Calculate the gear ratio using its definition, according to the formula: K = K1/K2 where K1 is the number of driven gear teeth, and K2 is the number of drive gear teeth. For example, to calculate gear ratios torque from the transmission to the wheels you need to calculate the ratio of the spur gear differential and output shaft gear in the transmission, or as it is called by drivers to find the gear ratio for the main couple.
Count the number of teeth of the gear transmission output shaft, for example there are 15 teeth. Count the number of them on the driven gear, which is attached to the differential, let it be 51 barb. Substitute numbers in the above formula: 51 / 15 = 3,4. The resulting number will be the gear ratio for the main couples this gear. Consequently, the driven gear of the differential will revolve 3.4 times slower than the pinion shaft of a gear box as it rotates.
Calculate gear ratios transmission for each transmission by the above formula. The closer will be the gear ratio, the more smooth and rapid acceleration of the car with sequential gear shift. Count, how many times will reduce engine speed when you change the transmission, dividing the gear ratio is low transmission gear ratio higher.
Draw conclusions based on the presented estimations. Need to know: the higher the gear ratio, the vehicle speed will gain faster, but the transmission will need to switch often. Setting a pair with a lower gear ratio, you can increase the maximum speed of the car, however the car will accelerate worse. Calculate if necessary by the above formula, the gear ratio of gear of any parts in your car.
In the transition from the four-speed transmission five speed you will have less to shift gears, and you can increase the maximum speed in each gear.