On the ZRoadster forum someone made a detailed post about fitting the ACS suspension kit on their Z3M Roadster. The kit comes with 4 springs, 4 shocks and 2 aluminium donut-shaped spacers which look around 10mm or so thick.
The spacer is fitted ABOVE the subframe where it bolts to the body and required a bit of work to fit as the subframe needs to be dropped from the body so the spacers can be fitted on the subframe studs.
You can see the gap these spacers are "packing" out if you undo the lower 3 screws holding the rear arch liner on; peel it back and you can see how the subframe is bolted up to the car and the stud coming out of the body; at the top and bottom of the subframe bush there are 4 or 5 "buffers" intended to smooth out excessive movement.
The gap at the bottom between the bush and side plates is quite small, but the gap at the top between the bush and the body is quite large so it would require quite extreme subframe movement to hit the buffers (but as the buffers are there at the top it would indicate this is within the designed range of the bush). With the ACS spacers fitted this gap must be reduced to someting similar to that of the bottom.
Does anyone who has got the ACS suspension fitted know if these spacers/packers are fitted to their car?
As an experiment I've packed out the top of mine with some rubber with no noticeable increase in NVH. I've only done a quick test drive but it did seem to shift smoother and have less rear steer under acceleration as the subframe isn't twisting.
The spacer is fitted ABOVE the subframe where it bolts to the body and required a bit of work to fit as the subframe needs to be dropped from the body so the spacers can be fitted on the subframe studs.
You can see the gap these spacers are "packing" out if you undo the lower 3 screws holding the rear arch liner on; peel it back and you can see how the subframe is bolted up to the car and the stud coming out of the body; at the top and bottom of the subframe bush there are 4 or 5 "buffers" intended to smooth out excessive movement.
The gap at the bottom between the bush and side plates is quite small, but the gap at the top between the bush and the body is quite large so it would require quite extreme subframe movement to hit the buffers (but as the buffers are there at the top it would indicate this is within the designed range of the bush). With the ACS spacers fitted this gap must be reduced to someting similar to that of the bottom.
Does anyone who has got the ACS suspension fitted know if these spacers/packers are fitted to their car?
As an experiment I've packed out the top of mine with some rubber with no noticeable increase in NVH. I've only done a quick test drive but it did seem to shift smoother and have less rear steer under acceleration as the subframe isn't twisting.
Comment