Quote:
Originally posted by svx_commuter
This may be the early signs of the RWD failing. This happened to me and it was a bad transfer valve solenoid assy. Be careful as there may be times when the car will pull/steer you off the road. It was rather quick, the involuntary steering that is, for me.
You also damage the front dif when the RWD is not working.
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Gid’ay John, I have seen you say this a few times before, and have not seen the point. Though reading all the talk about the amount of torque steer, that you blokes all seem to have, got me thinking.
I think I have got the picture now. As you know the type of AWD that we have is different and does not have these traits, of torque steer, understeer. It does not happen, with our model.
In a front wheel drive car, and I suppose the FWD SVX would be the same, the front wheels are controlled to prevent wheel spin. The TCU detects the wheel starting to spin and sends the torque control signal to the engine, to turn down the power, till the wheel stops spinning. This is to prevent the type of torque steer that you are talking about. Trevor’s description of the sideways accelerating Mini Minor, is what it was like, before this type of control was used.
I think what is going on in the US model is, as a number of people have said, is the transfer clutch not working. In this case when clutch does not drive the back wheels, for the usual reasons. The front wheels start to spin, when this happens the TCU does not turn the power down, it just applies the transfer clutch, to move some of the torque to the back wheels. Then as far as the TCU is concerned if the front wheels are still spinning, than all the wheels are spinning, we know this condition is allowed to happen, eg in snow etc.
So if the US model experiences this severe torque steer problem, then the transfer clutch is not working, as it would not be possible to spin the front wheels, under normal AWD conditions. It would be the same if the FWD fuse were inserted.
So the front diff WILL, have an unusual amount of torque shock loading under these conditions, that could cause damage to it. Thinking back, there have been a number of Front diff failures, maybe this has been the cause?????
Funny how these things all come together in the end, to show the cause.
Harvey.
