Why Is Final Drive Ratio Important? Accelerate Faster!
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Published 2017-01-15
Car Gears - • Car Gears - Explained
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Why Does First Gear Have The Most Torque? • First Gear Torque - Explained
The final drive ratio is typically the gear ratio for the differential, or the final location where the gearing is altered before being sent to the wheels. Changing the final drive ratio heavily impacts the way the car behaves. If you increase the final drive ratio, each gear will have greater wheel torque, while sacrificing top speed. If you decrease the final drive ratio, each gear will have a higher top speed, however deliver less torque. Raising the final drive ratio also means you'll be at higher RPM in your top gear, raising your engine's speed on the highway. You'll also need to correct the speedometer.
How To Calculate The Top Speed Of A Specific Gear In MPH:
Top Speed = ((RPM*60)/(Final Drive*Current Gear Ratio))*((Wheel Size (in.) +(2*(Tire Ratio/100)*(Tire Width (mm)/25.4)))*Pi)/(5280*12)
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All Comments (21)
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"And you're gonna hit vtec at some point" That is gold.
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I love how casually he mentions VTEC
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Also changing final drive to a more aggressive set up can also increase the amount of times you need to shift in order to reach 60mph and may alter acceleration time.
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Just wanted to say how much I enjoy your videos. I love cars and have always been fascinated with how they work. Your explanations of automotive systems make me appreciate the complexity and beauty of cars that much more. Thanks!
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Details mentioned that could be included: how to change the gear ratios, and what device/where do you get one to correct the speedometer. If they're mentioned (the first being kind of the tpoci), I'm thinking it's always good to include details. Great vid!
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Does increasing tyre size affect / increase rpm? I've got a 1985 toyota pickup with 31s but the stock wheels are 29s. Thanks.
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As always, very well explained and simple understanding! We appreciate ya' Thank you sir
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Perfectly explained. Exactly the information I was looking for. Thank you very much.
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wow, that old gears video... your marker skills have improved greatly on the whiteboard.
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Amazing video as always! Esssentialy its like changing gears in a mountain bike. in 1st gear with the small disk every hard step at each pedal equals front tire lift off, and the more you switch to 2nd and 3rd disk in the pedals, less torque is generated from your own muscles instead of an engine :)
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I believe the proper term is "VTEC Yo!"
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Fantastic video Jason very informative. I also own an 02 AP1 which I've been considering doing this for a while now as I had seen an original Japanese vtec club style video in which they put a very mildly tuned S2 against a standard AP1 and Ap2,the one which had the shorter final drive was very eager through the gears off the line. I know you was thinking of doing this modification on another previous video of yours I watched so keep us updated
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shameless plug for my theoretical acceleration/topspeed worksheet https://drive.google.com/open?id=0B66fRFJ0IrcQZWJYcS1sSnQ0Z28 have comparisons of s2000 (ap1 and ap2) with the new mx5 (ND) with and without an ECU tune
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Great video Jason, I'm sure glad you haven't stopped saying your signature opening diaogue. it really sets you apart from the other guys. Again thank you.
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Thank you so much for thinking of all non-Americans :) Love your channel, keep up the great work! Best wishes from Germany
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Clear and detailed explanation. Thank you!
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Tell me, i have 2 gearboxes being the one in my car and the one i bought from a scrap yard. They have the same gear ratios from gear one to 4. My transmission has a final drive ratio of 4.111 and the one i bought has a final drive ratio of 4.444, do you advise swapping the differential?
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very informative! great video! I'm catching up to you buddy.... been working at a mechanic shop! really liked your detailed explanation about why and how the final drive crossover basically can be the meaningless to have it be more aggressive. @4:15 if your're looking at a graph. very informative. keep killing it. love your videos
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Consider strengthening your driveline, especially for the drag strip. I snapped an axle at the line, and that was on foot wide drag radials.
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Thanks this helped a lot I play way too much pixel car racer and didn't understand final drive but now I have perfect torque.
