phazed Posted December 9, 2023 Report Share Posted December 9, 2023 Technical question. I am currently preparing my Boxster 986S for track day use. Not going mad as we all know, this is a fun thing. Car needs quite a bit of work, (to say the least) and is progressing well .I have had to renew all the coffin arms and these have an inner pivoting bush and an outer bush where the control arm, (tuning fork) bolts on. There is also a rear control arm with a rubber bush to the chassis on the rears. I’ve had to renew all these components as the existing 21 year old bushes were seized solid on the pivoting bolts and were far past their best. Looking at all the new components with their new very firm rubber bushes in place I am wondering whether to continue with my plan of pressing these out and renewing with polybushes. I have already bought the new polybushes, unopened packs so I guess I could return them. I have black for the inner pivoting bushes and the standard purple, (because black aren’t available for the outer bush where the control arm attaches. Question: at this stage, am I wasting time fitting the polybushes? Will the benefit be so small that I will barely notice over the new rubber bushes.? This would involve pressing out 10 brand-new bushes and of course fitting the polybushes. Car will be running standard engine, different exhaust, track brake pads, R888’s , polybushed ARB’s and some lighter seats. Looking for fun days with a capable car, not a race car… Quote Link to comment Share on other sites More sharing options...
½cwt Posted December 9, 2023 Report Share Posted December 9, 2023 All depends what you want to achieve. Ride will be come less and less supple (something the Boxster is good at) the more hard bushes you add, as the flex of the OE rubber is part of the suspension design.... You need to decide what you want - Race car, track car that is tolerable on the road or road car that's pretty decent on track. That the moment what you are doing seems to be heading at the middle option, but you seem to be saying you want the third option. Quote Link to comment Share on other sites More sharing options...
phazed Posted December 9, 2023 Author Report Share Posted December 9, 2023 i’ll have a couple of glasses of wine and think about it ! Quote Link to comment Share on other sites More sharing options...
ricof Posted December 9, 2023 Report Share Posted December 9, 2023 All my coffin arms have been polybushed. It feels noticeably more taught. I would recommend it if you can do it. Quote Link to comment Share on other sites More sharing options...
phazed Posted December 9, 2023 Author Report Share Posted December 9, 2023 I can do it. I have a press in the garage. It almost seems like sacrilege to push out the bushes on brand new coffin arms! Quote Link to comment Share on other sites More sharing options...
ricof Posted December 10, 2023 Report Share Posted December 10, 2023 10 hours ago, phazed said: I can do it. I have a press in the garage. It almost seems like sacrilege to push out the bushes on brand new coffin arms! Who said this was a sensible hobby! Quote Link to comment Share on other sites More sharing options...
TV8 Posted December 10, 2023 Report Share Posted December 10, 2023 10 hours ago, phazed said: I can do it. I have a press in the garage. It almost seems like sacrilege to push out the bushes on brand new coffin arms! What make are the new coffin arms? Quote Link to comment Share on other sites More sharing options...
½cwt Posted December 10, 2023 Report Share Posted December 10, 2023 12 hours ago, phazed said: I can do it. I have a press in the garage. It almost seems like sacrilege to push out the bushes on brand new coffin arms! So in theory you could run on standard for a bit, then fit the poly bushes and decide then... As everything will have been apart recently it shouldn't take long to do the swaps. 🤣 Oh, and then the tracking after each fitment. Quote Link to comment Share on other sites More sharing options...
phazed Posted December 10, 2023 Author Report Share Posted December 10, 2023 Exactly! Quote Link to comment Share on other sites More sharing options...
bally4563 Posted December 10, 2023 Report Share Posted December 10, 2023 Was there not some on here who poly bushed and ended shearing the wishbone off? Quote Link to comment Share on other sites More sharing options...
½cwt Posted December 10, 2023 Report Share Posted December 10, 2023 (edited) . Edited December 10, 2023 by ½cwt Quote Link to comment Share on other sites More sharing options...
K.I.T.T. Posted December 10, 2023 Report Share Posted December 10, 2023 10 hours ago, bally4563 said: Was there not some on here who poly bushed and ended shearing the wishbone off? Yep. Quote Link to comment Share on other sites More sharing options...
phazed Posted December 10, 2023 Author Report Share Posted December 10, 2023 Care to elaborate on that please Quote Link to comment Share on other sites More sharing options...
edc Posted December 11, 2023 Report Share Posted December 11, 2023 It was @ragpicker or one of his posts of somebody he knew. Quote Link to comment Share on other sites More sharing options...
phazed Posted December 11, 2023 Author Report Share Posted December 11, 2023 I can sort of see that being a problem being too stiff on our roads given their quality! Should be fine on track as the track surface generally is like a billiard table by comparison. Quote Link to comment Share on other sites More sharing options...
bally4563 Posted December 11, 2023 Report Share Posted December 11, 2023 9 hours ago, phazed said: I can sort of see that being a problem being too stiff on our roads given their quality! Should be fine on track as the track surface generally is like a billiard table by comparison. I believe the said car was track focused and it happened on a track, from memory and he was running a quite a large negative camber Quote Link to comment Share on other sites More sharing options...
Lennym1984 Posted December 13, 2023 Report Share Posted December 13, 2023 I have had polybushes on my Cayman for about 3 years in which time I probably did ~30 track days. I have had no issues whatsoever and no cracks. I believe the snapped arm you are referring to was the tuning fork - this is a ball joint not a bush and so swapping the ball joint for a bush (of any material) will create issues. On the road I have had no squeaking or issues of any sort. Yes there is a little more vibration in the cabin (it's the kind of high frequency vibration you get when driving over rough roads) but it is not an issue. I no longer use my Cayman on track but will keep the polybushes on regardless. 1 Quote Link to comment Share on other sites More sharing options...
edc Posted December 13, 2023 Report Share Posted December 13, 2023 1 hour ago, Lennym1984 said: I have had polybushes on my Cayman for about 3 years in which time I probably did ~30 track days. I have had no issues whatsoever and no cracks. I believe the snapped arm you are referring to was the tuning fork - this is a ball joint not a bush and so swapping the ball joint for a bush (of any material) will create issues. On the road I have had no squeaking or issues of any sort. Yes there is a little more vibration in the cabin (it's the kind of high frequency vibration you get when driving over rough roads) but it is not an issue. I no longer use my Cayman on track but will keep the polybushes on regardless. It was the cylindrical bush that was changed. Quote Link to comment Share on other sites More sharing options...
Ninesomething Posted December 13, 2023 Report Share Posted December 13, 2023 I polybushed everything possible on my Subaru. The ride suffered but it was on coilovers anyway so it wasn't great in the first place. On the positive side it just felt totally composed however hard you pushed it and they tyres wore absolutely evenly from side to side - not something Subarus are known for. I guess everything was staying in alignment better without the flex. That said I don't feel that the Boxster has a huge amount of slop in the first place. You know that Spyder performance sells polybushed arms of the shelf? Quote Link to comment Share on other sites More sharing options...
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