If you have another car whose gear ratios from first to fifth range between 3.0:1, 2.5:1, 2.0:1, 1.5:1 and 1:1, its’ ratio difference will be 0.5:1.Ĭomparing both cars side by side, you’ll agree that the first car has a close-ratio transmission. For instance, if you’re working with a car whose first to fifth gear ratios progress between 2.6:1, 2.2:1, 1.8:1, 1.4:1 and 1:1, then the difference between each gear is 0.4:1. But what do each of these mean?Ī close-ratio transmission has gear ratios that are closer to each other in comparison to a wide-ratio transmission. The majority of cars have a close-ratio transmission, but that does not mean that there aren’t many others that have a wide-ratio transmission. One can then expect a 45 MPH x 3 (or 135 MPH) for transmission ratios that progress between 3.0-to-1 (first) and 1.0-to-1 (fifth). Consequently, the ability of the output shaft to spin three times as fast as the first gear will result in a faster speed. This means a 1.0:1 transmission ratio and as such, the fifth gear input shaft and output shaft will both have a 6,000 RPM. Looking at it from another perspective, if the same transmission has the same number of teeth on both the input and output gear in its fifth, then both gears will rotate at the same speed. If our calculations are correct, then the car in the first gear will only be able to move at a speed of 45 MPH (miles per hour) per 6,000 RPM. If the engine is spinning at 6,000 RPM (revolutions per minute), the input shaft will also move at the same speed, even though the output shaft will be revolving at 2,000 RPM (6,000/3.0). What this means is a 3.0:1 ratio for the first gear, which will allow the car to move quickly from a point of rest since torque gets multiplied by a factor of 3.īut this ratio might not have an impact on the speed. If we have a transmission with an input gear of 12 clutch teeth and output gear of 32 teeth, then for every complete revolution of the output gear, the input gear will have to revolve three times (12 * 3 = 36). Let’s take a look at the real-life performance of these shafts. This is because the intermediate shaft’s gears usually have the same number of teeth in comparison to that on the input shaft. The purpose of the intermediate shaft is to enable the input and output shafts to rotate in the same direction. The gears tell us the transmission ratios – the ratios between the input and output shaft speeds. A transmission contains an input shaft, intermediate shaft, and output shaft, which all rely on a number of gears with different teeth-counts. Transmissions are designed in a way that will enable a car to move swiftly with little effort provided by the engine. Upgrades can be as important for your car’s engine as changing the transmission oil and filter. The increased level of performance can be attributed to enhanced transmission gear ratios, where the engine is spends more time in its sweet power spot. This, in turn, provides an extra boost in its speed. Instead, simple transmission upgrades will make sure that your engine can handle more power and have an improved level of performance, as well as average peak power. If that should happen, it could lead to a breakdown of the transmission components, such as the shaft or forks. That is why a lot of people consider transmission upgrades for their system – to ensure that the engine does not produce more torque than the transmission can handle. Here’s a fact: manual or automatic transmission upgrades can do a lot of good for your car, starting from an increase in acceleration to ensuring that your transmission components do not break down when you least expect. Are you a racer or you’re out to get one of the speedy cars with a strong rear-wheel horsepower? Then you can achieve your need for speed by packing a lightweight gear design and gear ratios that can negotiate various race tracks.
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