So I recently purchased a rear Innovative Mount (I think the 60A) from BOE, mainly to fix some slop I noticed with throttle applications, with a lot of drive-line shunt thrown into the mix. Having had stiffer engine mounts on a previous car I am aware of the expected increase of transmitted vibration and associated rattles - the technicians of the company I work for seemed to be miffed when they installed the mount as to why I would submit myself to such torture. Perhaps they weren't exaggerating too much.
It's not so bad - I've seemed to localise the rattles to 3 main areas:
- Driver's side hard top attachment bolt cover (most of the bolts are threaded from a previous incident when the car was still a company demonstrator, so the cover cannot actually be tightened)
- Driver's side seatbelt anchor point
- Entire rear speaker panel and associated parts (like the seat belt anchor brace in particular)
There is also I think a minor vibration from the dashboard, above the A/C controls.
There's a natural resonance frequency of around 2500-3000rpm where these components really generate a high amplitude vibration, above which the rattles disappear. What have people used as methods to cure these? I guess I could use Dynamat/padding in some areas but are there other specifics? As I saw on Sand's Museum page, indeed the rear air vent did vibrate, which just turning it in a slightly different direction did fix, before reading of it.
Cannot fault the mount otherwise if people may be getting intimidated by this, great throttle response now, and the vibration has subdued a bit as the mount got some miles on it.