Continental GTD Tire Issues
02-16-2017, 10:21 PM
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Continental GTD Tire Issues
I just saw this article on the GTD wet tires getting a redesign. http://sportscar365.com/imsa/iwsc/co...d-tire-issues/
Interesting quote on the cause of most failures. Something most folks can learn from at all levels...
Interesting quote on the cause of most failures. Something most folks can learn from at all levels...
....
According to the memo, the root cause of the tire issues pointed to shoulder fatigue, largely due to under-inflated tires.
“Changing conditions made it difficult to set cold pressure and achieve hot pressure targets,” the document says. “While we recommend minimum hot pressures in our Roar Bulletin, it is not a straightforward process on how to achieve them.
“The pressure build is dependent on the track temperature and prevailing conditions, which changed drastically early in the race.”
Continental says that the teams not affected by any issues — the majority the class — protected their tires during low pressure windows, avoided curbing and utilized wet patches on the track to keep the tire from overheating.
....
According to the memo, the root cause of the tire issues pointed to shoulder fatigue, largely due to under-inflated tires.
“Changing conditions made it difficult to set cold pressure and achieve hot pressure targets,” the document says. “While we recommend minimum hot pressures in our Roar Bulletin, it is not a straightforward process on how to achieve them.
“The pressure build is dependent on the track temperature and prevailing conditions, which changed drastically early in the race.”
Continental says that the teams not affected by any issues — the majority the class — protected their tires during low pressure windows, avoided curbing and utilized wet patches on the track to keep the tire from overheating.
....
02-16-2017, 11:52 PM
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02-17-2017, 10:17 PM
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Been there done that.
Cold morning (not freezing) at Lime Rock Park. Trying to get heat in my tires and hit some curbing. Tire split along the sidewall.
I'm more of a 5 - 6 warm up laps and stay off the curbs kind of guy now.
Cold morning (not freezing) at Lime Rock Park. Trying to get heat in my tires and hit some curbing. Tire split along the sidewall.
I'm more of a 5 - 6 warm up laps and stay off the curbs kind of guy now.
02-17-2017, 10:47 PM
#6
Drifting
Originally Posted by fleadh
I had a blowout in the rain, at night, on the banking.... so I probably shouldn't say anything about the tires. :-)
-mike
-mike
Originally Posted by LuigiVampa
Been there done that.
Cold morning (not freezing) at Lime Rock Park. Trying to get heat in my tires and hit some curbing. Tire split along the sidewall.
I'm more of a 5 - 6 warm up laps and stay off the curbs kind of guy now.
Cold morning (not freezing) at Lime Rock Park. Trying to get heat in my tires and hit some curbing. Tire split along the sidewall.
I'm more of a 5 - 6 warm up laps and stay off the curbs kind of guy now.
This is very curious stuff for me. I've never really run much in colder weather.
02-17-2017, 11:00 PM
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When its really cold I normally try to start a little higher and do a series of bleed downs rather than starting low and trying to do one hot bleed down.
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02-17-2017, 11:27 PM
#8
Drifting
Originally Posted by LuigiVampa
Hoosier R7 and it was a balmy 50 degrees.
When its really cold I normally try to start a little higher and do a series of bleed downs rather than starting low and trying to do one hot bleed down.
When its really cold I normally try to start a little higher and do a series of bleed downs rather than starting low and trying to do one hot bleed down.
Good thread. I hope others chime in.
02-18-2017, 04:07 PM
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So, on a cold day, you will not get the build you normally would. To make up for that, you usually start with a higher initial pressure. If you start with a regular warm pressure, say what you would use on a 80*F ambient day when it's only 50*F, you won't get to your target and run the risk of overstressing and damaging the tire.
For anyone who paid attention to Deflategate, use the ideal gas law to your benefit.