1998 EZ-GO TXT Series 36V Upgrades and Performance Issues

[adog35]

Cart:
1998 EZ-Go Series TXT 36V
Lifted
23” Carilile All-Trail Tires
Backseat Kit

Hello Everyone

I recently did a few upgrades to my cart about 4 months ago.
Replaced batteries Trojan T-105 6V,
Upgrade to 4GA Cable & AMD 7122 Motor

These upgrades gave me a speed increase from 13-14mph to 21 MPH
but, of course I sacrificed some torque. I wanted to get the torque back and
ordered a 500 AMP Curtis 1205, HD Selonoid, and supporting components from EV Drives

I installed the 1205 today, but seem to have no increase in torque. The cart accelerates in a very linear fashion. If you go from 0-100 throttle quickly the cart
takes 1-2 seconds then takes offs and slowly gets up to it”s top speed.

Why would this be? I am kind of disappointed with the controller upgrade as I was hoping it would have noticible increase in torque. The cart feels no different with the 1205. I checked and adjusted the ITS throttle, checked the voltage on the M- and B+ at full throttle and the readings were consistent. The only thing I have not upgraded was the F/R switch.

Any advise would be appreciated.

[Sir Nuke]

adog.......the addition of the new controller has only allowed you access to more amperage from your batteries....nothing more. and will NOT give you more torque. there is only one thing that you can do that will increase your torque, but it will reduce your speed, and that would be to change to a high torque motor.

HOWEVER, the way you can keep your speed and increase BOTH your speed AND the torque, would be to upgrade your carts drive system to 48v.

I am not familiar with the new controller you got, but I believe its programmable, meaning it can be used for both 36v OR 48v.

[adog35]

Sir Nuke

That could be true, but something just feels off. The
cart is really a pig out of the line. Slower than it was on the
OEM motor.

Could it be that the AMD 7122 makes a lot less Torque
than the OEM motor?

[Sir Nuke]

Originally Posted by adog35

Sir Nuke

That could be true, but something just feels off. The
cart is really a pig out of the line. Slower than it was on the
OEM motor.

Could it be that the AMD 7122 makes a lot less Torque
than the OEM motor?

yes.....I have a similar motor in mine, as you can see in my sig, and ran it on 36v for a few years, but upgraded to 48v last year and that made a world of difference.

[adog35]

That is kind of a disappointment. There is another cart with the same set up as me,
But they have the older GE variant motor. There cart makes way more torque than my
7122.

At this point I will be staying 36V as I just purchased new batteries.

Do I have any other motor options? D&D?

[scottyb]

In my experience 48 volts is the best solution to your problem.
Sell the new 6v on CL or add 2 more in the rear bagwell.

A key factor here is the motor is a speed motor that does not make alot of torque... and the big tires resulted in reduction
of torque. That was a 1 - 2 punch.

[JohnnieB]

I don't have any good specs on the AMD motors, but the description given for the 7122 , it is a "Speed" motor while the 7126 that Sir Nuke has is called a "High-Speed" motor, so I'm pretty sure the 7122 has more torque than the 7126.

If you still have your stock AND motor handy, measure its length as well as the length of the 7122. If they are the same length, the torque loss is roughly proportional to the speed gain. If the 7122 is longer, its torque may be close to stock torque despite the higher speed.

Yes, you have other motor options, but you'd still have a controller that was designed in the 1990's or earlier. An Alltrax SR controller is state of the art and is user programmable, so it would be a much better choice.

---------
The 23" tall tires effectively reduce the available torque by 22%, so you need a motor that has more than stock torque (or at least the same as stock) as well as higher speed.

[adog35]

Originally Posted by scottyb

In my experience 48 volts is the best solution to your problem.
Sell the new 6v on CL or add 2 more in the rear bagwell.

A key factor here is the motor is a speed motor that does not make alot of torque... and the big tires resulted in reduction
of torque. That was a 1 - 2 punch.

I see how a “speed” motor could reduce torque, but I didn’t think
It would be that great of a reduction.

One of my observations is that the AMD 7122 does not require a
controller upgrade according to their site. What leads me to believe the
motor was built with only a 275 AMP OEM controller I mind.

On the other hand many of the D&D motors and AMD 7126 require
Controllers. Do you feel a different motor would get me back to OEM
torque now that I have the extra controller capacity?

[scottyb]

The power to weight ratio can sometimes be a delicate balance with an 800 pound cart and less than 5 hp to play with. Small changes can make a big difference.
I'm not familiar with that controller so I cannot answer the question.
Contact your supplier and ask their opinion on that.

[adog35]

Originally Posted by scottyb

The power to weight ratio can sometimes be a delicate balance with an 800 pound cart and less than 5 hp to play with. Small changes can make a big difference.
I'm not familiar with that controller so I cannot answer the question.
Contact your supplier and ask their opinion on that.

Lets say I wanted to start over and replace the Controller and Motor.

What would you recommend?
I feel my Motor choice wasn’t great after the additional research.

Majority of terrain in flat.