cracked subframe

[estoril]

You're better off with a 3rd party repair anyway as all BMW did was replace the cracked floor with another one and fill part of the void (not all of it) with resin. 2nd failures have been seen but are rare, also, the resin is flammable so another repair then becomes far more difficult. 3rd party repair with strengthening plates is (IMO) far better in the long run.

[MisterCorn]

Originally Posted by Calcifer

Such as?

Having owned a number of cars. I haven't experienced a major failure as this in the CSL EXCEPT for in my M Coupe. Also BMW!

If a car has been under dealer servicing and upkeep and everything was carried out on schedule by way of maintenance then surely something significant as this ought to be rectified by them.

How about bore scoring and IMS bearing failure in the Porsche M96 engine, Big end bearings wearing out in short order and throttle actuator failures in the V8 M3 engines, EGR issues on Range Rover diesels. These are just off the top of my head, I'm sure there are countless others. All affecting cars under 10 years old, all potentially very expensive, not covered by the manufacturer.

MC

[Chad]

Originally Posted by estoril

You're better off with a 3rd party repair anyway as all BMW did was replace the cracked floor with another one and fill part of the void (not all of it) with resin. 2nd failures have been seen but are rare, also, the resin is flammable so another repair then becomes far more difficult. 3rd party repair with strengthening plates is (IMO) far better in the long run.

Yes definitely do fail again after a new floor panel,as our other csl did as stated on another post, but to be Fair to BMW it's a fair size panel that's replaced inc other panels where required, I personally saw work that was done, practically take rear end out of car, not just a couple of lines of weld and a couple of plates, saying this second repair done by BMW on this car was only welded, will have to wait to see how that pans out.

[GregorFuk]

Get your car to Redish, they will fix it once and for all.

[Malcolm D]

Originally Posted by GregorFuk

Get your car to Redish, they will fix it once and for all.

Redish are not taking any bookings as they are fully booked out till November

[Chad]

Originally Posted by Malcolm D

Redish are not taking any bookings as they are fully booked out till November

Personally I don't see how a couple of plates welded over already damaged/cracked subframe panel,can be better than a full new thicker floor panel, personally trust BMW technology over a couple of aftermarket plates welded in, But anything is better than subframe dropping off.

[JBird]

I agree. Reddish seem like a good bunch, but welding plates over the top is bit mickey mouse. If the BMW resin injection is done to a high standard it should give a softer load distrubution and be better in theory. There is a reason why it is 2-3x more expensive than the plate method (other than usual BMW rip off rates).

[estoril]

Originally Posted by JBird

I agree. Reddish seem like a good bunch, but welding plates over the top is bit mickey mouse. If the BMW resin injection is done to a high standard it should give a softer load distrubution and be better in theory. There is a reason why it is 2-3x more expensive than the plate method (other than usual BMW rip off rates).

The resin is done as well as the plates, or at least it was in my case, and across the entire floor. BMW only do the resin on the weak side unless you push them to do both.

[JBird]

Originally Posted by estoril

BMW only do the resin on the weak side unless you push them to do both.

You got me worried for a second, but looks like they did both.

[select]

When i had mine done by a shop who specializes in this repair (pretty much like redish) they advised the following. They also have patented their plates so im guessing they know their stuff.

Mine had a small crack on the right hand side which "they all have" they welded the plates on and they advised to replace the subframe bushings with stiffer ones, because according to them, the rear axle transfers the force onto the subframe but the rubber bushings designed to damp the force is too soft which allows the subframe to flex which it wasn't built for and therefore starts to crack.

FYI that is the same that BMW did on the e92 M3 GTS, the used solid subframe bushings instead of rubber ones. And the M4 doesn't have subframe bushings at all, as far as i know.