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Author Topic:   Street tire vs pyrometer!!!!
odb93
Dirt Forum Champ
Total posts: 537
posted February 25, 2005 07:21 PM  
Ok, I know that using a laser pyr vs a probe pyr will provide surface temp only. The probe will provide more accurace readinng near the cord.
How does this work with a dot street tire?

BIGG C
Dirt Maniac

Total posts: 113
posted February 26, 2005 05:20 PM  
Major thing to remember is not to compare with another car. Take readings and compare with your other tires. Try to balance your temps, as other cars will be different because of pressures, compound, driving style, front setup, etc. BIGG C

odb93
Dirt Forum Champ
Total posts: 537
posted March 02, 2005 01:09 PM  
To clarify my question, Can this be done with a Street tire? Do you press the probe into the Tread??? Or in-between???

How does this affect the tire?

hoosier transplant
Dirt Maniac

Total posts: 104
posted March 03, 2005 03:14 PM  
Take your readings in the tread. Also, take three readings across each tire and in the same location on all four tires. It is best if you have a buddy right there when you pull off track and starts punching even before you get out of car. Tires will cool down real fast and possible uneven cooling so the faster you can get readings the more the readings can tell you what's really going on.

odb93
Dirt Forum Champ
Total posts: 537
posted March 04, 2005 09:46 PM  
I thought the point of the using a probe type was to get true readings at the core? If that is the case, then the temperature would hold longer there then on the surface.

Is this the right line of thinking?

"Take your readings in the tread. Also, take three readings across each tire and in the same location on all four tires. It is best if you have a buddy right there when you pull off track and starts punching even before you get out of car. Tires will cool down real fast and possible uneven cooling so the faster you can get readings the more the readings can tell you what's really going on."

hoosier transplant
Dirt Maniac

Total posts: 104
posted March 05, 2005 09:29 AM  
You are right that the core temp will stay at temp longer, but that is a false reading because the core will heat up the same and stay longer but the problem is that the tread and not the core is where you are getting (or not getting) traction. Because of tread pattern and grooves, air goes inbetween and is trying to cool tread back down. To get a true picture of how the tire is working as far as traction you want to read the tread temps. Also, by taking three readings across tread can tell you if your camber is too much or too little, among other things(air pressure, shocks, springs to name a few). Hope this helps.

odb93
Dirt Forum Champ
Total posts: 537
posted March 07, 2005 10:57 AM  
Thanks Hoosier.
That was not something I thought about.
However wont the core temp and tread temp (in a perfect world) be in direct correlation with each other??

EX: Say the inside of the rf is at 85 degrees on the surface. The core should be close to that reading right?

Even if the tread has cooled off some, it should have been about the same temp on the track???

quote:
Originally posted by hoosier transplant:
You are right that the core temp will stay at temp longer, but that is a false reading because the core will heat up the same and stay longer but the problem is that the tread and not the core is where you are getting (or not getting) traction. Because of tread pattern and grooves, air goes inbetween and is trying to cool tread back down. To get a true picture of how the tire is working as far as traction you want to read the tread temps. Also, by taking three readings across tread can tell you if your camber is too much or too little, among other things(air pressure, shocks, springs to name a few). Hope this helps.


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