EDC rebuild update - Page 6 - BMW M5 Forum and M6 Forums
E34 M5 Discussion 1988-1995 Sedan and Touring

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post #51 of 559 Old 8th June 2007, 09:26 AM
JED
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I now have two old fronts sitting in the garare which you are welcome to use. The off side is pretty rotten, but the near side looks in pretty reasonable condition.
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post #52 of 559 Old 8th June 2007, 08:01 PM Thread Starter
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The first set of re-built rears will be here tomorrow as I was promised and we'll be fitting them tomorrow too with new springs, top mounts etc etc. Because there's a big Ferrari race this weekend the guy has been swamped all week, so he is personally delivering them tomorrow morning for me, about a 200 mile round trip for him. He now has all the seals in that he needs and he said that internally the units were visually pretty much like new. I spoke to him lunchtime and they were just going on the dyno for final testing. This is all looking very good for us for the future, I'll try and grab some pics of the units before we fit them and hopefully do a post tomorrow night to update you all

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post #53 of 559 Old 8th June 2007, 08:36 PM
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post #54 of 559 Old 8th June 2007, 09:16 PM
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post #55 of 559 Old 9th June 2007, 05:57 PM Thread Starter
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Right, updateÖ.

At 8.30am, right on time as promised, the owner of the suspension company turned up in deepest Surrey clutching my rebuilt rears

We had a long chat about what he did, what he thought of the EDC set-up and what he thought might be able to be improved. The first thing to realise is that these rears have been rebuilt completely with Boge seals Heís not a great fan of the seal design, although they have been rebuilt back to Ďstockí they could be improved by a more modern seal. It might be a case of if itís not broke donít fix it and maybe we should just stick with the set-up but he could maybe fit a better seal set-up for us

I asked him what he thought about changing out just one unit, more specifically about fitting a rebuilt shock (front in particular) with an original unit on the other corner. I was particularly concerned because of the difficulties of matching the oil viscosity and getting the air gap right. He said that heíd feel ok about changing just one unit but his natural inclination would be to overhaul both units on the axle at the same time. He has access to all of the Boge data so heís comfortable that he can match the spec as they come from BMW. Also if we could provide him with a new front or rear to borrow then he could put it on the dyno and get all of the data that he needed, then weíd be guaranteed an exact match. But now we donít have to hang on to the Ďstill just about okí shock and just change just one, at this price itís perfectly viable to have both units on an axle rebuilt. Infact you can have all FOUR rebuilt less than the cost of a single unit from BMW

As you can see in the pic they have been cleaned up and painted, they look just about as youíd expect a new unit to look. I rebuilt the units with new springs/rubbers/top mounts and we fitted them on. The units that we removed looked like they had been on there since the car was new, no snapped springs or leaks but they were tired to say the least. Driving the car was a revelation, itís easy to forget about the rears sat back there going up and down but in some ways the results are more impressive with new rears that new fronts. I still have some steering bits to fix so the car is not 100% tight as it should be but the difference over the units we took off is night and day, itís taught and controlled in a way that Iíd forgotten. My P setting has been way too soft for a long time, I donít remember who posted recently that the P setting is just about perfect on a new set-up but heís right. I remember when I bought my LE new in 1995, the most impressive thing was the suspension and the 2 modes that just worked so well. Now I have that back again, P is a perfect driving around mode now itís tight and controlled again, and S just tightens the whole thing up a lot more

Iíve only done about 30 miles so itís early days. No leaks, dash warnings or funny noises. Iíll continue to test them for the next couple of hundred miles to check that they are performing ok, then speak to the suspension guy to see how we can open this up for everyone. Now the rearís arenít rocket science, they are just a couple of hydraulic rams with no gas sac or air gap considerations. But heís very confident that the fronts will pose no real problems and I feel very comfortable that he knows what heís talking about. We might need a guinea pig to try out a rebuilt set of fronts (form an orderly queue ) just to check they perform ok but this whole situation is pretty much ready to kick off. I gave him 2 more fronts I had and I have the rears for him too. Once weíre rolling it would be good to get all of the scrapped units up to him as occasionally heíll need to scavage parts like rods or solenoids so the more the merrier, but for now he has enough to keep him going

On a slightly more annoying note, we went to all the effort of swapping out the front right leg for the almost-new one on my spare car only to find that my clunk is still there which means that thereís a 1993 car with a complete set of 4 working EDC legs as mine was obviously ok. Ho hum, all the steeringís being changed in a couple of weeks so the new top arm should cure it but this clunk is driving me mad

There ya go, looking good, eh?
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post #56 of 559 Old 9th June 2007, 06:41 PM
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hallelujah!
fantastic job. this mechanic has a busy year ahead of him.

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J (formerly SchrickM5)
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post #57 of 559 Old 9th June 2007, 06:54 PM
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Lets keep our fingers crossed Mike and hope they still feel good after a few thousand miles. If so, then you and your engineer will have taken a massive weight off owners shoulders..mine especially....I'll have 4 please!!!! thanks for your efforts again steve
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post #58 of 559 Old 9th June 2007, 07:18 PM
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post #59 of 559 Old 9th June 2007, 07:27 PM
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Excellent news so far.

This could change the whole economics of running an E34 M5

1995 E34 M5 3.8 Arctic Silver
2000 E46 330ci Topaz Blue
2002 E39 525d Sport Touring Titan Silver
The collection grows....
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post #60 of 559 Old 9th June 2007, 07:29 PM Thread Starter
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Quote:
Originally Posted by SilverstoneDM View Post
Excellent news so far.

This could change the whole economics of running an E34 M5
You'll be even more delighted when you hear where they are based

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