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- jtqmopar
First, for any tuners checking on this thread:
When you tune a transmission, do you ever round up to the hundredths place? I don't know why gt5 lets you have so much freedom of tuning. For the settings you are allowed to make you would need so many tiny little teeth on each gear that they would strip out on the first or second time peak hp/ torque is reached.
I changed this a few times in creation, so if you notice anything blatantly wrong feel free to correct me (MotorCityHami, that means you
)
Now, I'll needlessly guide you from the engine to the drive wheels!
For this example we will use the 2014 Dodge Viper GTS-R transmission ratios, which are taken directly from the car's spec sheet here
If you'll notice, none of these have any numbers in the third decimal point (or thousandths place).
But, back to what I was saying:
(I'm going to round to the nearest whole number to avoid too much confusion)
The gears inside the transmission work the same way also, since there is one input from the engine and one output, therefore 1st gear through last gear (4th, 5th, 6th etc.) determine how many times the output shaft turns. For this example, we will use 1st gear form the picture. First gear is 2.26:1, meaning if your engine rpm is at 6,700 (peak hp), your input shaft is turning 6,700 times per minute, transferring power to the #1 gear, which turns the output shaft (and in turn the driveshaft) 2,965rpm. (1st gear divided by engine rpm)
Now, for the the ring & pinion (or final gear). You'll see that it is 3.55, or 3.55:1 meaning for every 3.55 turns the driveshaft makes the pinion gear turns 3.55 times and its driven gear, the ring gear, will turn once. To be able to do this the ring gear will have 35 teeth and the pinion gear will have 10 (to keep things simple). If you wanted 3.555 final gear you would need 35.5 teeth on the ring gear, which isn't possible.
Now, we'll take that 2965rpm from the driveshaft and divide by 3.55 to get ~835rpm. That's how many times your ring gear (and, in turn, tires) will turn every minute at 2,260 engine rpm.
Since it is applicable to the topic: a higher number is a shorter gear, and a smaller number is a taller gear. This is because the higher the number the faster a car can get through that gear by applying more torque. Although the engine will only produce so much horsepower and torque, the use of gears multiplies the torque from engine to tires. For this explanation, I'll use the 600ft-lb of the 2014 GTS-R [assume these power figures peak at 6700rpm, which is where we are(we will only use torque figures as that is a measurement of rotating force)]. So what does this mean? If the car is currently producing 600ft-lb in 1st gear then you will be applying 4,813.8ft-lb at the tires. You determine this by multiplying the engine's 600ft-lb by 1st gear , 2.26, to get 1356, which is torque at the driveshaft and is multiplied by the 3.55 ring gear to get 4,813.8. (600X2.26= a; aX3.55= result)
Youtube video explaining how transmission works:
https://www.youtube.com/watch?v=vOo3TLgL0kM
When you tune a transmission, do you ever round up to the hundredths place? I don't know why gt5 lets you have so much freedom of tuning. For the settings you are allowed to make you would need so many tiny little teeth on each gear that they would strip out on the first or second time peak hp/ torque is reached.
I changed this a few times in creation, so if you notice anything blatantly wrong feel free to correct me (MotorCityHami, that means you
)Now, I'll needlessly guide you from the engine to the drive wheels!
For this example we will use the 2014 Dodge Viper GTS-R transmission ratios, which are taken directly from the car's spec sheet here
If you'll notice, none of these have any numbers in the third decimal point (or thousandths place).
But, back to what I was saying:
(I'm going to round to the nearest whole number to avoid too much confusion)
The gears inside the transmission work the same way also, since there is one input from the engine and one output, therefore 1st gear through last gear (4th, 5th, 6th etc.) determine how many times the output shaft turns. For this example, we will use 1st gear form the picture. First gear is 2.26:1, meaning if your engine rpm is at 6,700 (peak hp), your input shaft is turning 6,700 times per minute, transferring power to the #1 gear, which turns the output shaft (and in turn the driveshaft) 2,965rpm. (1st gear divided by engine rpm)
Now, for the the ring & pinion (or final gear). You'll see that it is 3.55, or 3.55:1 meaning for every 3.55 turns the driveshaft makes the pinion gear turns 3.55 times and its driven gear, the ring gear, will turn once. To be able to do this the ring gear will have 35 teeth and the pinion gear will have 10 (to keep things simple). If you wanted 3.555 final gear you would need 35.5 teeth on the ring gear, which isn't possible.
Now, we'll take that 2965rpm from the driveshaft and divide by 3.55 to get ~835rpm. That's how many times your ring gear (and, in turn, tires) will turn every minute at 2,260 engine rpm.
Since it is applicable to the topic: a higher number is a shorter gear, and a smaller number is a taller gear. This is because the higher the number the faster a car can get through that gear by applying more torque. Although the engine will only produce so much horsepower and torque, the use of gears multiplies the torque from engine to tires. For this explanation, I'll use the 600ft-lb of the 2014 GTS-R [assume these power figures peak at 6700rpm, which is where we are(we will only use torque figures as that is a measurement of rotating force)]. So what does this mean? If the car is currently producing 600ft-lb in 1st gear then you will be applying 4,813.8ft-lb at the tires. You determine this by multiplying the engine's 600ft-lb by 1st gear , 2.26, to get 1356, which is torque at the driveshaft and is multiplied by the 3.55 ring gear to get 4,813.8. (600X2.26= a; aX3.55= result)
Youtube video explaining how transmission works:
https://www.youtube.com/watch?v=vOo3TLgL0kM
