Precedent MCOR issue or Something Else

[Lrbergin]

I have a 2007 Precedent 48v with an Alltrax XCT400 and I installed a PQ Executioner over the weekend. I loaded the field map for the Executioner that I got directly from Alltrax and all is well for the most part. Took it out for a spin and with the GPS speedometer app I’m getting between about 25-27 MPH. This seems a little slow for the setup but maybe it’s on par with what others are getting? Tires are stock and inflated properly and I don’t believe I have any break drag from what I can tell and bearings seem to be ok. One thing I did notice is that on flat(ish) ground and petal to the metal I could feel the motor starting and stopping intermittently once I got it up to it’s top speed. I’m by no means an expert at this stuff but form what reading I have done I believe it to be an MCOR issue. I didn’t notice it before with the stock motor so not sure if it’s just very coincidental timing with the MCOR or possibly something else I am overlooking? Not sure what other information would be helpful, but pack voltage 51 and change. Any help is appreciated.

[mrgolf]

Could be you are reaching your rpm limit you have set.

[Lrbergin]

Originally Posted by mrgolf

Could be you are reaching your rpm limit you have set.

I was thinking that as well. My question then would be, what else should I look for that could be holding me back on speed? I’ve got 400 amp controller, executioner motor, heavy duty solenoid, newer batteries, and 2ga cables.

Maybe I need to double check the bearings and brake drag. Alignment seems ok but I should probably measure it. Probably should change the rear end oil as well while I’m at it.

[Sergio]

25mph-27mph is approximately 6,000rpm with stock sized tires, what did You set for your RPM limit in the Alltrax?

[Lrbergin]

Originally Posted by Sergio

25mph-27mph is approximately 6,000rpm with stock sized tires, what did You set for your RPM limit in the Alltrax?

6500 is what I was told by PQ to set it at.

[Sergio]

You can log the data in the Alltrax software during a full speed run to verify the max RPM reached, but it looks like your are at the RPM limit you imposed.

[Lrbergin]

Originally Posted by Sergio

You can log the data in the Alltrax software during a full speed run to verify the max RPM reached, but it looks like your are at the RPM limit you imposed.

I'll try that. I need to get a new cord as the one I got off amazon disconnects sometimes.

Assuming I'm reaching max RPM, what would cause it to average 26 MPH? Seems like I should be getting more out of that setup but maybe my expectations were just too high.

[Sergio]

Yes, that is the speed you get with the stock differential gear ratio of 12.315:1 and stock size tires, approximately 17.5" tall.

You can place those numbers in the speed calculator to verify, it is located in the tool bar under "Quick Links":

https://www.buggiesgonewild.com/speed-calculator.php

[Lrbergin]

Originally Posted by Sergio

Yes, that is the speed you get with the stock differential gear ratio of 12.315:1 and stock size tires, approximately 17.5" tall.

You can place those numbers in the speed calculator to verify, it is located in the tool bar under "Quick Links":

https://www.buggiesgonewild.com/speed-calculator.php

Tires are 18.5" so by that estimate I should be getting 29.1 MPH I believe.

I've just been reading other threads with guys getting lower 30's with the same set up so I figured something is out of wack.