Bigpower

In the e30 track thing we found that as it doesn

If it's a track whore for drifting only then weld the bugger

but if it's for track days of all sorts then get an LSD.

There are ways of drifting a car with an open diff too though - I managed it in an Omega Elite at Marham (wasn't my car I must add :oops:)

Shift lock helps - stick the box into 2nd at the apex, when you actually want the car to slide, then dump the clutch. This will temporarily lock up the rear wheels and start your car to slide.

Clutch-kick - Whilst flooring the throttle in a corner, and your car doesn't want to slide, temporarily depress your clutch and let the engine revs rise, then dump the clutch as if to wheelspin it while you're moving and turning the corner. The back end will step out all of a sudden so don't keep flooring it or you will 180 deg.

"Power slides" will be almost impossible as the wheel with the least grip (usually the inside rear) will just spin as you've found out already. If you want powerslides to happen then the LSD is the way to go.

HTH

Sorry just re-read this question

(note to self - not everyone wants to drift their car :oops: )

If you weld the diff then you will drift everywhere, even if you don't want to.

The way to go is decent suspension - stiffer springs and dampers, and an LSD. It makes a huge difference even if you get decent tyres - I've used Yokohama A048Rs and I added 20mph onto one certain corner at Marham a couple of years ago compared to standard road tyres.

Don't know anything about BMW diffs so I don't know what oil they use but make sure it's the correct stuff and make sure it's fairly fresh.