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Old 02-08-2018, 04:50 PM   #1
Rwalsh77
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Default Torque Gain After Controller Upgrade

What kind of gains would I be getting if I upgraded to 350 amp Curtis controller rather than 250 amp one I am running right now?

current setup:
2004 EZGO TXT Series
4 gauge cables,
HD F/R switch
stock motor
stock controller (Curtis P/N: 25864G09)
10s2p - 42v MAX - Lithium Ion Battery Pack (Nissan Leaf)
18" tall tires
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Old 02-08-2018, 07:24 PM   #2
JohnnieB
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Default Re: Torque Gain After Controller Upgrade

Top speed on level ground will stay the same.

There will be an increase in torque at low RPM, but how much depends on how many amps the stock motor is capable of drawing at lower RPM.

Torque is directly proportional to armature amps and armature amps are inversely proportional to RPM, so the torque gain only exists at an RPM below the max RPM at which the motor is capable of drawing the maximum throughput of the stock (250A) controller.

Sounds like you have increased the pack voltage to 42V, so the controller and solenoid have to be upgraded to components that are designed to operate at that voltage or higher.
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Old 02-08-2018, 08:36 PM   #3
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Default Re: Torque Gain After Controller Upgrade

Quote:
Originally Posted by Rwalsh77 View Post
What kind of gains would I be getting if I upgraded to 350 amp Curtis controller rather than 250 amp one I am running right now?



current setup:

2004 EZGO TXT Series

4 gauge cables,

HD F/R switch

stock motor

stock controller (Curtis P/N: 25864G09)

10s2p - 42v MAX - Lithium Ion Battery Pack (Nissan Leaf)

18" tall tires


What did you have to do to get the batterie pack to wrk? I have been researching for a while now and cannot figure out how to do it. I have a western 42volt with bad batteries


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Old 02-08-2018, 08:40 PM   #4
Rwalsh77
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Default Re: Torque Gain After Controller Upgrade

Long story that will be shorter the next time I do it.

I will try to respond later though sorry I don’t have time right now




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Old 02-08-2018, 09:12 PM   #5
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Default Re: Torque Gain After Controller Upgrade

Okay. Here it goes...
Apologies in advance if I go on tangents in the middle

Nissan Leaf cells are technically 2 cells each in parallel already. Each cell then reads out around 7.8v nominal. 7.8x5cells is ~39 volts and perfect for my 36v series cart. For added range I took 2 sets of 5 and ran them in parallel. This is how I got to 10s2p. 10 series 2 parallel. I got lucky and found a guy locally in Phoenix that put it all together for me ready to go. Just out with the old and in with the new right? Wrong, my EZGO has a false floor, the batteries just sit on the edges of angle iron and once removed there was no floor. I had a friend of mine weld a new floor in. Removing the center angle iron so it was all flat! Then I covered all that with Bedliner for longevity. Now I can put the new pack in... works great! But I have no lights! You cannot just hook the 12v stuff up to 2 batteries anymore; one because it is a bad for batteries in general and 2 because the voltage doesn’t match now on the cells. Hooked up a voltage reducer and boom. Ready to go! With the new 12v system came a complete cart require for me since the previous owners had mangled the hell out of it but I hope yours is better!

Hit me up with questions as this is all fresh in my mind


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Old 02-08-2018, 09:26 PM   #6
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Default Re: Torque Gain After Controller Upgrade



Battery pack is much smaller and only weighs 80 pounds



Charger is onboard but not mounted yet. Then I replaced the charging port with a normal plug




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Old 02-08-2018, 09:51 PM   #7
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Default Re: Torque Gain After Controller Upgrade

Will they guy sell another setup? Or Is it something easy to do?


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Old 02-10-2018, 10:07 AM   #8
bronsonj
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Default Re: Torque Gain After Controller Upgrade

Where did you get the plug to mount in place of the charge port?

I have a partial Chevy Volt pack I am going to use on my cart. That male-plug in place of the charge port would work nicely on my cart.
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Old 02-11-2018, 11:51 PM   #9
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Default Re: Torque Gain After Controller Upgrade

I’m sure the guy can package up more packs but I’m not sure on shipping.


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Old 02-11-2018, 11:53 PM   #10
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Default Re: Torque Gain After Controller Upgrade

Charging port was basic off amazon. I had to rivet in a new cover panel over the old hole and then drilled for the new smaller one and a cut off switch to prevent possible parasitic power drain

NOCO GCP1 13 Amp 125V AC Port Plug with Integrated Extension Cord https://www.amazon.com/dp/B009ANV81S?ref=yo_pop_ma_swf


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