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Posted
On 11/8/2024 at 10:53 AM, Tup4n said:

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 

There are also big problems with the strength of Lego Technic constructions. Until recently, I thought that the 3L bar (87994) inserted into a round pin (61332 or 66906) blocked its exit from the round hole, but in the instructions for the new G500 it turned out that this is not so - see steps 28.6 and 29.6 of the instructions for 42177. To strengthen the structure, you will have to use bolts and nuts, screws or superglue.

  • 2 months later...
Posted

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.

viva 2

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.

viva 1

 

viva 3

 

  • 3 months later...
Posted (edited)

@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.

IMG_0123

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.

 

Edited by Tup4n
Posted

@Tup4n Wow, awesome work man! Keep me posted for the final result. Did you manage to keep the dynamic suspension? Its hard too see on the footage

Posted
17 hours ago, T Lego said:

@Tup4n Wow, awesome work man! Keep me posted for the final result. Did you manage to keep the dynamic suspension? Its hard too see on the footage

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!

Posted (edited)
On 5/10/2025 at 7:44 AM, msiminski said:

*oh2* Could you share a list of all the components you used? Thanks!

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+

IMG_0132

 

Edited by Tup4n
  • 2 weeks later...
Posted

@T Lego Hey! The project is finished line, so maybe you will be interested in what challenges I faced during the building process. 

IMG_5081


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.

IMG_0203


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.

IMG_0201

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'.

IMG_0078

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!

IMG_0168

 

Posted

@Tup4n Thank you for sharing the final work! The result is impressive, to say the least, and I am glad you could keep some of the original features. Not to mention the looks have not been affected much, as well as the interior - bravo! I hope the dynamic suspsension assists in stablizing the car through turns. In fact that was the main idea behind the mechanism, although I never imagined someone driving it around at speeds where it could ever make a difference. :pir-thumb: Cheers!

 

 

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