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fredmeister fredmeister is offline
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Join Date: Oct 2002
Location: Baltimore, MD, USA
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Originally Posted by PorscheGAL View Post

I found a crack on the crossmember subframe where the torsion bar retaining cap rest. Obviously, it will need to be welded, but how? Does the subframe need to come off or can it be welded in place?

I don't know how this could happen. I'm in the middle of a suspension refresh and found this problem.

Side view

bottom view
There is another crack in the top picture in the web of the piece that concerns me more. Problem with a crack, especially in an aluminum part that is susceptible to fatigue failure, is that once it is cracked it fails quickly.
You have to realize that the load from the torsion bar is reacted at the steel insert in the upper corner of the crossmember so you dont want it cracking in that area.
If it were me, I would go with the replacement piece and avoid using the welded piece.

1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max
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Old 07-04-2012, 07:23 AM
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