ezgo shuttle going slow (7 MPH) with new batteries, controller, speed sensor, etc

[UFGatorcart2013]

I have a 2003 TXT PDS Shuttle with your exact set up mechanical wise besides i have stock motor. My cart was doing the same thing getting 7 mph max, went in controller and disabled the speed limit and now max is 26 mph. I also have lift and bigger tires.

[cclements716]

I still have the stock motor. I am interested in what an upgrade but staying within the 400 amps would be. I think that my motor maybe nearing the end. I can hear the bearings start to whine.

[JohnnieB]

Originally Posted by cclements716

I do have the stock tires. According to the rear end it is a 14.76:1 ratio.

Stock tires are labeled 18" tall, but the numbers stamped on the sidewalls are very approximate, have you actually measured them?

My tires are labeled 18", Carlisle's website says the mounted diameter is 18.3", they measure 17 tall with a level and yardstick and they have a rolling diameter of 17.04".

Thanks for the exact gear ratio. EZGO published specs list it as 14.7:1

21MPH with 14.76:1 gears and 18" tires is 5788RPM rather than 5765RPM.

When you get your speed sensor fixed and the motor RPM starts showing up on the data logs, you can insert a column next to it and divide the motor RPM by 275.631 to get cart speed in MPH. Which can be refined more with whatever your cart's exact tire height is.

[JohnnieB]

Originally Posted by UFGatorcart2013

I have a 2003 TXT PDS Shuttle with your exact set up mechanical wise besides i have stock motor. My cart was doing the same thing getting 7 mph max, went in controller and disabled the speed limit and now max is 26 mph. I also have lift and bigger tires.

Does your speed senor work????????

The cart ought to run faster with speed limit enabled.

I know my 2008 TXT PDS with a XCT48400-PDS controller only runs about 3/4 as fast without the speed limit enabled. Maybe the XCT48400-OEMG19 works differently. Could be an issue that needs to be forwarded to Alltrax.

[JohnnieB]

Originally Posted by cclements716

I still have the stock motor. I am interested in what an upgrade but staying within the 400 amps would be. I think that my motor maybe nearing the end. I can hear the bearings start to whine.

I'd wait until you get the speed sensor fixed and any changes in tire size, if you are planning to do so, then determine if a different motor is needed.

It appears that the stock motor might be doing a fairly decent job for speed and torque with stock height tires. Maybe the existing motor just needs a good cleaning, new brushes and new bearing at your local electric motor shop.