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      05-19-2017, 08:06 PM   #1
singhr
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Question Need advise for rear shocks - fronts replaced by dealer

I did some reading/searching on the forums but couldn't get a clear answer and could use some help from the experienced folks here.

2011 328i - non-sport suspension, 54k miles. Dealer replaced front struts under warranty with stock OEM since they said they were shot when inspected. It is my DD with mostly city driving - quite mild for the most part.

I am planning to do the rear ones myself and would like advise on what I should put on there to match up with the new stock front struts. The rear now looks a bit low since the fronts were replaced, so I am guessing they are shot as well.

1. Stock BMW or Bilstein B4 OEM shocks
2. Bilstein B6 or HD shocks
3. Or others?

I don't want to replace the rears with something that will mess up the ride with the stock front struts, but am willing to put something other than stock if it will help with longevity or ride quality or handling.

Also, should I replace any other parts (like solid rubber Monroe bushings) or lower mounts? I am in northern CA and the car hasn't seen much of extreme weather or poor road conditions. Thanks!
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      05-20-2017, 08:12 AM   #2
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I think you've pretty much answered your own question - get a pair of stockers.

Do you still have warranty?
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      05-21-2017, 09:19 AM   #3
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As long as your replacing the shocks go ahead and replace the rubber mounts too. Both upper and lower. At 82K ours especially the top rear shock mount was bad.
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      05-21-2017, 10:58 AM   #4
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If you have OEM on the front, I'd go with Bilstein B4's on the rear. Better shock than OEM.

I'd never go above and beyond the B4 for a 328. If you have a 335 than, that's a different animal and thus requires more advanced parts.

If the car just had 54k on it, just replace the shocks. Don't worry about surrounding parts till the car has 100k
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      05-21-2017, 11:05 AM   #5
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Smear some oil around rear shocks, take it back to dealer & tell them you've been told your rear shocks may need replacing & let the dealer do the rears under your warranty

I did this on my old e39 540i & had all four shocks replaced for free
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      05-21-2017, 02:38 PM   #6
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Thanks all. Will stick to stock oem for rears.

I'll try to get the rears replaced under warranty as well. Dealer experience wasn't the best with the fronts. They wanted me to pay so had to show them fine print coverage under BMW platinum warranty. Broke my front brake sensor and did not install the clip that holds it. Took 5 days total waiting for parts and weekend in between. No loaner either- they were all out

Or just do it myself with b4/Sachs stock shocks. Seems like a pretty straightforward install. I'll also replace the mounts if there are signs of wear.
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      05-22-2017, 04:25 AM   #7
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Quote:
Originally Posted by Chappers 71 View Post
Smear some oil around rear shocks, take it back to dealer & tell them you've been told your rear shocks may need replacing & let the dealer do the rears under your warranty

I did this on my old e39 540i & had all four shocks replaced for free
hahah good one! Haven't heard than one in a while lol
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      05-22-2017, 09:46 AM   #8
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Quote:
Originally Posted by mweisdorfer View Post
I'd never go above and beyond the B4 for a 328. If you have a 335 than, that's a different animal and thus requires more advanced parts.
Unfortunately to the rest of us, this advice makes absolutley no sense.
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      05-22-2017, 11:36 PM   #9
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Quote:
Originally Posted by mweisdorfer View Post
If you have OEM on the front, I'd go with Bilstein B4's on the rear. Better shock than OEM.

I'd never go above and beyond the B4 for a 328. If you have a 335 than, that's a different animal and thus requires more advanced parts.

If the car just had 54k on it, just replace the shocks. Don't worry about surrounding parts till the car has 100k
I agree on the B4, but was does cornering prowess and ride have to do with power?
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      05-23-2017, 01:39 PM   #10
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Ok looking at B4 rear shocks I keep getting TWO different part numbers from various websites - bavauto, fcpeuro, summit and bilstein(US):

19-135021
OR
19-136592

I could not find the detailed specs on either shock.
Which is the correct one? 2011 328i e90 sedan build date: 04/2010

Thanks!
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      05-23-2017, 04:17 PM   #11
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Quote:
Originally Posted by tlow98 View Post
Quote:
Originally Posted by mweisdorfer View Post
If you have OEM on the front, I'd go with Bilstein B4's on the rear. Better shock than OEM.

I'd never go above and beyond the B4 for a 328. If you have a 335 than, that's a different animal and thus requires more advanced parts.

If the car just had 54k on it, just replace the shocks. Don't worry about surrounding parts till the car has 100k
I agree on the B4, but was does cornering prowess and ride have to do with power?
Um, the more power you have the better suspension you will need to match the power, or the car will have a hard time staying on the road when you push it hard.
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      05-23-2017, 11:49 PM   #12
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Quote:
Originally Posted by mweisdorfer View Post
Um, the more power you have the better suspension you will need to match the power, or the car will have a hard time staying on the road when you push it hard.
Interesting...
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      05-24-2017, 12:40 AM   #13
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Quote:
Originally Posted by mweisdorfer View Post
Um, the more power you have the better suspension you will need to match the power, or the car will have a hard time staying on the road when you push it hard.
So, an equal suspension 335i will be faster in a corner than a 328i?
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      05-24-2017, 09:46 PM   #14
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Quote:
Originally Posted by tlow98 View Post
Quote:
Originally Posted by mweisdorfer View Post
Um, the more power you have the better suspension you will need to match the power, or the car will have a hard time staying on the road when you push it hard.
So, an equal suspension 335i will be faster in a corner than a 328i?
I assume you are saying that if a 328i and a 335i had the exact same suspension which car would be faster in and out of a corner?

I am not sure where you are going with this.

My original point was that putting a b12 kit on a 328, for example, would be a waste money & time.
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      05-24-2017, 11:48 PM   #15
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Quote:
Originally Posted by mweisdorfer View Post
I assume you are saying that if a 328i and a 335i had the exact same suspension which car would be faster in and out of a corner?

I am not sure where you are going with this.

My original point was that putting a b12 kit on a 328, for example, would be a waste money & time.
Finally someone who knows what they're talking about. So tire of the noob fodder cluttering the forums.

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      05-28-2017, 05:31 PM   #16
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Quote:
Originally Posted by mweisdorfer View Post
I assume you are saying that if a 328i and a 335i had the exact same suspension which car would be faster in and out of a corner?

I am not sure where you are going with this.

My original point was that putting a b12 kit on a 328, for example, would be a waste money & time.
So, the 328i owner would not enjoy the increased performance?
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      05-28-2017, 06:02 PM   #17
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Quote:
Originally Posted by tlow98 View Post
Quote:
Originally Posted by mweisdorfer View Post
I assume you are saying that if a 328i and a 335i had the exact same suspension which car would be faster in and out of a corner?

I am not sure where you are going with this.

My original point was that putting a b12 kit on a 328, for example, would be a waste money & time.
So, the 328i owner would not enjoy the increased performance?
Ok.... let's me put it this way. A 328 owner can't push the car hard enough to ever experience or get the full performance capabilities out of a B8 shock & strut. Period...

That's why a B4 sport is a better option for a car that has 230 hp and can't break 6 seconds 0 to 60 from the factory.
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      05-28-2017, 06:45 PM   #18
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Quote:
Originally Posted by mweisdorfer View Post
Ok.... let's me put it this way. A 328 owner can't push the car hard enough to ever experience or get the full performance capabilities out of a B8 shock & strut. Period...

That's why a B4 sport is a better option for a car that has 230 hp and can't break 6 seconds 0 to 60 from the factory.
So, the acceleration and power capabilities of a car are what dictate how much travel the suspension uses?

Or, are you saying that it's the owners of the cars that physically cannot push the car?

Is a 0-60 of six seconds a universal factor for determining how much suspension a car can use?

What about the 255hp 330i - how much more would you say it could use of its suspension? Enough to qualify for an acceleration demanding, but rather generic Bilstein B6? Maybe even the B8?

These new theories you bring to the table really deserve an explanation.

EDIT: Wait, I think i might get it now. Upon putting the skinny pedal to the floor in a 335i, those owners will experience something in less than 6 seconds that will really put the suspension under extreme duress? That movement of the weight moving to the rear compresses the suspension down so much that a B6 or B8 suspension will truly be appropriate.
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      05-28-2017, 06:47 PM   #19
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Quote:
Originally Posted by tlow98 View Post
Quote:
Originally Posted by mweisdorfer View Post
Ok.... let's me put it this way. A 328 owner can't push the car hard enough to ever experience or get the full performance capabilities out of a B8 shock & strut. Period...

That's why a B4 sport is a better option for a car that has 230 hp and can't break 6 seconds 0 to 60 from the factory.
So, the acceleration and power capabilities of a car are what dictate how much travel the suspension uses?

Or, are you saying that it's the owners of the cars that physically cannot do push the car?

Is a 0-60 of six seconds a universal factor for determining how much suspension a car can use?

What about the 255hp 330i - how much more would you say it could use of its suspension? Enough to qualify for an acceleration demanding, but rather generic Bilstein B6? Maybe even the B8?

These new theories you bring to the table really deserve an explanation.
No they don't. Its just common sense..
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      05-28-2017, 07:24 PM   #20
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Quote:
Originally Posted by tlow98 View Post
So, the acceleration and power capabilities of a car are what dictate how much travel the suspension uses?

Or, are you saying that it's the owners of the cars that physically cannot push the car?

Is a 0-60 of six seconds a universal factor for determining how much suspension a car can use?

What about the 255hp 330i - how much more would you say it could use of its suspension? Enough to qualify for an acceleration demanding, but rather generic Bilstein B6? Maybe even the B8?

These new theories you bring to the table really deserve an explanation.

EDIT: Wait, I think i might get it now. Upon putting the skinny pedal to the floor in a 335i, those owners will experience something in less than 6 seconds that will really put the suspension under extreme duress? That movement of the weight moving to the rear compresses the suspension down so much that a B6 or B8 suspension will truly be appropriate.
Dude it's simple physics.

F = MA

(acceleration for the non-experts here)

335i "a" is about a factor of 7 units
328i "a" is about a factor of 2.5 units

M is about the same for both... hence 335i requires suspension that can handle more force if you will, e.g. the bilstein B6/8. 328i can get away with less sporty hardware.

Those values are rounded so don't hold my math against me...


Quote:
Originally Posted by mweisdorfer View Post
No they don't. Its just common sense..
Agreed

Btw what suspension do you have? How do you like it and how's it handle when you push your car to limits? Always looking for ways to improve my times...
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      05-28-2017, 11:17 PM   #21
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Thanks all. Will stick to stock oem for rears.
Smh...anything else but that.
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      07-07-2017, 12:13 AM   #22
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If you plan to leave stock springs and stock front struts then HD's are overkill. Just use OEM or Bilstein B4.
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