Suspension & Brakes Theory, alignment, spring rates....

Uneven drop? Why? i checked everything..PLS HELP

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Old Feb 15, 2006 | 07:29 PM
  #1  
smkngsr's Avatar
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Default Uneven drop? Why? i checked everything..PLS HELP

I just dropped my 05 S with 2k on them. I just dropped them today with Bilstein PSS coilover and for some reason, after all the adjustment and measurement that i did, the car is not even. In fact, the rear is perfect, but the fronts are not. The passenger front is actually higher even when i both measure them at the same height...Can someone explain that and pls give me feedback on what to do or something i can check. thanks much guys
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Old Feb 16, 2006 | 09:20 AM
  #2  
Tyson's Avatar
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From: I am Tyson
Default Re: Uneven drop? Why? i checked everything..PLS HELP (smkngsr)

its normal. cars weight is not even. it probably was not even when the car was at full ride height, you just didnt notice it. now that the gap is reduced, the difference is more noticable. lots of ppl come here complaining about it, its just normal.

however, if you didnt bother to zero out the bushings you should do that, it might help settle things as well. you should do this regardless of differenceo f ride height, its part of the factory workshop manual.

the stock rubber bushings are made of a inner metal sleeve and an outer metal sleeve. there is rubber filled between the two and bonded to the surface of both sleeves. the inner sleeve can only rotate so much relative to the outer sleeve because the rubber only allows so much stretch. it also stretches elastically, like a spring. bushings actually contribute to the spring rate of your suspension. when you tighten the bolt to the bushing, it locks the relative position of the inner sleeve to the outer sleeve, plus the range of motion and spring force the bushing allows.

if you do not reset your bushings, then the bushing is forced to be in a stretched position most of the time at an outer range of the intended motion, instead of resting at the middle, unstretched position. and once you over stretch the bushing, it loses its capacity to stretch and breaks the rubber like a rubber band. which is how you easily kill a bushing. gone is the spring rate of the bushing and will likely deteriorate faster and cause slop in positioning the inner sleeve concentric to the outer sleeve.

to reset your bushings, put the car on 4 jackstands. take the wheels off. loosen the suspension bolts. put a jack under one of the suspension corners and raise it until that corner is off the jack stand. bounce the car a bit. then tighten. dont forget to tighten a bolt youve already loosened.
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