Q100/EB306 Current Settings

[jackhandy]

With a decent tail wind you don't want streamlining - You wants a Kite!

Speaking of which - Haven't heard from Cwah lately: Hope his brolly didn't drag him under a bus

 

[Marctwo]

I tried 120% this morning and it cuts in like a turbo boost without load. But when I got out on it... nothing!

Being mounted as a crank drive, my motor doesn't build up enough speed to activate the turbo. I'd either need to fit a smaller drive cog to the motor or pedal at 150rpm.

 

[Deleted member 4366]

Being mounted as a crank drive, my motor doesn't build up enough speed to activate the turbo. I'd either need to fit a smaller drive cog to the motor or pedal at 150rpm.

Could we see some photos?

 

[Marctwo]

It's not pretty (yet) but it does the job.

 

[Deleted member 4366]

It looks pretty to me!
Where did you get those frame clamps?
You should have done a build thread on it. Other people might want to copy it. Is it the 201 rpm motor and what size sprockets have you got on the motor and the crank?

I can see what you mean about the 120%. It only gives more crank speed, not more torque, so you can't realise its advantage

 

[Old_Dave]

Where did you get those frame clamps?

Looks like half swivel scaffolding style ?

 

[Marctwo]

Cheers Dave.

For the clamps, search 'truss clamp' on ebay. I'm lucky with this frame as the downtube is 50mm.

I did order the 201rpm motor but it spins way faster than that unloaded. Being new to this game I wouldn't know if that's normal or not.

The chainwheel is 48t, the drive (motor) cog is 18t and the freewheel is 7spd, 11t-30t. I matched all the numbers to give me a comfortable peddal speed @30mph... not that I spend much time at 30. lol.

I may do more of a post-build thread when I get a bit further with it.

 

[Deleted member 4366]

The motor will run faster than 201 rpm because, you voltage is higher than 36v (42v off the charger), so I'd expect 42/36 x 201 rpm = 234 rpm.

I used a Bafang 201 rpm for mine with 14T on the motor sprocket and 42T on the crank, which felt about the right cadence. Using average 39v, cadence would be 201 x 14/42 x 39/36 = 72 max with good power at 60.

Yours is 201 x 18/48 x 39/36 = 82 max

Changing the motor sprocket to a smaller one will reduce the cadence without changing the power or the gearing on the bike; however, peak power is made at about 2/3 maximum rpm, which would be about 55, which is right where you can add most to it, so looks like you got it right, but it'll out-pedal you in the lower gears.

 

[Marctwo]

Without load my wheel hits a topspeed of ~45mph. This would suggest a motor speed of ~380rpm if my math is right. It may also suggest that I was sent a high speed motor.

Pedal speed works quite well in the real world. With a slow cadence, the motor is working hard so I change down. With a fast cadence I have enough speed to change up into a comfortable cadence. I'll normally cruise at 20-25mph pedalling at ~75ish. That's about where the motor sounds/feels at it's best. Of course, I have a 3 speed switch for cruising at slower speeds.

 

[Deleted member 4366]

I take it the 45mph is with the high position on the three-speed switch. My calculation says that a cadence of 82 is about 27 mph, but maybe your motor isn't 201 rpm at 36v.
I had a 350w Bafang CST as a normal hub-motor that span with no load at 18mph without the switch and 33mph with the switch in the high position! It didn't feel any different on the road though.

 

[Marctwo]

Yes, 45mph @100%. And yes, 82 would be just under 27mph but my motor won't quite do that without a tail wind... or a hill... or a bit of effort from me but that's getting a bit silly now. lol.

 

[Marctwo]

Managed to get the turbo working.

Opened the throttle in 1st and at 100% I got upto ~14mph, Switched to 120% and felt quite a surge as the turbo kicked in. Got upto ~18mph, that's close to 30% increase.

Couldn't get it going in any other gears as I can't get the motor spinning fast enough to activate it. I may try some smaller drive cogs at some stage though just to see how useful it really is. I wouldn't expect a 30% increase @25mph but I'd be surprised if it didn't get an extra 2 or 3 mph.