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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 03-21-2015, 05:51 PM   #1
CarbonZHP
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Need info about the Convertible A Frame Reinforcement

I just installed my new (to me) Magnaflow 16533. Because of the piping diameter and slant, the convertible A Frame support that does under the car wont bolt back on. I need to know the effects of this. Right now Im on HR race, so Im wondering if it would only be handling effects, or if this could hurt something
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Old 03-22-2015, 11:07 PM   #2
Greg330CI
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I am not a qualified engineer, however, my understanding is that the A frame support is structural, and is there to stabilise the chassis on the vert. Coupes and saloons get stability from having an integral metal roof structure. I would not drive the car without having the A frame bolted back on as it will affect handling and allow the chassis to "twist", especially over uneven road surfaces and cause other possible damage later.
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Old 03-23-2015, 09:41 AM   #3
CarbonZHP
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Looking online, it is called the "Pull Rod Vibration Dampener". After driving for 2 days I feel no difference in the chassis.
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Old 03-23-2015, 07:04 PM   #4
Greg330CI
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I just work on the premise that the BMW design engineers put it there for a reason, therefore it must serve some useful purpose! If it serves as a vibration dampener, then I assume you will feel more vibration in the steering or suspension especially on uneven roads. Do you know the P/N for it?
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Old 03-23-2015, 07:11 PM   #5
CarbonZHP
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Left: 51717002725
Center: 51717020587
Right: 51717002726
(Right side not pictured)

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Old 03-23-2015, 07:49 PM   #6
Greg330CI
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Thanks for that. Since these vibration dampeners are unique to BMW convertibles, I assume they are there to reduce vibrations that are also unique to convertibles. These are usually caused by the convertibles chassis being a less rigid structure, as they have no integrated roof. Therefore not having it connected may increase vibrations which may have an effect on other parts of the vehicle over time. Time will tell!
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Old 03-23-2015, 07:52 PM   #7
CarbonZHP
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Thank you. There seems to be no info on this piece online. I have yet to push the car hard, but rigidity feels the same. Vibrations are not really a factor given my suspension setup anyway
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Old 03-23-2015, 08:22 PM   #8
Greg330CI
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Good luck with it. Nice looking car too. Here's my 330Ci "Individual"
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Old 03-23-2015, 08:23 PM   #9
CarbonZHP
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Looks good. Like the color combo
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Old 03-23-2015, 09:18 PM   #10
Greg330CI
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Yes, it's Orient Blue with Champagne Napa Leather. Dark "Piano" trim.

I like your trunk spoiler, did you retro fit it? If so, where did you get it?
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Old 03-23-2015, 09:20 PM   #11
CarbonZHP
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The little lip on top of the trunk? I just bought that on eBay. It was very cheap, comes pre painted.
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Old 03-23-2015, 09:23 PM   #12
Greg330CI
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Yes, can you recall which supplier? Does it just "stick on" with double sided tape?
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Old 03-23-2015, 09:25 PM   #13
CarbonZHP
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Yep, heres yours: http://www.ebay.com/itm/USA-Painted-...item51ad5db7e1

And yes just stick on tape. No issues.
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Old 03-23-2015, 09:32 PM   #14
Greg330CI
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Thanks, good talking to you!
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Old 03-23-2015, 10:00 PM   #15
Max'd out
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The vibration dampeners are for the battery compartment (Bentley Manual pg 400-6). The brace under the car that is under the exhaust is called the rear V-brace and adds rigidity to the rear chassis (Bentley Manual pg 400-8). You probably need that V-brace for rigidity.
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