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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-17-2010, 02:13 AM
conrad721 conrad721 is offline
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a generic query re cars with auto transmission

what makes the car "sit" after engaging it from N to D?
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  #2  
Old 10-17-2010, 06:47 AM
mr_bean mr_bean is offline
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Mein Auto: 2000 328i
It's a little difficult to describe without illustrations. But, with the car in drive and the brakes applied, there is torque applied to the drive train. In particular, the torque in the half shafts must counter-acted by some structural member between the differential and the wheels. This is where the suspension comes into play. Essentially, the forces cause the trailing arms to pivot, causing the back end of the car to "sit".
With the car in reverse, the opposite effect can be see. The back end will "stand"
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Old 10-17-2010, 08:24 AM
vfr700f2 vfr700f2 is offline
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Mein Auto: '02 330CiC, '97 528i
Technically this is called "squat" and good suspensions are designed with a desired percentage of "anti-squat". Of course, manual trans cars squat too, but only as you accelerate. Drive an old Datsun Z to feel lots of squat...
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Old 10-17-2010, 01:12 PM
conrad721 conrad721 is offline
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what about if something is broken?

like what i experienced one fine morning after when i was about to go to work, i started the car and then shifted to D.
the rear of the car literally "sprung" up together with a loud "thud".
it really raised the rear passenger side of the car like it was a 4x4.
the car wouldnt budge without a loud "thud" like breaking a piece of metal sound.

i placed it in R and bang! it went back down.
later on i read here that my parking brake may have locked up.

but...

the rear of the car has not dropped back the way it was.
it is now about 1/2 an inch higher than it was before.
that is why i was asking this question.

i might have broken something.
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Old 10-17-2010, 01:39 PM
jcourcoul jcourcoul is offline
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Mein Auto: 2006 325Ci
Well, guess it is time to crawl under the thing and check out every link, bar, bushing and spring.

Not to mention the subframe like the awful mess that Smock's car turned into before the massive (BMW subsidized) repair.
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  #6  
Old 10-17-2010, 07:37 PM
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catso catso is offline
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Mein Auto: 2000 323i, 1988 528e
You might have rear subframe mount damage.
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