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High Speed Weave

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church View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote church Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2018 at 12:53pm
To me it also was this way, to lower pressure at end where i want to add grip. Now i get wished handling bias balance with alignment, so running same pressure on all corners.
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Tony H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony H Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 2018 at 11:00pm
Originally posted by ealing86 ealing86 wrote:

running the rears at a lower PSI means that they'll be more grippy causing the front to slip first? 

Not the way it feels to me. At the very least, lower pressures make the breakaway more progressive; I believe the breakaway occurs earlier too. 

 I run the fronts at a 'high 35', meaning I have about 10% more in the fronts, which if you have regard to the weight distribution, means the pressures match the static load.

None of which helps with the OP's problem...


Edited by Tony H - 16 May 2018 at 7:23am
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Sammy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sammy Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2018 at 9:19am
So I went for a second opinion on the balancing and the rears were WAY off... had them rebalanced but the car is still weaving. I've noticed that it is pulling to the left too. Car is booked in tomorrow so hopefull;y they'll sort it!
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EB2429 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EB2429 Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2018 at 11:49am
imo 
Balancing of wheels shouldn't effect the vehicle weaving on a main road, neither should tyre pressures that much,  They may both cause other issues but not weaving in a straight line (unless the tyre is flat).  All cars are sensitive to changes but the GT86 i wouldn't say is that unique. 

Most if not all tyres have a film from new as part of the normal manufacturing process that goes after 500miles for example and grip is improved, so it could be this (but unlikely).

However a couple of things that others may not have mentioned:
1: Has anyone taken it out for a jolly and hit a kerb while you were on holiday? As it sounds like toe has somehow gone out?
2: Do the tyres have any production dates on them? are the years of production very different?
3: Are they all the same load rating?  This is the number after 215/45R17  it is either W87 or Y91 i think and they should be all the same. This can cause weird issues with driving including weaving and pulling.

The only other issue to look at is whether something is loose? 

Sweeping statement coming up about your post above: Some garages will say the last place you took it to hasn't done a good job, its part of the industry rule to undermine other garages in an attempt to gain trust and repeat business (If you second opinion was a different place), sometimes its justified sometimes its not.  If the balancing was way off it would have likely vibrated the chassis possibly through the seat as its rear tyres and this would have been felt at speed.  Also it hasn't cured the weaving (naturally) so was it way out? 

I hope you get it sorted as their is nothing worse than lack of confidence in the car on public roads.




Edited by EB2429 - 16 May 2018 at 3:56pm
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Amrano View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Amrano Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2018 at 12:45pm
Was a wheel bumped . Alignment might be off too. Plus all these potholes weren’t be helping [:x]
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Harry G View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Harry G Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2018 at 2:07pm
GeekIt sounds as though a full alignment check at a specialist place is called for.  

 Did you leave the car at either place where the tyres/wheels were dealt with?  If so did someone decide it needed a 'Test' run?  I always note the mileage when handing over for work and tell them as well.
They don't make 'em like they used to! Thank goodness
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sammy Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2018 at 3:13pm
Thanks for all the replies!
 
1: Has anyone taken it out for a jolly and hit a kerb while you were on holiday? As it sounds like toe has somehow gone out?
 
I had the car serviced first, then the tyres changed a few days later by my father whilst I was on holiday. The car wasn't weaving until the tyres were changed. It's unlikely my father hit a curb, but you never know. It wasn't taken for a jolly by the garage as it's a family friend that owns it.
 
2: Do the tyres have any production dates on them? are the years of production very different?
 
I'll check this tonight, where do I look?
 
3: Are they all the same load rating?  This is the number after 215/45R17  it is either 88 or 92  they should be all the same. This can cause weird issues with driving including weaving and pulling.
 
I'll have a look when I get out of work!
 
Sweeping statement coming up about your post above: Some garages will say the last place you took it to hasn't done a good job, its part of the industry rule to undermine other garages in an attempt to gain trust and repeat business (If you second opinion was a different place), sometimes its justified sometimes its not.  If the balancing was way off it would have likely vibrated the chassis possibly through the seat as its rear tyres and this would have been felt at speed.  Also it hasn't cured the weaving (naturally) so was it way out? 
 
In regards to this, I was stood with the bloke whilst he balanced the wheels on the spinning machine, unless he could change the calibration of the measurement device, then I doubt he could have made it up.
 
Trying to avoid taking it to Fensport all the way in Peterborough to get it dealt with.....
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EB2429 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EB2429 Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2018 at 3:52pm
Sounds fair enough about the garage, i'm just very cynical in general as I deal with garages all day long Smile

If you google tyre production date it shows some pics which is better than me trying to explain it as the pictures really help.  but of all the 3 options i think its the least likely as it should make the least impact on the performance of the car, (but its not impossible).

The load rating is a good one as this can and does have an effect on the car, It should be W87 or Y91 i think (i'm only suggesting these as you have worked your way through the many other options already put forward by others)

If its that bad, do be careful how much you drive it thoughThumbs Up
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