Tire Psi Vs. Mpg
07-03-2008, 01:39 AM
#17
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Running at a pressure greater than needed, if the contact patch is flat you should not cup. The best way is the chaulk method, but I personally just look at the tire right after getting of a dusty/dirt road. I have always used this method and have never had a tire cup, on any rig from cars to my 3500. This inclued M/T's, A/T's, Super Swampers, Etc...
Yeah.. all those rock crawlers better add more air, 4 psi isn't going to cut it....
Pressure really hurts traction, its amazing how many people don't believe this. I have seen two trail rigs with similar mods and the same tire be black and white on the trails because I was at 10 psi and the other rig was at 35. My summer pressure is max pressure for a contact patch, with my current setup I can run about 65-70 up front and 55ish in the rear. In the winter I take 10-20 psi out, less if I am going to be driving on the interstate for any period of time for safety reasons. For lots of dirt road driving on a empty truck I go to 40/35. (On my toyota I go to 20/20)
Yeah.. all those rock crawlers better add more air, 4 psi isn't going to cut it....
Pressure really hurts traction, its amazing how many people don't believe this. I have seen two trail rigs with similar mods and the same tire be black and white on the trails because I was at 10 psi and the other rig was at 35. My summer pressure is max pressure for a contact patch, with my current setup I can run about 65-70 up front and 55ish in the rear. In the winter I take 10-20 psi out, less if I am going to be driving on the interstate for any period of time for safety reasons. For lots of dirt road driving on a empty truck I go to 40/35. (On my toyota I go to 20/20)
07-03-2008, 01:57 AM
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"Wider tires also benefit from lowering the tire pressures providing a larger contact patch and conforming over the uneven terrain. How much you air down depends on the size of the tire and the stiffness of your sidewall. Common air-down recommendations for mud is to lower tire pressures down to about 15 to 20 PSI"
from another leading off road site regarding taking your hummer in the mud:
"Tire pressure for normal driving in a Hummer is 26 psi front, 28 rear. With CTIS, air pressure can be increased up to 45 psi for heavy loads. Typical offroad tire pressure is 20 psi, however for driving in mud, air pressure can be reduced to 10 psi, resulting in a very large footprint. An alarm sounds if pressure falls below 8 psi"
from a toyota off roading site regarding 4 runners:
"Low tire pressure (less than 20 psi) is used for mud, sand, and very loose dirt. It should only be used for low speed driving as it will damage tire sidewalls if run at road speeds and cause early tire failure"
from dunlop:
Source: 4X4 Driving Tips at Dunlop. Rough Terain -10%
Sand -25-40%
Mud -30%
Loose ground and very low speed up to -50%
Source: Dunlop
i'll stop now.
07-03-2008, 08:24 AM
#19
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07-03-2008, 12:09 PM
#21
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Coast test
I see at least +2mpg when I air up again in the summer for towing season. Also, I notice that my truck won't coast out of my garage in neutral in the winter when I air down to 45psi, but it will in the summer when I'm up at 60 psi.
07-03-2008, 01:14 PM
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You're right Soulezoo, Goose Bay gets lots of snow. Up to 24 1/2 feet one winter in the early 80's. In fact snow has fallen there in every month of the year. mid June to mid Aug are nice months sometimes getting to 100 degrees. The North is a land of extremes. We have personally snowmobiled till May 10th and some guys will be out on the ice hunting seals till very near the end of May. Nothin to do with PSI and MPG, but there you have it anyway.
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