should i upgrade???

[bigcbizle]

Installed the 2 gauge cables today and wow im not sure how much of a difference i should have seen
But it really picked the cart up!
Once again plans have changed i removed my 1 week old jakes lift and my wheels
They are in the for sale section if anyone is interested?

[bigcbizle]

Here is a couple pics

[bigcbizle]

Im going to a set of custom 12 inch wheels with low pro tires
And no lift and i will ordering a alltrax 4865 this week

[JohnnieB]

Originally Posted by bigcbizle

Im going to a set of custom 12 inch wheels with low pro tires
And no lift and i will ordering a alltrax 4865 this week

With no lift, you're limited to about 20" tire height, so a 650A controller may be a bit of an overkill.

Of course, there is nothing wrong with overkill.

[Sir Nuke]

Originally Posted by JohnnieB

With no lift, you're limited to about 20" tire height, so a 650A controller may be a bit of an overkill.

Of course, there is nothing wrong with overkill.

not a bit......better to have to much than not enough.....and room to upgrade as well.

[JohnnieB]

A stock controller (275A) with a stock battery pack (36V) will allow the motor to draw 10.5kW of electrical energy while a 650A controller with a 48V battery pack will allow the motor to draw 33.1kW.

With 23" tires, about 12.8kW is needed to maintain stock acceleration and hill climbing performance. That would require 335A with a 36V pack or 251A with a 48V pack.

With 20" tires, only about 11.9kW is needed to maintain stock acceleration and hill climbing performance. That would only require 310A with a 36V pack or 233A with a 48V pack.

On 20" tires, a 650A controller powered by a 48V pack will generate about 300% of stock acceleration and hill climbing performance, so the question becomes:
How much of that power can actually be applied to the ground?
At some point the rear tire will spin, or front tires will be lifted off the ground, or something in the mechanical drive train will fail.

Then you have to toss in questions like:
What is the cart going to be used for? (Formula-One cars don't do well on golf courses or city streets- unless the streets are closed to other traffic )
Are the wife and kids going to drive the cart?

That is one of the nice things about a programmable controller, such as the Alltarx 4865, if it is a bit much, it can be dialed back to just right.

I'm not saying do it or don't do it. Just providing food for thought.

[bigcbizle]

Well the controller i have now npx 400 amp is not rated for a aftermarket motor
So thats why im wanting to upgrade
I mainly use the cart to run around the camp. Alot of the time its hauling 4 people
It runs really good right now i can hit the gas from a dead stop in my yard and do circles
I really like have the down low power thats why i was thinking the 650
What do you guys think?

[bigcbizle]

Also will i see any top speed gains at all after the bigger controller?

[JohnnieB]

Originally Posted by bigcbizle

Also will i see any top speed gains at all after the bigger controller?

No. Or at least probably not.

Battery pack voltage limits the max RPM the motor will spin at.
However, there are factors such as tall tires, excessive resistance in the high current loop, amp limit of the controller and mechanical drag that will prevent the motor from spinning at its max RPM for the voltage applied.

If, and only if, the existing controller cannot provide the amps needed to turn the motor at the max RPM dictated by the battery pack voltage, some speed improvement may be realized.

With 20" tires, a 400A controller, good batteries, good cables and a cart that rolls freely, upping the controller amps isn't very likely to up the speed.

To get more speed, you will have to go to a higher battery pack voltage.

[Sir Nuke]

Originally Posted by JohnnieB

No.
With 20" tires, a 400A controller, good batteries, good cables and a cart that rolls freely, upping the controller amps isn't very likely to up the speed.

To get more speed, you will have to go to a higher battery pack voltage.

OR change out the motor to a high speed version.