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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jan-21-2020, 06:01:01 AM   #11
mixxalot
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Default Re: Subframe crack in my 2006 M3!

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Originally Posted by GG///M3 View Post
If you’re going to do the fix have them do the plates and the mason rear floor/rear shock tower tie in reinforcement. Will make it much less prone to these issues in the future


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Great idea, I will see what the HMB tells me this week.
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Old Tue, Jan-21-2020, 06:19:27 AM   #12
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Default Re: Subframe crack in my 2006 M3!

If you're going to reinforce it, plates don't do jack shit on their own. You need a CMP or Vince bar type thing, or an X brace. If anything plates on their own do more harm than good. Not sure if it's been said yet in this thread so apologies if I'm repeating stuff
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Old Tue, Jan-21-2020, 07:27:16 AM   #13
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Default Re: Subframe crack in my 2006 M3!

If you're keeping the car, fix the RACP issue properly. Have a shop stop-drill and weld the cracks, then weld plates on top, then install a top-side reinforcement kit like the one CMP Auto Engineering sells.

http://cmpautoengineering.com/

If you just have plates welded on the underside, the RACP will crack again. This is a bandaid fix, not a permanent solution. You need to remove the load from the RACP and direct it elsewhere or it will happen again.

As for the other problems your M3 is having at the moment, they're normal & well known issues. These cars are getting old now so seals and rubbers and shit are well and truly worn out.

My advice would be to spend the coin, have everything fixed and hold onto her.

No other cars out there can replicate the feeling and enjoyment of a relatively (to today's performance cars) lightweight rwd performance car.
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Old Tue, Jan-21-2020, 01:30:33 PM   #14
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Default Re: Subframe crack in my 2006 M3!

If you're keeping the car, you should really add locking down the vanos to that list, as well. Once it's failed, it's too late-- "checking it" is meaningless.
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Old Tue, Jan-21-2020, 01:38:26 PM   #15
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Default Re: Subframe crack in my 2006 M3!

You'll also want to add a new diff cover, front diff bushing, csb and guibo to your list if you decide to reinforce.
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Old Tue, Jan-21-2020, 01:48:24 PM   #16
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Default Re: Subframe crack in my 2006 M3!

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Cool thanks I was worried that it was not worth fixing. Funny as the dealer never caught the subframe issue at the last inspection and mine only has 75k miles. I've heard stories of low mileage M3 having this issue since it is a design flaw of the BMW E46 unfortunately. Love the car and have owned her for 10 years. Would have to buy something like an R8 or Ferrari to have better sport feeling car or 911 Turbo and then we are talking 100k for a decent used one.

Glad that I took it to an indy shop!
If you think this car is having expensive issues, Porsches and Ferraris are definitely not for you.
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Old Tue, Jan-21-2020, 02:48:02 PM   #17
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Default Re: Subframe crack in my 2006 M3!

Um yeah probably best to fix it and keep her- values are climbing and I have loved the car for the past decade. What does locking down the VANOS mean exactly? Sorry, but I am not a mechanic :-)

I will ask HMB about the long term solution for the RACP subframe issue. They are better than the dealers I have dealt with in the past in terms of catching things.
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Old Tue, Jan-21-2020, 02:49:54 PM   #18
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Default Re: Subframe crack in my 2006 M3!

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If you think this car is having expensive issues, Porsches and Ferraris are definitely not for you.
Porsches really? I thought they were solid reliable sports cars? I do know how bloody expensive older Ferraris are. Just 5-10k to pull the engine and do some things that may cost 1-2k on an M3. Plus I like the M3 better for daily driver. Ferrari are too wide and over the top attract negative attention. Now if I won the powerball lottery I'd love a brand new R8 or AMG GT! But would get a vintage M3.
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Old Tue, Jan-21-2020, 03:12:04 PM   #19
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Default Re: Subframe crack in my 2006 M3!

Yeah that is all routine maintenance. Just open your wallet and smile. These cars are built like shit, what can you do?
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Old Tue, Jan-21-2020, 03:16:31 PM   #20
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Default Re: Subframe crack in my 2006 M3!

That looks like +$7k worth of work from a reputable indy.... depending on condition and mileage of the car I'd just sell it as is and move on. These car's take a lot and they're not really worth their cost in repair or preventative maintenance - not to mention mods.

Just not sure what you'd replace it with...
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Discussing Subframe crack in my 2006 M3! in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)