Posted 03 January 2021 - 03:25 PM
Posted 03 January 2021 - 04:57 PM
Now that is a very good question. Those 4 bushes are all about noise and vibration isolation . How much movement they introduce into the rear suspension geometry and the subsequent impact of such movement is hard to know. For a track day toy, the rear suspension does not want to move independently from the rest of the chassis , so fixing the subframe is a must. Hence products like the frames made by Verkline which replace those buses with solid mounts along with the rest of the subframe . Some people go for a half way house and get a Tyrolsport deadset( for both front and rear) which stops the subframes from shuffling on their mounting points whilst retaining the bush compliance .
I think that for a road car, the suspension bushes are your best place to begin, replacing with Superpro or the equivalent and then decide if the rear of the car still feels too wayward for your liking , unless of course you are already at that point, and hence the above question.