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  #41  
Old 03-23-2012, 03:58 AM
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Hello Max

I did 3 breakfast runs recently on the NSHW , first time i drive the GTB up , tyre pressure was at 2.2 Front and 2.1 Rear when cold . Have the same feeling as you during 210 - 260 km/h . Did not push it further .

Second run , i release the tyre pressure to 2.0 Front and 1.9 rear , run was almost prefect . No more such feelings at all . Ride felt planted at all speeds , up to 310km/h .

Third Run , same results as second run .

Going for another one this Sunday , have just increased the Tyre pressure today to 2.3 Front and 2.1 Rear . Will let you know if that unstable feeling comes back .

Stock GTB , running 20 inch wheels .
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  #42  
Old 03-23-2012, 04:42 AM
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Quote:
Originally Posted by SW73 View Post
Hello Max

I did 3 breakfast runs recently on the NSHW , first time i drive the GTB up , tyre pressure was at 2.2 Front and 2.1 Rear when cold . Have the same feeling as you during 210 - 260 km/h . Did not push it further .

Second run , i release the tyre pressure to 2.0 Front and 1.9 rear , run was almost prefect . No more such feelings at all . Ride felt planted at all speeds , up to 310km/h .

Third Run , same results as second run .

Going for another one this Sunday , have just increased the Tyre pressure today to 2.3 Front and 2.1 Rear . Will let you know if that unstable feeling comes back .

Stock GTB , running 20 inch wheels .
sounds good ...

i'm doing a run this sunday too, lets see how it goes ...

tnx ...
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  #43  
Old 04-15-2012, 07:17 AM
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update guys ...

took the beast up north for 3 days and ran her hard ...

surprisingly, the skittish behaviour did not manifest itself ...

strange ...

now i'm stumped ...
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  #44  
Old 04-15-2012, 08:14 AM
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Quote:
Originally Posted by maxHP View Post
update guys ...

took the beast up north for 3 days and ran her hard ...

surprisingly, the skittish behaviour did not manifest itself ...

strange ...

now i'm stumped ...
Then I would consider it as tire break in...
Every new tires need at least 400-500kms of runin
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  #45  
Old 04-15-2012, 09:25 AM
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Originally Posted by j09333 View Post
Then I would consider it as tire break in...
Every new tires need at least 400-500kms of runin
well, i'm now at 4,000 km on the clock ...

over the weekend i put on just 1,000 km ...

so it just can't be the running in ...

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  #46  
Old 04-15-2012, 10:51 AM
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Quote:
Originally Posted by maxHP View Post
update guys ...

took the beast up north for 3 days and ran her hard ...

surprisingly, the skittish behaviour did not manifest itself ...

strange ...

now i'm stumped ...
Maybe it was a difference in road quality? I felt that the road we travelled on the first time you took your car up to 300+ was significantly bumpier than the roads we've been travelling on over the past few days.
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  #47  
Old 04-15-2012, 02:29 PM
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Quote:
Originally Posted by maxHP View Post
update guys ...

took the beast up north for 3 days and ran her hard ...

surprisingly, the skittish behaviour did not manifest itself ...

strange ...

now i'm stumped ...
Great News

I think the wieght and rebalance on the wheel/rims worked for you, it did for me.

Sometimes a good rebalance person will move the tire over the rim to help off set the rim problems/defects from the manufacture so the rim will need less weight when balanced correctly with the tire imperfections as well. With the 5g of balance wieght removed and a good balance job may have solved or help solve the problem. Sometimes the car manufactures rush this step to get the car out to the public. That is why some wheel balancer machines are better than others. Hunter balancer puts a load on the wheel as it rotates to simulate real world road conditions and tells the guy exactly where to place the wieght for best performance while measuring the rim fro being true and within the manufactures tollerances.
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  #48  
Old 04-15-2012, 05:52 PM
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Originally Posted by Sareve View Post
Maybe it was a difference in road quality? I felt that the road we travelled on the first time you took your car up to 300+ was significantly bumpier than the roads we've been travelling on over the past few days.
possible, but did not feel like it was the road ...

Quote:
Originally Posted by greyhair View Post
Great News

I think the wieght and rebalance on the wheel/rims worked for you, it did for me.
i'm hoping it was just that extra 5g ...

even so, i'm meeting the local michelin boys to do a full check on their machines ...
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  #49  
Old 04-17-2012, 02:09 PM
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That doesn't seem right at all. Why don't you grab one of the service guys at your local dealership and take him for a spin. Take care of it as soon as possible.
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  #50  
Old 04-17-2012, 06:50 PM
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I haven't been at 300k lately but sometimes full tread depth tires squirm at speed. Now that the tires are worn it may have stopped.
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  #51  
Old 04-18-2012, 08:36 PM
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Originally Posted by 5nine9OC View Post
That doesn't seem right at all. Why don't you grab one of the service guys at your local dealership and take him for a spin. Take care of it as soon as possible.
they refused to go across the border with me ... & not much point locally as the controls are pretty darn tight ...
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  #52  
Old 04-18-2012, 08:37 PM
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Originally Posted by carcommander View Post
I haven't been at 300k lately but sometimes full tread depth tires squirm at speed. Now that the tires are worn it may have stopped.
don't know much abt that ... but perhaps the michelin boys will shed some light on it when i meet them next week ...
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  #53  
Old 04-21-2012, 02:37 PM
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Perhaps high cross wind is the factor?
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  #54  
Old 04-23-2012, 08:07 AM
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Perhaps high cross wind is the factor?
nope.
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