for example, a 1st gear ratio of 3.55 vs 4.17
will the 4.17 one feel more aggressive and accelerate with more power?
same goes for higher gears, for example in 6th gear, 0.6 vs 0.69, will the 0.69 feel like it pulls better?
what about final drive? lets say the 3.55 of the first gear and has a transmission final drive of 4.62
and the 4.17 one for the first gear and has a final drive of 3.64
what does it mean? does higher final drive means the car accelerates faster?
i'd love to have someone to explain these to me
Higher gear ratio results in better acceleration but lower speed. Lower gear ratio results in higher speed but lower acceleration.
If you want to understand how it works, perhaps this might interest you:
https://science.howstuffworks.com/transport/engines-equipment/gear-ratio.htm
And what does final ratio means?
lets say both cars has a 1st gear ratio of 4.17 but on has final ratio of 3 and the other of 4, what does it mean?
Do you mean final drive ratio?
https://beginrv.com/final-drive-ratio-definition/
Yes, i've seen the video, yet it still doesn't explain this:
i'm comparing the mazda 6 speed automatic's gearing to bmw's zf6 automatic used in the 330i e90, the numbers are these:
skyactiv automatic 6 speed:
1st Gear
3.55 :1
2nd Gear
2.02 :1
3rd Gear
1.45 :1
4th Gear
1 :1
5th Gear
0.71 :1
6th Gear
0.6 :1
Final Drive
4.33 :1
Reverse
3.89 :1
zf6 automatic calibrated for e90 330i:
1st: 4.17
2nd: 2.34
3rd: 1.52
4th: 1.14
5th: 0.87
6th: 0.69
Reverse: 3.40
Final drive: 3.64:1
we can see that the ZF's gears are more aggressivly tuned than the mazda's, however, the final drive of the mazda is higher than the ZF's, what does it mean? and what is the differance between gear ratios and final drive
You use gear ratio to find out the difference in RPM between an engine and each engaged transmission's gear it runs.
You use final drive ratio to find out the difference in RPM between a transmission and a differential that drives wheels.
So which one of them will affect the way a gear feels in acceleration? how strongly it pulls?
Final drive ratio is the same all the time. Gear ratio depends on an engaged gear. It is a difference if you take off in 1st gear or try to do it in 4th or 5th. Same we can talk about pulling and/or driving uphill.
If power is the same, it's your final drive ratio that counts. You have better acceleration, but a slower top speed, or slower acceleration and higher top speed. A "taller" gear ratio accelerates better than a smaller one, but your top speed will be affected. You can also sacrifice a little acceleration for higher top speed. Your final drive ratio is what counts most in two equally powered cars with the same transmission.
final drive is the same thing as gear ratio.
Have you ever ridden a bicycle with multiple speeds? Same thing. Fuel economy is affected as well.
It's not really something you mess with on cars, unless you're getting into drag racing, offroading and putting on huge mud tires and stuff.
