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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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03-19-2018, 09:47 AM | #1 |
Not Yet Wild
Join Date: Mar 2018
Posts: 4
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Ezego RXV brake problem
I have an ezego rxv 2012 that has a major problem with the braking system. Once the brake is press it stops but then goes back about 2 feet and settles there. It never stays where you press the brake. I have had people almost run over as the cart backs up. Any help please
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03-19-2018, 09:57 AM | #2 |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: Ezego RXV brake problem
You probably have a Rxv with Curtis controller and high speed gears. This problem is why I avoid high speed gears in Curtis Rxv. How fast does your cart go? Is it a retired golf course rebuild? Do any of the badges say "Freedom"? If my hunch is correct, only solution i have found is get rid of high speed gears, and get speed with freedom mode instead.
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03-20-2018, 10:22 PM | #3 | |
Not Yet Wild
Join Date: Mar 2018
Posts: 4
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Re: Ezego RXV brake problem
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03-21-2018, 02:54 AM | #4 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Ezego RXV brake problem
Quote:
The cure is to go back to stock gears and no larger than 20.5" tires, then use Freedom Mode to get the speed. The RXV is unlike common golf carts. The AC drive motor is the only brakes you have while driving. In order for them to be effective, the motor needs the correct mechanical advantage. That is the determined by the final gear ratio. Actual gear ratio in the rear end plus the tire diameter. I almost made the same mistake after buying my first RXV. The new high speed gear set I bought is still sitting in a box here. I listened to cgtech, and am glad I did. He has RXV experience that I did not yet have. My experience was with controllers, road driven Electric Vehicles, and older Series golf carts. RXVs are unique. |
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03-21-2018, 03:55 PM | #5 | |
Not Yet Wild
Join Date: Mar 2018
Posts: 4
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Re: Ezego RXV brake problem
Quote:
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03-21-2018, 09:03 PM | #6 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Ezego RXV brake problem
Quote:
It is a fairly common problem with cart owners. People like the looks of larger wheels and tires on carts so much that they often put them on without knowing what it does to the functionality of the drive system. The RXV does not have physical brakes at the wheels, so it is double prone to issues caused by effective gear ratio changes. Increased motor current required to accelerate is common to all carts, but braking effectiveness being reduced affects the RXV more than any other cart. With more speed, you need more braking effectiveness, not less. The proper way to speed up an RXV is to use Freedom Mode and to up the top speed setting, not to go with high speed gears. The RXV has a 16.99:1 gear ratio rear axle, and the lowest gear ratio intended to be used in the AC drive axles is in the 2Five. The 2Five is a road legal version of the RXV, and they added physical disk brakes to help with braking and to meet DOT motor vehicle safety standards. It also has a VCL (Vehicle Control Language) that is set up for its 14.99:1 rear axle gear ratio and 18" tires. If someone wants to go with much larger wheels and tires on an RXV, they may need to consider changing out the rear end gears for a set with a higher gear ratio to compensate. This is why changing to tires up to 20.5" can be within the acceptable range for stock gears. More than that and the E-Z-GO factory VCL in the controller is too far outside of it's designed operating range. The motor RPM vs actual MPH is changed, and the controller cannot compensate for that without recalibration. Even if recalibrated, current draw increases due to increased torque loading. It affects speed regulation, which becomes more erratic. And that is exactly why the brakes start behaving erratically. The RXV is essentially a computer on wheels. It is more sensitive to sensor input changes than E-Z-GO Series or SepEx carts. Suddenly it finds its speed and current sensors telling it that it is going slower, yet drawing more current, and it has not been reprogrammed to interpret the changes. I hope that I was able to help you understand the issue. If not, maybe cgtech can explain it in a less technical manner. Bob |
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03-21-2018, 09:23 PM | #7 |
Not Yet Wild
Join Date: Mar 2018
Posts: 4
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Re: Ezego RXV brake problem
bob, thanks for your help. at the moment i have replaced the low profile tires with 10” 65 tires for a,smoother ride. is there any fix like adding physical brakes that will work if i leave the gears the way they are.
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03-21-2018, 10:41 PM | #8 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: Ezego RXV brake problem
Quote:
http://www.buggiesgonewild.com/road-...ml#post1375913 |
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