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Old 01-13-2007, 10:22 PM   #46
750HP turbo E46 M3
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Join Date: Dec 2002
Location: whopbridge
Posts: 1,587

Originally Posted by JazzM

What he said I'll officially put it up for sale this week. Tom still thinking?
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Old 01-14-2007, 12:00 AM   #47
Join Date: Apr 2002
Location: Ottawa
Posts: 3,285
Originally Posted by X5HogTown
re Check the trunk...

Check the rear for diff mount and subframe tears and broken welds.

A fair number of cases. Affects all Z3s. Adding additional power will provoke the problem. I'm sure Tom will give us the technical details.

Manimillion, the car I PMed you about was fixed by BMW.
How hard is it to prevent this from happening if a car doesn't have this problem yet?

And is there any permanent solution?
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Old 01-14-2007, 01:59 AM   #48
Goin' Diesel
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Join Date: Aug 2003
Location: TaxTown
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I installed Ireland Engineering urethane subframe mounts on mine. This reduces the play and transfers more load onto the main mounts. This 'might' help prevent the problem but it's not a permanent solution. If you're going to subject the rear-end to excessive shock, you'll need to get a kit from Randy Forbes or Dinan. This will cost a few bucks but it will be built like a brick shithouse when you're done.

I would get the urethane subframe mounts to start. Install a kit if and when it's required.
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Old 01-14-2007, 02:36 AM   #49
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Join Date: Oct 2003
Location: Milton
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Stay away from the dinan kit... there's a lot of articles around comaring the RF kit to Dinan.

Also its a lot less exensive to install the RF kit prior to any significant damage occuring. It will look like stock as well, like it came from the factory.

Good point on the IE urithane bushings. I had those for about a year before the subframe issues started to take place (my car will be 10 years old this coming may). You'll notice the welds in your trunk floor start to pop at first. That will be caused by the trunk floor seperating from the differential mount (subfloor). After that its a matter of months before you're in a lot of trouble.

Another way to stiffent the rear end is to use the butt-brace front strong strutt as well as the side brace. I have their front shock tower brace and have heard good things regarding the rear brace. I will most likely be getting it later on this year.

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