911 GT2 tyre wear
Discussion
hi all,
I purchased a 911 GT2, reg April 03, approx 3 weeks ago. Since then I have completed appox 1200 miles.
In this time I have driven the car only on public roads. Whilst I would say that my driving has been progressive I don't think it has been excessive. (it is a GT2 after all)
On friday I had a blow out! I was mystified. It turns out that the rear tyres are pretty spent having had (recorded by porsche) 5mm and 6mm on the rear.
The inside of the tyre wore through to the fabric, hence the blow-out. There appears to be tyre particles all over the underneath and rear arches and they are using this to attribute my driving to that of a trackday etc...or "very very aggressive driving". They are at this stage even refusing to carry out a geometry check on the rear of the car (although it is still within manufact. warranty!! OK...fair enough...I was hard on tyres but would expect at the minimum a geometry check and also a contribution, should that check throw anything up....towards the rear tyres.
any tips....or prev GT2 experiences?
I purchased a 911 GT2, reg April 03, approx 3 weeks ago. Since then I have completed appox 1200 miles.
In this time I have driven the car only on public roads. Whilst I would say that my driving has been progressive I don't think it has been excessive. (it is a GT2 after all)
On friday I had a blow out! I was mystified. It turns out that the rear tyres are pretty spent having had (recorded by porsche) 5mm and 6mm on the rear.
The inside of the tyre wore through to the fabric, hence the blow-out. There appears to be tyre particles all over the underneath and rear arches and they are using this to attribute my driving to that of a trackday etc...or "very very aggressive driving". They are at this stage even refusing to carry out a geometry check on the rear of the car (although it is still within manufact. warranty!! OK...fair enough...I was hard on tyres but would expect at the minimum a geometry check and also a contribution, should that check throw anything up....towards the rear tyres.
any tips....or prev GT2 experiences?
the problem that I have is that when they sold it to me they recorded 5mm on one side, 6mm on the other. They also are supposed to carry out geometry checks on their used cars.
They are saying that in order to chew through in that milleage I wouldn't have been able to keep the car on the road.
I'm saying....do the checks!!!! then come back to me and tell me their isn't a problem!!
If there isn't an issue (that would surprise me) then not an issue....I'll put new tyres and monitor the wear. If there is an issue then shut up and sort it and while ur there new tyres please!
They are saying that in order to chew through in that milleage I wouldn't have been able to keep the car on the road.
I'm saying....do the checks!!!! then come back to me and tell me their isn't a problem!!
If there isn't an issue (that would surprise me) then not an issue....I'll put new tyres and monitor the wear. If there is an issue then shut up and sort it and while ur there new tyres please!
The inside of the rear tyres do wear quicker than the outside. That is part of the geometry set up.
However the allegation of the excess wear being down to hooning around trackdays is totally wrong. If you were doing lots of on track high speed cornering, the outsides of the tyre would be taking the stresses and thus the wear. Not the inside edges.
Stick to your guns and get the geometry check.
DAZ
(normally get between 6 and 8k miles out of rear tyres).
>> Edited by dazren on Tuesday 22 March 12:03
However the allegation of the excess wear being down to hooning around trackdays is totally wrong. If you were doing lots of on track high speed cornering, the outsides of the tyre would be taking the stresses and thus the wear. Not the inside edges.
Stick to your guns and get the geometry check.
DAZ
(normally get between 6 and 8k miles out of rear tyres).
>> Edited by dazren on Tuesday 22 March 12:03
ok.....porsche have now agreed to do a geometry check, but need me to authorise the ordering of new tyres.... it needs these to check the geometry.
If the geometry is ok....I guess I'll have to whistle....but I'll still be very puzzled why nearly new tyres have been eaten in 1200 miles.
If the geometry isn't correct I'll have to go into battle all over again.
I'll also make it clear that I am trusting them to be honest about the state of the allignment. Also that I want to see a copy of the report that was done in dec 04.
If the geometry is ok....I guess I'll have to whistle....but I'll still be very puzzled why nearly new tyres have been eaten in 1200 miles.
If the geometry isn't correct I'll have to go into battle all over again.
I'll also make it clear that I am trusting them to be honest about the state of the allignment. Also that I want to see a copy of the report that was done in dec 04.
You are certainly putting a lot of trust in the garage letting them check the geometry and being honest !
In terms of tyre wear it is quite correct that providing the camber angles are set correctly you wouldn`t particularly kill the inside edge of the tyre, in fact with excessive camber you are more likely to wear out the inside edge of the tyre by driving too slowly ! I have seen just that happen on a track based GT2 set up for Stephan Ortelli but driven by Joe Normal. Only the inner inch of the tyre was getting any heat/wear on it !
You don`t comment on the rest of the tyre, is it pretty worn right accross the tyre but just happens to have gone through on the inside edge or is the rest of the tyre still 4-5mm on the outer edge ? If the former then I`m afraid it`s probably your driving, if the latter more likely the geometry.
Looking at the tread block on the tyre a heavily used (ie tracked) tyre will tend to show "roll over" on the tread blocks. A road driven car will not tend to show that.
The tyre debris you talk of sounds a little strange. On track you pick up tyre "marbles" but on the road you wouldn`t. Obviously if the tyre blew out then there will be some debris but other than that it sounds as though something is/was rubbing on it.
I suspect you will end up having the geometry set up F.O.C and pay for a set of tyres. You may never get to the bottom of the cause. At the end of the day only you know how hard you drive the car.
Henry
In terms of tyre wear it is quite correct that providing the camber angles are set correctly you wouldn`t particularly kill the inside edge of the tyre, in fact with excessive camber you are more likely to wear out the inside edge of the tyre by driving too slowly ! I have seen just that happen on a track based GT2 set up for Stephan Ortelli but driven by Joe Normal. Only the inner inch of the tyre was getting any heat/wear on it !
You don`t comment on the rest of the tyre, is it pretty worn right accross the tyre but just happens to have gone through on the inside edge or is the rest of the tyre still 4-5mm on the outer edge ? If the former then I`m afraid it`s probably your driving, if the latter more likely the geometry.
Looking at the tread block on the tyre a heavily used (ie tracked) tyre will tend to show "roll over" on the tread blocks. A road driven car will not tend to show that.
The tyre debris you talk of sounds a little strange. On track you pick up tyre "marbles" but on the road you wouldn`t. Obviously if the tyre blew out then there will be some debris but other than that it sounds as though something is/was rubbing on it.
I suspect you will end up having the geometry set up F.O.C and pay for a set of tyres. You may never get to the bottom of the cause. At the end of the day only you know how hard you drive the car.
Henry
911Dan,
This sounds all a bit familiar...
I was at a track day at Dijon last july, where a red GT2 had exactly this same excessive inside rear tyre wear problem.
IIRC the problem was that the rear tyres where rubbing on the rear suspension under extreme load.
The GT2 owners name was Richard Koenig (or something like that) car plate is KOE 9 (I think). I've seen him at loads of track days so perhaps someone else knows him or has a contact for him? He might be able to shed some light on the problem. I think his car was supplied by the OPC in Nottingham perhaps they could help?
This sounds all a bit familiar...
I was at a track day at Dijon last july, where a red GT2 had exactly this same excessive inside rear tyre wear problem.
IIRC the problem was that the rear tyres where rubbing on the rear suspension under extreme load.
The GT2 owners name was Richard Koenig (or something like that) car plate is KOE 9 (I think). I've seen him at loads of track days so perhaps someone else knows him or has a contact for him? He might be able to shed some light on the problem. I think his car was supplied by the OPC in Nottingham perhaps they could help?
the tire is pretty worn all the way across. The tread on the outside was just over a mm.....on both sides....with it very slick on the insides.
I just have problems believing that you can chew through a tyre with 5-6 mm of tread in 1200 miles!!
ur right on the geometry check...and the tyres. I've agreed to pay for the tyres with the understanding that if the geometry check shows anything then we're back to a conversation on tyres.
I had a C4S that I drove very positively and it was fantastic on tyre wear. (having 4wd and traction control) If I'm going to have to pussy foot about in order to get 5k miles out of the tyres, and end up driving more slowly that the C4S, the whole experience sounds like a real pain in the rear. It's a GT2....!!!
I just have problems believing that you can chew through a tyre with 5-6 mm of tread in 1200 miles!!
ur right on the geometry check...and the tyres. I've agreed to pay for the tyres with the understanding that if the geometry check shows anything then we're back to a conversation on tyres.
I had a C4S that I drove very positively and it was fantastic on tyre wear. (having 4wd and traction control) If I'm going to have to pussy foot about in order to get 5k miles out of the tyres, and end up driving more slowly that the C4S, the whole experience sounds like a real pain in the rear. It's a GT2....!!!
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