So while I'm waiting for the test date the car bug has bit me again so I'm in the middle of a little upgrade project "off" the car. I managed to acquire a rather cheap ashcroft LSD Torsen type differential. Made a cheeky offer on ebay which was accepted.
http://www.mx5nutz.com/forum/index.php?showtopic=102482
I did not really know what I'd let myself in for and I've had a rather steep learning curve and had to buy some new tools to do the job but I had a late mk1 1.8 differential in the shed so I've started stripping it down to clean, paint and replace all the seals. I will be replacing the the side differential bearings but leaving the pinion shaft bearings alone and just replacing the crush tube so I can setup the drag torque once the nose seal is replaced.
I know I could of bought a second hand mx5 Torsen diff off ebay but where's the fun in that and the diff was so cheap it was rude not to buy it.
Here'a a very useful video I found on youtube.
http://youtu.be/dAqAqODmcj4