Tup4n

@Krzychups here is photo. As you can see, it uses standard hole for Lego axels.

For my next project I decided to use smth new instead of ZENE Bricks motor. Their 500w brushless motor was proved to be reliable and powerfull (I managed to reach 53 km/h on the 1:8 scale car ) but you now this feeling, when you want more and more power and speed. That’s why I picked this one. 800w (60% more powerfull then Zene’s) 2847 3200 KV Ysido with steel 46 tooth spur gear and aluminium axle. This thing is really strong

@T Lego Hey! The project is finished line, so maybe you will be interested in what challenges I faced during the building process. To be honest, the whole front axle gave me some problems, since I wanted to keep all the original features of the suspension and make them remote controllable. 1.I decided to use two separate servos for the steering and dynamic suspension, and an additional servo for the ground clearance feature, which I like the most and find very useful when driving the car outdoors. The problem was synchronising the steering and suspension motors while retaining the ability to completely turn off the dynamic suspension when it is not needed. The solution came from the Flysky GT5 receiver, which has settings for a so-called crawler mode. This lets you set how you want to operate the front and rear axle servos (in our case, the steering and rolling rack servos). You can also switch it off at any time to completely turn off the dynamic suspension. Done! Unfortunately, I have to disengage the rear axle since the back of the car is now too heavy and I am experiencing gear skipping. 2. Ground clearance is controlled by a separate servo and is simply an up/down button on the receiver. However, worm gears have an insane amount of torque, so pushing the trigger too far from the limits can break the connectors between the 24th gears and the suspension arms. As I cannot set the turning limits for the 360° servo, I must be very careful. 3. Sadly, I have to rebuild the steering column to connect it to the steering rack. Currently, it uses a simple universal joint, meaning the paddle shifters do not turn with the steering wheel. 4. Another issue was the rear shock absorbers. They could no longer support the weight of the car at the back, so I replaced the original springs with new custom ones. It works perfectly now. 5. The front axle now has positive caster( it is simply impossible to drive rc cars with out it). 6. The receiver has built in gyro to stabilise the car on high speed and assist in steering. Cool feature, which together with the positive caster helped me to catch up the speed record. 7. The most unpleasant thing for me was the size of the front mud guard. I dont know, how it works on the origial model, but with half stud ofset for caster angle wheels constantly tough the front fenders, so i have to move the whole car's front by one stud! In this case, i should fill the huge gap between the front section and the axle. I altered the length of the hood and front fenders. I hope i wont affect the original design too much. 8. Yesterday, I reached 53 km/h using an 11.1 Lipo battery. As far as I know, this is the fastest 1:8 scale Technic supercar made from plastic bricks to date. I am very happy with the result. The drivetrain is built with aluminium/ steel axles, universal joints, ball bearings, RC differential and custom wheel hubs. I think that using around 20 custom parts out of 4,200 is still legitimate for calling this car 'made of Lego bricks'. Overall, I was really impressed by the car's bodywork. I have built quite a few 1:8 scale models, and this is the best-looking one in my opinion. I reinforced some fragile areas so that I don't lose any parts while driving. I can safely say that I have never lost a single piece as long as I avoid large bumps and obstacles. I have attached a video of the test drive. I hope you like it, and thank you all for your interest!

I used most of the parts from Zene bricks. You can check it out! @T Lego Today the car reached almost 50 km/h in not perfect conditions. That makes it one of the fastest lego car in the world, especially in this scale. I think it is possible to reach 50+

Thanks! I keep the dynamic suspension (and ground clearance adjustment) on the front axle, but have to disengage the rear because the back of the car is too heavy now and I faced with the gear skipping. I will post more detail review in the future!

@T Lego Well, this project gave me so challenge for sure, but I am at the finish line. I am still fixing some bugs/making adjustments, but you can watch some raw footage until I prepare full video and record the car’s top speed. This car has a really good speed. Just look at it’s acceleration! Here are some shorts video how it performs. I think you will be interested to see how your car looks in action.

With the summer is comming my brushless RC McLaren P1 is ready to get back on the road!

I finally got all the parts I needed and started this project. I finished the rear axle + engine bay and quite happy with the result. I managed to fit all electronics (2200 mah battery, the brushless motor, ESC, reciever, 3 cooling fans) in this compact build and keep the original feature of the dynamic suspension. I have to modify the rear axle for new wheel hubs tho. The entire transmission is built using aluminium axles, aluminium universal joints, RC differential and lift arms with ball bearings.

I agree with your points. However, as far as I concerned, 42172 was not originally designed for high speed also)) However it turns to be very robust and managed to deal with all challenges. Sure every Lego super car 1:8 will be heavily damaged if you crash it the wall or etc… Regarding this car, small system bricks can be a problem, but I believe I can modify the body/chassis to be more robust. I mean, I have to change the half of the chassis anyway to put all electronic components and the large battery

They will not fall of, because I am using custom 3D printed wheel hubs with bolts. I have already motorised McLaren 42172 and Cada AMG ONE and reached 40 km/h. Faster, then the BuWizz

@T Lego sorry to bother you, dude, but I have some plans to motorise this set with the brushless RC set up and to achieve some decent speed. In this regard, before I buy the set from the Cada, I have some technical questions. 1) do you know exact weight of the car? I saw you wrote it is around 3 kg. The car has 1000+ more parts than a Lego Daytona and Sian. So, can you confirm that it has the weight similar to these cars, or it is heavier? 2) can I use the rims from the Bugatti/Sian, or they will not work? I saw, that in your early prototypes you used rims from the Sian to build the chassis. thanks in advance!

Thank you! I have some plans on motorization of 42115 in the future. Since it is all-wheel drive car, it sounds like a new challenge! Sadly, I dont have a lot of photos of the motorization, since i completed the build quite fast. But i can share all that i have. This is how the motor is attached to the chasis. Rear axle with 1) RC differentinal, 2) 2 geek servos for spoiler and fake engine, 3) main pair of 12:20 gears Custom wheel hubs and positive caster angle (must have! It is impossible to drive the car with out these options) I have to reinforce the rear suspension, as the weight of the car's back increased sugnificantly due to the battery and the motor. With the single spring on each side, it just stopped working. Overall look of the engine bay

Hey! Yes, the motor tends to overheat extremely fast. You should use the cooler fan in order to keep the motor safe. In the beginning I have experienced the overheating just after 5 minutes of driving. Now I can play with the car around 20-30 minutes (until the low battery) with out any problems and the motor stays cold. I will recommend Surpass Hobby Rocket RC cooler fun - it’s cheap, has high rpm and does the job. I can definitely say that you just can’t use the motor on such a heavy Lego cars (3kg) with out cooling system. About reduction gears. The motor from the Zene has a build-in 4x planetary reduction. I am using additional 12:20 reduction gear ratio just for more torque and to reduce additional stress for the motor. I have tested my Cada Mercedes AMG ONE with gear ratio of 16:16 for more speed, but in this case at 30+ C outdoors the motor temperature was too close to the limits. That’s why I ended up with this setup - strong cooler fun and 12:20 gear ratio. It’s reliable and fast enough.

Agree! They look realistic and stunning, and in the same time, provide a challenge for the builders to make them fast. I spent 4 mounts on my previous project with motorization 1:8 super car with the brushless system, and there were so much issues/problems and bug fixings, until I managed to find a working solution for the drivetrain/motor cooling and the suspension. After that, motorizing this McLaren was as easy task.

Hello! I have motorized the original Lego set 42172 with the brushless system using mostly custom parts from Zene bricks. It took me 2-3 weeks to finish this project, since all technical solutions and parts have been tested on my previos 1:8 supercar - CADA AMG ONE. I managed to reach the top speed of 40.8 km/h on this set up using 12:20 gear ratio in the drive train. Since Mclaren P1 a little bit heavier then CADA AMG ONE (+400 g.) i expect only around 32-35 km/h. Here is the specs: 1) The motor - Surpass Hobby 2445 50000 rpm (3600 kV) 2) Cooling system - Surpass Hobby Rocket RC 20000 rpm 3) 3 geek servo motors for steering, fake engine and spoiler mechanism 4) The batttery - 11.1V 1800mah 5) RC differentinal, metal universal joints, metal shafts, ball bearings and etc. 6) Gear ratio from the motor - 12:20 6) Custom wheel hubs 7) Car weight - 3,7 kg (with the battery on board) 8) Expectation top speed - around 32-35 km/h I have attached some video footage. All in all, i have so much fun driving this car. Hope you like it!