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thanks for the heads up...have bmp on tight (m) (archive)

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Posted by marty on March 02, 2001 at 20:59:30:

In Reply to: so which sway bars do you recommend ? posted by Kenny (South Park) on March 02, 2001 at 20:33:40:

If you have installed the Racing Dynamics sway bars (or for that matter, any other aftermarket sway bar in the rear) please check it if you have NOT REINFORCED THE MOUNTING TABS ON THE TRAILING ARMS.

Today, I finally got around to having my rear mounts reinforced with the Dinan parts by welding. When the car was put up on the lift, I was shocked to see that the driver's side had bent down to the point of hitting the trailing arm and starting to crimp the brake line! The passenger side had only bent down about half way. When the mounting tabs starts to bend down, it is not a lineal thing. That is, they reluctantly bend down slowly at first, and as they weaken, they fail more rapidly.

What I'm getting at is the possibly of someone going through a full bore curve, having one of the mounting tabs bend down and fail severely and then losing the brakes at least in the rear on one side, because the mount with the bushings bent down and crimped the brake line. It could be a recipe for disaster IMHO.

The Dinan parts fit nicely, and the job went well at a muffler shop. Dinan failed to send along directions, so I called them, and they faxed the directions to me. They were quite detailed and a great help. One hours labor, total job $53.00.

If you want a good temporary fix, a small metal plate from the bottom nut off the mounting tabs over to the trailing arms would help support it. Again, no offense to anyone with Racing Dynamics products, but a twelve year old could have designed these mounts better. The metal "triangles" that Racing Dynamics sends along to place above and below the mounting tabs on the trailing arm simply do not work. I saved mine to show how bent up they are. It's also hard to fault BMW, because the mounting tabs seem to be adequate with the stock rear sway bar.

I have both ends of the car set on "loose" at this point. But I want to try the rear on "tight". Shawn, you warned me it will be too harsh a ride with the rear on "tight", still feel that way? ( Most roads in FL-USA are in smooth and in good shape.) Check those mounts for safety's sake!

98/2.8/Boston Green/Peanut Butter Top/Beige Extended Leather/Wood/Chrome/Power top/17"/Heated Seats & Mirrors/Supersprint Exhaust S.Tips/ Dinan Cold Air Intake, Dinan Stage 2 Chip, Dinan Strut Brace/Racing Dynamics Sway Bars/MZ3 shifter/Ron Stygar Clutch Stop/Wind Deflector/Rockford Fosgate Punch100Amp/Boston Acoustics Pro 6.5s/VI Radar-hard wired/Schroth Seatbelt Pads/"LeatherZ" armrest/SS "Roadster" License Frame/BMW Valve Caps/Noah cover/Red Line 10W40

for a few hundred miles now. Car is tight,ride no harsher, slightly less understeer 00 2.8
will check this out, needs retorqing anyway.
No mention of this problem in their directions.

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