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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 01-19-2015, 04:06 PM   #1
Mcmack
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Subframe issue reality

How real of a problem are the subframe issues in a later model m3? I have a 2004 with 100k on it and haven't seen any signs when I was crawling around under it. I didn't know if it was more prone to be an issue on the early years like the vanos issues were.
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Old 01-19-2015, 04:38 PM   #2
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Subframe mount failure is a function of how the car was driven by earlier owners. Power launches at high RPM from a stop was very popular among new (and subsequent) owners. Run the RPMs high and dump the clutch for dramatic "low ET" times was a popular discussion thread topic. Owners were asked whether they were concerned about the effect on the car of these "power launches" and the standard answer was that they were leasing and would be out of the car after the warranty was up "and it would be some else's problem".

And now its someone else's problem.

Vanos issues can happen evenly through the E46 M3 production years.

The 2006 E46 M3 got the heavier vert subframe and is a lot less prone to the issue.
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Old 01-19-2015, 06:19 PM   #3
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Originally Posted by Mcmack View Post
How real of a problem are the subframe issues in a later model m3? I have a 2004 with 100k on it and haven't seen any signs when I was crawling around under it. I didn't know if it was more prone to be an issue on the early years like the vanos issues were.
Please search, this has been discussed many times in great detail and your information on the subframe and vanos is incorrect as Alan points out.
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Old 01-19-2015, 06:28 PM   #4
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Ah I see. Thanks for the info, it seemed that most of what I had read about the vanos issues occurred in the early model years. I haven't seen any issues so far so I guess the best thing to do for now is keep an eye out and just take the best care of it that I can.
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Old 01-19-2015, 07:16 PM   #5
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The best thing to do is get the car on the lift and have the subframe inspected. You're not going to see jack crawling around underneath it until it's really bad. If your subframe is good then kudos, you get to reinforce it.
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Old 01-19-2015, 08:14 PM   #6
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What's your recommendation for subframe reenforcement kits?
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Old 01-20-2015, 08:01 PM   #7
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If there are no cracks (none at all, needs to be very thoroughly inspected) then foaming should be sufficient. If there are cracks you will need to weld/epoxy plates in and add foam afterwards if you so choose, plenty of threads on all 3 of these options.
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Old 01-20-2015, 08:03 PM   #8
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Thanks again
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Old 02-08-2015, 02:29 PM   #9
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Hi does anyone know if the vert subframe is stronger than the coupe or are they just the same??
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Old 02-08-2015, 06:47 PM   #10
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Hi does anyone know if the vert subframe is stronger than the coupe or are they just the same??

Stronger.
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Old 02-08-2015, 06:51 PM   #11
Joe boy M3 1690
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Excellent thanks mate for reply
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Old 02-08-2015, 07:05 PM   #12
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Hi does anyone know if the vert subframe is stronger than the coupe or are they just the same??
This has been discussed. The vert is stronger, and the 2006 coupe has the vert rear floor.
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Old 05-17-2015, 03:24 PM   #13
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This has been discussed. The vert is stronger, and the 2006 coupe has the vert rear floor.
Did the stronger subframe from the vert only get installed on 06 model coupes? I ask because(of course) I have an 05 coupe. Any chance any or all of the 05s had it installed?
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