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Differential wear...

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Shugster

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OK here's a rather technical question....

If I fit a worn tyre on one side and a brand new tyre on the other on the rear axle, (think back to the old rear wheel drive days), I have two slightly different diameters.

Therefore the rpm will be slightly different between the two wheels and the differential will be working constantly even in a straight line.

The difference will be next to nowt, but there will be a difference.

So theoretically the differential will wear out quicker.

The only reason I ask this is that the Germans make a big deal out of fitting a brand new and a part worn wheel on the same axle.

Does anyone have any views / experience on this?
:PDT_Xtremez_43:
 
I've got Dynamic Stability Traction Control (DSTC) and Anti-lock brakes (ABS) on my Volvo XC70. The onboard computer checks for any difference in wheel speeds. If it thinks the car is losing traction or skidding it will apply drive or braking as appropriate. I can vouch for this after hitting a deep puddle on a country lane in the middle of the night. Wow! Of course the way to simulate this to the computer is to put a worn tyre on against a new one. The downside is that I have to have all four corners changed at the same time. But the upside is that they wear fairly evenly anyway.
 
I think it may be negligable.The limited slip diff should take care of it, as if you were going around a corner. I may be wrong with this, and others are welcome to correct me.
There is a problem with some 2 wheel drive vehicles which have a 4x4 capability, eg my frontera which is normally rear wheel drive but selectable 4x4.
If you drive such vehicle on a hardened surface in 4x4 mode, and turn a corner, you can get what is known as axle wind up. The axle literally twists and will not unwind.
You can destroy the drive shafts with it.

With this type of vehicle, you should only use 4x4 mode on snow, ice or lose surfaces.

I don't think that you have a problem. It sounds more like the tyre company's trying to sell you an extra tyre.
There again, what do the Germins know about building cars????

Before anyone kicks off.....................I also have a 6 month old VW.:PDT_Xtremez_31:
 
Shugster said:
OK here's a rather technical question....

If I fit a worn tyre on one side and a brand new tyre on the other on the rear axle, (think back to the old rear wheel drive days), I have two slightly different diameters.

Therefore the rpm will be slightly different between the two wheels and the differential will be working constantly even in a straight line.

The difference will be next to nowt, but there will be a difference.

So theoretically the differential will wear out quicker.

The only reason I ask this is that the Germans make a big deal out of fitting a brand new and a part worn wheel on the same axle.

Does anyone have any views / experience on this?
:PDT_Xtremez_43:
Click to expand...

Not any views, but certainly have experience of this. I was forced to change my tyres.

That reminds me, my TÜV is due soon.

Off Topic Great day today. Weather was fantastic and it was lovely down on Stamberger See (Great view of the Alps)
 
T93 said:
Not any views, but certainly have experience of this. I was forced to change my tyres.

That reminds me, my TÜV is due soon.

Off Topic Great day today. Weather was fantastic and it was lovely down on Stamberger See (Great view of the Alps)
Click to expand...

So it is a legal requirement here then?

Off Topic Yes it was a cracking day, in fact the whole week has been bl00dy good with blue skies, and it's set to continue into next week.:PDT_Xtremez_19: Off Topic
 
Shugster said:
So it is a legal requirement here then?

Off Topic Yes it was a cracking day, in fact the whole week has been bl00dy good with blue skies, and it's set to continue into next week.:PDT_Xtremez_19: Off Topic
Click to expand...

Not sure if its a legal requirement. I know the just the man to ask though. I will call him now, see what he says.

My car is German (cannot knock the Germans for building quality cars) However mine is RHD and the windscreen wipers have just packed in for some reason...now the crux is that the wiper arms (or whatever they are called) are in reverse to LHD cars oooooer.
 
Some cars are really sensitive to it, some could not give a toss.

Basically it depends on the type of diff fitted.

I have run a 225 on one side and a 235 on the other on my Evo (not something I would normally do but I had a particularly good fun day on track and smoked more tyres than I thought I would) Drove it home with no issues but I know that the old Cavalier Turbo would wind up a diff in just a few miles with just a mill or so of tread difference.
 
Weebl said:
Some cars are really sensitive to it, some could not give a toss.

Basically it depends on the type of diff fitted.

I have run a 225 on one side and a 235 on the other on my Evo (not something I would normally do but I had a particularly good fun day on track and smoked more tyres than I thought I would) Drove it home with no issues but I know that the old Cavalier Turbo would wind up a diff in just a few miles with just a mill or so of tread difference.
Click to expand...

Well I have a very finely un-tuned 1400 Nissan almera that's over 10 years old.

It's fwd, so if I keep the mis-match to the rear, (undriven), wheels then everything should be cool and the gang, no?
 
If it is across an undriven axle and the only difference is a few mill of wear I cannot see what harm would be caused?
 
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