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      02-05-2012, 01:58 AM   #1
michaelalex17
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best rear sway bar for 335xi?

sorry if this has been covered before but i cannot find it. i was curious what the best rear sway bar for the e92 335xi is. i have seen


-M3 rear sway bar-20mm
-H&R rear sway bar-20mm
-UUC rear sway bar-19mm

thanks guys
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      02-05-2012, 09:56 AM   #2
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Dude, your question was already answered - get the M3 bar. No need to start multiple threads on the same topic, especially when there are already plenty of resources on here.
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      02-13-2012, 11:34 AM   #3
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i searched this and was wondering the same thing. any reason why the m3 is better then the H&R?
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      02-13-2012, 05:43 PM   #4
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Omg. Not again.
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      02-13-2012, 06:05 PM   #5
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I have the UUC F+R and found them so much better then stock
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      02-14-2012, 01:40 PM   #6
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Quote:
Originally Posted by froz_v View Post
I have the UUC F+R and found them so much better then stock
thanks
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      02-14-2012, 08:57 PM   #7
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Quote:
Originally Posted by michaelalex17 View Post
sorry if this has been covered before but i cannot find it. i was curious what the best rear sway bar for the e92 335xi is. i have seen


-M3 rear sway bar-20mm
-H&R rear sway bar-20mm
-UUC rear sway bar-19mm

thanks guys
We like the M3 bar. OEM fit, no noise and no need to lube the bushing every 6 months or a year.
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      02-15-2012, 08:33 AM   #8
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Quote:
Originally Posted by HP Autowerks View Post
We like the M3 bar. OEM fit, no noise and no need to lube the bushing every 6 months or a year.
OEM?
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      02-15-2012, 11:38 AM   #9
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Quote:
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OEM?
Original Equipment Manufacture, in othe words M3 bars.
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      02-15-2012, 12:03 PM   #10
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I agree genuine BMW M3 bars are the way to go. Not only do they provided a very noticeable "tightening" but they are also very cost effective.

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      02-15-2012, 01:16 PM   #11
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Quote:
Originally Posted by HP Autowerks View Post
Original Equipment Manufacture, in othe words M3 bars.
Yeah, I just meant to ask: Oem fits?
Sorry for not clarifying.
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      02-15-2012, 01:17 PM   #12
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Quote:
Originally Posted by mashimarho View Post
Yeah, I just meant to ask: Oem fits?
Sorry for not clarifying.
The rear bar from the M3 does fit the 335Xi.
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Last edited by ECSTuning; 07-02-2013 at 08:55 AM.
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      02-15-2012, 01:33 PM   #13
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Quote:
Originally Posted by ECSTuning View Post
The bars from the M3 do fit the 335Xi.
Okay, thought so.
Thank you!
Any recommendations? 2012 e92 335xi LCI 6mt.
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      02-15-2012, 02:44 PM   #14
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mashimarho- I'm going to have my parts guys do a little more checking to make sure the M3 bars are 100% compatible with the N55 powered Xi.

Typically I'm a fan of starting by beefing up the rear sway bar 1st, the Xi (and other cars) come with understeer dialed into the suspension from the factory, where understeer is considered to be "safer" I prefer the excitement of oversteer. Going with a stiffer rear bar than front will cause the rear to become tighter and the car to be less prone to understeer.
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Last edited by ECSTuning; 02-15-2012 at 03:46 PM.
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      02-15-2012, 02:52 PM   #15
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Quote:
Originally Posted by mashimarho View Post
Yeah, I just meant to ask: Oem fits?
Sorry for not clarifying.
Yes, all the E8x and E9x model rear bars interchange. We have done all the required R&D back in 2008 to confirm this. Other tuners just take our ideas, but can't really verify fitment.

Something to be aware when adding a rear bar to the late model non M chassis is that it does reduce rear traction in a turn under power unless a good LSD is added. The result is more rear inside wheel spin.
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      02-15-2012, 03:26 PM   #16
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Quote:
Originally Posted by ECSTuning View Post
I just noticed the year of your car, I'm going to have my parts guys do a little more checking to make sure the M3 bars are 100% compatible with the N55 powered Xi.

Typically I'm a fan of starting by beefing up the rear sway bar 1st, the Xi (and other cars) come with understeer dialed into the suspension from the factory, where understeer is considered to be "safer" I prefer the excitement of oversteer. Going with a stiffer rear bar than front will cause the rear to become tighter and the car to be less prone to understeer.
thank you for all your help. i have the n54 on my car. on your site you have two different options. stage 1 and 2. which one do i get? thanks
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      02-15-2012, 03:46 PM   #17
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michaelalex17 - I'll shoot you a PM
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      02-22-2012, 07:25 PM   #18
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the m3 e93 rear bar is 23.6 is that better then getting the 20mm from the e92? or once it gets to big it makes things worse or something? will the e93 one fit on an e92?

OEM BMW E9X M3 Rear Sway Bar Kit. E9x M3 Kit includes rear 20mm swaybar, bushings, and brackets. E93 M3 Convertible Kit includes 23.6mm rear swaybar, bushings, and brackets. **Use of this kit on non E9x M3's is at your own risk.
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      02-22-2012, 07:47 PM   #19
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Quote:
Originally Posted by michaelalex17 View Post
the m3 e93 rear bar is 23.6 is that better then getting the 20mm from the e92? or once it gets to big it makes things worse or something? will the e93 one fit on an e92?

OEM BMW E9X M3 Rear Sway Bar Kit. E9x M3 Kit includes rear 20mm swaybar, bushings, and brackets. E93 M3 Convertible Kit includes 23.6mm rear swaybar, bushings, and brackets. **Use of this kit on non E9x M3's is at your own risk.
Larger isn't always better. All suspension components must work together. Larger rear bar will reduce rear traction in a turn so be careful.

E90/92/93 rear bars interchange between all models.
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      02-22-2012, 07:49 PM   #20
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Larger isn't always better. All suspension components must work together. Larger rear bar will reduce rear traction in a turn so be careful.

E90/92/93 rear bars interchange between all models.
i figured once i made it to big it would start having negative effects. i want the rear sway bar because i want to make the car have more oversteer and make it drive more like a rear wheel drive car. i just dont want to make the car to start to have negative handling characteristics if i make it to big.
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      02-22-2012, 07:51 PM   #21
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does anyone with an e92 335xi have an m3 e93 rear bar?
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      02-22-2012, 07:57 PM   #22
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Quote:
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mashimarho- I'm going to have my parts guys do a little more checking to make sure the M3 bars are 100% compatible with the N55 powered Xi.

Typically I'm a fan of starting by beefing up the rear sway bar 1st, the Xi (and other cars) come with understeer dialed into the suspension from the factory, where understeer is considered to be "safer" I prefer the excitement of oversteer. Going with a stiffer rear bar than front will cause the rear to become tighter and the car to be less prone to understeer.
This seems to contradict what I have come to understand with regard to the e9x suspension. And when one runs a staggered wheel/tire set-up the car's natural tendancy to understeer becomes exhasterbated in which case a slightly stiffer front sway would be in order.

I think The Hack describes it best....

"I'm going to let you in on a little secret. "Understeer" as a term is too often used to describe the wrong things. I'm going to let you in on another secret. Suspension tuning is all about a series of compromises, and each compromise will have different effect on how the suspension will actually behave depending on what other components are "upgraded." The last secret I'm going to let you in on, is that 99.9% of the people posting on these forums will never take the car to the track where they experience actual understeer to actually be able to give you any sort of objective answer as to what mod actually affect the balance of the car, and likely will not know understeer even if it bit them in the ass.

Now that I got the pleasantries out of the way. The reason why BMW front suspension typically employs a thicker front anti-roll bar is because of the MacPherson strut design. Unlike double wishbone type suspension, the MacPherson strut has an unfavorable camber curve, in that the camber does not increase linearly as the suspension is compressed. So as the car takes a corner and sets, the outside suspension is going to compress past the roll center and will go from a favorable increase in negative camber to start to lose the negative camber. When that happens the front end will lose grip rapidly. One of the solutions to alleviate this problem, is to deploy thicker front anti-roll bars to prevent the outside suspension component from compressing PAST the roll center and start to lose camber. It's a way to artificially increase spring rate to one side of the suspension without giving up straight line ride comfort. You'll find that most balanced chassis with double a-arm or double wishbone suspension front and rear will likely have very similar anti-roll bars front and back. A great example is the 1991 Acura NSX, the front and the rear anti-roll bars are within a MM in diameter and the NSX-S (JDM versions) actually has thicker rear anti-roll bars. In 1993 they increased the front swaybars to remove grip up front and promote "understeer" since the early NSXes were deemed too tail happy (i.e. NEUTRAL) for 99.95% of your average drivers.

But the entire system needs to be taken into consideration, since the amount of spring compression on the outside is going to depend on a lot of different factors. Meaning going toO thick on the swaybar will result in the front end not compressing enough, therefore not getting enough grip when entering corners, resulting in corner entry understeer. However said thicker swaybar may actually REDUCE corner exit understeer since it will retain a higher spring rate up front and potentially keep the front tires on the ground longer when accelerating out of a corner.

All of this, is assuming you're already taking the ideal line through a specific turn. If you're EARLY into a turn, or carrying too much speed into the turn, you are going to UNDERSTEER regardless. Most of the so-called journalists who mention "understeer" as a problem on these cars are usually talking about corner exit understeer, whereby when you apply too much throttle the car will tend to push at the exit of a turn rather than have the rear end break loose.

Now, if you want to talk about how to actually fix understeer in this particular instance, I've pointed out multiple times that the best way to actually fix it is by fixing the driver first. But in case you don't actually plan to do this part (fixing the driver), there are things on this particular chassis that you can do that may actually alleviate corner exit understeer. One of the biggest problem it has, believe it or not, is the fact that it lacks a mechanical limited slip differential. On a car with LSD, upon corner exit understeer when it doesn't respond to MOAR throttle, an LSD will actually attempt to send power to the outside wheel rather than inside wheel to attempt to correct it, and eventually too much power WILL overwhelm both rear wheels and switch it from understeer to oversteer. So if adding grip via driver/tire/camber/whatever is not an option, adding an LSD will go a very long way. But a simulated LSD via braking the wheel that is slipping will not."

Last edited by cssnms; 02-22-2012 at 08:28 PM.
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