Calculate speed of a golf cart

razor1 · 05-21-2012, 04:14 PM

I'm trying to figure out the speed possible with my Shuttle 6 cart, and ran into the following equation online:

RPM’s of motor X Tire Radius (in inches) / Gear Ratio X 168 = Miles per Hour

I know the gear ratio of the cart is 14.7:1
The tires are 8"

Does anyone know the RPM of a 73291G04 ezgo motor?

Kelly G · 05-21-2012, 05:00 PM

http://www.buggiesgonewild.com/speed-calculator.php

razor1 · 05-21-2012, 05:02 PM

Thanks. Now I just need to figure out the RPM of the motor.

kab69440 · 05-21-2012, 07:07 PM

The motor's rpm is listed on the spec plate affixed to motor can.

Papajohn011964 · 05-21-2012, 08:39 PM

razor1 · 05-21-2012, 10:21 PM

Normally it is on the plate, except when you're dealing with EZGO who want to keep everything secret.

Papajohn - I can only use GPS once you install everything on the cart. I'm trying to run numbers before I do the upgrade to figure out which way to go.

kab69440 · 05-21-2012, 11:27 PM

Well, if your motor is a GE 2.5 hp or a D&D 8 hp, I can post the specs for those.

JohnnieB · 05-22-2012, 08:50 AM

73291G04 is a 48V PDS motor and I've got a 36V PDS motor (73445G02), but it will spin at about 4,400 RPM.
(17.4" tire diameter and 12.44:1 gears @ 18.2 MPH on level ground.)
Without the RPM being limited by the controller, the 36V PDS motor will spin in the 5.5-6.0K range. (If you can feed it the Watts it needs.

)

Perhaps a dumb question, but if the cart is currently running, why not measure existing speed and calculate current RPM?
Then you can plug in the projected gains for the future upgrades into the equation for a ballpark figure of the end result.

razor1 · 05-22-2012, 09:56 AM

The cart is running, but it's hard to figure out if the controller is limiting the motor and/or the battery pack is. The batteries are not new and are probably not pushing the optimal amount of power. Your information does help a lot. Thank you.

JohnnieB · 05-22-2012, 10:42 AM

Jack the rear wheels off ground and put on jackstands.
It doesn't take very much current to just spin the tires, wheels and brake drums, so you'll probably be able to hear if controller is limiting RPM even with sick batteries.

When I floor mine quickly, it surges a few times and then settles down to a steady whine. (My 1206MX controller has an up ramp on acceleration, so it doesn't reach max instantly.)
When I press throttle slowly, it stops getting faster (sound wise) at about a quarter to third of the way down and no change in sound from there on to the floor.

Surprisingly, my rear wheels, tires and brake drums are well balanced.

05-21-2012, 04:14 PM	#1
razor1 Gone Wild Join Date: Mar 2011 Posts: 245	Calculate speed of a golf cart I'm trying to figure out the speed possible with my Shuttle 6 cart, and ran into the following equation online: RPM’s of motor X Tire Radius (in inches) / Gear Ratio X 168 = Miles per Hour I know the gear ratio of the cart is 14.7:1 The tires are 8" Does anyone know the RPM of a 73291G04 ezgo motor?
razor1 Gone Wild Join Date: Mar 2011 Posts: 245

05-21-2012, 05:00 PM	#2
Kelly G Getting Wild Join Date: May 2009 Location: South Carolina Posts: 137	Re: Calculate speed of a golf cart http://www.buggiesgonewild.com/speed-calculator.php

05-21-2012, 05:02 PM	#3
razor1 Gone Wild Join Date: Mar 2011 Posts: 245	Re: Calculate speed of a golf cart Thanks. Now I just need to figure out the RPM of the motor.
razor1 Gone Wild Join Date: Mar 2011 Posts: 245

05-21-2012, 07:07 PM	#4
kab69440 Gone Wild Join Date: Aug 2010 Location: Marion, Ohio Posts: 1,391	Re: Calculate speed of a golf cart The motor's rpm is listed on the spec plate affixed to motor can.

05-21-2012, 08:39 PM	#5
Papajohn011964 Getting Wild Join Date: May 2012 Location: Canyon Lake Texas Posts: 118	Re: Calculate speed of a golf cart GPS

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05-21-2012, 10:21 PM	#6
razor1 Gone Wild Join Date: Mar 2011 Posts: 245	Re: Calculate speed of a golf cart Normally it is on the plate, except when you're dealing with EZGO who want to keep everything secret. Papajohn - I can only use GPS once you install everything on the cart. I'm trying to run numbers before I do the upgrade to figure out which way to go.
razor1 Gone Wild Join Date: Mar 2011 Posts: 245

05-21-2012, 11:27 PM	#7
kab69440 Gone Wild Join Date: Aug 2010 Location: Marion, Ohio Posts: 1,391	Re: Calculate speed of a golf cart Well, if your motor is a GE 2.5 hp or a D&D 8 hp, I can post the specs for those.

05-22-2012, 08:50 AM	#8
JohnnieB Techno-Nerd Join Date: Jun 2011 Location: West Virginia Posts: 19,654	Re: Calculate speed of a golf cart 73291G04 is a 48V PDS motor and I've got a 36V PDS motor (73445G02), but it will spin at about 4,400 RPM. (17.4" tire diameter and 12.44:1 gears @ 18.2 MPH on level ground.) Without the RPM being limited by the controller, the 36V PDS motor will spin in the 5.5-6.0K range. (If you can feed it the Watts it needs. ) Perhaps a dumb question, but if the cart is currently running, why not measure existing speed and calculate current RPM? Then you can plug in the projected gains for the future upgrades into the equation for a ballpark figure of the end result.

05-22-2012, 09:56 AM	#9
razor1 Gone Wild Join Date: Mar 2011 Posts: 245	Re: Calculate speed of a golf cart The cart is running, but it's hard to figure out if the controller is limiting the motor and/or the battery pack is. The batteries are not new and are probably not pushing the optimal amount of power. Your information does help a lot. Thank you.
razor1 Gone Wild Join Date: Mar 2011 Posts: 245

05-22-2012, 10:42 AM	#10
JohnnieB Techno-Nerd Join Date: Jun 2011 Location: West Virginia Posts: 19,654	Re: Calculate speed of a golf cart Jack the rear wheels off ground and put on jackstands. It doesn't take very much current to just spin the tires, wheels and brake drums, so you'll probably be able to hear if controller is limiting RPM even with sick batteries. When I floor mine quickly, it surges a few times and then settles down to a steady whine. (My 1206MX controller has an up ramp on acceleration, so it doesn't reach max instantly.) When I press throttle slowly, it stops getting faster (sound wise) at about a quarter to third of the way down and no change in sound from there on to the floor. Surprisingly, my rear wheels, tires and brake drums are well balanced.

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