mardi 27 janvier 2015

325xi (E91 wagon) hitting the suspension (rubber) stopper going over freeway joints

After a long search for a manual 3 series sport wagon, I found (and bought) a 2006 325xi (all wheel drive) with just about 100k miles after it cleared the pre-sale inspection a couple of months ago. I have since gone on a couple of road trips with the car but on several occasions, when driving over freeway joints (say, going over a bridge, etc.) at normal speed (~70MPH) the car "bottoms" and the body seemingly hits the rubber bumpers that limit the strut/shock travel. The car has a standard (not Sport) suspension and everything is stock (i.e. it is not lowered.) Other than this the car handles ok and the ride appears normal (even though a bit too soft to my taste.)



This has never happened on my Z3, or my previous E46, driving over similar or more severe bumps, so I am wondering:



- Is this an indication that the front struts or rear shocks are worn out and need to be replaced ? The "bounce" test does not seem to show anything since the car (spring) does not yield measurably no matter how hard you push down on the front of rear bumpers ?



- Do run-flat tires increase the chances of "bottoming" when going over sharp bumps ?



- If the struts on the car need to be replaced, any suggestion for what to replace them with for a slightly stiffer ride but without losing any ground clearance (I occasionally need to drive on rough roads to reach trailheads and need all the clearance that I can get !) Also, are the shocks/struts from the xi (all wheel drive) E90 interchangeable with those of the non-xi models as well as sport/non-sport suspensions ?



- Finally, someone is advertizing a full set of shocks+struts from an 2007 E92 (Coupe with sport suspension, removed from a car with ~60k miles) on the local CL. Would it be worth looking into them as replacement parts or 60K is considered high for OEM parts ?



And, on a side note, the car's headlight high (bright) beam seems to be pointing rather low (certainly compared to all my previous cars).

Is there a possible link between the two, or is it simply a matter of a headlight in need of a routine adjustment?



Would appreciate any insights or suggestions from those who have dealt with similar issues..



Would appreciate any advice




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