What is your speed climbing 6.5% grade?

[Zandar]

I have been testing my '07 CC Precedents's speed and hill climbing. I would like to compare with other carts.

I have a 1/2 mile 6.5% grade

CC is lifted with a Genesis rear seat.

I am running 23x10.5x12 tires/rims

Two passengers.

Ave speed up this 1/2 mile grade is 10.5 mph.

Yours?

Z.

[JRL]

I also run 23x12s on a 2000 txt and it runs about 65-70 mph up hills...and downhill.
Couldn't resist! [emoji57]


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[PuttPutt]

Originally Posted by Zandar

I have been testing my '07 CC Precedents's speed and hill climbing. I would like to compare with other carts.

I have a 1/2 mile 6.5% grade

CC is lifted with a Genesis rear seat.

I am running 23x10.5x12 tires/rims

Two passengers.

Ave speed up this 1/2 mile grade is 10.5 mph.

Yours?

Z.

Is the motor and controller stock?

I have an ezgo TXT PDS with 500 amp controller Admiral B2 motor and it slows way down on hills and my tires are a hair under 18".
So 6.5 % that's 6.5 feet rise in 100 feet or 65 feet rise in 1000 feet
I'm guessing with my upgrades on 6.5% I slow down to around 13 0r 14

My point is if stock drive train big tires up hill is going to be slow.

Oh and nice cart JRL

[JRL]

With a stock motor, I would guess that anything that lowers motor speed and max's motor load (wheels, weight, big hills, low batteries) could be rough on the motor?

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[Dragracer_Art]

My stock 96 DS with a 1510 250a controller and stock sepex motor, 2g cables with 6 new Trojan T875's would hold 14mph on a decent grade, 21mph going downhill.

[scottyb]

Electric cart motors produce more torque at low rpm than the upper end. When the cart encounters a hill the motor slows until the torque being produced (at the lower speeds) matches the load. The Load is a combination of several factors including the % of incline, cart weight, and the tire size and roll resistance.

[klubber]

So does increasing the amperage (changing controller) increase the speed on the hills or are you limited the same speed as the motor has to slow to gain the torque?

[Allmanac]

Amperage = torque and Voltage = speed. So yes in a sense increasing amperage would gain you more speed up inclines because the added torque is helping maintain speed.

[Sergio]

The answer is a little more complex since it depends on the ability of the Motor to turn the additional available amperage into actual torque.

It also puts the motor further away from the efficiency curve, meaning for each additional amp consumed there is minimal torque increase as most of the Armature current turns into heat, and since it is a Sepex Motor with thinner wires in the Field coil, the additional heat increases the resistance of the Field coil which in turns prevents the motor from developing torque and the Motor just gets hotter.

We all know that a stalled motor will self destruct pretty quick due to the huge current that will flow since the only resistance to current flow is the wire in the coils.

As the motor starts to gain speed, the Back EMF produced reduces the voltage on the motor which reduces the current.

The OEM motor is capable of producing more torque and if all You need is another 20-30% increase, a new controller and good batteries will get You there, but more than that you really should consider a new motor, in addition to the controller and good batteries, that is designed for the application.

[scottyb]

Designed for the application is the key phrase. Stock motors are designed for golf. The fact they can be used with taller tires or back seats on moderate terrain is a testament to their over design (Yam G29 being the exception).