Hi, I'm trying to find out if my 2003 z4 roadster has a limited-slip differential. I also has an "04 325i and would like to find out as well. I want to change the diff oil and want to put the correct oil in. Thanks
Doubtful either has a LSD. If you can peek underneath you will see a metal tab hanging from the diff. S435 would mean a 3.45 LSD. I think an open diff will just have a number. http://media.photobucket.com/image/bmw diff tag/gizmo316i/Differential/SDC10824.jpg Other methods require jacking up the rear and spinning the tires. http://www.bimmerhaus.com/tech/diff.html
My 2006 Si does. Because I've changed the fluid in it. (I think) the Z3 does as well - there was an issue with the rear assembly being too heavy for the bolt of something as I recall which I've seen the fix for. I think if you look over on bimmeforums there's even a ratio listing of the hardtop v. roadster - the roadster is slightly lower b/c it's slightly heavier. The easiest way to figure out if the box in the middle is a diff on any car is to jack the rear of the car and see what happens when you turn the rear wheel - does the other one lock and begin to move? Not all factory cars are exactly the same, and unfortunately these blanket statements don't work. Especially now the cars are made all over the world. BMW is no longer 'the sausage factory'.
not sure if I read this correctly [perhaps you were referring to the e36/7 z3 (?)] but... regarding the e85/86 z4 generation: 1. only the Ms have the LSD 2. the 'vert is lighter than the coupe.
Missed the LSD part of the diff question... http://forums.bimmerforums.com/forum/showthread.php?t=876946&highlight=lsd For ratios, etc. If you're thinking about one have you considered the Quaife, instead?
