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Old 12-05-2013, 05:59 PM   #1
azTony
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Default Something apparently is robbing my RPM's. HELP!

Ok, I had a 36V system to start with and I upgraded the the controller to an ALLTRAX SPM-48500, 2GA cables (all of them, kit from ScottyB), HD solenoid and HD F&R switch. With this combination I was running 23mph on the engine I "had".

I talked to Robby at PQ and he built a custom motor for me and during the install I also changed to new 48V Trojan Ranger 160's and went to the HD refersing contractor Scotty is selling. With the new combination I am getting.... 23mph.

So after many conversations with Robbie and nothing wrong with what he builds he suggests there is something wrong with my cart. Giving him the benefit of the doubt (and I sold my existing motor) I am reaching out to you all to help point me in the right direction on where to look.

Robby said that I should measure the battery pack voltage at rest and then again at full throttle while driving it. I have Scotty's digital meter on my dash so correct me if I am wrong but wouldn't that give the same reading? I get the same reading while at rest.

I am kicking myself for not doing the upgrades and using the existing motor "then" change the motor. I am very disappointed.

Suggestions on where to look would be much appreciated.
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Old 12-05-2013, 08:17 PM   #2
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Default Re: Something apparently is robbing my RPM's. HELP!

hmmmmm no.....the voltage reading with the cart at rest and at full throttle going down the road will NOT be the same.....or shouldn't be.....at rest will be higher.

but what gets me......is you want from 36v to 48v and it runs that same speed?? that is not right, or shouldn't be.....but like you said.....since you changed out the motor as part of the upgrade to 48v....its hard to tell. as your new PQ motor must make more torque, at the expense of speed. so now you are going the same speed as before, but you must have a lot more torque. That's my guess.
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Old 12-05-2013, 08:51 PM   #3
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Default Re: Something apparently is robbing my RPM's. HELP!

I did not word that correctly, obviously the voltage reading will be different from a rest than at full throttle. What I meant was instead of going through the trouble of hooking up a pigtail to the battery pack and drag out from under the seat to read while driving, I could just read the dash gauge "because reading should be the same"

Sorry for the confusion.
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Old 12-05-2013, 08:53 PM   #4
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Default Re: Something apparently is robbing my RPM's. HELP!

Quote:
Originally Posted by azTony View Post
I did not word that correctly, obviously the voltage reading will be different from a rest than at full throttle. What I meant was instead of going through the trouble of hooking up a pigtail to the battery pack and drag out from under the seat to read while driving, I could just read the dash gauge "because reading should be the same"

Sorry for the confusion.
This is correct.....that is exactly what I do.....use the in-dash meter for full pack readings.
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Old 12-05-2013, 08:56 PM   #5
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Default Re: Something apparently is robbing my RPM's. HELP!

He did not elaborate in his e-mail but it sounded like the voltage should be the same but I know that would never happen.

Thanks for the quick reply.

Any other thoughts about what to check?
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Old 12-05-2013, 09:11 PM   #6
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Default Re: Something apparently is robbing my RPM's. HELP!

You need to get a laptop and usb cable (from a printer) on that SPM controller and verify with the cart on jackstands that the throttle settings are achieving 100% throttle. I'll almost guarantee it isn't and needs adjusted in the software.

You'll need to download the software and instructions here:
http://www.alltraxinc.com/Products_SPM.html
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Old 12-05-2013, 10:40 PM   #7
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Default Re: Something apparently is robbing my RPM's. HELP!

on top of that. there are a few other settings that need or should be changed since you just went from 36v to 48v. AND you need to get new higher ohm Pre-Charge Resitor for the Solenoid as well.

I sent Scotty an email awhile back and ask the pointed question as to what all I needed to change in the setting in my controller, you and I have the same controller. Here was his response.

"You just need to change voltage parameters. It’s personal preference, Ask anybody and you get a different answer. But I want my controller to drop out if my 48v pack hits 34v . At that point the amperage draw will be seriously high enough to melt something. And I want it to run hot off the charger too if needed..... so I max the voltage = 60v

Hope this helps

Scottyb"
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Old 12-06-2013, 06:09 AM   #8
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Default Re: Something apparently is robbing my RPM's. HELP!

Like the others have mentioned, make sure you controller is programed right.

As for the dashed mounted DVM battery meter vs a handheld DVM:
Unless both leads going to the dash mounted DVM battery meter are connected directly to the battery pack without interruption, you are not actually measuring battery pack voltage. IE: If you are using the switched leg of the keyswitch the feed the meter, the voltage is being sense through 3 sets of switch contacts connected in series by 4 separate lengths of wire with 8 separate connections.

Does the Gerrymandering of the Battery voltage sensing path matter?
Maybe so, maybe not. Need to compare against a handheld DVM to find out.

----------
If the problem isn't controller programming, and nothing except the motor is getting too hot to touch, I'm going to take a leap of faith and guess the rolling resistance of tires is why the speed didn't increase when the pack voltage increased.

What is the tire height and what is the Max air pressure rating on the sidewall?
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Old 12-06-2013, 06:21 AM   #9
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Default Re: Something apparently is robbing my RPM's. HELP!

@Sir Nuke Great points and I had covered them. WHen I bought everything from Scotty I told him what I was doing in the future and he set me up with both resistors.

I also had a new ITS and I put it in since Robby had me check the adjustment there which was off quite a bit. His adjustment method is different than EZGO's. He says at full throttle the shaft should protrude past the hole opening at "least" 1/8" which I adjusted it to.

@JohnnieB The DVM is wired directly to the battery pack with nothing between and on all the time so I can see at a glance at any time the voltage.

After I adjusted the throttle and replaced the ITS with the new unit I removed the throttle setting in the programmer but could not find how to adjust it. From what I read it does an automoatic adjustment? I am also not clear on how to see if it is getting 100% throttle. I will need to dive into it more tonight.
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Old 12-06-2013, 07:15 AM   #10
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Default Re: Something apparently is robbing my RPM's. HELP!

Battery Meter wired direct.

If you cleared the throttle Auto-Call, it should automatically determine what the new 0% and 100% set-points are.

Unless you can figure out how the LED on the controller while driving, put the rear of the cart on jackstands and lift/remove the seat.
For no more than a few seconds, push the pedal to the floor while tires spin in the air.
The LED will turn from green to yellow if the controller is sensing 100% throttle.

---
That is about the same way I adjusted my ITS. Plunger slightly protruding through sensor coil with pedal on floor, than adjust microswitch collar so the solenoid activates before the plunger enters the coil.
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