Suspension Guru's - Need help on Sway Bar/Endlink Preload Question...
I just got back from my shop that installed a set of springs on my brand new Bmw. Everything was installed while the car was on a lift...
Car looks great and seems to handle much tighter than before but i am noticing a slight rattle/clunk coming from the front of the car after the install. Doesn't make any noises while the car is stationary and turning the wheel left to right. It only makes the noise if i hit a sharp bump going over potholes. On larger bumps that is more gradual the car doesn't make any noise even with more suspension compression. Only on sharp bumps. Sounds like something is loose up front.
I am suspecting it has to do with the swaybar/endlink preload causing the clunks but I am getting conflicting information on the web about this. I've read where it is not possible to preload or zero out load using the OEM endlinks but i've also read where people eliminated suspension noise by doing so using oem endlinks.
Then i am also getting a mix bag where most will tell you you want zero preload on your sway bars by tightening everything while the car is on ramps (my springs were installed on a lift) but have also seen cases where zero preload can cause clunks since there is no tension on the sway bar at all unless you are turning. I've seen this happen on my 335 where i installed a set of adjustable endlinks up front and at zero preload (car was on ramps) if i just banged on the sway bar with my hand you get a nasty resonating vibration/sound. Once i added a little preload by adjusting the endlink if i banged on the sway bar again it felt completely solid.
If anyone has any ideas about this please let me know. I plan on rechecking everything under my car this weekend while it is on ramps and I want to make sure i do it right first time around instead of chasing this for who know how long. I can't stand a car that clunks let alone a brand new car!
Check the top bolts, (the ones that actually hold the strut/spring together not the ones that attach to the car) on the front struts under the hood. When I did my suspension I only tightened them with a ratchet and i had what sounds to be the same "clunk" that you are experiencing, once I hit them with the impact gun while still on the car the clunk was gone and it actually lowered the front end a little bit more.
I have the same problem... But mine comes from one of my rear tires
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