View Single Post
Old 04-12-2013, 11:39 AM   #50
m3dragon
Events Guy
 
Join Date: May 2009
Location: Sacramento
Posts: 118
Car is back after being gone for the weekend. So here is the latest and greatest.

Got the car smogged for the last time WOOTTT. As you can see I am cleaner than a prius… 4 cats can do that HAHA. Anyone needs a test section I will loan it out for $30 bucks.





After I got the car smogged I took it straight over to the fabrication shop to have the rear sub frame done as well as have the diff upgraded to 3.91 gears. Trying to time work when things can be done together. My car had started to show signs of spider cracks on both sides. The frame had not "completely cracked" but if I had not done the reinforce kit it would have eventually done so. Here is some images of the car at the fabrication shop.











From what I have found and what the shop believes as well is the reason the frames are cracking is fatigue failures. Same issue with aircraft hulls and the pressure changes. The metal eventually begins to fracture with the constant pressurization and un-pressurization.

The fatigue part in our cars is the loading and unloading going around turns. This constant flexing causes the area to fail. Bad job by BMW not to beef this up for that is the reason for the cracks. Stiffer suspension only acerbates the issue faster. As the car has 59000 hard miles on it from back roads driving and being on CA roads I guess I am not surprised to know I would potently have the issue.

Last of the recent changes is the 3.91 gears upgrade. Already I can feel a change in the car and I don’t even have them broken in. I t made sense to do the diff work now as I had the sub frame out. Pics are of the old 3.61 stock gears.

m3dragon is offline   Reply With Quote