but it's not flat enough for me in the corners . I have Dinan springs , m3 upper and lower control arms , whiteline adjustable sway bar links , and have replaced the tie rods as well! I've seen this eibach bar with bushing and for the price seems pretty good. Searched a bit seems a fan favorite is the h and r bar but has anyone tried out the eibach front bar only ? (Stock in rear) any reviews would be great ! Thanks !
You really need to do both front & rear.
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      02-22-2021, 07:08 PM   #4
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https://www.e90post.com/forums/showthread.php?t=1771681
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      02-23-2021, 02:02 PM   #5
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Quote:
Originally Posted by 335boston View Post
Hey guys !

Looking into the aftermarket solutions for a sway bar . I currently have an m3 bar in there but it's not flat enough for me in the corners . I have Dinan springs , m3 upper and lower control arms , whiteline adjustable sway bar links , and have replaced the tie rods as well! I've seen this eibach bar with bushing and for the price seems pretty good. Searched a bit seems a fan favorite is the h and r bar but has anyone tried out the eibach front bar only ? (Stock in rear) any reviews would be great ! Thanks !
You can order the front and rear directly from the manufacturer.

https://eibach.com/us/1090/2085.320-...-anti-roll-kit

Remember Newton's 3rd law and you will understand why you need front & rear
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      02-23-2021, 06:34 PM   #6
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There's a lot of talk about how a front sway bar helps MacPherson setups but I can only speak for my experience. I ran a 27mm solid front bar and enjoyed it for a while due to the reduced body roll and sharpened steering. However, overtime I felt that the car wasn't as neutral as before. Upgrading the very soft rear sway bar bushings with poly helped but I'm much happier with the stock front bar back in.

You can see the rest of my suspension modifications in my garage: https://www.e90post.com/forums/bpgar...=view&id=18961
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      02-24-2021, 08:47 AM   #7
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I currently have a whiteline 27mm FSB in and noticed a small amount of understeer introduced even after upgrading to a 245 front tire.

The bar handles higher speed corners better but suffers at low speeds, more so with rough surfaces.
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      02-25-2021, 02:11 PM   #8
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Quote:
Originally Posted by freakystyly View Post
I currently have a whiteline 27mm FSB in and noticed a small amount of understeer introduced even after upgrading to a 245 front tire.

The bar handles higher speed corners better but suffers at low speeds, more so with rough surfaces.
Good point about NVH - city driving with rough uneven pavement is much more tolerable with the stock bar. My Whiteline bar had a slight edge with high speed turns such as highway ramps, but the stock bar is fine as well. I'm curious if upgrading the stock bushings to poly will help since the M-sport and M3 bushings are of a higher durometer.

If the OP finds that the M3 front bar isn't "flat" enough then they might enjoy an aftermarket bar. The Eibach bar is a good price.
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      02-25-2021, 03:19 PM   #9
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Quote:
Originally Posted by 335boston View Post
Hey guys !

Looking into the aftermarket solutions for a sway bar . I currently have an m3 bar in there but it's not flat enough for me in the corners . I have Dinan springs , m3 upper and lower control arms , whiteline adjustable sway bar links , and have replaced the tie rods as well! I've seen this eibach bar with bushing and for the price seems pretty good. Searched a bit seems a fan favorite is the h and r bar but has anyone tried out the eibach front bar only ? (Stock in rear) any reviews would be great ! Thanks !
I have the bar. I like it. I have it in the front and the rear bar is stock. The Eibach is about as large as you can get for a solid bar iirc. Some bars sold are hollow. Both F&R were made adjustable for me you can see the tabs that were welded on: https://www.e90post.com/forums/showt...5#post25439025
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      02-25-2021, 03:30 PM   #10
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Quote:
Originally Posted by Torgus View Post
The Eibach is about as large as you can get for a solid bar iirc.
AFAIK the Hotchkis front bar is 32mm but I don't see much point in going that heavy. Its all up to each others own opinion and what you're looking to get out of this mod. Your spring rates and damping should match a little closer to support the heavy bar otherwise you'll notice some weird behaviour.
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      02-25-2021, 03:53 PM   #11
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Quote:
Originally Posted by freakystyly View Post
AFAIK the Hotchkis front bar is 32mm but I don't see much point in going that heavy. Its all up to each others own opinion and what you're looking to get out of this mod. Your spring rates and damping should match a little closer to support the heavy bar otherwise you'll notice some weird behaviour.
Yes, it is hollow which some claim matters to resist twisting etc: 32mm tubular steel but it is 95% stiffer than stock. I think that is the stiffest bar I have seen advertised.

https://www.turnermotorsport.com/t-t...-e92-sway-bars

The old Eibach bar they sold was: 29mm (1.1 in) tubular, adjustable

Eibach measured bar rate: 3 position adjustable
Position1 = 52 N/mm (297 lbs/in) + 53% stiffness
Position2 = 59 N/mm (337 lbs/in) + 73% stiffness
Position3 = 64 N/mm (366 lbs/in) + 88% stiffness

I can't find what the solid 28mm bar is but I assume similar give it is solid and only 1mm less in diameter.


I agree you want it to match your suspension, sway bars, dampeners, etc. to your goals for the vehicle.

Last edited by Torgus; 02-26-2021 at 09:10 PM..
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      02-25-2021, 09:57 PM   #12
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Hey guys ! I ended up pulling the trigger on the bar ! I'll give you guys my review on this thread after ! I know a lot have mentioned that the rear is needed for a neutral set up! But the reason I'm doing this is because the car as it is now to me isn't neutral at all , so hopefully this will help!
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      02-26-2021, 08:16 PM   #13
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Quote:
Originally Posted by 335boston View Post
Hey guys ! I ended up pulling the trigger on the bar ! I'll give you guys my review on this thread after ! I know a lot have mentioned that the rear is needed for a neutral set up! But the reason I'm doing this is because the car as it is now to me isn't neutral at all , so hopefully this will help!
I think you will end up with a lot of understeer. The Eibach 28mm front sway bar is stiffer than the M3 bar.
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      02-26-2021, 08:32 PM   #14
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Quote:
Originally Posted by mweisdorfer View Post
I think you will end up with a lot of understeer. The Eibach 28mm front sway bar is stiffer than the M3 bar.
Significantly stiffer:



M3 bar according to turner is +6.96% stiffer than the stock E9x bar.
H&R 27mm solid FSWB according to turner is +52.44% stiffer than the stock E9x bar.
Eibach 28mm solid FSWB is probably more like 60% or more than the stock E9x bar.

Last edited by Torgus; 02-26-2021 at 09:13 PM..
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      02-27-2021, 04:35 PM   #15
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Quote:
Originally Posted by mweisdorfer View Post
Quote:
Originally Posted by 335boston View Post
Hey guys ! I ended up pulling the trigger on the bar ! I'll give you guys my review on this thread after ! I know a lot have mentioned that the rear is needed for a neutral set up! But the reason I'm doing this is because the car as it is now to me isn't neutral at all , so hopefully this will help!
I think you will end up with a lot of understeer. The Eibach 28mm front sway bar is stiffer than the M3 bar.
Hey ! Wouldn't it be more oversteer? Since the front will be "stiffer" than the rear bar?

The car with its current mods still understeers badly in hard cornering
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      02-27-2021, 07:02 PM   #16
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I have oe sport suspension with all-new M arms and dampers with just a front Eibach swaybar. IMO I never thought it understeer severely, to begin with, but did notice a slight increase in understeer after just the front bar but think for me the trade-off of less roll and better turn in, worth it.

from my understanding with the front bar only upgrade, it stiffens the front and forces/twists the chassis to help keep rear tires in place to aid traction with our open diff. since now you are requiring more work from the front, it naturally will understeer more so you need to compensate that by adding more grip, with more camber, more tread, or better dampers. I added more camber and plan to run a wider front in the future.
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      02-27-2021, 07:15 PM   #17
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If the e9x chassis is anything like the prior BMWs... and it should be as a rear drive front engine, strut/multi front/rear suspension....

A giant front bar will make the car considerably faster. You almost can't go too big, although the 28vs30vs32 starts to depend on how hard one trail brakes and how smooth the release is, as well as the rear bar combination.

A 32mm front with a stock rear and 600/450ish wheel rates is pretty common on the older chassis.

On the street they all pretty much suck because they tie the front tires together too tightly.

Definitely do not do with stock springs. You'll probably just end up breaking end links.
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      Today, 01:42 AM   #18
335boston
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Might be a question out of the blue but what tires are you guys running ? I'm on all season with plans to go with 4s' in the summer , and I'll prob upgrade the front to a 235 rather than the 225.

I feel as thought my car with all mods, even with the added negative camber from alignment and m3 arms , still understeers , may be caused by the less grip from the seasons?
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      Today, 05:17 AM   #19
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Quote:
Originally Posted by 335boston View Post
Hey ! Wouldn't it be more oversteer? Since the front will be "stiffer" than the rear bar?

The car with its current mods still understeers badly in hard cornering
In general more stiffness gives less grip. There are other factors involved, but that is the bottom line.
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      Today, 07:54 AM   #20
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Seek out a new set of wheels with dedicated summer / winter set up if that's in your budget.

The step to proper high performance summers alone is night and day. There's plenty of info on fitment on the tire forum but I think some people have run 255s on the front which also make a large difference. The downside is having to deal with shorter summer tire life but it's a trade off if you want grip.

If you happen to winter the car in Boston you may appreciate the added grip in winter as well.
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      Today, 11:35 AM   #21
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Quote:
Originally Posted by 335boston View Post
Might be a question out of the blue but what tires are you guys running ? I'm on all season with plans to go with 4s' in the summer , and I'll prob upgrade the front to a 235 rather than the 225.

I feel as thought my car with all mods, even with the added negative camber from alignment and m3 arms , still understeers , may be caused by the less grip from the seasons?
19'' MPSS 235/265 IIRC F&R. When they wear out I'll upgrade to their newer summers. Assuming I don't sell my 19s and get 17s and move to a more aggressive tire.

My vote is dedicated summer & winter rims and tires, assuming you drive in both.

Once you start to get up there in power give the small tires sizes we can fit a dedicated summer or more aggressive is basically required.
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      Today, 11:44 AM   #22
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Quote:
Originally Posted by Torgus View Post
Quote:
Originally Posted by mweisdorfer View Post
I think you will end up with a lot of understeer. The Eibach 28mm front sway bar is stiffer than the M3 bar.
Significantly stiffer:



M3 bar according to turner is +6.96% stiffer than the stock E9x bar.
H&R 27mm solid FSWB according to turner is +52.44% stiffer than the stock E9x bar.
Eibach 28mm solid FSWB is probably more like 60% or more than the stock E9x bar.
In a sense the m3 bar is sort of a waste of time & money
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