On a road car, the difference in suspension movement between a polybush and an unworn standard bush is virtually unoticable. Anyone who claims otherwise is probably comparing polybushes with worn OEM units, as polybushes usually replace old OEM ones.
What most modders don't appreciate is that to work properly, polybushes have to be kept lubricated, especially the steel sleeve. If not kept lubricated they will start to squeak and the sleeve will wear, resulting in more suspension play than they had before!
If this is rubbush, then please put me straight
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I used poly bushes on my 306, i changed all of the suspension....and i do litterally mean all of it at the same time, the reason for changing go poly bushes for me at the time was that the oem bushes are crap on 306's they wear quickly and when you increase the torque of the engine the tend to disintigrate quite quickly so the done thing is to upgrade, Lynx make some roller baring bushes for the 306 which do have to be greased preiodicly but they have grease nipples on them so easy to service,
I didnt know that poly bushes required prieodic lubrication though....
On the 205 i wont be bothering with them though because digging out the rubber bushes from the arm (they are pressed in from the factory) and they are way more hasstle than its worth... ill just save up for some rose jointed adjustable arms...