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Originally Posted by dinan540
So I was looking in the classified adds and found a Dinan M5 3.45:1 differential for $950.
My 540i does not have a LSD and I am interested in having this upgrades.
The stock ratio on my 540 is 2.81:1.
Questions:
1. Would this Dinan M5 differential work for my 540i without much fussing?
2. What are the advantages of having LSD?
3. Is this price high? I am assuming it is used, but not sure.
4. What are the benefits of changing the gear ratio?
Thanks in advance,
Paul
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1. Dont know
2. An LSD maintains power to both wheels despite which wheel has more traction through a corner and even in a straight line. For example if you peel out right nwo one wheel will spin and one will gain traction. With a LSD both wheels will have power and spin.
3. price seems fair for a e39 diff.
4. Faster acceleration. Quicker shifting required.
The disadvantages are you will be cruisign at higher rpms with the shorter gearign per mph. So that means if you cruise on the freewa at 80 mp at 2700 rpms now, you could be cruisign at 80 mph on the freeway with the shorter gears at maybe 3300 rpms. This is turn means slightly more gas consumption. 3.46 seems reasonable since you do have a 6 speed.
6 speed e46 m3s use a 3.46 lsd aswell I believe.
$7000 is really steep for a diff. You could get a custom one made for your car for like 4500.