john-e89 said:
Just to go to LSD’s for a moment, I’m curious to your previous comment on this thread that you don’t think one is needed for the road, my 365bhp 35i torque steers form the rear and the rear brakes grab on long bends especially in the wet. You know vastly more than I do on theses cars so I’d be interested in your opinion if you didn’t mind. I’ve got some KWV3’s en route as we speak, maybe they’ll be enough with the M3 front arms and H&R anti roll bar...?
I asked a couple of guys who use their Z4s for heavy track work what I should change and they both said unless you're going to take it on a track most suspension mods will just make it more uncomfortable.
The only real change I have that would alter the handling is the wheels and tyres. I wanted more grip and less unsprung weight so went with MPS4S tyres on BMW 437M wheels. The 275 rears made a huge improvement in grip over the stock 255 width. I think 18" wheels would be even better but I couldn't find a forged set of 18" wheels that would fit for reasonable money.
If your car is pulling to one side under power then I would assume there's a problem with the rear suspension. I'd figure that out before changing parts.
The ARB will just make the ride worse and the handling more skitty on poor surfaces, probably a good mod for track stuff but a mistake on a road car. I've made the mistake of "upgrading" suspension on cars before and always ended up with something more harsh.
I think the 35i comes pretty well set up from the factory provided you get rid of the runflats. I also own an E92 335i that comes with exactly the same transmission and engine as my Z4 and it doesn't get close to how the Z4 handles. The E92 is considered a decent handling car and the Z4 is often criticized but I think a lot of that is because people compare the 3 series to more normal cars where the Z4 gets compared to hugely more expensive sports cars.
