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Hi Gil, glad you are onboard with our Villages BMW Z car Club!I have a 1998 Z3 roadster with the 2.8L and 5 spd manual trans. I take it to SCCA Track Night in America events in Florida regularly. I am considering swapping out the open differential with 3.15 gears to 3.23 LSD from Diffsonline. What would you recommend?? car has 94k, regular care, updated suspension , bushings, exhaust, lightened fly wheel, powerstop Z26 ceramic brake kit and light 9×17″ Apex rims (yeah, the fronts clear the strut tower by 2-3 mm) with toyo Proxes RIR 235/40 all the way around. It’s fun on the street but delightful on the track after you get used to the over-steer.
Answer
Hello Mr. Brancato, sounds like a fun car. Why not go with a BMW limited slip differential? Some Z3s came with limited slip and an E30 limited slip is the same as the one in your car. I have an E30 and I just boight a good used limited slip differential for it. I think they would be the best option as it is a lot less labor as you are swapping the entire rear differential instead of replacing internals, otherwise I would go with a quality part such as a Quaife.
We may cross paths at one of the Track Night in America events or another track day, I race an E46 M3 that belongs to a couple of friends. Please let me know if you have any other questions. Thank you.
Gil Neves
Thank you kindly! Look for you along the way. Daytona may 5th scca Tnia.