Learn More. Here at Alloy USA we have a made an easy to read chart to help you decide what is on the best gearing for your Jeep. We'll call this overall drive ratio (ODR). DRAG PERFORMANCE CALCULATOR. These would slow our simulation slightly, but this does reveal the advantage to a closer gear spread. 0. For a road race/autocross situation, we'd like to have a multi-geared manual transmission to allow us to keep the engine in its power range at all times. But if you change the tire diameter to 30 or 31 inches, it brings the RPM back down to right at 5k to keep it in its power band. We also added 90 pounds to simulate the added weight of 10-speed. It's possible the car might improve traction with a 28-inch tire, but we're unsure how much that taller tire will affect the gear ratio.
When I first started drag racing 60-foot clocks did not exist. The advantage of the manuals is that even with a four-speed, you have ratio splits closer together than a three-speed automatic. To keep this discussion about gear ratios and not about torque converters, we'll ignore slippage. Both tires have a 94-inch circumference and a 10.2-inch tread width. I only get 14 to 16 mpg at 55mph and an rpm of 2600 at 60 mph my rpm is 2900. what would be the best thing to do to get better mileage. This chart provides values that represent a 1:1 ratio on a manual transmission. For road course guys, the first place to consider is the length of the longest straight. This pulls 6,500 rpm in Second down to 4,400 in Third.
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Given the extremely low overall first gear of the 700R4, it was impossible to feather the throttle when you really got on the gas. For those of us in Southern California we have three tracks within a few hours. But there was more.
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