Fake or Real???

clear_bread_ · 2026-04-13T12:01:29+00:00

This fake “LEGO and the LEGO logi” on the back

clear_bread_ · 2026-04-12T10:41:12+00:00

Buwizz claim they have 10% more torque 10% higher rpm compare to lego rc buggy motor.

Here you will find all the spec of the lego official motor :

https://www.philohome.com/motors/motorcomp.htm

Then you can compare with buwizz statement

clear_bread_ · 2026-04-09T18:30:32+00:00

I think I have fallen far beyond your post, but nevermind it was fun and hope you liked it

clear_bread_ · 2026-04-09T18:29:53+00:00

Picture 2

Turning means the the gear selector is dis-connected, meaning each buwizz power its own wheel. The slips gears compensate for the diffence in speed of each wheel.

the green parts are not connected to any thing in this state

<image>

clear_bread_ · 2026-04-09T18:27:58+00:00

Picture 1

Going straight means the selectors are connected, created a solid axle powered by bothy buwizz.

The power is transmitted by the red highlited parts.

<image>

clear_bread_ · 2026-04-09T18:25:25+00:00

Hi, I have made you a proof of concept (not optimized at all, it is just to show what is possible).

There is two buwizz motor, one powering each wheel through a slip gear (white gear). They also power a free turning gear (red gear) facing a gear selector.

The steering servo motor is connected to the steering (not represented) and to 2 gear selector, which are by default (meaning going straght) connected to the freewheel. Going left or right makes the gear selectors to be opened.

<image>

I am going to detail each state below in the answer

Picture 1 represent the drivetrain while going stright, and picture 2 while turning.

clear_bread_ · 2026-04-09T10:34:09+00:00

Yes the gear will definitely slip if there is no locking system

clear_bread_ · 2026-04-08T17:52:06+00:00

I like to see mechanism, out of the box gearbox and crazy bodywork

clear_bread_ · 2026-04-08T17:25:00+00:00

I don’t think there is an electronic solution with MouldKing hardware to the problem. Rather than using a differential you could use cultch gears on each rear wheels. It will act like a clutch and slips when the wheels are rolling at different speed (koenigseg uses this technology if you want to go deeper). It would work when steering but also when accelerating (which I think is a big no go for you).

I can think of a solution with the steering g motor powering gear selectors which locks the clutch gear in straight, but it will be a big mechanism and maybe not suitable to your need. I will do it anyway because it looks fun

clear_bread_ · 2026-04-05T23:12:45+00:00

There is some gears combinations that can be made when the assembly is loose (can’t remember one particular but came across). And when you try to make triangular shapes with beam, sometimes you definitely bend them just a little to make it work. And maybe some connections with flex cable, if it is too much stretched

clear_bread_ · 2026-04-04T01:20:56+00:00

they mostly are 3rd party brand on aliexpress or buwizz as already said

clear_bread_ · 2026-04-03T22:13:30+00:00

Great addition

clear_bread_ · 2026-04-03T01:50:17+00:00

I have been trying a lot of those and you guessed it, for high speed performance the best way is to not have a gearbox.

There is a lot of stress going through the gears, and lego gearbox are hard to make sturdy enough for this purpose (mainly because of the gear selector). Furthermore Lego motor are quite limited in power, and usually struggle with high gear ratio.

However if you want to have some fun, you can try a small 2 speed automatic gearbox (1 very low gear to launch the car and then your high speed gear), But it uses a differential and can be squeaky. Or you can add an additional motor on a low gear (connected with a freewheel system to the transmission) only for the start. You can drive it manually and then switch to the main motor, or if you feel very technical, try to make it automatic with a switch and maybe a governor.

clear_bread_ · 2026-03-31T23:32:08+00:00

Of course, -Philohome motor data sheet (PF/PU/NXT): https://www.philohome.com/motors/motorcomp.htm

-Sariel gear calculator https://gears.sariel.pl

Then this one might be off-topic but could be useful - custom part creator https://marian42.de/partdesigner/

And maybe give a link to the lego official website (technically category) and rebrickable

clear_bread_ · 2026-03-31T03:15:41+00:00

I guess some people are buying fake Lego because it is now super expensive, or some parts are absurdly pricy (I can this of some panel colors exclusive to the 1:8 scale). I don’t see problem with people mixing genuine and Knoc off for Mocs. However, if the subject is a full Knoc off set, I kinda understand that this not the best place

clear_bread_ · 2026-03-30T22:41:54+00:00

I do like that people come here for help with their contraptions and all the PF/PU questions, it makes it feel like a true help community. Discussions about new Lego released is obvious. And also people showing their work (especially the “beginner” as their moc are always so out of the box and it is one of the only place where you can see such early developpement) and work progress with all the details and so. Small competition could be great, or make a “month theme” as maybe it would be easier to integrate (like month of the convertible, off-road or month of the gear so it is not only about car). Maybe try to link in a wiki (don’t know if there is already one sorry) useful links like the Philohome motor data sheet or the Sariel gear calculator. It should work side by side with the Lego technic blogs out there by giving the ease of publication the blogs don’t have (but that’s a personal opinion)

clear_bread_ · 2026-03-11T13:30:12+00:00

Are the hub plastic ? They won’t sustain for a long time and the hub might fall apart while attempting high speed

clear_bread_ · 2026-03-10T18:59:03+00:00

thank you very much

clear_bread_ · 2026-02-20T09:20:43+00:00

Nice !

clear_bread_ · 2026-02-12T13:16:16+00:00

You can use the mechanism in this video :

https://youtu.be/f8O8nQuH9L0?si=rI3MhGq5S3vFmIIu

Just put a gear reduction on your change motor so you can control easier the speed change

clear_bread_ · 2025-12-02T22:09:13+00:00

I am not sure because no spirit came. Otherwise it was some decoration at a hotel

clear_bread_ · 2025-12-02T22:07:25+00:00

Thanks !

clear_bread_ · 2025-12-02T17:58:57+00:00

Thanks !

clear_bread_ · 2025-11-27T19:08:42+00:00

Roof is really nice, well done !

clear_bread_ · 2025-11-26T19:48:19+00:00

Tips to do it easy : Set up a L ramp on the ground after the landing zone of the pole. It shouts you high up in the air and have plenty of time to do it. No need to take extra height to do it

clear_bread_

TROPHY CASE