projected speed...

BlackHornet · 01-02-2010, 09:30 PM

ok guys, ive used the speed calculator but its saying itll put me at 58 mph.......im not seeing that as true. I was wondering/trying to figure out what the top speed of my cart would be if i switched from stock gearing (12:1) to speed gearing (6:1). Im running an AC motor with stock everything (tires, gears, etc) and getting 29 mph....anyone have a better estimate than the 58 mph? i mean, thats twice as fast and i know thats not right.

thanks

pansser · 01-02-2010, 09:32 PM

whats your top rpm?

BlackHornet · 01-02-2010, 09:41 PM

my top rpm is 6900 and the tires are 18 inch

pansser · 01-02-2010, 11:26 PM

physics and math say that is correct, BUT, your going to run out of amps long before that. your wiring and controllers will be overtaxed. you'll also have no bottom end torque.you'll cook the bearing in your axels because they'll be spinning their little butts off!! The sky will fall and your wife will leave you for rosie odonell

i think you'd be better off with a little larger tire (20"-23") a 23" should give you about 25% increase without cooking any of the above mentioned components.

BlackHornet · 01-03-2010, 01:20 AM

well on a full charge i have 80 lb/ft of torque, so it wont be spinning tires anymore but im almost positive that that is enough to still have some with 6:1s. the only reason why i only go 29 mph is because it is governed at that, not topped out

sms-shop · 01-03-2010, 11:31 PM

and you live on the top of a big hill ...lol...

BlackHornet · 01-03-2010, 11:36 PM

hahaha if youre talking about austin, the cart isnt there....its north of houston. or maybe youre talking about gettin 29 mph on a 48v with 80 lb/ft of torque..well thats the ac motor thing. i just dont want to change the settings on the motor to go more rpm, the motor should handle up to 9,xxx rpms but i figured it would be better to leave it at 6900 rpms and have it going 40 something on only 48v...thatd be nice

MBYMT · 01-04-2010, 01:13 AM

You can make a cart run 40+ mph. Thats insane.

BlackHornet · 01-04-2010, 01:52 AM

im guessing mbymt is new around these parts. well, welcome to the forum and take a gander around the place....youll learn a lot. be prepared to spend a lot of money on a cart haha

MBYMT · 01-04-2010, 01:55 AM

Quote:

Originally Posted by BlackHornet

im guessing mbymt is new around these parts. well, welcome to the forum and take a gander around the place....youll learn a lot. be prepared to spend a lot of money on a cart haha

Thanks BlackHornet. Ive been looking and hoping to spend wisely.

01-02-2010, 09:30 PM	#1
BlackHornet Gone Wild Join Date: Oct 2008 Location: Austin/Willis, Texas Posts: 627	projected speed... ok guys, ive used the speed calculator but its saying itll put me at 58 mph.......im not seeing that as true. I was wondering/trying to figure out what the top speed of my cart would be if i switched from stock gearing (12:1) to speed gearing (6:1). Im running an AC motor with stock everything (tires, gears, etc) and getting 29 mph....anyone have a better estimate than the 58 mph? i mean, thats twice as fast and i know thats not right. thanks

01-02-2010, 09:32 PM	#2
pansser ZONE FREE ZONE Join Date: Nov 2009 Location: lauderdale by the sea Posts: 571	Re: projected speed... whats your top rpm?

01-02-2010, 09:41 PM	#3
BlackHornet Gone Wild Join Date: Oct 2008 Location: Austin/Willis, Texas Posts: 627	Re: projected speed... my top rpm is 6900 and the tires are 18 inch

01-02-2010, 11:26 PM	#4
pansser ZONE FREE ZONE Join Date: Nov 2009 Location: lauderdale by the sea Posts: 571	Re: projected speed... physics and math say that is correct, BUT, your going to run out of amps long before that. your wiring and controllers will be overtaxed. you'll also have no bottom end torque.you'll cook the bearing in your axels because they'll be spinning their little butts off!! The sky will fall and your wife will leave you for rosie odonell i think you'd be better off with a little larger tire (20"-23") a 23" should give you about 25% increase without cooking any of the above mentioned components.

01-03-2010, 01:20 AM	#5
BlackHornet Gone Wild Join Date: Oct 2008 Location: Austin/Willis, Texas Posts: 627	Re: projected speed... well on a full charge i have 80 lb/ft of torque, so it wont be spinning tires anymore but im almost positive that that is enough to still have some with 6:1s. the only reason why i only go 29 mph is because it is governed at that, not topped out

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01-03-2010, 11:31 PM	#6
sms-shop Gone Wild Join Date: Dec 2009 Location: Gastonia NC Posts: 530	Re: projected speed... and you live on the top of a big hill ...lol...

01-03-2010, 11:36 PM	#7
BlackHornet Gone Wild Join Date: Oct 2008 Location: Austin/Willis, Texas Posts: 627	Re: projected speed... hahaha if youre talking about austin, the cart isnt there....its north of houston. or maybe youre talking about gettin 29 mph on a 48v with 80 lb/ft of torque..well thats the ac motor thing. i just dont want to change the settings on the motor to go more rpm, the motor should handle up to 9,xxx rpms but i figured it would be better to leave it at 6900 rpms and have it going 40 something on only 48v...thatd be nice

01-04-2010, 01:13 AM	#8
MBYMT Not Yet Wild Join Date: Jan 2010 Posts: 12	Re: projected speed... You can make a cart run 40+ mph. Thats insane.
MBYMT Not Yet Wild Join Date: Jan 2010 Posts: 12

01-04-2010, 01:52 AM	#9
BlackHornet Gone Wild Join Date: Oct 2008 Location: Austin/Willis, Texas Posts: 627	Re: projected speed... im guessing mbymt is new around these parts. well, welcome to the forum and take a gander around the place....youll learn a lot. be prepared to spend a lot of money on a cart haha

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