41MPH EVG SX bike with Magic Pie motor

[ohzee]

Love the bike looks very clean.

I agree the motor seems to match well.. Looks like an awesome place to put your batteries.

[snellemin]

Thanks Ohzee.

[migueralliart]

Thanks Ohzee.

U motivated me to get one as well .... DAMN ebike grin man.

[snellemin]

Thanks Ohzee.

U motivated me to get one as well .... DAMN ebike grin man.

Post pics!

[migueralliart]

Here you go its a PE 36v



And started a thread for recommendations...

viewtopic.php?f=2&t=38064

[o00scorpion00o]

Very nice clean build snellemin!

here is a reply to the other thread I didn't want to hijack.

What gauge wire did GM hook up to the external controller pie ?

I rewired it with 12g alpha ecowire. Brilliant stuff with a really thin insulation so it has no problems taking the modded 12 fet lyen.

I see the attraction to higher voltage setups, and it's interesting that the throttle response is smooth at those voltages.

My throttle on 100 % is very jerky, not surprisingly since it pulls 80amps 120 peak from start! It is better though at about 50%

I wish the cycle analyst would limit current quicker as you still get a large surge of power for a second or 2, in fact I would rather the controller have the option to limit current via the speed switch as well as speed, it would help to relax the throttle more.

At 80 amps the pie has no problems with the monster grades in the woods, they are short enough but very steep. 30% + in places, so I need to run 80 amps 120 peak into the pie. But it climbs them brilliantly!

BTW I just thought, in the other thread where you said the controller kept cutting out on full throttle on 24S, is it still doing that? But I was thinking maybe your lvc is set too low ? did you get the formula for the lvc from lyen ?it's different from the software settings.

What is your controller to motor phase combinations and I'll check that against mine to see if it gets rid of the god awful vibration I keep getting.

Maybe over the weekend I'll rewire my 16S 2P for 24S for some fun, but I would have to back off the current to about 40 amps because I'm using 20C zippy's! 8C shouldn't be too hard on the little 5ah bricks!

[snellemin]

The wires that the motor came with looks like 16 awg. So I ran 12awg wires all the way to near the motor and called it a day.
On 50% speed settings the bike pulls around 7A and 100% speed setting around 27-28A at max throttle. I've seen peaks between 70-80A on the CA.

The CA can control the spikes better if it directly controlled the controller throttle. You would have to wire your throttle to the CA and from the CA to the controller. But I'm not bothering with that untill the new CA becomes available.

My controller has no issues with 100% throttle at HV doing 45mph. Motor wire combination is random with me as it's sensorless. I only swap two wires to change direction. There is no magic wire color combination for me.

I hope you can figure your issues out.

BTW, I did not get the formula from Lyen regarding the LVC in the controller. Anything special there?

[o00scorpion00o]

I think the formula depends on the resistor Lyen uses ? maybe you should ask him unless you need the controller lvc, but it could be the cause of it cutting out on you at higher voltages ? though on fully charged batteries it should not matter, unless they sagged a lot ?

But without doubt the throttle is much smoother using half the current, and it's not nearly as noisy at slow speeds either, but it surely doesn't accelerate like on 80 amps!

I think a 18 fet would be better for 40-45, still it is good, I'm just used to higher torque!

You are doing 45 on 24 S and I only got 40, might be the 5ah 20c zippy's ? they were very warm when I got back.

One thing I really love about lipo is the fact you can configure it any way you want!

[snellemin]

Lipo's are great. Just finding good ones is iffy at times. I don't understand the big deal with Nanotech batteries. They are not the greatest thing in the RC hobby. They puff up sooner vs cheap 40C lipo's like Gensace. I have abused my lipo's and they take a bit longer to balance out now. But what else do you expect after draining them in less than 5 minutes.
My two 20C 6s1p packs that has only seen Ebike duty, balance out the fastest. Bike doesn't even give the batteries a workout, but they do drop the most voltage under load as expected from a 20C cell.
My next set of ebike batteries will come from FMAdirect, which are the 60C 6s1p batteries. Good prices and a 60 day warranty. But I need to save up some to buy 8 of them. Goal is to have 24s2p or 12s4p setups with barely any voltage drop. BTW, I charge my cells @4.15V per cell for ebike use, which average out between 96-98% capacity.



I'm riding the Critical Mass in Houston tonite and set the bike up for 15s2p. I also added a cheapy H3 LED light bulb in the stock headlight of the bike, which runs of 18650 cells @4s1p. If I want 5 minute recharge times, I swap in the 4s1p A123's. It makes for a good daytime driving light I think. It's still not as bright as my Ebay Magic shine lights.

[boppinbob]

Nice build. Love the ebike frame. Hope to get lucky one day and find one to buy. PS I live in Jersey Village on the nw side of Houston. I'll bet I don't live more than 10 miles from you. My wife and I really want to ride with Critical Mass. Might even see you there next month.

[snellemin]

Coolbeans man. Looks like we are about 10-12 miles away from each other. Critical Mass is fun. I missed the CM yesterday, but still got to ride with some other folks on a different route for 16 miles. I'll be at the next one for sure and would be nice to have another ebiker in the group. Hit up the Houston Critical mass on Facebook.

[o00scorpion00o]

Lipo's are great. Just finding good ones is iffy at times. I don't understand the big deal with Nanotech batteries. They are not the greatest thing in the RC hobby. They puff up sooner vs cheap 40C lipo's like Gensace. I have abused my lipo's and they take a bit longer to balance out now. But what else do you expect after draining them in less than 5 minutes.
My two 20C 6s1p packs that has only seen Ebike duty, balance out the fastest. Bike doesn't even give the batteries a workout, but they do drop the most voltage under load as expected from a 20C cell.
My next set of ebike batteries will come from FMAdirect, which are the 60C 6s1p batteries. Good prices and a 60 day warranty. But I need to save up some to buy 8 of them. Goal is to have 24s2p or 12s4p setups with barely any voltage drop. BTW, I charge my cells @4.15V per cell for ebike use, which average out between 96-98% capacity.

I think you found a nice balance between speed, power and throttle response for normal road use.

By the way, what isyour total watts on acceleration ? mine is about 2900 watts, about 33 amps on 24S. It is decent and smooth, but at about 50-55 amps on 24S the acceleration is really good, you should try it if you haven't already.

Only thing is the noise and vibration come back so I have to be easy with the throttle.

The zippy's get very warm and are 20 C I thought they should not be so warm at only 33-34 amps, maybe 50 peak ?that's only about 6 or 7 C average on acceleration at 34 amps ?

[snellemin]

My controller is set for 50A battery power and Watts get pretty high at takeoff. You can see my controller setting at the beginning of the this thread.

To me, 20C is bare minimum for my liking. Mine do get a slightly warm after a commute, which is why I'm going with the 60C setup in the future.

I can only imagine if there was a 18Fet or 24Fet sensorless controller to mess around with.

[o00scorpion00o]

From the software pic it says 50 amps battery, That would mean 4500 watts on acceleration.

But what I want to know is that your actual or peak as one of your posts said 29-30 amps on acceleration which would mean 2700 watts on 24S. Because I've discovered the problems I'm having are just before 3kw on either 16 or 24S, and it's driving me crazy!

[snellemin]

Aaah, that 27A was continuous load at max speed on 24s.

[neptronix]

I'll tell you a secret about the 20C Zippy packs.
They are more like 10C in reality

IR ( according to the iCharger ) is double versus the 20C Turnigy packs.

Their strength is that they are smaller and lighter. You're best off running a higher amount of amp hours and lower C, like 5C or less continuous/peak.

[o00scorpion00o]

Okay so you are seeing about 4500 watts then on acceleration ?

That is really weird, I think I give up!

Actually I reversed polarity on my controller today, stupid mistake!

I created a thread in e bike technical, to see if the controller is toast!

[o00scorpion00o]

I'll tell you a secret about the 20C Zippy packs.
They are more like 10C in reality

IR ( according to the iCharger ) is double versus the 20C Turnigy packs.

Their strength is that they are smaller and lighter. You're best off running a higher amount of amp hours and lower C, like 5C or less continuous/peak.

Hey Nep, yeah I think 10C is a more realistic rating alright, I think HK need to re rate the Zippy's!

I was using only 5ah because I was testing the pie on 24S, I don't have enough LiPo for 2P But will go back to 16S when my mac parts come.

[snellemin]

My bike actually pulls around 6000W on acceleration and cuts off after a few seconds if I don't go gentle with the throttle.

[o00scorpion00o]

My bike actually pulls around 6000W on acceleration and cuts off after a few seconds if I don't go gentle with the throttle.

That's strange, all I get is 3kw even with a modded controller and soldered shunt !

Sure I can pull 5kw but I have to be careful with the throttle which is a pain in the ass.

So yours cuts out at 6kw and mine goes mad at 3kw, grgrgrgrgrgrr head exploding!

[snellemin]

I can see the frustration, especially when my controller is bone stock. The CA shows a peak of 79A today.

[snellemin]

46mph!

[o00scorpion00o]

46 mph, Getting clost to the 50 mph club!!!

Was that with the same battery and phase currents ?

[snellemin]

Yup, that was with the same phase current and batts. Dunno if the bike can hit 50mph though.

[o00scorpion00o]

Yup, that was with the same phase current and batts. Dunno if the bike can hit 50mph though.

I seriously can't understand what the fack is going on with my set up, same motor, same controller. I think my head is going to explode!

So what are you seeing again on acceleration ?

And you mst have had throttle turned to 100% ?