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  1. Mopar1973Man

    Mopar1973Man

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    Tractorman

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Showing content with the highest reputation on 09/11/2021 in all areas

  1. What I have always looked for when looking for engine performance in a vehicle is, "what will be the engine rpm in a specific gear at a specific highway speed that I would drive at based on a specific engine (gas or diesel). Engine performance charts are the place to get this information. At minimum, I would want to know at what engine rpm is peak torque and peak horsepower. Engines typically perform best just above their peak torque rpm, or at least around their peak torque rpm. For example, my stock '02 Cummins is 245 hp and 505 lb/ft of torque. The horsepower rating is at 2900 rpm and the peak torque rating is at 1600 rpm. This is why engine rpm's between 1800 and 2000 work well with @Mopar1973Man's final drive ratio recommendation. A '99 Ram 5.2 gas engine specs are 235 hp and 300 lb/ft torque. But the horsepower rating is at 4400 rpm and the peak torque rating is at 3200 rpm.. In general, this would tell me that a rear axle ratio of 4.10::1 would be more suitable because of the peak torque rpm. Knowing every gear ratio for the transmission and tire diameter will be key for getting this right. - John
    1 point
  2. Has any one done 400+ miles in just a half tank of fuel? Yes tires and gear ratio have huge effect with custom tuning. Something you can do with diesel but not gas. From Casade ID to Stanley ID then all the way home.
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