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cbr6dc
Montreal


Joined: 05 Oct 2015
Posts: 509



PostPosted: Thu Jan 26, 2017 10:46 pm    Post subject: Coffin arms Reply with quote

Easy to replace? I've had some thoughts and suggestions on it.

I need to do the rear shocks as well which I won't be able to tackle yet but assuming the bolts aren't seized look quite an easy job?
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04/16-09/17 - 996.1 C2 Cabriolet
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MisterCorn
Zolder


Joined: 08 Jan 2011
Posts: 5297
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Jan 26, 2017 10:59 pm    Post subject: Reply with quote

Yes, easy if the bolts aren't seized. More of a pain if they are.

MC
 
  
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cbr6dc
Montreal


Joined: 05 Oct 2015
Posts: 509



PostPosted: Thu Jan 26, 2017 11:06 pm    Post subject: Reply with quote

I've heard they are adjustable but if I'm getting the car set up anyway and they are roughly in the right place they won't knacker it on the way there?

Good to hear it's easy as it's a £300 job I could do without.

I've been told the Meyle ones are basically Porsche OEM but with Porsche ground off but I've also been told I need to fit them in pairs because they are different to Porsche?

Which is it?
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nordicmatter
Newbie


Joined: 05 Apr 2011
Posts: 23



PostPosted: Fri Jan 27, 2017 12:05 am    Post subject: Reply with quote

The meyle arms are not Porsche arms and the quality is some what different from the original TRW Porsche OE supplier. There is light at the end of the tunnel regarding theses considerably cheaper arms.
The ball joint is good quality and the inner bush is ok with a shore hardness of around 74-77. I measured a genuine porsche bush at a consistent 80 shore. The middle bush is very different and I purchased 5 meyle arms new and the stiffness is two thirds that of an original item at around 55- 66 shore and the Porsche is again a very consistent 80. There is a very cheap fix which I will post over the next week or so. This improves these arms better than the original ones and the drive is vastly improved. I am sure these arms are great for a boxster but on the turbo 996 and the very early 997S (same rear arms as 996) they cause the dreaded weave under hard acceration. According to google research Porsche had a fix of turning the centre bush 90 degrees to basically change the load points on the bush to act like a solid bush as per later cars. I have not confirmed this with a dealer but google 997 wiggle. These arms are also 6mm shorter than original but this is of no concearn as this can be dialled out when tracked. The other non branded eBay arms were terrible and during basic testing the centre bush split at less than 130kg. I had some old genuine arms that took 400 kg + at 12 years old. Hope this helps as it is a little project I have been working on over the past few months.

Mark
 
  
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DJP997
Newbie


Joined: 17 Jan 2017
Posts: 35



PostPosted: Fri Jan 27, 2017 11:43 am    Post subject: Reply with quote

I replaced with Meyle on my 996t - regretted it quickly and replaced with original parts.

Not worth cutting corners, just my opinion (but based on experience)
 
  
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11027
Location: Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Jan 27, 2017 11:49 am    Post subject: Reply with quote

What were your reasons for regretting it?
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jerzybondov
Silverstone


Joined: 27 Apr 2015
Posts: 129



PostPosted: Fri Jan 27, 2017 11:53 am    Post subject: Reply with quote

DJP997 wrote:
I replaced with Meyle on my 996t - regretted it quickly and replaced with original parts.

Not worth cutting corners, just my opinion (but based on experience)


Fitted on the front / back, or both?
 
  
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DJP997
Newbie


Joined: 17 Jan 2017
Posts: 35



PostPosted: Fri Jan 27, 2017 12:01 pm    Post subject: Reply with quote

jerzybondov wrote:
DJP997 wrote:
I replaced with Meyle on my 996t - regretted it quickly and replaced with original parts.

Not worth cutting corners, just my opinion (but based on experience)


Fitted on the front / back, or both?


Fitted all round. They were different measurements than original.

Required a Geo

Never felt the same. Replaced with original and difference was noticeable
 
  
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11027
Location: Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Jan 27, 2017 12:05 pm    Post subject: Reply with quote

So nothing wrong with them - just a slight manufacturing difference in length.
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lenny
Newbie


Joined: 27 Apr 2013
Posts: 36
Location: Edinburgh


PostPosted: Fri Jan 27, 2017 12:40 pm    Post subject: Reply with quote

This has thrown a spanner into the works...I was just about to order four Meyle coffin arms and forks for my C4S... Question

Any other opinions or good manufacturers other than Meyle and OEM?


Thumb
 
  
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11027
Location: Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Jan 27, 2017 12:47 pm    Post subject: Reply with quote

You've no guarantee replacing with OEM won't need your geo doing. Manufacturing tolerance from one extreme to the other will easily throw camber, toe, etc. out.
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pete_d
Newbie


Joined: 15 Jan 2009
Posts: 46



PostPosted: Fri Jan 27, 2017 12:49 pm    Post subject: Reply with quote

lenny wrote:

Any other opinions or good manufacturers other than Meyle and OEM?

Thumb


EPS are another manufacturer I've heard highly recommended. They supply control arms with polyurethane bushes; not sure if their coffin arms are upgraded or just OEM spec, but I dimly recall it was Ken at 9e who recommended them to me.
 
  
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crash7
Monza


Joined: 28 May 2011
Posts: 206



PostPosted: Fri Jan 27, 2017 1:40 pm    Post subject: Reply with quote

Based on the info above..,

Shorter LC arms mean your giving up track width and reducing negative camber the opposite of what most try and achieve.

Softer bushes are going to have more slop.

All of the above will have a negative effect on your cars handling.
 
  
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ELA
Suzuka


Joined: 30 Aug 2011
Posts: 1154
Location: Nurburgring Doorstep


PostPosted: Fri Jan 27, 2017 2:22 pm    Post subject: Reply with quote

nordicmatter wrote:
The meyle arms are not Porsche arms and the quality is some what different from the original TRW Porsche OE supplier. There is light at the end of the tunnel regarding theses considerably cheaper arms.
The ball joint is good quality and the inner bush is ok with a shore hardness of around 74-77. I measured a genuine porsche bush at a consistent 80 shore. The middle bush is very different and I purchased 5 meyle arms new and the stiffness is two thirds that of an original item at around 55- 66 shore and the Porsche is again a very consistent 80. There is a very cheap fix which I will post over the next week or so. This improves these arms better than the original ones and the drive is vastly improved. I am sure these arms are great for a boxster but on the turbo 996 and the very early 997S (same rear arms as 996) they cause the dreaded weave under hard acceration. According to google research Porsche had a fix of turning the centre bush 90 degrees to basically change the load points on the bush to act like a solid bush as per later cars. I have not confirmed this with a dealer but google 997 wiggle. These arms are also 6mm shorter than original but this is of no concearn as this can be dialled out when tracked. The other non branded eBay arms were terrible and during basic testing the centre bush split at less than 130kg. I had some old genuine arms that took 400 kg + at 12 years old. Hope this helps as it is a little project I have been working on over the past few months.

Mark


That's very interesting work you have been doing with this project Mark. I have modified and will market my own upgraded LCA's in the future. From an interest point of view, when I produce my first batch, could I send you a sample to test to see how they fair? I currently only have 4 prototype arms but unfortunately they are all fitted to my car so it will be a little while before I can send one.
Kind regards
Richard
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1275kg 997GT3RS with:
Kessels 458bhp 3.8l & vgs-MS ECU
Akrapovic titanium exhaust
Cup 9:35 diff, Airbox, PAS, front lip
BBS 19's
H&R Suspension
Carbon wings/doors/bonnet/door cards
 
  
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wasz
Kyalami


Joined: 28 Dec 2012
Posts: 1758


1999 Porsche 996 Carrera 2

PostPosted: Fri Jan 27, 2017 4:54 pm    Post subject: Reply with quote

MisterCorn wrote:
Yes, easy if the bolts aren't seized. More of a pain if they are.

MC


And they will be seized on the rear if theres no evidence of a change. So buy some new eccentric bolts in anticipation. Fronts usually not seized.

Meyle had a batch of short arms, seems to be resolved.

TRW are the OE supplier, good luck finding them anymore.
 
  
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lenny
Newbie


Joined: 27 Apr 2013
Posts: 36
Location: Edinburgh


PostPosted: Fri Jan 27, 2017 6:54 pm    Post subject: Reply with quote

Anyone got any experience with CTE from ECP they are claiming that they are OEM quality??...or do they all say that Thumb
 
  
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alex yates
Shanghai
Shanghai


Joined: 06 Mar 2014
Posts: 11027
Location: Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Jan 27, 2017 7:11 pm    Post subject: Reply with quote

OEM quality just means they are in specification laid down by Porsche.
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lenny
Newbie


Joined: 27 Apr 2013
Posts: 36
Location: Edinburgh


PostPosted: Fri Jan 27, 2017 9:18 pm    Post subject: Reply with quote

alex yates wrote:
OEM quality just means they are in specification laid down by Porsche.


Ok, thanks Alex Thumb
 
  
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nordicmatter
Newbie


Joined: 05 Apr 2011
Posts: 23



PostPosted: Fri Jan 27, 2017 10:13 pm    Post subject: Reply with quote

Quote:
That's very interesting work you have been doing with this project Mark. I have modified and will market my own upgraded LCA's in the future. From an interest point of view, when I produce my first batch, could I send you a sample to test to see how they fair? I currently only have 4 prototype arms but unfortunately they are all fitted to my car so it will be a little while before I can send one.
Kind regards
Richard

That is very interesting that you are modifying arms, have you also experienced the poor quality aftermarket arms. I have been measuring polyurethane shore hardness but more importantly deflection rates with interesting results. You are welcome to any help I could provide and I am currently working on a deflection rig to repeatedly and consistently take measurements.
I feel that rubber is still the best material for bushings but quality is paramount. I see another post relating to another fail in drive feel with aftermarket arms, this seems more apparent on the higher powered cars such as the turbo and S models. A word of warning, when working with the rear LCA centre bush be aware of the fork arm mounting to the chassis, the ball and socket is cased in plastic and is easily overloaded and cracks if the LCA centre bush is too stiff. I look forward to seeing what you have been working on and should need any input then just let me know. I have about another 500 miles to do before I strip down and re measure but as there is salt on the roads at the moment so this may take a little longer as my car is a bit of a fair weather queen.

Mark
 
  
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jerzybondov
Silverstone


Joined: 27 Apr 2015
Posts: 129



PostPosted: Fri Jan 27, 2017 11:52 pm    Post subject: Reply with quote

wasz wrote:


Meyle had a batch of short arms, seems to be resolved.

TRW are the OE supplier, good luck finding them anymore.


So you'd feel confident if you bought a pair of Meyle arms now? That batch won't still be kicking around in stock? I ask as I've just bought a pair for the front and was going to fit them early next week Surprised
 
  
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