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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > 335is squirley rear suspension



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      10-15-2013, 09:45 AM   #1
bp1
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335is squirley rear suspension

so i just bought a 2011 335is coupe with 77,000km on it, (im coming from a F30 335 xdrive msport which was totaled a little over three weeks ago ) i had h&r sport springs on the car and it felt very composed when i pushed it from time to time.

my experience with a used bmw is new, this is my first one, but id like to keep this car until the summer of 2015 when i plan to get into an F80.

However, in the week or so ive owned the car im not liking how unpredictable the back end can be when i give the car some throttle and introduce it to a corner. im new to the e90/92/93 world and id love some useful advice on suspension recommendations to tighten the car up. i dont intend to track the car, but its not my daily driver either and wont be used much in the winter. all the suspension components on the car are stock for a 335is and were never replaced since the car was first commissioned.
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      10-15-2013, 10:14 AM   #2
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I saw that you were coming from an x-drive. I am wondering if that feeling you are getting could just be oversteer from all that power going to just the rear wheels.
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      10-15-2013, 11:48 AM   #3
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Rear subframe bushings.
Do you still have runflat tires on the car?
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      10-15-2013, 11:43 PM   #4
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Quote:
Originally Posted by reprod View Post
I saw that you were coming from an x-drive. I am wondering if that feeling you are getting could just be oversteer from all that power going to just the rear wheels.
I'm not so sure it's over steering, I've had the DTC left on.. It feels more like a side to side wiggle (although I realize a slight slip in the tires and back to traction would provide that sensation.. I don't think that's what it is)
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      10-15-2013, 11:44 PM   #5
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Quote:
Originally Posted by cvc 22349a View Post
Rear subframe bushings.
Do you still have runflat tires on the car?
Yes they're 19" Pirelli runflats
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      10-16-2013, 12:19 AM   #6
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Quote:
Originally Posted by bp1 View Post
Yes they're 19" Pirelli runflats
Well then you don't want to put in firmer subframe bushings and honestly I wish I hadn't just blurted that out. You probably just need a good alignment.
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      10-16-2013, 12:21 AM   #7
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Quote:
Originally Posted by bp1 View Post
I'm not so sure it's over steering, I've had the DTC left on.. It feels more like a side to side wiggle (although I realize a slight slip in the tires and back to traction would provide that sensation.. I don't think that's what it is)
Side to side wiggle during cornering or under full throttle?
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      10-16-2013, 01:09 AM   #8
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Is the little tc light coming on? If you are kicking in the tc, then your ass end will 'wiggle'.

To turn off tc and find an open space where there is NOTHING TO HIT OR DRIVE INTO and try doing a few small power slides. Welcome to RWD.

Btw, we are talking slower sharp corners, right? Not high speed railers,right?
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      10-16-2013, 06:06 AM   #9
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subframe bushes, decent tires, and LSD will cure this. Sorry to say but our ultimate driving machines are set up for poor handling from the factory. it's really absurd.
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      10-16-2013, 02:31 PM   #10
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Quote:
Originally Posted by ashmostro View Post
subframe bushes, decent tires, and LSD will cure this. Sorry to say but our ultimate driving machines are set up for poor handling from the factory. it's really absurd.
Subframe bushes? You do raise a good point. Our cars really don't have all that great handling characteristics from the factory. It is a BMW but that doesn't mean it will instantly corner on rails or have some form of wiggle. BMW still wanted to make a comfortable car for everyone, not just race car drivers(unfortunately), haha.

As CVC and ashmostro said, the M3 subframe bushings would help a lot because of your mileage... also, rear guide rods help with wheel hop, but that happens under stressful straight line acceleration, not so much in turns. The biggest improvement in corner handling is spring rate and dampening ability. You can go crazy over various setups but just do some research in this section and you will start to get a better idea of what parts to replace in what situations. If you have any questions let us know!

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      10-16-2013, 09:32 PM   #11
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potato potato bushing bush.

the point was conveyed.



Oh and while you are here, did you ever mail my wife back her refund for the ast adjusters she returned?

thanks.
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      10-17-2013, 01:57 PM   #12
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I get the wiggle under WOT on the highway. Seems to be getting worse and kind of dangerous... Hard to keep the car in a straight line. Any suggestions? I have Michelin PSS all around and FBO with a protune.
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      10-17-2013, 06:07 PM   #13
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I agree this is a major deficiency in the 335is. It is ridiculous that BMW did not upgrade the rear subframe bushes and fit an LSD, given the torque is higher than the M3.
I am in a similar situation to the OP - I won't be tracking the car, but want to improve the handling. I am however reluctant to go the full bushings/control arms/LSD route. For starters I have a set of Whiteline bushing inserts on order, in the hope that they will improve matters. Can anyone report on the effect of fitting these, or the Powerflex equivalents?
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      10-17-2013, 07:34 PM   #14
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Quote:
Originally Posted by Timore
I get the wiggle under WOT on the highway. Seems to be getting worse and kind of dangerous... Hard to keep the car in a straight line. Any suggestions? I have Michelin PSS all around and FBO with a protune.
Firmer subframe bushings: M3, powerflex or solid, powerflex differential bushings or the defi lockdown kit, Megan racing toe arms and guide rods.
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      10-20-2013, 10:53 AM   #15
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I'm wondering if widening the rear track by adding spacers may help?
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      10-20-2013, 10:58 AM   #16
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Quote:
Originally Posted by bp1 View Post
I'm wondering if widening the rear track by adding spacers may help?
Wouldn't that make things worse, by adding more leverage on the soft subframe bushes?
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      10-20-2013, 02:33 PM   #17
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It *could* make things worse, but it definitely wouldn't make it any better...
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      10-20-2013, 10:13 PM   #18
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Quote:
Originally Posted by Timore View Post
I get the wiggle under WOT on the highway. Seems to be getting worse and kind of dangerous... Hard to keep the car in a straight line. Any suggestions? I have Michelin PSS all around and FBO with a protune.
The ground control toe arms helped a lot with that. Already had subframe bushing before that. These really did help stabilize the rear a decent amount.

http://www.ground-control-store.com/.../II=908/CA=165
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