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Student of the obvious
Join Date: May 2000
Location: Phoenix
Posts: 7,714
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Odd lumpy wear on outer edge of RA1s
Anybody ever experience this? There is a lumpiness to the outer edge of my RA1s. They are definitely at the end of their useful life... at my last autocross the rear got very loose. When I got home I noticed that the left side had a $.25 size chunk missing where the cord is now showing. The tires have had this wear pattern for a while and on both sides of the rear. I crossed them (ie dismounted/remounted) left to right and got the same results on the "new" outer edge. I can't really figure out what would cause the uniform high and low spots. Any ideas?
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Lee |
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02-23-2008, 07:28 PM
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Smart quod bastardus
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I have experienced this too. I think it is a sign that the tires are used up. It is probably related to the belt construction.....but the fact that you see cords means stop using them. How much toe in are you running, as that may be a cause too. I am no tire expert, but I have seen this happen to me.
I had just started seeing cords less than the size of a dime on one tire at the end of a DE weekend. All I did was drive home 250 miles on them and it opened up to the size of a half dollar......lucky to make it home.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max ---"When you're racing it's life! Anything else either before or after, is just waiting" |
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02-23-2008, 08:24 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,333
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How old are your shocks?
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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02-23-2008, 10:34 PM
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Registered
Join Date: Jan 2004
Location: Allentown, PA
Posts: 406
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Normal for RA1's.
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Josh '87 911 Carrera 3.2 Coupe |
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02-23-2008, 11:09 PM
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MBruns for President
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Yep - normal for RA1's - that's the sign that you need new tires.
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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02-24-2008, 06:33 AM
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Student of the obvious
Join Date: May 2000
Location: Phoenix
Posts: 7,714
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Quote:
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Lee |
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02-24-2008, 06:38 AM
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Registered
Join Date: May 2005
Location: Cridersville, OH
Posts: 1,879
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Delamination, Tire is done.
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75 911 Indian Red- RUFWAN2B 2000 Boxster 2000 & 2007 Dobies www.stahlwerks.com Cages and preparation for your Porsche “People who never make mistakes must get tired of doing nothing” Bill : The origin of the orgy of Porsche |
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02-24-2008, 06:51 AM
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Student of the obvious
Join Date: May 2000
Location: Phoenix
Posts: 7,714
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What's odd about this is that it started when the tires had plenty of rubber left. Once I swapped the tires on the wheels, the former outside edge smoothed out and the new outside edge got lumpy.
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Lee |
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02-24-2008, 08:21 AM
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Smart quod bastardus
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Check your toe in settings.....this may be causing this.
My theory is that the tires are scuffing from too much negative toe. As long as the tires stick, why worry? But it does look like those tires are worn out anyway.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max ---"When you're racing it's life! Anything else either before or after, is just waiting" |
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02-24-2008, 04:16 PM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,020
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That is a classic sign of shocks and tire balance.
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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02-24-2008, 04:59 PM
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Registered
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once they get past bald they start to regenerate new tread
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82 SC , 72 914 |
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02-24-2008, 05:08 PM
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Student of the obvious
Join Date: May 2000
Location: Phoenix
Posts: 7,714
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Quote:
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Lee |
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02-25-2008, 11:36 AM
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Herman the German
Gone to California
Turbo
Porsche
1972 porsche 914
