mp3 fit problem

[GM Canada]

Ok sorry I guess I misunderstood your last post. It seemed as if you were trimming one side to insert a washer in the other. If the trimming is bringing the valve closer to the v-brake then maybe you should be trimming from the other side. It's difficult to understand from posts only.

There are two meetups ths weekend. One at city hall the other in port credit. Do you intend to go to either. I plan on attending both. If you let me know in advance if your going I can bring one of my personal 48v batteries for you to test. If you need some extra washers I can bring some as well.

Gary

[ThunderhorseMaker]

I get about 32 Km/hr (19.8 MPH) out of my 16-inch when I lift it off the ground @48 volts.
On my vehicle I get about 27-29 Km/hr (16.7-18.0 MPH) on the flats.
If I go down a hill or pedal like a madman and get up and above 33-34 Km/hr (20.5-21.1 MPH): the motor stops consuming power entirely, and in fact starts recharging my batteries.
At speeds close to 40 Km/hr (24.8 MPH) the reverse wattage can be more than 300 watts!

[Garm@n]

Gary, thanks for the generous offer, sadly I will be working this weekend and Port Credit is too far out for me to attend.  As for the axel,  I thought about that as well, but decided the current poition of the wiring is tight already,  plus sawing around the wiring seem like a bad idea.  I don't have hands like a surgeon and the way this build is going I would cut the wies.  Anyway reading from ThundrerHorse last post, it seems my bike might travel 25-27km/h. not as fast as I would like but thats the reality of 16" wheels.  Unless connecting the mp3 to a computer and configure the settings to give me more speed.   BTW I don't see a way to connect this to a computer.  Am I missing a cable?

[GM Canada]

If you wanted to trim from the controller side it is quite simple to remove the controller. Have a look at this video.

http://www.youtube.com/watch?v=ofXCj_Dd10U

Just be sure if you do that you cover or tape over the whole so no metal fillings fall into the motor.

Gary

[Garm@n]

Thanks Gary,  I was able to file a larger opening on the one of thicker washer provided.  I personally think I should be able to widen the frame only a 1/4" more without problems.  I'll let you know shortly how that goes.  I would like to ask a question regardng the programing of the controller.  Was I suppose to purchase the USB cable to program the controller?

[GM Canada]

The USB cable is extra and available on the website. There are quite a few USB questions addressed in my FAQ

http://www.goldenmotor.ca/FAQ/categories.php?categoryid=21

Gary

[Garm@n]

I read through the faq and thanks.... So I'm guessing I doN"T need to make programing changes to the controller if the default for the MP III is set at max amp and max speed?.  But if the voltage is set to 36V (and currently my SLA test battery is 36V) does that make a difference if I buy a 48volt battery?

Edit
Okay, what is the default settings of the mp3, since my unit did not come with any paper work.

[GM Canada]

Buying a USB Cable will likely not help you for speed. I don't see any indication of how fast you are going now on the 16 inch. On a 26 inch mp3 at 36 volts you generally top out a out 32 kph. At 48 volts you go 45kph. So you generally go slightly more then one third faster.

Changing the settings of the controller makes zero difference on performance. The controller voltage setting only adjust the Low Voltage cutoff to protect your battery. Since all of my batteries are lifepo4 with built in protection having the controller set to match the battery is unessasary. I personally set the voltage on my controllers to 24v then I can run any battery on it.

The rest of the default settings are maxed out except for regenerative braking at 50 percent and acceleration at 92 percent. Niether of these will make it faster but acceleration at 100 percent would make take off slightly faster.

Gary

[Garm@n]

Okay thanks for the help.  I was hopping you would say that about the default settings.  As I didn't want to tack on 40$ plus the battery cost.  Just waiting to catch up on some more bills and it's battery time.  What would be nice for the kit would be black twist ties included.  Just a suggestion.  BTW my test battery is fairly new,  I read that SLA need to be broken in first to max the potential energy output.  If this is true.  My first speedometer test may be conservative.  You happen to know about break in periods of SLA batts?

EDIT
I am drawn to the 15A battery pack, but does it make any difference power/torque etc...  if I buy the 10A pack since I am doing 20km round trip.  I will be charging when I'm at work