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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV.



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Old 05-16-2013, 02:59 PM   #1
jdog1065
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Default 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

Okay so I upgraded my old stock controller, solenoid, F&R switch, cables, and motor. I'm now running the following:
Alltrax 500a controller
HD F&R switch
400/1000a solenoid
2ga wires
MOT-B3 EZ-Go 36 Volt Non-Regen Electric, High Torque

I'm getting about 12 mph on flat ground, 9 mph going up this hill in the neighborhood, and about 18 mph when I do downhill.



First question, do these numbers seem about right for the upgrades I did?

Second question, if I put a Jakes 4" lift kit and 22" tires (I'm stock now) I believe I'll gain speed, but lose torque (-30%?), how will the lift/tires change my numbers?

It's used as a hunting buggy and I don't care that much about going fast, but I'd hate to lose torque (and I'm guessing speed) going up "hills".

Thanks,
Jdog
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Old 05-17-2013, 07:07 AM   #2
BumbleBee
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

with having the high torque motor that may be right. I am not sure how much you would lose with the lift. You can figure it based on the final gear ratio. there are calculators on line where you can punch in tire size, gear ratio etc and it will give you a new final gear and that reduction will give you an idea of the change you will see

Hope that helps.

Arin
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Old 05-17-2013, 08:51 AM   #3
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

Two things you should know.
All Electric motors slow under load.
Off road motors trade RPMs for High Torque. This results in a loss of speed.


A 33% drop in speed up hill is nothing to be alarmed at. Can you test performance on a bigger hill?
What does the battery pack total voltage drop to when you go uphill?
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Old 05-17-2013, 09:42 AM   #4
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

The best thing anyone can do is install one of Scottyb's battery meters. I just did and have learned so much about how my battery pack is performing and where. i.e. uphill...downhill....right to the floor!!....and regening when you let off the pedal. It's the best way to get instant info.
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Old 05-17-2013, 10:10 AM   #5
jdog1065
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

Thanks for the input, it does help!!
A battery meter is on my short list up future mods.

Scottyb, this is probably obvious to most, but how would I check the voltage drop going up a hill?


Jdog
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Old 05-17-2013, 11:15 AM   #6
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

You can hook up your digital volt meter to your battery pack and just lay it on the seat. I had done this pryor to installing the meter in the dash. You will need some extensions on your DVM to be able to reach it. I just used some 14 gauge wire I had laying around.
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Old 05-17-2013, 01:11 PM   #7
jdog1065
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

Before I get the extensions for the DVM, I need to get the DVM! I know, I know, I have an electric golf cart and don't own a DVM..........

I'm getting one, I'm getting one.

I'm bad with electrical stuff, but I guess it's time to get better........

Jdog
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Old 06-04-2013, 07:01 PM   #8
jdog1065
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

Well I finally got my digital ohm meter and checked my batteries today. After being disconnected from a full charge
for 12 hours. I'm at 38.0v for the pack and either 6.6v or 6.4v depending on the battery tested.

Does this sound right?

Should I try to get all the batteries up to 6.6v by charging the lower ones individually?

Next I'll test the voltage drop going up hill, but can't do that today.

Thanks,
Jdog
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Old 06-05-2013, 06:13 AM   #9
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Default Re: 1994 36v Marathon 1st Upgrades Done - Have Lift/Tire/Wheel ??

Quote:
Originally Posted by jdog1065 View Post
Well I finally got my digital ohm meter and checked my batteries today. After being disconnected from a full charge
for 12 hours. I'm at 38.0v for the pack and either 6.6v or 6.4v depending on the battery tested.

Does this sound right?

Should I try to get all the batteries up to 6.6v by charging the lower ones individually?

Next I'll test the voltage drop going up hill, but can't do that today.

Thanks,
Jdog
38.0V is only about 95% SoC (State of Charge), so you may have some battery and/or battery charger issues.

Charging the lower voltage batteries individually will help.
Once the battery pack is in better balance, charging repeatedly with little or no discharge between charges may also help bring up the the SoC it will reach.

------
Torque vs Tire Height:

I'm not 100% sure what the differential gear ratio is in a 1994 Marathon is, but if it is 12.44:1, going from 18" (stock height) tires to 22" tires will reduce torque by 18% while increasing speed on level ground by 18%.

------------
Something to consider when you replace the batteries is going to 48V.
That will more than offset the lost torque (~33% increase, so the net gain would be about 15%) and plus more speed and the system would run cooler.
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