What tire pressure do you run?
10-30-2017, 07:42 PM
#31
Senior Member
I doubt the chalk test is an appropriate method to establish best tire pressure.
A tire spinning at a rate of 70mph will have a profile that is substantially different than a tire at rest. This is due to the centripetal forces applied to a rotating tire. A chalk test is essentially a static test. Tire pressure should be optimized for performance when the vehicle is moving, not when it is stopped. If you can figure out how to perform a dynamic chalk test at 70 mph the results would be useful.
A tire spinning at a rate of 70mph will have a profile that is substantially different than a tire at rest. This is due to the centripetal forces applied to a rotating tire. A chalk test is essentially a static test. Tire pressure should be optimized for performance when the vehicle is moving, not when it is stopped. If you can figure out how to perform a dynamic chalk test at 70 mph the results would be useful.
Last edited by ALTAJAVA; 10-30-2017 at 07:46 PM.
10-30-2017, 10:40 PM
#32
Senior Member
Hmm I only paid $30 for my obd dongle to use with Forscan, USD that is. Works great.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
.
I was thinking of an expensive bluetooth obdlink as I no longer have a windows laptop, but then again I'm going to have to learn to use Wine on OS X if I want to use Forscan anyways.
I doubt the chalk test is an appropriate method to establish best tire pressure.
A tire spinning at a rate of 70mph will have a profile that is substantially different than a tire at rest. This is due to the centripetal forces applied to a rotating tire. A chalk test is essentially a static test. Tire pressure should be optimized for performance when the vehicle is moving, not when it is stopped. If you can figure out how to perform a dynamic chalk test at 70 mph the results would be useful.
A tire spinning at a rate of 70mph will have a profile that is substantially different than a tire at rest. This is due to the centripetal forces applied to a rotating tire. A chalk test is essentially a static test. Tire pressure should be optimized for performance when the vehicle is moving, not when it is stopped. If you can figure out how to perform a dynamic chalk test at 70 mph the results would be useful.
I feel like increased PSI from warm tires that have been running for some time would have a greater effect on even wear. My tires are 46 when cold and all the way up to 52 after a half hour on the road.
Last edited by nubbins_; 10-30-2017 at 10:45 PM.
11-11-2017, 12:42 PM
#33
Senior Member
I doubt the chalk test is an appropriate method to establish best tire pressure.
A tire spinning at a rate of 70mph will have a profile that is substantially different than a tire at rest. This is due to the centripetal forces applied to a rotating tire. A chalk test is essentially a static test. Tire pressure should be optimized for performance when the vehicle is moving, not when it is stopped. If you can figure out how to perform a dynamic chalk test at 70 mph the results would be useful.
A tire spinning at a rate of 70mph will have a profile that is substantially different than a tire at rest. This is due to the centripetal forces applied to a rotating tire. A chalk test is essentially a static test. Tire pressure should be optimized for performance when the vehicle is moving, not when it is stopped. If you can figure out how to perform a dynamic chalk test at 70 mph the results would be useful.
11-12-2017, 08:00 AM
#34
'97 F150 V8 4.6L
Last I heard a tire should gain 2 pounds of pressure when warmed up. That may not be a universal formula for all tires but the temperature increase is the best indicator.
11-12-2017, 09:16 AM
#35
Senior Member
My tires are OEM. The truck placard says 55# front, and 60# rear, so that's what I run. My truck came with the HDPP and LT245/75R17 LRE tires.
So far, I have 47K miles on them, and they still look really good, and I've pulled a TT for 1/2 those miles.
So far, I have 47K miles on them, and they still look really good, and I've pulled a TT for 1/2 those miles.
11-19-2017, 07:20 PM
#36
Senior Member
11-20-2017, 06:40 PM
#37
Senior Member
it's a matter of choice...read your door jamb & start there (that is a minimum ) ... Most standard trks come with P-Metric tires... it also states on the sidewall of every tire the maximum you can go to (usually 44lbs).....Personally I run my tires @ 40lbs.... It may feel a little stiffer on ride & cornering but I find tire wear & mileage are not affected. If anything it probably will increase your tire mileage.... If running heavier tires (C/D or E rated) you can increase your tire pressure up to the stated maximum posted on the sidewall....but again it all depends on your trk.+ load weight.
11-20-2017, 11:04 PM
#38
Senior Member
35 or 36 on mine. 
