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Discussion Starter #1 (Edited)
As I think I mentioned to a few people last month, the CSL was going in for some preventative maintenance work at MProve: http://www.mprovesolutions.com/ This is mainly because I've been hearing too many horror stories about subframe cracks, and as the car is very soon to fall outside of BMW's 10 year goodwill period I thought I'd bite the bullet and get the whole area strengthened up for a bit of peace of mind

I had a quick check around in Ireland but no-one seems to be doing this sort of work here, and having seen a couple of recommendations for MProve (based outside Warrington in the northwest of England) I got in contact with them. On speaking with Matt there, he informed me that he had already done the work on a few CSLs, and many E46 M3s including his own, and there were basically two options:

1) Just an epoxy resin injection on both sides of the subframe

or

2) Strengthening plates, all new subframe bushes and finally the epoxy resin injection too

The second option is really a must for anyone planning to track their cars, but even though I don't I still thought it was the option worth going for to avoid any worries going forward. The whole procedure would take about a week, mainly because the resin has to set properly over a number of days before putting it under too much stress

Anyway, I dropped the car over to MProve, and was quite impressed with their set-up. It's out in the middle of the coutryside so lots of space, and as well as the subframe repair/prevention work they also run a race team and a detailing business out of there (a few tasty motors there the day I arrived :))

So the car went up on the ramps and Matt prepared me for the likelihood that there would be some small cracks starting in the subframe, but to both his and my surprise it was clean and intact. Supposedly small cracks are easy enough to deal with anyway, although I've seen some of the pictures of M3s in the past with the floors falling out of them which I'm not sure there's much hope for
 

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Discussion Starter #3
Nice one jeff! Surprised there was no hairlines! Good sign :peace:
Thanks Mark, yeah thought there might be too, but he said it was one of the cleanest he'd seen. He reckons it's hard 1st and 2nd gear starts that do the damage
 

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I'd say that was a scary amount of cash..worth it with such a car though..I'm sure the boys tested it good in Germany with you :D
Geoff aka Toadie did no testing except for a leisurely spin around Cologne :D:D. Could do with a suspension upgrade as a bit twitchy at speed :eek::D
 

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How much did this cost if you dont mind me asking?

I have an ESS TS2 330ci so I am over the 300 whp so im looking to reinforce and I already ordered the turnermotorsport plates but not sure if these are enough and where to get it all done in Ireland is a whole other story.

My local mechanic said he doesnt mind welding in the plates but as for the structural foam BMW opted for in their repair method none of this is included..

However there repair method did suck as it only covered the rear left mounting point which was the signs of the beginning of failure however it did not prevent it.
 

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The plates on there own will make a huge difference as it spreads the stresses out over a much larger area, they usually start to crack around the edge of the subframe bush and travel from there, the resin is to tie the boot skins together as these can no be accessed without cutting some access holes which you can do and weld the skins instead of using the resin, it is very important to be very carefull rustproofing all the cavities after as the welding will burn off all the zinc coating on the inside which you can't get too and you could be causing much bigger problems down the road.
 

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Discussion Starter #8
How much did this cost if you dont mind me asking?

I have an ESS TS2 330ci so I am over the 300 whp so im looking to reinforce and I already ordered the turnermotorsport plates but not sure if these are enough and where to get it all done in Ireland is a whole other story.

My local mechanic said he doesnt mind welding in the plates but as for the structural foam BMW opted for in their repair method none of this is included..

However there repair method did suck as it only covered the rear left mounting point which was the signs of the beginning of failure however it did not prevent it.
It was £1000 for the plates, resin and all labour, and once the floor was being out anyway it was worth doing the subframe bushes too, which was another £200 for OEM

My understanding is that the BMW goodwill repair consists of a new floor (which is possibly the more resilient one from the convertible?), and an optional resin injection on the more stressed nearside

However, this wasn't available to me as there were absolutely no cracks found in my car, so instead I wanted to find a specialist who had good experience in this area and would be able to prevent the issue occuring down the line (I think it's several €000 to get a new floor fitted in an E46), and the two specialists that popped up were MProve and Reditch. As MProve had a recommendation through CSL circles, and I was passing by there on the way down to Munich, that's who I went for

TBH, I'm surprised someone over here hasn't started doing this work, as there are still a good few higher-powered E46s knocking about
 

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I would much prefer the repair plates than a new floor even if some cracks were found. There is no way a new floor could be fitted as well as its done in the factory. Access to a lot of the factory weld areas would be impossible due to the fact that its a complete car unlike in the factory where you would be starting with just the floor pan. Second thing is rust prevention. The car would have been dipped in the factory There is no way to replicate this. You can inject cavity wax but it will not be nearly as effective as dipping and its very hard to protect between the skins. Especially on a car like a csl you don't want to see rust staring to appear after 5 years in all the double seams
 

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Ya the BMW North america repair method is based on repairing or removing the rear floor and replacing ti whilst also reinforcing the left rear mounting point with epoxy structural foam to reduce the flex in this area.

Ya I hear ya about the need for someone over here,
I suppose the turner motorsport reinforcement plate kits is fairly DIY which I have purchased at the moment. I also have a full set of poly bushes purchased also.

Its just a matter of getting the time to do this project. Only got the M54b30 with the ESS TS2 supercharger back on the road after engine failure so im trying to enjoy the driving before the tax runs up then its off the road for a few months :D:D:D (kinda) before retaxing and placing back on the road fully reinforced.


I think the main problem with the new rear floor DaveG is that it merely brings the car back to its original state which doesnt essentially stop the problem from reoccuring!

£1000 LEINS is not too bad and I may consider going over to get this done provided I can get an ok price on just labour as I have all the parts.
Cheers for the info!
 

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£1000 is over double what people charger here. Does look like a good job though!
Of course Dave you can always get things done cheaper but to do this properly no way will it be 500 euro. I'd say 2 days work to start. Remove complete rear suspension,fuel tank. Clean the whole area. Grind all the areas for the plates. Drill any cracks and weld them and then grind flush. Weld through primer on everythink and weld on all the plates. Etch prime everything. Seam seal everything Factory colour stone chip on whole area. Cavity wax. Reinstall fuel tank and complete subframe. Reconnect brake lines and handbrake cables. Propshaft etc. flush through brakes. 4 wheel align the car.
Just add up the price of the reinforcement kit,and all the primers etc. I'm sure the epoxy is fairly expensive also.
 

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Don't know but I've seen jobs been done for 600 and seems perfect to me. Granted, these were fitting the plates and not having to repair cracks.


What's annoying though is fellas even still complaining about even 500 euro in labour to do the job being too expensive :mad: :rolleyes:

Let their cars fall apart and rot me thinks :smile:
 

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Don't know but I've seen jobs been done for 600 and seems perfect to me. Granted, these were fitting the plates and not having to repair cracks.


What's annoying though is fellas even still complaining about even 500 euro in labour to do the job being too expensive :mad: :rolleyes:

Let their cars fall apart and rot me thinks :smile:
Ya thats ridiculous. I suppose with lads that have e46's worth only 3G's it seems alot and that is where the complaint lies. But seeing as I have spent over 15G's on the car and closer to 20. I think that 1000 euro labour is very very good considering the job at hand.

All the parts that need to be removed along with the prep required, not including all the welding and rust prevention spraying as well as epoxy foam.
Worth every penny in my opinion and it is why I will be sorting my car out very soon.

Having m3 power in a standard e46 I have sleepless nights regarding my subframe haha...
 

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Indeed, I know exactly why its well worth it in your circumstances given the kind of car in question.

I didn't mean to come across as saying it was too much to pay as its a coont of a job to do as there's so many parts to remove but more so, there wasn't need for everybody going across to the UK and spending almost 2000 on the job by the time you factor in the cost of the repair and travel expenses etc when there's a few places here like motor confidence etc that would do just as good a job.
 
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