Scrap at 49,000 kms

[Jeeper6]

I use this one...the "tire size comparison" tab compares tyres for all dimensions...

https://tiresize.com/comparison/

[Colm]

Originally Posted by Trailfirst

Sorry but the worn tyre thing is basically crap IMO - there will be FAR greater variations in rotational speeds caused by fairly small differences in tyre pressures - as well as caused by travelling anything other than absolutely dead straight line etc.

I have too say, I 100% agree with this Guy.
That problem of drive trains getting bound-up and busting them selves was solved a couple of hundered years ago with the invention of the differential.
To say that differently worn tyres would cause a driveline to shit itself is absurd.
That would mean that every time a wheel spins, a car travels around a roundabout or a bend, or get bogged without lockers, then its game over.

So until I blow the drive train out of my GC, I call bullshit on this.
Thats my 2 cents

[2bad4u]

Originally Posted by Colm

So until I blow the drive train out of my GC, I call bullshit on this.

Haha. Say it like it is…… but I agree.

It’s AWD not 4x4, so we’re not driving around with the centre diff locked and cooking transfer cases Anything but dead straight and you wheels are turning at different speeds.

Would I put different sized tyres on? No. But am I worried about a few mm/psi difference? Absolutely not!

[drover]

Oh well each to their own, I also don't think a few mm or psi will change things other than adhesion to road surface but a larger variation will mean the data from the speed sensor on each wheel can cause conflict with things like ABS, Skid control and such, slippery plates in the TC seem to get a flogging but I very much doubt diffs would though LSD's don't like it over the long time, not sure about ELSD...... Running different types of tyres is another thing entirely more than sensors having a problem then.

[Jeeper6]

Originally Posted by drover

Oh well each to their own, I also don't think a few mm or psi will change things other than adhesion to road surface but a larger variation will mean the data from the speed sensor on each wheel can cause conflict with things like ABS, Skid control and such, slippery plates in the TC seem to get a flogging but I very much doubt diffs would though LSD's don't like it over the long time, not sure about ELSD...... Running different types of tyres is another thing entirely more than sensors having a problem then.

Spot on Drover...the ABS and traction control systems rely on data collected at the wheels through sensors...that all are rotating at the same speed.

If the sensors send information to the ECU that one wheel is rotating faster than the opposite the system is programmed to act accordingly. If a wheel is sensed to be spinning faster then the one opposite the traction control system will attempt to slow the offending wheel.

Then there is the ESC, Electronic Stability Control, that uses the ABS sensors to sense when wheels are rotating at differing speeds possibly in a skid and actuates the brakes or backs off throttle to stabilise the vehicle.

At what differential in speed it actually triggers the system to act who knows as that sort of data isn't readily available....needless to say it works.

Back in my WJ Overland it had "Varilok" LSD's front and rear, the rear one would growl when moving around in car parks as one wheel was turning faster than the other and it would begin to engage the clutches. There were no electronics in that. ( sticking lots of LSD additive would stop it, but would also slow the locking effect)

The WH Overland had ELSD's front and rear, and it relied on info from the ABS sensors to activate the lockers if they sensed one wheel rotating faster then the opposite. It used the steering wheel input and yaw sensors to know when the Jeep was cornering thereby not activating the ELSD's.

This poverty pack Laredo I have uses the ABS sensors too, to activate the traction control system if it senses one wheel rotating faster than the other. This Jeep also uses the yaw sensor and steering input to know when the Jeep is cornering so the traction control system doesn't activate while turning in car parks and sharp corners.

[drover]

The WG's rear diff certainly let you know if odd size tyres got fitted.......... recall a fella on here having some drama and turned out new tyres on front but old ones on back until next pay sort of thing and all manner of growling..... my poverty pack just gave the odd clack on sharpish slow, tigt turns.
WK2 if a speed sensor fails all those goodies shut down but at least you can still drive, lots of bells and messages but you have to drive your self as the car is dumb, no FWD either......... So when fiddling with the shocks and stuff make sure its out of the way so you don't stand on it.