1.2 vs 2.0E motor

[Stefan Mikes]

Glad to have that confirmed. I’m also glad I trust you guys…otherwise I would have thought ppl were just quoting the 2ishx factor spécialiséd gets when they divide 320W by 135W(their so called typical rider).

I was very much interested in all those technical details until I discovered I really preferred riding to calculating the performance What still matters to me is a good understanding of the available battery range; I also need to calculate the available power and gearing for very steep climbs, that's it!

By the way, I think Jeremy has found the "typical rider" as one who can muster 144 W leg power to saturate the motor.

 

[Jeremy McCreary]

By the way, I think Jeremy has found the "typical rider" as one who can muster 144 W leg power to saturate the motor.

Never said anything of the sort. Please don't put words in my mouth.

 

[Stefan Mikes]

Never said anything of the sort. Please don't put words in my mouth.

Apologies. I'm not your enemy, Jeremy. If I said something incorrect, it was not directed against you, just the appreciation of your hard work.

I think you have calculated that value as always saturating the motor in TURBO?
It is Bosch that defines a "typical rider". Bosch thinks a "typical rider" is weaker than 144 W

 

[stompandgo]

Incorrect. Bosch makes a range of full power drive units from 40Nm/586w/340% assist to 100Nm/780w/400% assist. That should cover the range of riders from "weak" to "winner".

Stefan, your Bosch Derangement Syndrome is too much sometimes.

 

[Stefan Mikes]

Incorrect. Bosch makes a range of full power drive units from 40Nm/586w/340% assist to 100Nm/780w/400% assist. That should cover the range of riders from "weak" to "winner".

Stefan, your Bosch Derangement Syndrome is too much sometimes.

Stomp. Divide the rated peak power of a given Bosch motor by its max boost factor and let me know what the rider power would be, please.

 

[Rás Cnoic]

Stomp. Divide the rated peak power of a given Bosch motor by its max boost factor and let me know what the rider power would be, please.

DING DING round two...

 

[stompandgo]

Not playin'.

 

[Stefan Mikes]

OK, let us revisit the past when Specialized was gladly publishing the Boost Factor B of its motors.

My 2022 Turbo Vado 4 Review.

I go up a big hill by my house all the time at the equivalent rear wheel torque of the Vado 4 in turbo (on my Tero X, accounting for assist level and gearing) and it's fine. The main difference would be that my own pedal input is easier because I would be in a lower gear. If you want speed on...

forums.electricbikereview.com

Vado 5.0: 560 W peak power (mechanical), Boost factor 4.1x
Vado 4.0: 470 W peak power (mechanical), Boost factor 3.2x
Vado 3.0: 430 W peak power (mechanical), Boost factor 2.8x
and also
SL 1.1 motor: 240 W peak power at Boost factor 1.8x
SL 1.2 motor: 320 W peak power at Boost factor 2.3x

We could use Jeremy's interactive calculator at E=M=100 and then calculate the Prs. Or, simply divide the peak power by Boost factor.

2.2 motor: Prs = 137 W
2.0 motor: Prs = 147 W
2.0E motor: Prs = 154 W
SL 1.1 motor: Prs = 133 W
SL 1.2 motor: Prs = 139 W.

While there is no "typical rider" here, the rider's power to saturate the motor in TURBO remains similar to one another. One might speculate why the Boost factors were removed. Perhaps because they were just marketing values and as such those were worthless?

On the other hand, Spec has no issue to publish the peak power of its e-bike motors, which might draw the attention of the European lawmakers in the context of the "power war" between DJI, Specialized and Bosch. Bosch E-Bike was very cautious about giving the peak power figures of its motors in the past not to highlight the fact the rated legal 250 W continuous power was fiction... Now, it has changed?

P.S. I still own the EU Type Rating document for my Vado 6.0 individually issued to each and every S-Pedelec (a moped) the brand ever made. The Boost factor listed there is 3.2x. And...

Additional information: I used to watch many videos from the YT channel dr-e-bike, https://www.youtube.com/@drebike The man is a real Bosch E-Bike expert, who explained, for instance, all Bosch Assist Modes in a single video, One of his programmes was about Bosch E-Bike motors. The man could prove there was a "typical rider" for whose leg power the brand calculated the Boost/Assist factors.