1990 525i e34 vibration / shaking at around 80km/h (50mph)
Hi there everyone,
First of all, I'd just like to say i'm a newbie to this forum and to the BMW community, so go easy on me please!
And before you ask, yes I have checked previous posts regarding "shakes and shimmeys"...
Recently I just purchased a new set of wheels/rims (225/60R15) off a new 5 series (e39 i think?). I had them put on my 1990 525i e34 WITH hubcentric rings to account for the e46/e34 diameter difference.
I also had a wheel balance and alignment done.
While driving it on the highway I find the steering wheel and generally the body of the car shakes VERY BADLY at around 80km/h (50mph). At first i just accelerated and hit 100km (65mph) and it wasn't that bad....but later after braking a few times...I just couldn't get past 80km/h again. It literally felt like the wheels would fly off.
Strangely enough, when i drive any speed under 70km/h (around 40mph) the car drives smooth as silk.
Now for a bit of history, I bought the 525i (with 100K miles - 169K kilometres) about 2 weeks ago with stock wheels (205/60R15), the tyres were unevenly worn (hence the alignment) and thread low. Even with these tyres I could do around 65mph with a little vibration in the steering column. THis new shake / vibration is terrible.
Because of this I doubt it is the suspension ( a friend of mine who knows BMWs and has driven my car says the suspension is fine), driveshaft, brake pads and rotors (checked by a mechanic not too long ago), or upper thrust arms...all commonly attributed to shaking on highway conditions. I also doubt it is the guibo...
So right now I am completely stuck.
I have a brand new set of wheels all fitted to go, but I can't figure out this shaking problem.
Can anyone help me with this problem at all? Any feedback is appreciated.