tire pressures and size question
05-23-2006, 02:43 PM
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tire pressures and size question
I run 305/30/18's all the way around on the track. I can get a real good deal on some 285/30/18's. Is there enough difference in size to make these 285's not a good deal?
Also I have started cording my tires on the outsides faster than I used to....or at least it seems like it, since I went to starting at 29 psi. I used to start at about 34 psi. Could this make that much of a difference?
Jerry
Also I have started cording my tires on the outsides faster than I used to....or at least it seems like it, since I went to starting at 29 psi. I used to start at about 34 psi. Could this make that much of a difference?
Jerry
05-24-2006, 10:37 AM
#3
Le Mans Master
Originally Posted by RedHotBolt
I run 305/30/18's all the way around on the track. I can get a real good deal on some 285/30/18's. Is there enough difference in size to make these 285's not a good deal?
Also I have started cording my tires on the outsides faster than I used to....or at least it seems like it, since I went to starting at 29 psi. I used to start at about 34 psi. Could this make that much of a difference?
On the other hand, if it is in the 39-40 PSI range, you have probably found more tire grip, and are driving faster, causing more suspension movment in cornering, and thus you have arrived at the point where move (negative) camber is now required.
05-24-2006, 10:54 AM
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Originally Posted by MitchAlsup
If you LIKE to drive a car with oversteer, this is just the ticket you are looking for.
I love oversteer but when I went from 305/30/18's on the rear to 335/30/18's I did not notice very much difference at all.
What is the final pressure just after you leave the track. If it is less than 39 PSI then you may be underinflating the tires.
On the other hand, if it is in the 39-40 PSI range, you have probably found more tire grip, and are driving faster, causing more suspension movment in cornering, and thus you have arrived at the point where move (negative) camber is now required.
I love oversteer but when I went from 305/30/18's on the rear to 335/30/18's I did not notice very much difference at all.
What is the final pressure just after you leave the track. If it is less than 39 PSI then you may be underinflating the tires.
On the other hand, if it is in the 39-40 PSI range, you have probably found more tire grip, and are driving faster, causing more suspension movment in cornering, and thus you have arrived at the point where move (negative) camber is now required.
J
05-24-2006, 04:40 PM
#5
Melting Slicks
A lot of that has to do with camber and alignment setting too. I'm sure Archer has much more neg camber in his car than you do...so he could theoretically start at a lower pressure and not wear out the outside of his tires.
If you can get a really good deal on the tires, then get them...and keep getting lots of cheap seat time. If you're not racing, then the idea is to learn with the equipment you have.
Better yet, run a set of your tires and then run a set of the 285s and see which you like better...and has better lap times. Then try running the 285s just up front and compare them all. As the old saying goes: "One good test session is worth 1000 opinions!"
If you can get a really good deal on the tires, then get them...and keep getting lots of cheap seat time. If you're not racing, then the idea is to learn with the equipment you have.
Better yet, run a set of your tires and then run a set of the 285s and see which you like better...and has better lap times. Then try running the 285s just up front and compare them all. As the old saying goes: "One good test session is worth 1000 opinions!"
05-24-2006, 04:56 PM
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Originally Posted by wtknght1
A lot of that has to do with camber and alignment setting too. I'm sure Archer has much more neg camber in his car than you do...so he could theoretically start at a lower pressure and not wear out the outside of his tires.
If you can get a really good deal on the tires, then get them...and keep getting lots of cheap seat time. If you're not racing, then the idea is to learn with the equipment you have.
Better yet, run a set of your tires and then run a set of the 285s and see which you like better...and has better lap times. Then try running the 285s just up front and compare them all. As the old saying goes: "One good test session is worth 1000 opinions!"
If you can get a really good deal on the tires, then get them...and keep getting lots of cheap seat time. If you're not racing, then the idea is to learn with the equipment you have.
Better yet, run a set of your tires and then run a set of the 285s and see which you like better...and has better lap times. Then try running the 285s just up front and compare them all. As the old saying goes: "One good test session is worth 1000 opinions!"
Good ideas!
J