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I rebuilt all of my suspension a year ago and have done little mileage in that time and thought i must get the front and rear tracking done by someone who knows what their doing. I used all powerflex split type poly bushes as advised by sj sports cars and seemed to make sense even though i had intended originally to replace with new oem rubber ones.

Ive spoken to a few of the other knowledgeable specialists that we know and trust on here and ive been told they are total crap and suspension alignment cant be done with them and i should first replace them with oem rubber or lotac poly bushes.

What say you all? I was thinking of ripping them out and sticking rubber back in.

Edited by Smithy111

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The front upper split ones are bloody awful - they literally wobbled all over the place on the S4 - dire things


Only here once

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I'm a sucker for originality and also know that Lotus designed the original bushes with the corect shore rating for the intended application. The rubber provides part of the characteristics of the handling which I'm not convinced is replicated by the poly bushes. 

I've no hard evidence to backup my assumptions its just personal opinion.  :)


It's getting there......

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The Lotus OEM are a pain in the backside to push in,  like most OEM bushes on other brand cars,  but for a reason as it means they are stiff when fitted,  a split poly bush is easy to push in as it is two bits,   they will just not bite into the suspension like the standard ones,  maybe for a few miles but after that they will loosen up,   in fact giving the same feeling as worn/perished oem ones imo.

I personally would stick to the Lotus ones,  the suspension set up on the Esprit is what makes the car,  going away from this is not a good idea imo.

 

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A

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It would be interesting to find some data to back this up one way or another, all the comments seem very opinion rather than data driven, which is not how good engineering should be done. I have a friend at Brooks University so I will ask if any undergraduate has done a project on the subject. The added problem is not all OEM bushes or Poly bushes are created equal!

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10 minutes ago, C43 said:

It would be interesting to find some data to back this up one way or another, all the comments seem very opinion rather than data driven

Fact based - on my S4 which had the split in half yellow bushes with sleeves fitted on the top arms. You could actually move the top arms side to side - bottom arm masked this and made the mot pass possible. But it was frankly awful. Once the bottom arm was removed from the car - the top arms moved about and inch from side to side. Replacing with the cheapo rubber oem ones and it was rock solid.

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The way i look at it C43,   The o.e.m have the metal outer sleeve,  fused rubber sticking to that and then the internal steel liner.

The split bushes are missing the outer sleeve, are easier to fit,  I think for such things poly bushes are ok for rack mounts etc,  but for wishbones etc,  i would rahter steer clear,   I personally would say it was a no brainer,  but if you can get someone to do an actual experiment,  i think that would be fab and would love to see or just even hear about the date.   :thumbup:

We are all split into different camps when it comes to rebuilding these cars,  even more so regarding modern aftermarket parts alternatives,  some love the poly bushes,  some will not touch them.   Exactly the same with the camp protech, camp avo etc.  :)

I say ditch the bushes, build custom top arms and fit rose joints lol

 


A

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Ok so the consensus is ive been badly advised by sj and should switch back to some nice new oe rubber ones (lotac too expensive). The car currently has purple powerflex arb bushes (only option was told think these are fine), black front poly bushes and purple rears (this is what sj sent me and when questioned colour they said their all the same!?).

My next question is will i be able to press the metalastic bushes in using a nut/bolt/threaded bar and washers as ive heard people have had success with (assuming heat the arm and freeze the bushe overnight?

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You really need a press, you can borrow mine if you wish.

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Ah thanks Fabian! Ill let you know when i start on that task!

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On 16/08/2019 at 00:00, Smithy111 said:

Ok so the consensus is ive been badly advised by sj and should switch back to some nice new oe rubber ones (lotac too expensive). The car currently has purple powerflex arb bushes (only option was told think these are fine), black front poly bushes and purple rears (this is what sj sent me and when questioned colour they said their all the same!?).

My next question is will i be able to press the metalastic bushes in using a nut/bolt/threaded bar and washers as ive heard people have had success with (assuming heat the arm and freeze the bushe overnight?

this sounds the same as mine. I have just got the car back on the road after a 3 year rebuild and have done 500 miles in it. I also have an Evora and this is my 10th lotus so I know a little about the marque. I have to say the steering on my Esprit is as good as any Lotus I have owned so I really don't think there is much wrong with it. The geometry is spot on which helps. I don't seem to have excessive harshness from the poly bushes at the rear. 

As far as the life of the bushes I am not sure any of us do enough mileage in our Esprit after a rebuild for this to be an issue.

I did stick with original damper rates which for me is important (but again its up to the individual). 

I did rose joint a 7 many years ago which at the front made a big difference to steering feel but did give an increase in NVH.

I think we all build them differently, that's part of the fun!

C43 

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On 14/08/2019 at 18:35, silverfrost said:

The Lotus OEM are a pain in the backside to push in,  like most OEM bushes on other brand cars,  but for a reason as it means they are stiff when fitted,  a split poly bush is easy to push in as it is two bits,   they will just not bite into the suspension like the standard ones,  maybe for a few miles but after that they will loosen up,   in fact giving the same feeling as worn/perished oem ones imo.

I personally would stick to the Lotus ones,  the suspension set up on the Esprit is what makes the car,  going away from this is not a good idea imo.

 

As Dan states, most particularly in his closing sentence.

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Of my Esprit drives the most gratifyingly  tactile was in an S1 fitted with Koni dampers, Pirelli P7's on correctly spec'd rims and the upgraded lower TC arms up front. All else was as stock, low mileage and in good knick. Therefore I choose OEM rubber where available with the hope it is of correct spec. 

Cheers

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