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Posted

When reversing on full lock (left or right) my rear wheels skid and grind on the tarmac, hard to describe but almost like the rear wheel locks up then instantly frees itself, if it was fronts I would have thought something like this would be caused by rubber brake lines failing but rears are hard piped, if I full lock left, the left wheel skids and full lock right, you guessed it, right wheel skids. Diff looks almost brand new (probably reconditioned but unsure what would cause this 

Posted

Has somebody welded the diff up for drifting? My son has a BMW drift car & depending on which tyre has the best grip the other wheel skips if on tight lock

Posted (edited)

I believe this is quite common and is about Ackerman geometry that a car uses to go round corners. I don't understand the tech stuff but Wikipedia says this:

Modern cars do not use pure Ackermann steering, partly because it ignores important dynamic and compliant effects, but the principle is sound for low-speed manoeuvres. Some race cars use reverse Ackermann geometry to compensate for the large difference in slip angle between the inner and outer front tyres while cornering at high speed. The use of such geometry helps reduce tyre temperatures during high-speed cornering but compromises performance in low-speed maneuvers.

On other forums, someone said a wheel alignment fixed it for them? Also:

THIS is why our tires shuffle sideways in low speed parking maneuvers. The colder or more worn the tire the more noticeable it is because there is less compliance in the tread. 

Check age/state of tyres?

Edited by nelmo
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Posted

Interesting thanks guys, I tried the full lock engine off and push trick (I know this works to see if diff is welded) but that trick works on normal cars, and I wondered if it would be the same concept with a car that's half the size, but it's extremely difficult to push on full lock, infact it takes 2 people, but they could just be because I'm unfit 🤣🤣

Posted

Easiest way to check if you have an open, limited slip or "locked" diff is to jack up one back wheel with the gearbox in neutral & handbrake off.  If you can turn the wheel  it is an open diff, if not it's a limited slip (or otherwise locked) diff.

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