E Bike Tuning: Bosch CX der Alpha Motor – RedPed Chip

E Bike Tuning: Bosch CX der Alpha Motor – RedPed Chip


Dear e-bike tuners, I want to share my experiences with the Bosch CX motor. What makes it special: Even with extremeley high pedal frequency, you still have torque, so there is no limit, so to speak. No matter how fast I pedalled, I could not get it to stop its assistance. With the Steps E8000, the limit is 115 rpm, with the Yamaha approximately 100 rpm. In addition, the torque is stable, from the start to the end, not, like with the Yamaha, a very high torque with low pedal frequency, and then it gets lower. With Bosch it is stable from the beginning to the end, so it is reliable, you can count on it. Furthermore, it has a small chainring in the front. With the chainring that I have, I can drive 40 or 45, which is a bit stressful, or 50 if I try hard. You can change the chainring to get 20 sprockets, and then you can easily drive 60 But then, the battery will be empty after 25 km. The Bosch CX motor has a CAN bus with three participants: display, battery, and control unit. Each component has its own firmware, which you can update or readout at the e-bike retailer if there are errors. Unfortunately, only at the retailer, which is a disadvantage. I don’t know why they don’t give the customer this possibilities because there is not much to change Apart from the possibility to switch the light on or off, you cannot change anything, not the wheel circumference, nothing. There are much accessories, different displays, high-quality in general, and very solid. When it is built into the frame, everything is great, but for tuning, the Bosch system is not very suitable because there is a plausibility check regarding the speed, so that error 503 or 504 may occur. Bosch has announced to prevent tuning in 2019. Furthermore, the CAN Bus is very complicated, a lot of data which is transmitted, I don’t know if this is really necessary. Because of this, it gets complicated and there are updated. If they are evil, they could change something in the CAN Bus, and then the modules wouldn’t work anymore. But that would apply to all modules, probably. So much regarding the tuning. What makes the Bosch CX motor rather unalluring for me is this ugly high frequency noise of the motor if the pedal frequency is high. I the e-bike is not tuned, you realize that it is very loud if you drive up a mountain using a small gear and if the e-bike is tuned, if you drive 40 or 45, it is as loud. You can improve it by using a bigger chainring, then it becomes more quiet. Furthermore, the motor resistance is extremely high with the Bosch and that is like driving against a wall. Then the assistance stops abruptly, there is no transition, like with the Yamaha. But I am curious what Bosch will issue in 2019. My advice is that, if you want to tune your e-bike, then Bosch is not your first choice, even if there are thousands of tuning chips for it. A large variety, but in my view, there are other, closed systems, which have no plausibility checks and no complicated CAN bus. There are better, simpler systems. Bosch is an allround motor and you don’t need it, it is not the best motor. If you look at the displays by Yamaha, Haibike Yamaha, they are terrible, Giant is a bit better in this regard. Then there is also Shimano with an OLED display, then there is Brose and so on. But the Bosch displays are very good, and if you really need navigation and calories and driver performance, then Bosch is the first choice, but if you just need a simple e-bike that can drive fast and that is just reliable, then you don’t really need the Bosch. I have driven the whole day and want to show you the data now Maximum speed was 52 kilometers per hour battery charge is 15, not 45, 15, I have already recharged it. The total driving time is one hour and ten minutes, average speed was 30 kilometers per hour and I lost 2.2 percent of the battery charge every kilometer on average and I have a remaining reach of … unfortunately, it reads 20, but I had a remaining reach of seven kilometers and I have burned 380 large calories Average driver performance was 115 Watt and the total distance was 40 Kilometers, which means I had approximately 45 kilometers to go until the battery was empty, using Turbo and full throttle. I use to drive quite fast, as fast as possibly. So if the bike is tuned, depending on your driving habits, mountains up and down – you can reach 45 kilometers, 500 watt-hours, this is how far you can go with it. Maybe you can go further if you use a different profile or if you are living in the plain.