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Old 02-23-2011, 11:02 AM   #1
gtiso
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Default Gear ratio tire size max & max rpm

What's the formula to figure this out?
Right now I have stock gears ,25" tires on a stock GE motor 4400 rpm at 36 volts
How many rpm's am I turning at 72volts 41 mph
Can I boost another 72 volts for a total of 144?
can I go to a 6/1 gear?
144 volts should give me tons of torque
And the 6/1 gear should give me top end speed
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Old 02-23-2011, 09:28 PM   #2
redriderno22
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Default Re: Gear ratio tire size max & max rpm

at 144 volts that motor will turn into a nice metal slinging bomb...
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Old 02-24-2011, 08:49 PM   #3
72volt_ezgo
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Default Re: Gear ratio tire size max & max rpm

Quote:
Originally Posted by gtiso View Post
What's the formula to figure this out?
Right now I have stock gears ,25" tires on a stock GE motor 4400 rpm at 36 volts
How many rpm's am I turning at 72volts 41 mph
Can I boost another 72 volts for a total of 144?
can I go to a 6/1 gear?
144 volts should give me tons of torque
And the 6/1 gear should give me top end speed
Motor rpm at x volts is not something that can be used to calculate this
because we don't know if that's motor unloaded rpm? Motor loaded rpm?
If loaded,how much load?
Point is we need to know the gear ratio.
If your cart has 12.44:1,then with a 25"od tire...math..math...math
I come out to 167.3 motor rpm/mph so at 41 mph = 6862 motor rpm.
(regardless of what voltage)

I also think running 72V is pushing it as it is! I am doing the same but I try to keep in mind what the strength and weakness of my system are so I use
my cart accordingly.

If you go 6:1 gear ratio on your 25" tires,you are going to pull major amps on takeoff and I imagine at speed as well because the motor will not be able to reach a happy higher rpm where the amp draw can fall off. So unless the whole system is beefed up to handle this I don't recommend doing higher voltage and gears.
This is just my non professional opinion!
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Old 02-25-2011, 12:13 AM   #4
dougmcp
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Default Re: Gear ratio tire size max & max rpm

The answers:
I have stock gears ,25" tires on a stock GE motor 4400 rpm at 36 volts 26.3 MPH
How many rpm's am I turning at 72volts 41 mph 6850 RPM
Can I boost another 72 volts for a total of 144?Sure but you will need another motor, D&D make them $1700 plus mods.
can I go to a 6/1 gear? Sure
144 volts should give me tons of torque
And the 6/1 gear should give me top end speed And likely rip the axles out of the cart
The only consideration left the 1/2 mile you will be able to go on a battery charge.
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Old 03-03-2011, 06:39 AM   #5
rusty sr.
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Default Re: Gear ratio tire size max & max rpm

would you post the formula used to get these numbers. i can certainly use that information.
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Old 03-03-2011, 08:13 AM   #6
dougmcp
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Default Re: Gear ratio tire size max & max rpm

Quote:
Originally Posted by rusty sr. View Post
would you post the formula used to get these numbers. i can certainly use that information.
Here's one on this forum: http://www.buggiesgonewild.com/speed-calculator.php
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Old 03-03-2011, 08:53 AM   #7
rusty sr.
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Default Re: Gear ratio tire size max & max rpm

thanks doug!!
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Old 03-03-2011, 09:35 AM   #8
TDAWG
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Default Re: Gear ratio tire size max & max rpm

Quote:
Originally Posted by gtiso View Post
What's the formula to figure this out?
Right now I have stock gears ,25" tires on a stock GE motor 4400 rpm at 36 volts
How many rpm's am I turning at 72volts 41 mph
Can I boost another 72 volts for a total of 144?
can I go to a 6/1 gear?
144 volts should give me tons of torque
And the 6/1 gear should give me top end speed
My question would be what are you trying to accomplish, a drag cart, or a daily driver? A stock motor gets hot pretty quick with the voltages and gear ratios that you are talking about.
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Old 03-04-2011, 01:16 AM   #9
gtiso
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Default Re: Gear ratio tire size max & max rpm

A weekend warrior
Not full out racing just want to stay on top as the fastest cart in the neighborhood
I am running 41 mph now with several carts nipping at my heels
Looking for the next step in performance and not really sure what to do
Motor?controller? Controller bypass/ boost setup? Gears? Or more voltage
What is the next biggest bang for the buck
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Old 03-06-2011, 08:33 PM   #10
victorjohn
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Default Re: Gear ratio tire size max & max rpm

Actually, there is a "fault" in that formula. That is theroretically correct, meaning if the cart is jacked and not running on the road. Friction, drag (wind), cart and passenger weight, type of running surface, just to name the major factors, are not considered.

That formula considers the engine rpm x 60 to get the rev per hour, the circumference of the tire (to get the distance traveled- theoretically) and the final gear ratio (a divisor).
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