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Thanks again folks! @Davidz90 - If it was unloaded the wheel was spinning well over 4000 RPM, the Lego speed meter could not measure the exact value. @mocbuild101 - I'm sure I won't make something this fast in the near future, I spent way too much time with this project :) I'm sticking to the "small & relatively fast" formula, although I could not resist to start to build @agrof's amazing class 1 buggy and try to implement some of my ideas :)

Massive model with cool functions, congrats! And the renders are also fantastic :)

@zux I see your point, but please give me the freedom of naming my videos and deciding on the sequence of words :) As I did not do the run in the opposite direction within 60 minutes I know I don't qualify to claim a Guiness World record (wouldn't be the "fastest Lego Technic car" anyway), but I can live with that... Joking aside, I had multiple runs with a speed between 39-40 km/h but this was the quickest as the car was running dead straight when it went out of remote range so it managed to go far enough to reach this speed. @Marxpek - That's a good strategy for the RC unit, unfortunately if I go out of range with the bluetooth control it is not that simple to re-establish the connection. I'm following your attempts and hope you'll make it with a 100% pure Lego creation for everyone's satisfaction ;)

Thanks guys! I was so close so many times to 40 km/h but finally made it :) I think it was more about the road quality sometimes then the car itself. @Marxpek I tried it on a bike, but I could not accelerate quickly enough before the end of the road, and the touch controls were still hard to handle :) Maybe if BuWizz adds gamepad support someday.. @zux I choose the title "Fastest Lego Technic car powered by BuWizz" for a reason, as far as I know there was no faster BuWizz-powered Lego car yet. I did not say it's 100% Lego, otherwise I'd call itt "OMG THIS IS THE SUPERFASTEST LEGO CAR EVER !!4!!4!!!" or something like that :) Using a 3rd party battery desinged and built especially for Lego is not really the same as throwing out the MOC of the plane and calling it a success.

First of all please watch the teaser video from last week :) A couple of months ago everyone and their grandma tried to build an RC car going faster than 40 km/h. Although I don't have a properly working old Technic RC unit with the remote (somehow I have only faulty ones), I have the necessary amount of buggy motors and 2 BuWizz units, so I had to give this a try :) The build is not 100% pure Lego (although BuWizz is built to be used with Lego), but it still has the fun factor and of course the challenge :) The whole process turned out to be much-much longer than I expected, but at the end it was a success! I spent several weeks creating, improving and testing the car. The basic idea was to use 2 BuWizz units, 4 buggy motors and 4 Technic motorcycle wheels and to add only the minimal amount of components to remain light and fast. It had to be solid enough to survive all the crashes during the tests and record breaking attempts. I had dozens of tests at various locations until I found a proper track and the final configuration of the car was created. During this time a lot of parts had to be replaced as the axles were bent after a couple of runs, you can see the examples in the video. The car does not have a conventional steering to reduce weight. For the speed runs only small adjustments are needed, so the direction of the car is controlled by the speed difference of the wheels - there are two control sliders on the phone for each side of the vehicle. The faster output of the buggy motors is used, the gear ratio is 3:1. I tested several combinations to drive the wheels, the most successful one turned out to be the usage of 36t and 12t beveled gears. The speed was measured with the on-board GPS unit. The car was controlled mostly with my phone, but for the fastest run I was using an iPad (longer range). Even like this at full power the car ran out of range very quickly. I think it would be possible to go even faster with this car, but that would require a completely flat surface and a chase vehicle to ensure the controller stays in range. Maybe another time ;)

And I thought I already have too many engine parts... can't wait to see more photos!

If anyone wants to use BuWizz with a constant output level (e.g. trains) then this is your lucky day - app is updated with trains control. Unfortunately not much else is new... and my dual unit issue is still there as well :/

A little help if someone wants to build the wheeled version with the buggy motors - I created video instructions for the 2 axles:

@tamahandy The buggy motors are driving the wheels directly from the outer (slower) output. Tested with the faster output as well but that was too much stress for the BuWizz units. I can help you with the construction of the axles, I created some photos while I was disassembling them, I can put together a small video similar to this one if it helps. It won't be a complete instruction set but might be enough to give you the idea. @Joey73 That M motor is mounted to an "L" shaped DBG liftarm with a single black pin, and also the axle is supporting it. Regarding the gears I cannot really tell you more than what you see on the image. As this model is disassembled I cannot give you more pictures. I suggest to try to fit the motor yourself in your build and see how these gears can fit and where/how you have to transfer the drive with them. @JTCN The buggy motors did not overheat, in some scenarions the protection of the BuWizz units kicked in when there was a sudden load increase (like hitting an obstacle or accelerating with full power from zero using the high output). To be honest I did not run these cars for too long in a single take, 2-3 mins maximum.

Edited the first post to have all 3 versions in one place.

That's a very nice Trabant, congrats! The shape is very well done, instantly recognizable :)

@msk6003 That's a nice one as well, it would be a fun race :) I like these small & fast creations.

I uploaded a video with the building instructions: Part inventory can be found on Rebrickable

Interesting question, it's all about the reason why you buy a Technic set. If it is for investment, then simply forget about the content of the box, shouldn't be opened ever (but I don't think we have many people here being able to resist :) ). If you'd like to build it once and have it on display, then you shouldn't care about the used price as you won't sell it anyway. The car analogy is a bit tricky, as you won't stop at 1-2 Technic sets and sell it after a couple of years to get a new one. You don't use it, it's more like a vase or a painting. You don't really care about the aftermarket price of a vase when you buy it.. The third option is like myself - if you like to build once, then use the parts for something else, then sell the less used sets to get something new - in this case the best is to buy in bulk, or wait patiently on Ebay for a good used bargain. If you want to get specific parts, buy a relatively cheap set with those parts included, then sell the rest.

I really like the overall design, congrats! Supercharger looks really badass :)

Looks really promising, can't wait to see the rest :) Maybe it's just the perspective but the hood seems to be a bit short for a Charger, isn't it?

Very clean design, congrats! I really like how the non-technic elements are used for the details. Bonus point for the video editing, nicely setting the mood at the beginning :)

I’d like to share a small but agile creation – the remote control mod of the 42033 + 42034 Extreme Off-Roader combined set. Additional parts (mostly for steering) were used only from the set 42035 Mining truck. Servo motor used for steering, L motor for the drive. PF lights were also installed. There are multiple options for the remote control, like: – PF Rechargeable Battery box (8878) or AAA Battery box (88000) – PF IR reciever (8884) or SBrick – BuWizz For the video I used the 8878+SBrick combination as the control was easier with an USB gamepad through the SBrickcontroller app. It turned out to be a very fun little car, pretty quick considering the size.

Here are some pictures of the changes and the inner structure: And some examples of the damage you can see after some moderate offroading - Lego is clearly not made for this: More images in my blogpost: http://racingbrick.com/2017/09/lego-technic-42037-formula-off-roader-rc-mod-detailed-images/

I think you're on a good track, a couple of suggestions: - Avoid overusing effects and different transitions. If you check some professional videos, they very rarely use fancy transitions or coloring effects. If you'd like to use a transition then use a simple one and stick to it. - You have too much shakycam footage in this video, sometimes it is difficult to see what you'd like to show. Try to do more steady shots, hold the camera (or phone, I'm not sure) with both hands, use a tripod, or if you would like to have stabilized shots while you move the camera then there're some simple diy stabilizers you can find online. - Try to keep the exposure on the same level in different shots. Some shots are too dark, others are bright. I assume you use some kind of editing software, you can correct these in post. Just my 2 cents :)

@tamahandy - It runs ok indoors with a single BuWizz if you don't try to start from 0 with 100% acceleration in high mode. I added the second one to be able to run in fast mode on rough terrain and to perform these fast accelerations and stops. There's no gearing, direct drive from the outer (slower) output. I'll post some pictures soon with closer details.

I like the colour scheme of your mod, looks cool! Did you manage to take a video of it? It'd be interesting to see the speed difference.

Thank you everyone for the kind words :) @mocbuild101 I really like the Technic guys as well, try to involve them in all of my videos :) About the next set to "BuWizz-a-fy" (will put this in my signature probably, love it), there'll be more than one - small scale + big power - pure fun ;) @technic_addict as it was mentioned I added the second unit because the single BuWizz + 2 buggy motors combination did work only indoors, not on gravel or dirt. When the motors were stressed the protection of the BuWizz unit kicked in. @Leonardo da Bricki if you have a second buggy motor you can try with 2 AAA battery boxes. Will be somewhat heavier and you won't get the maximum performace of the motors but worth a try. The IR receivers will probably take the place of the seat though..

@Kryne thank you! I made a second much lighter version with buggy motors: Originally I didn't want to remove the tracks but I was asked to test it, so a version with wheels is in the works, too :)

This set was sitting on my shelf for a while, but the time has come for some RC upgrades :) First of all I had to swap the original engine with a V8, it was a perfect fit. Installing the 2 buggy motors was not that difficult either. I tried to get the drive from the buggy motors to the fake engine but that didn't work due to some space constraints, so another M motor was added to power the V8. Tested first with one BuWizz unit, but the stress was too high on rough terrain so I added another unit to independently power the 2 buggy motors. This caused some issues with the weight distribution - the car is not easy to navigate as the back is much heavier - but it can start with a moderate wheelie now :) List of modifications: - Engine swap - Body panels adjusted, frame modified to fit the M motor and the Servo, added roll cage to support & protect the BuWizz units - added front grille - Added 2 buggy motors, M motor, Servo, PF lights, 2 BuWizz units