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Vibration from rear under heavy load

edh

edh

New member
Under hard acceleration, 3rd/4th/5th gear - WOT on track or m/way, i get a vibration that's coming from the rear. It's not always there, but has become more noticeable over the last 6 months.

This seems to be a problem that is common to 944's - a couple of friends have also had this, but have ignored it as it's been minor & intermittent.

I've had a look at the suspension & all looks OK as far as I can see - I'm guessing it's a bush somewhere - either gearbox mount or torsion bar tube maybe? The rear suspension is slightly modified - Leda dampers, 968 M030 arb, re-indexed t-bar (don't know the rate).

Anyone else had this (and fixed it) ?
 
I've had it (more like a rumble almost?) in at least one of my cars. I honestly can't remember which one and I didn't try to fix it deliberately. As I recall the Turbo didn't do it when it was running last, so either it never did or it was fixed by fitting one of the replaced items; rear arm bushes, rear shocks, rear beam mounts, rear ARB bushes. I didn't replace the gearbox mount.
 
narows it down a bit ;)

it's likely to be the most awkward/expensive of the options i guess :)
 
If it was just mine - maybe, but this has also happened on two other 944 250 turbos - it doesn't feel like a wheel related vibration - doesn't seem stronger at certain speeds
 
There's not much noise, just vibration - feels like the rears wheels are driving over bumpy tarmac & hopping about a bit

It's not speed related, more torque related I think - accelerating hard out of a third gear bend on track for example
 
Is it more on bends or acceleration out of a bend?

Or at over 70mph?

Mine does the same and the reason is it needs rear wheel bearings replacing. Over 70 it appears the spoiler works and i'm guessing increases load. On a bend obviously there is increased load.

I've got the origional wheels on my '83 luxe so nice fat tyres to absorb some of it.

Wheel bearings will be fitted as soon as the weather man suggests i have a day of half decent weather.
 
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