Clarifying the rating of engines using the example of Kingsong KS-16X. (16XS)

Recently another unusual euc has been received at our warehouse. After riding it a bit, I decided to take it apart and see what the inside looks like.

And there it lacks one battery. This is KS-16XS 777 Whr. But that’s not the only difference from KS-16X. The wheel is declared as a 2000W euc with maximum speed of 45km/h. Is there really a different engine?

I’ve always wondered: how is it that when KS-18L v2 was switched to the new engines, the rating did not change to be 2200W, as it did with 16X. That is really strange. The engine is new, with 3cm magnets, in fact, it’s the same as the one in 16X, but its capacity is declared the same as the capacity of the previous version engine, ie 2kW.

And now I see 16XS with practically the same engine, but for some reason its only 2kW again.
We get to the controller:

And here is the key to the great mystery. We have a controller with six field-effect transistors (looks very similar to the KS-18L controller).

Version 1.2 of this controller:

16X 1554 has a v1.4 controller:

And its main difference is that it has 12 “mosfets”, not 6.

This is how Kingsong solved the problem of “overheating at increased capacity”. In other words, it is simply not possible to get as much power from the engine as it would give with the 18L controller. That’s why the second version 18L/XL with the updated engine can’t boast of the increased capacity, the firmware “chokes” the engine to make the controller work within the permissible limits.

What surprised me most is that the 777th version of 16XS seems like even a more comfortable ride.
There are no vibrations, the wheel nicely gains speed. With the the older model, it’s like it’s always trying to torpedo somewhere, even when you just smoothly roll, the wheel starts to wobble, which shoots to the legs in not a very nice way.

What conclusion can be drawn? Kingsong, as usual, is not looking for easy ways, and now we have two versions of controllers with the same engine. The 16X is equipped with the most powerful Kingsong controller, while the 18L/XL and later KS-16XS versions come with slightly clipped capacity.

By the way, one of the main complaints about 16X wheels is the enormous amount of dirt and dust inside. Kingsong did not fix the body itself, it still has open slits, but they just added some foam to the places where the most dust and dirt came from:

This way they protected the holes for the speakers and the cavity under the pedal stand, which already has a decent amount of dust:

From one side they glued the below foam strip instead of the missing speaker:

Unfortunately, this does not improve the situation with waterproofing 16X, which leaves much to be desired: So be careful, and if possible, order professional waterproofing for the whole wheel at once.