polybush or oem

General E30 related discussions -
Please put technical questions in E30 Tech Help forum below

Moderator: martauto

User avatar
Stonkin
E30 Zone Newbie
E30 Zone Newbie
Posts: 151
Joined: Sat Oct 13, 2012 11:00 pm
Location: West Sussex

Post Sat Jan 05, 2013 5:38 pm

Hi, i have had a look through the search but this topic seems to vary hugely.

I want to replace all bushes for my build, the only ones i dont need are arb's and diff mount as i have these.

Its a track car, but will also be used on the road, but not as a daily driver.

Should i fit oem or polybush, or perhaps a mix? I also understand i can fit eccentric where possible.

I have heard that the poly's can sometimes cause issues and come loose, not last long and also make the ride awful.

Can you recommend any suppliers for either option?

Cheers

Christian
daimlerman
**BANNED**
Posts: 15968
Joined: Mon Feb 27, 2006 11:00 pm
Location: Grumpy Old Man

Post Sat Jan 05, 2013 5:44 pm

I use polybushes on my cars,in all locations except the rear beam mount.

I am prepared to cope with the transmitted road noise as I get a tighter feel to my cars.

Rear beam is designed to allow a bit of rear wheel steer,fitting polybushes removes this 'safety net',so I would not recommend for this reason.
Youth is wasted on the young.
G-Bear
E30 Zone Squatter
E30 Zone Squatter
Posts: 1631
Joined: Wed Mar 12, 2008 11:00 pm
Location: Hertfordshire

Post Sat Jan 05, 2013 7:31 pm

Same as what daimlerman has said... Perhaps go for lemforder (oem) on the rear beam and poly the rest seeing as it sounds like its more for track use..
HairyScreech
Engaged to the E30 Zone
Engaged to the E30 Zone
Posts: 6265
Joined: Sun Jan 21, 2007 11:00 pm

Post Sun Jan 06, 2013 4:44 am

daimlerman wrote:I use polybushes on my cars,in all locations except the rear beam mount.

I am prepared to cope with the transmitted road noise as I get a tighter feel to my cars.

Rear beam is designed to allow a bit of rear wheel steer,fitting polybushes removes this 'safety net',so I would not recommend for this reason.
The 75a poly bushes should be a good compliment to modern tyres (which are capable of generating more force than 80s tyres) and behave a lot like the void fillers but a full 90a bush is too hard agreed.
2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822

m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
User avatar
Stonkin
E30 Zone Newbie
E30 Zone Newbie
Posts: 151
Joined: Sat Oct 13, 2012 11:00 pm
Location: West Sussex

Post Sun Jan 06, 2013 9:00 am

Cheers guys.
Would it be well worth considering buying new front control arms with ball joints? Is there a recommended place to get these items?
daimlerman
**BANNED**
Posts: 15968
Joined: Mon Feb 27, 2006 11:00 pm
Location: Grumpy Old Man

Post Sun Jan 06, 2013 9:43 am

Stonkin wrote:Cheers guys.
Would it be well worth considering buying new front control arms with ball joints? Is there a recommended place to get these items?
If buying complete arms,look for Lemforder items,contact meatballs82 for a price,he is the zone contact at ECP.

Another option is just to swap the balljoints in your existing arms,but for this you will need the proper tool,available from ebay for about £100.If you ask BSS325i nicely,he can probably put up the link again.

An advantage of using polybushes on the wishbones is that they are in two parts,so can be swapped onto replacement wishbones at a later date.
e30den
E30 Zone Regular
E30 Zone Regular
Posts: 502
Joined: Fri Jul 27, 2007 11:00 pm
Location: East Kent

Post Sun Jan 06, 2013 1:08 pm

Stonkin wrote:Cheers guys.
Would it be well worth considering buying new front control arms with ball joints? Is there a recommended place to get these items?
Or you could have a look here www.meyle.com
User avatar
Stonkin
E30 Zone Newbie
E30 Zone Newbie
Posts: 151
Joined: Sat Oct 13, 2012 11:00 pm
Location: West Sussex

Post Sun Jan 06, 2013 5:25 pm

Thanks guys, will check out both those options
User avatar
Brianmoooore
E30 Zone Team Member
E30 Zone Team Member
Posts: 49360
Joined: Mon Jan 10, 2005 11:00 pm

Post Sun Jan 06, 2013 5:34 pm

daimlerman wrote:
Another option is just to swap the balljoints in your existing arms,but for this you will need the proper tool,available from ebay for about £100.If you ask BSS325i nicely,he can probably put up the link again.
No BMW special tools required to change ball joints. A hydraulic press and associated accessories is desirable, but it can be done with an angle grinder, a large punch, an even larger hammer and a block of wood or two.
The special tool is for removing control arm bushes intact (which you won't need to do if you change the ball joints), and even this can be done by hand if you lift the rubber around the pin with a small screwdriver and introduce a little silicon grease at several points around its circumference.
User avatar
Stonkin
E30 Zone Newbie
E30 Zone Newbie
Posts: 151
Joined: Sat Oct 13, 2012 11:00 pm
Location: West Sussex

Post Sun Jan 06, 2013 5:54 pm

I'm sure i read that if you plan on fitting eccentric powerflex polybushes they will only fit onto lemforder arms? Anyone know if this is true
DanThe
E30 Zone Team Member
E30 Zone Team Member
Posts: 28649
Joined: Sat Sep 10, 2005 11:00 pm
Location: Staffs

Post Sun Jan 06, 2013 6:49 pm

Why not just use the BMW eccentric bush? Solid rubber and wont fall out, £30 odd for the pair.
bss325i
E30 Zone Team Member
E30 Zone Team Member
Posts: 24532
Joined: Sat Jan 20, 2007 11:00 pm
Location: London/Surrey

Post Sun Jan 06, 2013 8:25 pm

Brianmoooore wrote:
daimlerman wrote:
Another option is just to swap the balljoints in your existing arms,but for this you will need the proper tool,available from ebay for about £100.If you ask BSS325i nicely,he can probably put up the link again.
No BMW special tools required to change ball joints. A hydraulic press and associated accessories is desirable, but it can be done with an angle grinder, a large punch, an even larger hammer and a block of wood or two.
The special tool is for removing control arm bushes intact (which you won't need to do if you change the ball joints), and even this can be done by hand if you lift the rubber around the pin with a small screwdriver and introduce a little silicon grease at several points around its circumference.
No, the tool Malcolm mention is for removing an replacing the Ball joint without messing about with removing the arm from the car and using a press, not for removing the control bushes intact although there is a tool for that as well.

Ball joint tool page 116.

http://www.asttools.co.uk/pf5catalogue.html
http://www.bmrperformance.co.uk

BMW and MINI specialist - Gatwick
daimlerman
**BANNED**
Posts: 15968
Joined: Mon Feb 27, 2006 11:00 pm
Location: Grumpy Old Man

Post Mon Jan 07, 2013 2:20 am

Thanks,Barry.

The first time you mentioned this tool,I had just replaced a pair of wishbones,buying the tool and the balljoints works out only slightly more expensive and leaves the tool 'paid for' next time.... :D
Youth is wasted on the young.