21mph cart WANT MORE SPEED

Nmiller02

Hey guys, new to the forum, recently picked up my cart and posted about it once so far in regards to thought on price I payed for it etc.

Right now it's running stock wheels and tires at 36v with and alltrax axe 4855 (500amp) controller and D&D motor model#170-006-0001 series wound. The cart runs well like i said it does 21-22 mph. I will be lifting the cart soon on 23" tires. I called D&D they said NOT to run this motor with larger tires and lift kit something about I'll burn it up or whatever....

The cart is used on flat ground no large hills mainly camping at the river which is all flat maybe some small small hills mainly flat. I'd like to have something that hauled a$$, any suggestions ? I'd prefer to keep my controller assuming it is salvageable with what I'm trying to achieve. Is it crazy to ask for 30 mph with 23" of tire and my 500amp controller on 36v ?


Thanks guys let me know what I can do !

BGW

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yurtle

Your 4855 will do anything you need at 36 volts or 48 volts. In general, amperage will give you more torque and higher voltage will increase your speed. Going to 48 volts, and/or high speed motor, and/or larger tires and/or gears will increase speed. I can't speak to your motor.

93yellowclubcar

That motor model appears to be designed to be a high speed motor (not a torque motor, with a series cart you have to choose, although there is a mid-ground but it doesn't have the monster torque or the extreme speed) for use with stock height tires from what I can see from a quick search. My opinion is go 48 volts and be done with it, because for the kind of speed you are wanting, 48 volts is going to be a must no matter what motor you run - think of it as a series cart prerequisite for high speed. If the motor melts down (unlikely), then you can get one wound that'll do what you want. Just my two cents worth...

sportcoupe

D&D told you not to run larger tires with their high speed motor because the increased load on the motor will do two things, run the motor much hotter and draw too many amps from the batteries. Both of which are bad. Will it work, yes the cart will drive and appear "normal" but if you were to monitor motor case temps after a long ride they will be well over 220°F I am sure. 230°F case temp is the accepted max and you will likely exceed that. Especially on dirt trails riding part throttle.

Max amp draw is another issue. Typically with a high performance setup you want to see the motor pull around 60-85 amps at full speed cruise. Whatever you do don't exceed 100 amps or your battery life will take a hard hit resulting on battery replacements every two years, if the motor lasts long enough and doesn't overheat.

Since you already have controller and motor in place and want more speed, upgrading to 48v is your only option. You already have the controller, you would need a charger, solenoid and whatever battery change needed to make a 48v pack. If they are new batts, adding two more 6v batteries would do it. If they are older pack then you have a choice, either 6-8v or 8-6v batteries.


Yes, it is crazy. You need to be at least 48v, better yet 72v to get that speed safely on a series cart.

scottyb

Series drive are the workhorses not the speedster you are looking for. D&D can build you a motor to go 25mph. Big tires may give you a couple more mph if your pack can sustain the load. Speed is much easier to reach with a sepex drive motor.

Olman

Just thought I would throw this out there--- Have you ever driven a cart at 30+ mph? I thought I wanted to go 30+ until I did. Because of the short wheelbase, carts get really squirrelly above 25 or so. You are going to spend a lot of dough and may get an unpleasant surprise when you are done. Just sayin

yurtle

And it's squirrely at 25 - 35 with a really tight steering, tie rod ends, toe-in, etc. If anything is worn, it's gets even worse.

scottyb

Good points, guys
At 25mph the cart is already traveling at two times the engineered design speed.

JohnnieB

For starters, just going to 23" tires will not get you 30MPH.

Stock height tires are assumed to be 18" tall since they are marked 18 X 8.50 X 8, but in reality they are from about 17.4" to 18.5" depending on the brand and type. If your tire are in fact 18" tall, your motor is spinning at 5,111 RPM at 22 MPH. Mathematically, if you installed tires that actually measure 23" tall, you would get about 28.1 MPH at 5,109 RPM, but your motor is not likely to reach that high of an RPM with the taller tires because it takes more torque to turn taller tires.

In fact, if you installed low pressure 23" tires with an aggressive tread pattern, it might even reduce the top speed from 22 MPH.

On the other hand, staying with stock height tires and upping the pack voltage to 48V (or higher) might get you 30 MPH, but it would also over-rev the motor. At 30 MPH on 18" tires, the motor will be spinning at 6,969 RPM and the max recommended RPM on your motor is 6,000 RPM (or 6,500 RPM, depending on the motor and who you talk to at D&D)

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What type terrain will you be driving on? Paved roads or dirt trails?

You can build a series cart to do 30+ MPH on paved roads OR navigating muddy trails along rivers, without overheating the motor and controller, or sucking lead off the plates in the batteries, but building one to do both will be a challenge.

JohnnieB

Just adding my $0.02 to what Olman, Yurtle and Scottyb said.

Mechanical brakes on rear wheels only are not designed to stop a half ton cart going over 20 MPH.

A short wheel based, narrow tracked vehicle that is top heavy (IE: lifted cart) is easy to roll and roof support brackets are not roll-bars.