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/wwwthreads_images/icons/tongue.gif If you look at fuel consumption curves developed from the factory test data, you will notice that fuel consumption (Gal/Hr/Hp) is optimum at a fairly narrow RPM range. Above that range, intake losses and piston speed affect it, and below that the four-stroke cycle just cannot make good use of the exhaust flow for scavenging, and the best carb CFM for good venturi action. If you change tires, you need to figure out how many TURNS PER MILE you were running the driveline originally, and get back to that number by a gear swap. To figure it get the TURNS PER MILE of the old tires(the tire shop has this in the book) and then multiply by the axle ratio to get DRIVELINE TURNS PER MILE AT 60. By using driveline turns per mile at 60, you can divide by various ratios till you get the TURNS PER MILE OF THE BIG TIRES that the dealer book said they were. So....Turns Per Mile(little tires)X Original Gear Ratio = Turns Per Mile (big tires) X New Gear Ratio. You can see from that equation that as turns per mile go DOWN that axle ratio MUST GO UP. The engine DOESN'T CARE what tires you run or what gears you have....all it knows is that it wants a CERTAIN NUMBER of driveline turns per mile to propell the Jeep at 60 MPH and get good fuel useage numbers./wwwthreads_images/icons/smile.gif

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 

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/wwwthreads_images/icons/tongue.gif What you'll need to do is set up the fuel tank with a drain. Your gas mileage will be SO GOOD that you'll have to stop periodically and drain out fuel to keep from running the tank over./wwwthreads_images/icons/crazy.gif

CJDave
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.
 
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