There are a dozen or so different combinations of carriers and spools (or Posi units). Mark Williams Enterprises endeavors to make things easier for racers by offering compete ready-to-use thirdmembers that have been set up by experienced technicians. And how does that relate to your engine’s power curve? There are many important questions that can be answered by the M-W calculator. When you’re in high gear (assuming it is 1:1) approaching the lights the lower gear will obviously be eating up more RPM. Will the track hold it? Can it take more? Change the rear end gears to a 4.29 and the torque ramps up to3,903 ft. For example, a 1.82 low gear Powerglide mated to a 4:11 rear end would multiply the base torque to 3,740 ft. At the hit, you’ve got a transmission gear as a multiplier and also the ring & pinion. Let’s take a hypothetical engine with 500 ft. With this info in hand along with the tire size being used and the speed you are looking to run, MW can pinpoint the gear ratio.Īs the rear end gear is a multiplier of torque relative to what’s delivered to the rear wheels, some interesting calculations can come into play. If the RPM is too high and goes past peak power, acceleration will drop off so knowing your peak horsepower and the RPM where it happens is critical. Ideally you want your engine RPM at the finish line to be somewhere close to the point of peak power. Probably the most important of the three variables required to calculate the gear ratio is engine RPM. Although gear ratios will vary with each application and the altitude of the race track, the key to optimizing the ring and pinion ratio is knowing what your engine is capable of.
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