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Old 06-01-2018, 10:00 AM   #1
rsw007
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Default Scootyb,Johnnieb and yurtle? loss of torque checklist.

Guys I need a list to check for loss of torque please. did search found few articles one very long one that guy replaced everthing really don't want to go that route. Cart was good past few years just seemed to be badd since old batteris lost power and new ones haven't fixed it as well as I hoped.

1.) 1996 ezgo 36v series cart
2.) alltrax spm48400 controller 3 years old from scottyb
3.) plum quick bandit motor 1 year old
4.) 2ga cables on batteries and to controller. 4ga on the rest "fnr and motor"
5.) new crown cr235 batteries only charged 4 times rest voltage 38.4

So had batteries out for 2 weeks while shopping and cleaning box and cable ends. now cart doesn't seem to pull hills good considering new batteries" not fully broke in yet?"
*About 4.5v-5v drop on hills but speed drops to a crawl.
*no heat on any terminals on the batteries or controller, haven't checked at the motor or fnr lever.
*plan to hook laptop up to see what drive settings are, any suggestions on drive settings?
*had corrosion on cables and sanded them which took the tin coating off outside if that matters .

So do you guys have a checklist made up you could send me to go thru?

sure I forgot something info wise you need.

thanks in advance scott w
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Old 06-01-2018, 10:27 AM   #2
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

Batteries need to be broken in before you push them really hard. What size tires do you have? Try measuring each battery while driving, to see if you have a bad battery. Even new, it's possible.

Just for future reference, you should have all cables the same size in a series circuit. This is not referring to a series motor, but the path the current flows through from one side of the pack to the other. - pack, controller, FNR, motor, then back to the pack. The AWG 2 isn't really doing anything since they are limited by the AWG 4. However, given that you have a 400 amp controller and the smallest cable is AWG 4, you are fine. Unless the AWG 4 cables are old, there's no real benefit to upgrading them.
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Old 06-01-2018, 10:40 AM   #3
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

Make sure your brakes are not dragging.
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Old 06-01-2018, 10:52 AM   #4
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

Did check brakes and there not dragging.
May buy a complete 2ga 13pcs cable set to eliminate that.
23" tires.
Hills were paved rolling hills not offroad.
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Old 06-01-2018, 11:38 AM   #5
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

One more possibility to think about. From reading posts on here for years, I'm suspicious the bandit motor tune doesn't like the big tires. 23" tires are a lot of stress on a motor optimized for speed so it might be starting to fail. Something to think about if you can't find anything else causing your problem.
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Old 06-01-2018, 12:06 PM   #6
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

Hook up your laptop and see if the throttle goes to 100% when it's floored. If not, you need to open the throttle box and adjust. Any ITS manual will tell you how to adjust, even if it isn't the same year as yours.
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Old 06-01-2018, 12:21 PM   #7
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

Quote:
Originally Posted by yurtle View Post
Hook up your laptop and see if the throttle goes to 100% when it's floored. If not, you need to open the throttle box and adjust. Any ITS manual will tell you how to adjust, even if it isn't the same year as yours.
Saw that sticky up top of forum on that that scottyb posted. I'll load the newest lltrax software in my computer and check it this weekend.
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Old 06-01-2018, 12:26 PM   #8
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

The 23" tall tires reduces the torque available where rubber meets road by 22%, so you need a motor (or higher voltage battery pack) that increases the torque by 22% just to have stock performance going uphill. In other words, a high torque motor is needed to turn 23" tall tires and a Bandit is a high speed motor, just the opposite of what is needed.

Having thicker high current cables is more critical on a 36V system than on a 48V system. In a nutshell, it takes 746W to generate 1HP and to get 1HP at 48V it takes 15.5A while at 36V it takes 20.7A. In other words, it takes 33% more amps to do the same amount of work.

Record a data log from the SMP and calculate how many volts the battery pack drops per 100A of current draw. The batteries, in and of themselves, in a broken in 36V battery pack in good health , will drop about 1.0V per 100A. There is about 25' of high current cables in series drive system and if it is 4Ga, it will drop about 0.62V/100A while in 2Ga it is about 0.39V/100A.

The high current contacts and connections will also drop some voltage, about 2.0V/100A is about the best you can hope for with a 36V system.
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Old 06-01-2018, 12:37 PM   #9
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

ITS voltages are different for different controllers.

Measured at the Alltrax controller, the voltage between the black and white wires going to the ITS sensor should be 10V with pedal up and 6V with pedal down.
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Old 06-01-2018, 12:55 PM   #10
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Default Re: Scootyb,Johnnieb and yurtle? loss of torque checklist.

Will do Johnnie.
Not trying to climb walls just get back to where I was before the battery swap. Crowns should be better than the deca/napa batteries I had before. Guess my factory charger is ok for crowns. It's the old black silver and yellow powerwise.
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