E39 M5 - LSD and tyre depths
Discussion
I need to replace one of my rear tyres (goodyear eagle f1) on the back of my E39 M5, yet the tyre on the opposite side will have 5mm left on it. The new tyre will have 8mm depth and therefore will roll slightly further. I know that audi four wheel drive systems need all tyres to be run at similar tyre depths and therefore it is important to replace the set.
Whats the opinion on running different tyre depths on the back of M5 especially given that it has an LSD?
I don't really what to replace both rear tyres as the fronts are running low and I want to leave the option open to change brands across all 4 wheels. However I don't want to place stress on the lsd.
Whats the opinion on running different tyre depths on the back of M5 especially given that it has an LSD?
I don't really what to replace both rear tyres as the fronts are running low and I want to leave the option open to change brands across all 4 wheels. However I don't want to place stress on the lsd.
My personal view is that on performance cars you should always change the axle pair, regardless of cost. It's your life at the end of the day though.
You'll also find the car will throw "Tyre Defect" through the OBD at every opportunity which will mean the bong going off virtually every time you go out.
You'll also find the car will throw "Tyre Defect" through the OBD at every opportunity which will mean the bong going off virtually every time you go out.
Neil.D said:
Cars with LSD's need to replaced in pairs, or at the very least with another tyre within 2mm of the other. Any more and you risk 'diff wind up'
Either get a new pair, I found some good deals on etyre, or find a part worn one on ebay.
Thanks for the replies. They confirm my concerns and therefore I will try and get a second hand tyre off ebay with similar wear for now or buy two.Either get a new pair, I found some good deals on etyre, or find a part worn one on ebay.
Cheers
Carl
Spoke to the workshop controller in the local BMW garage. He confirmed that the LSD is controlled by oil pressure and locks when high torque levels are transfered down it. Therefore under normal driving the diff will not wind up as it is open anyway. Under harder driving it will wind up, but given that the forces under harder driving will naturally be much more brutal that a 1% variance in rolling distance across the axle I think I can live with it!
You shouldn't have any problems with OBC bonging at you either.
I had a puncture in one of my fronts last year and at short notice could only get 1 (it was a big gash that the tyre sealant couldn't deal with) and never got bonged at once despite the other front being down to about 3mm.
I had a puncture in one of my fronts last year and at short notice could only get 1 (it was a big gash that the tyre sealant couldn't deal with) and never got bonged at once despite the other front being down to about 3mm.
If it's for the nearside rear - put a new one on, then do a couple of laps sideways around a roundabout - that'll even them out!
Or,
If you do get a pair, i picked up a couple of Falkens for 130 pounds each a couple of months back. spent ages reading reviews before and they were highly rated. I can confirm they perform well and seem to be lasting well despite some "enthusiastic" driving. go for 285 wide though, rather than the standard 275.
Or,
If you do get a pair, i picked up a couple of Falkens for 130 pounds each a couple of months back. spent ages reading reviews before and they were highly rated. I can confirm they perform well and seem to be lasting well despite some "enthusiastic" driving. go for 285 wide though, rather than the standard 275.
Edited by rswheelnut on Friday 8th May 23:46
rswheelnut said:
If it's for the nearside rear - put a new one on, then do a couple of laps sideways around a roundabout - that'll even them out!
Or,
If you do get a pair, i picked up a couple of Falkens for 130 pounds each a couple of months back. spent ages reading reviews before and they were highly rated. I can confirm they perform well and seem to be lasting well despite some "enthusiastic" driving. go for 285 wide though, rather than the standard 275.
Alright Rich? Or,
If you do get a pair, i picked up a couple of Falkens for 130 pounds each a couple of months back. spent ages reading reviews before and they were highly rated. I can confirm they perform well and seem to be lasting well despite some "enthusiastic" driving. go for 285 wide though, rather than the standard 275.
Edited by rswheelnut on Friday 8th May 23:46
What do you see the benfit of going 10mm wider? Trying to compete with Pete and his 315 section Viper tyres?
Neil.D said:
rswheelnut said:
If it's for the nearside rear - put a new one on, then do a couple of laps sideways around a roundabout - that'll even them out!
Or,
If you do get a pair, i picked up a couple of Falkens for 130 pounds each a couple of months back. spent ages reading reviews before and they were highly rated. I can confirm they perform well and seem to be lasting well despite some "enthusiastic" driving. go for 285 wide though, rather than the standard 275.
Alright Rich? Or,
If you do get a pair, i picked up a couple of Falkens for 130 pounds each a couple of months back. spent ages reading reviews before and they were highly rated. I can confirm they perform well and seem to be lasting well despite some "enthusiastic" driving. go for 285 wide though, rather than the standard 275.
Edited by rswheelnut on Friday 8th May 23:46
What do you see the benfit of going 10mm wider? Trying to compete with Pete and his 315 section Viper tyres?
After reading lots of reviews, it was recommended to do so for the Falkens due to their shape. Gives more protection to the rim. I guess they dont look as wide as they actually are, and I've had no problems in terms of fouling arches or anything. You'd never notice the difference to be honest over the normal 275's. They seem to offer good grip, look decent and are lasting pretty well too so I'm happy with them. A good tyre for budget tyre price.
Hope you're going ok. I've been a bit reclused with a hectic life at the moment. Have a baby due in a couple of weeks so lots of preparation for that.
You done anything with your exhaust yet? I'm going to get my done by the company at the end of my road who can fabricate one. Will let you know how i go...!
Edited by rswheelnut on Wednesday 13th May 17:29
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