I went rallying on the weekend, unfortunately I drove like an old woman, but it did give me the chance to really test out the spring loaded locker I made for my H165.

My unbiased opinion is that the one I made locks and unlocks so it does what it was designed to do.

Some interesting observations to come out of testing are: These things are designed to lock and unlock. Lock both rear axles when you stick your foot onto the throttle and unlock when you lift your foot off the throttle.
Feral, these things are a long way from a real LSD but in my opinion they serve a purpose. The one in my coupe has changed the way it turns into a corner because when the plates are unloaded the rear wheels can turn independently, meaning the car turns much easier once the throttle is lifted. Keep in mind that I am making these coments only in relation to how they perform compared to the poor handling characteristics of a welded centre.
Once you smack your foot back onto the throttle they act the same as a locker because both axles are locked.
Something that caught me by surprise was the way the car became more unstable when you first lift off the throttle, this is because the wheels become unlocked, it felt a bit like I had more rear brake bias and made it easier for me to set the car up when approaching a corner.(this characteristic was something that I liked).

I am not going to get into a big debate about "do these things work or not". All I can tell you is that in my opinion they have made my coupe more fun to drive in the dirt. I have not tested them under race conditions on the tarmac.

I did not think these things would work and I have to admit that I had the same opinion as Feral. After spending some testing time in the car I now believe that my original opinion was wrong.

I cant tell you that they work in huge horsepower or torque applications on the street or how long they last because thats not the application that suits my needs.

1200RC - the extra friction material shown in your link is an absolute waste of time. Surface area is too small for it to make any difference. I believe it would wear out fast then cause more problems than its worth because the PG clearances would change.

Paul.