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Old 06-12-2006, 05:39 PM   #1
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Join Date: Feb 2003
Location: Huntington Beach, Ca.
Posts: 447
My Ride: 2001 S54 M Roadster
e46 Rear sub-frame tear issue

Hi All -

We knew racing the car we'd have to do this - not even an option - and sooner rather than later. We figured right . . .

What we'll be putting in the car: Turner Subframe Re-inforcement kit, some prepared class legal TMS solid rear subframe bushings, new RTABs, and from Rob and Dale at MPACT, some RTAB bushings and the new prepared class legal rear control arms.

So you want to do the rear subframe re-inforcement project? Well, the rear diff., exhaust and gas tank need to come out. I took the opportunity to hit the gas tank with a little Simple Green (after covering all the openings). Note: it is a good idea, if you know you'll be doing this, to try and have as little gas in the tank as possible.
(as usual, hi res can be found in my photo gallery)

Then we hauled the car to BMS, where they pulled the rear sub-frame out.

Result of inspection after 3 race events: One tear starting in the rear subfloor (passenger side), rear sub-frame bushings starting to tear, and RTABs shot. Below, you can see the tear which Herm had already welded and primed by the time I got there. It's the way line in light gray in the lower center part of the picture.

Herm of BMS working on reinforcing the rear sub-frame area

A part of the TMS reinforcement kit installed (sorry for being blurry)
02 M3 SMG - Prepared Class BMW Club Racer
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