Toyota1968":3vwpalz2 said:
The problem with a viscous is that no matter what fluid it is, you are relying on the viscosity of the fluid for the drive, so if you are rallying like we are, and really stressing the drive train, VC's are next to useless. You will always, no matter what have some kind of slip to the rear, it just varies from a bit, to quite a lot. They also take time to lock up, and as they get hot the performance diminishes, and eventually the oil burns up and doesnt work as well any more.
I locked my centre, and immediately I was a LOT quicker on my stage times, the car felt more balanced and easier to control, more predictable and consistent. You just have to be aggressive with it and its all good.
I even drive on tarmac with the locked centre and its fine, just no HB turns, but really who cares, look at the footage of the Quattros and 205 Pugs back in the Group B days, they weren't exactly slow, but they had locked centres..
Although I can't do handbrake turns, it doesn't worry me, because the loss there is not as much as the VC slipping.
Look back to the Group A ST165, they so obviously ran locked centres, they never did handbrake turns, and the general handing and attitude of the car suggests locked.
It wasn't until the St185 you could see they were running a more sophisticated centre system.
In my experience and opinion, for race and rally, a VC is a waste of time.
BUT, as there are extremely limited options (haha excuse the pun), one has to do what one can do.....
