Testing Viscous Coupling Unit

[Hippo]

My last chance,
I can't watch my VC seizing week after week i can't leave freebie to die.
Just ordered with my very last money an upgraded brand new, genuine TAG000230.
Ill let you know the results on the next week.

George

[ianann]

Hippo, are you replacing the VCU as well or do you feel it still has life.
I would be really interested in the overall slip with the old and new IRDs by jacking up one side of the car and turning the front wheel by hand (making sure the VCU doesnt slip) and counting the revolutions of front and back wheels (I got 118 front to 117 rear ---slip of 0.8%) with old style IRD and siezed VCU. Would expect much much lower figure with new IRD.
Lots of luck and I hope the venure pays off!!
Cheers
Ian Hughes

[Hippo]

Ian,
I repleaced VCU last May and its still alive after 25K Kms (rear wheel test sucessfull) but my current IRDs ratios causing the new VC to work overtime and gives me the feeling that it will seize permanently again!
On top of that the bearings inside IRD started to be noisy with the time.

Promise i will count the wheels revs of front to rear before and after replacing IRD. I'll let you know the results.

George

[Peterhotpies]

If Ian's ratio figures are correct (118 turns front versus 117 rear), a much cheaper option than a new IRD could be using partly worn tyres on the front. 5mm of tyre wear is about 1%, so to halve the amount of work the VC must do, you only need to have 2-3 mm more wear on the front. The same could be achieved with tyre pressures. Drop the front pressure until the front tyre travels (say) 0.05% less than the rear for the same number of turns. (Not sure how to measure this with the VC).
To know the correct amount of wear, it would be great to know the ratio of the new IRD's.
What do you think?
Peter