Super fast LEGO Technic 42077 Rally Car RC mod with Buggy motors & BuWizz

Please welcome my latest & fastest remote control modification of the great LEGO Technic 42077 Rally Car:


– Rear wheel drive by 2 coupled RC Buggy motors using the fast output
– Fake engine is also working
– Steering by a Servo motor
– Powered/Controlled by 2 BuWizz units

WARNING – This is a very powerful RC modification. The 2 RC buggy motors powered by the BuWizz units can potentially damage the plastic components. Make sure to test the limits of the car and drive it carefully!

Building instructions can be purchased here:

Building instructions for the 42077 Rally Car remote control upgrade with 2 RC buggy motors, Servo motor & 2 BuWizz units – $5.99

Inventory can be found at the end of the instructions and also available on Rebrickable.

Upgrade packs are available for purchase at Mochub:

42077 Rally Car buggy motor RC mod – check description for the parts included – $139.95

42077 Rally Car buggy motor RC mod without Power Functions – $49.95


  1. Ciao, great job…i already got the car, the amount for the building on the video is 139 $?

    • You need 2 BuWizz units, that’s around $200, 2 buggy motors are around $120 and the rest of the parts can be bought for ~$80

  2. You can get the buggy motors now from AliExpress. I just ordered two for about AUD$15 each. From what I have read (on a EuroBricks forum) they work well with the BuWizz though I’ll believe it when I see it.

    My problem is that the BuWizz is so damned expensive for us down here at the bottom of the world (with the exchange from AUD to Euro) so I only have one of them and it really annoys that nearly every fast build needs two of them. I have the 42077 but I’m not splashing another $130 for a second BuWizz so can I still build this or is one BuWizz not enough to power 2 x Buwizz?.

    • Sorry I meant 2 x Buggy motor in my last sentence

      • I am not familiar with the Chinese buggy motor clones, but with the original ones you need 1 BuWizz per buggy motor to run them under load in high/ludicrous mode. You might be able to run 2 in normal mode but then your setup looses the point of using a BuWizz unit.

        • Ok, I see now what you mean. Guess I’ll have to budget in another BuWizz or just use the buggy motors with normal mode or regular battery box/IR controllers for now.

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