Can gear ratio fractions?
You count the number of teeth on both the driver wheel and on the driven wheel and express these numbers as a ratio, or a fraction. For example, if the driver wheel has 20 teeth, and the driven wheel has 40, calculate the gear ratio as 40/20, which simplifies to 2/1, or 2:1.
How do you calculate a differential ratio?
The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1.
Can you run different diff ratios?
Final drive ratios must be the same. A diff doesn’t have a ratio and is always the same, ie, One wheel stopped, the other side twice the speed. All diffs are the same. Any difference in final drive ratios front to rear will cause failure unless a centre diff is running the DIFFERENCE of speeds.
What’s the diff ratio of a Holden FC?
There only one original and stock diff centre for all FEs and FCs, which has a 3.889 ratio. Having said that, other Holden centres bolt straight in, including 3.55, 3.36, 3.08 and 2.78. Anything shorter than 3.36 is going to put a lot of strain on first gear when you take off. 3.55 is a nice cruising diff.
What was the diff ratio on a Holden 179?
Generally 149’s had 3.55 and 179’s had 3.36. Somewhere around the HK Holden (or thereabouts) they started offering the 3.08 ratio behind larger capacity reds but was also probably an option behind other sized motors.
What’s the ratio of EJ to FX on a banjo?
The 3.89 ratio (FX to EJ) and the later 3.90 ratio are a different tooth count. So the full list of banjo ratios is 2.78, 3.08, 3.36, 3.55, 3.89 & 3.90. To my knowledge there are no 4.11 or 4.56 banjos. Dr Terry. Just consulted my GMH Master Parts Book and it doesn’t give any separate listing for a different ratio for EK Hydramatic.
Which is better a high or low gear ratio?
The lower the number, the faster the car will go with the same number of engine revolutions. The higher the number the better the car will accelerate, but at the expense of high speed cruising. Now for the confusing part of the story. A high numerical gear ratio is called a low gear or low rear end, and vice versa.