ratios ??

[redflash]

I ask because some of you guys just have mathematical minds, can't pour a cup of coffee, but mathematically you can whiz this stuff off.
Ok. I want to know what my final drive ratio is........ here's the specs tav30 driving a 9 tooth sprocket...... to a 60 tooth axle sprocket......which is the ring gear of a mazda miata differential with a 4.3 to 1 gear ratio......and 18 inch tires...... that equals what ?? please if you passed math, I didn't, help me here!
what is the final rear axle ratio ? I appreciate your country brilliance

Da Flash

 

[karl]

If I got this correct, you got a tractor.

Starting ratio from motor to axle is 37 to 1, "top gear" would be
26 to 1, for a blazing top speed of 7mph.

To make things simple, forget about the torque converter for now, and use this calculator.
You can punch in the sprocket sizes, or ratio.

So to the calculator, 10t to 50t is the same as entering 1 to 5, got it?

Go Kart Gear Ratio Calculator for Jackshaft Setup

www.bmikarts.com

 

[redflash]

Not necessarily.....with 10 teeth on driver and 60 on axle I clocked about 34 MPH.....( 21 inch tires) I just dropped to 9 and 60, and 18 inch tires. Haven't clocked my speed yet but I surmise about 28 MPH. Off road here in california doesn't mean ripping around an orchard like the "cars and drivers" guys do. Off road here means rocks, sand, pucker bushes . steep inclines and rocky fire roads in sand and rock, so grunt is as important as speed.
but occasionally when you find flat ground....speed is nice too. It's a real balance here.

I know from the chart on "electric scooters. com" that my ratio of 9 tooth to 60 tooth with 18 inch tires is 6.67:to 1 @ 3200 rpm, and this nets me about 27 to 29 + mph........ what I don't know is how my miata differential and axle setup of 4.3 to 1( in addtion to the 6.67 to 1.......affects the overall final drive ratio

By the way..crank the pred 212 up to 4000 rpm, and we achieve 34-35 mph with the same gearing.

Da Flash

 

[karl]

I misunderstood , thought you had 60t on the pinion, driving the diff, because you stated what the gear ratio of the diff was.
It's kind of confusing with that detail in there.

Edit- you have me lost, Picture? What I posted is the final drive ratio, from engine to axle. Gear ratio's multiply with compound reduction.

 

[redflash]

9 teeth on torque converter driven....60 teeth on axle , 18inch tire= 6.67 to 1

The axle sprocket is actually mounted to what was the ring gear on a mazda miata differential that diff has a 4.3 to 1 ratio......so how do I combine those two figure to know what the final drive ratio is ?

Is it as simple as adding the 2 figures?........simply that would be 11 to 1............ I'm not sure if it's that simple or not......anybody know for sure ?

 

[karl]

Ah, the differential has zero effect on gear ratio.

The pinion gear and the ring gear that you removed provide the 4.3 to 1 ratio.

Unless this axle is somehow completely different than and any other RWD axle I have seen.

 

[redflash]

aha have I found brilliance ? yes pinion is removed, and the sprocket is bolted to the ring gear flange....diameters are not identical.......AHA


Da Flash