Bugatti Chiron 1:8

[Leviathan]

Hi everyone !

Fasten your seat belts, because today I’m reaching the top speed of 420 km/h with this replica of the Bugatti Chiron 1:8 scale !
Around 4,000 parts, a weight of 3,7 Kg it takes me 2 years of study and design to achieved it.

First of all, the pictures renders are slightly different than the video content. I made some modifications (for the roof...)

The french manufacturer mixed-up performances and sophisticated design for an unique masterpiece with only few units sold for. The real challenge grabbed my attention so I decided to design it. 
For more informations about the car, please visit :

 

The road map includes parameters following :

• 1:8 scale (using of 42056 tires)
• PFS features (powered by one Buwizz ®)
• 7 speeds Dual-Clutch Gearbox (DSG)
• Full 4WD transmission 
• A good approximation of the bodywork
• Active spoiler feature
• A high rigid chassis
• Modular assembly

This MOC includes a lot of characteristics as well basics manual ones that more complex ones. But first, here are some pictures below :

Main features :

• Dimensions : 56 x 24 x 16 cm
• Weight : 3,7 Kg
• Power supply : 1 Buwizz with easy access
• Motorisation : 5 mottons
• Independent suspensions 

Manual ones : 

• Openable doors with locking system, and openable hood by friction
• Steering HOG
• Unplugable motorisation (RC motors and steering ) for playability because the car is very heavy !
• Openable trunk providing self-invented W16 engine details and Buwizz access
• Openable gloves box…
• …hidding a secret key witch unlock nice PFS features ! (insipired by the real top speed key)

After a long build process, I’m very proud of the result. During development, I decided to put an additional feature to improve playability : a small lever to unplug motorisation. Indeed, the car is very heavy so you can’t move it easily. From wheels to the drive train and the 2 RC motors, the high gear reduction lock any movement.
The secret key system create some kind of manual interaction allowing selection between 2 motorised features powered by one M motor :

• Spoiler extension (3 handling modes reachable) 
• Adjustable suspension in height

I’ve made a small video to illustrate spoiler mechanism :

I found inspiration on Pipasseyoyo Bugatti Veyron system for height setting https://www.youtube.com/watch?v=eaX5JLdBcyg. Irreversibility is performed by 4 worms screw, one for each axle. http://www.techlug.fr/Forum/topic10504.html

I assume all similarity with @Didumos69 anti-roll bar and torsion bars system on the front axle. His advanced setup is very strong and reliable. https://www.eurobricks.com/forum/index.php?/forums/topic/143038-moc-rugged-supercar-hammerhead-19-scale/

Remote ones :

• 5 motors : 2x RC motors / 2x M motors / 1x XL motor
• 7 speeds Dual-Clutch Gearbox (DSG) driven by XL motor
• Spoiler animate by 1 M motor and its own gearbox
• Suspension height controlled by the same M motor
• Steering by 1 motor or the HOG
• Full 4WD transmission driven by 2 RC motors

Gearbox ratios :

1st : 1:9
2nd : 1:6
3rd : 1:5,4
4th : 1:4,5
5th : 1:3
6th : 1:2
7th : 1:1,8
R : 1:9

Gearbox inspiration : 

@Sheepo Rubicon Jeep shifting system :http://www.sheepo.es/2016/06/jeep-wrangler-rubicon-instructions.html

@ibessonov gearbox : https://rebrickable.com/mocs/MOC-5565/ibessonov/sequential-rc-4-speed-dual-clutch-gearbox-with-pf-servo-motor/#comments

Other pictures :

Hell yeah 

Enjoy pictures in HQ :

https://flic.kr/s/aHsm9s9M7C

And here is the video :

I hope you'll like it !

I'm making instruction video for the DSG gearbox, see you soon !

 

Edited April 24, 2018 by Leviathan

[TechnicRCRacer]

Wahoo, you posted it! Super amazing model and a 10 out of 10 on the bodywork! And with buggy motors This rocks!

[LvdH]

Superb model, I am very curious how well LEGO's version will compare. To be honest you've raised the bars for a LEGO supercar. I was especially surprised by the modularity and it has to be my favourite function of all. I do like that it appears to drive smoothly in all gears as well.

Too bad you won't be doing instructions for the full car. I love blue, I've got a lot of it myself, so I really hoped to be able to build it. Though maybe it's possible to reverse engineer it? Maybe very hard, considering how dense it is, but it's something I would be happy to take a shot at. 

Edited April 22, 2018 by LvdH

[Leonardo da Bricki]

Oh yes! I saw the video a while back, was wondering when this would be posted! Finally done, and man! This build is just mind-blowing! Lego's will most likely be rather disappointing in comparison with this beautiful masterpiece...

I am amazed by the gearbox and it's ability to drive this massive model, I cannot wait for the instructions!

[Shiva]

Nice Bugatti :)

[Jeroen Ottens]

Amazing model Definitely worth the wait!

Very interesting gearbox, adjustable suspension, sleek bodywork without looking too cluttered. The roofline is still looking a little off, but that is really details in an otherwise brilliant car.

It will be interesting to see how this compares to the LEGO version. Are you planning on getting that one to see them side by side?

[Lox Lego]

Beautiful update! You've capture so many functions its unreal. Love the secret key and that wild gearbox. Your photos are top notch as well - congrats on a pro hypercar 

[Pvdb]

It looks so much better now that you have fixed the roof and brought it a bit lower.  It was definitely worth doing that.  Great functions as well.  Now it will be really interesting to compare your bodywork with the Lego version that is coming out soon/maybe/one day.

[Meatman]

Looks better with the changes.  Something is just a tad off compared to the actual car though. It's going to be interesting to see how Lego approaches the shape in their set.

Also, doesn't having the steering links in front of the wheels give a reverse ackermann effect?

 

 

[MattL600]

Amazing work there!

You've set an incredibly high standard for the lego group to beat :)

[KD123]

I've been following your build for some time now, what an amazing journey you have been on putting this masterpiece together.  Congratulations.  

Regarding the silver "C" accent on your moc, did you consider extending a silver flex axle down the A pillar or continue using silver flex axles at the bottom in place of the silver tiles that is right below the bottom of the doors?

I see the silver 1x2 thin liftarrm at the front of the car (nice touch to tie into the accent on the side of the car.  In the real car this silver accent continues from the front of the wheel well and extend below the entire length of the #2 blue panel that you have at the front of the car.  As such the 1x2 thin silver lit arm that you current have at the sides of the front of the car appears to be a half a stud too high in relation to where the accent is on the side of the car.  Not sure if I'm making any sense here but at any rate, minor details.   

I do think the car is too long in front of the front wheels vs. the real car but that said I actually like the front end of your moc vs. the real Bugatti which I think is way too bulbous looking imo. :)  Also the rear diffusers seems to extend well beyond the  black curved panel 3x6x3 which you've used ingeniously to define the back of the car's bumper.  

What a great build!  well done!

[Aventador2004]

Just absolutely magnificent, lego better make theirs really good!

[mocbuild101]

4 hours ago, MattL600 said:

Amazing work there!

You've set an incredibly high standard for the lego group to beat :)

+1 There's not really mush else to say...

[LM71Blackbird]

Really cool model! I'm a McLaren fan myself, but it is hard to not appreciate other beautiful supercars! Great work on all the styling and details!

[jwarner]

Absolutely stunning! If I'm disappointed with TLG's version I'll blame this 

[Lipko]

It's actually prettier than the original car 

[Meatman]

5 hours ago, MattL600 said:

Amazing work there!

You've set an incredibly high standard for the lego group to beat :)

This is in no way a disrespect to Leviathan as I think that as an AFOL, he did a great job with a very difficult automobile, but a fair amount of this build would not meet The LEGO Group's standards.

 

[letsbuild]

Absolutely stunning! 

I don't remember how I first found you, but I've been following your Flickr since the first WIP pictures. Your progress was fun to follow. Great final product.

[Carsten Svendsen]

Normally I don't care about car MOC's but in this case, I am willing to do an exception.

I love the fact that you can take it apart in modules so easily, it makes troubleshooting so much easier. 

I also like the idea of solving difficult angles with a steering wheel link, that never occured to me. Maybe because I don't own a 1L steering bar but still

I don't care much for gearboxes in general. The really cool thing about this model is one switch for putting it in manual/motorised mode, and I cannot comprehend how that is possible with just one transmission ring. Please explain?

I don't need to mention the Aesthetics as that is clearly what kept me reading through the post in the first place.

4000 parts, not bad, I'd buy that if it was a set.

[Jurss]

Amazing 

(especially with improved roofline)

[1gor]

Somehow it looks to me that cab area is to high and body is to low from side view, other things are really well done 

[Ox1337]

You are maniac!

[Didumos69]

Excellent work! Lifting the rear side of the hood by one stud really improved the overall resemblance. One question: Does it have opposite Ackermann geometry?

Edited April 23, 2018 by Didumos69

[LvdH]

9 hours ago, Meatman said:

Looks better with the changes.  Something is just a tad off compared to the actual car though. It's going to be interesting to see how Lego approaches the shape in their set.

The rear fenders are too high, and the windshield doesn't have the curves because it doesn't have a windshield. Both the front and the rear look too long as well. It appears to still look too high as well, but it's already miles better than before.

3 hours ago, Carsten Svendsen said:

 

 

I don't care much for gearboxes in general. The really cool thing about this model is one switch for putting it in manual/motorised mode, and I cannot comprehend how that is possible with just one transmission ring. Please explain?

 

There is a driving ring which is engaged when it's in RC mode. When shifting to manual mode, those driving rings disengage and you can steer and drive freely. Also there have to be at least 2; one for steering and one for driving.  

[MattL600]

3 hours ago, Meatman said:

This is in no way a disrespect to Leviathan as I think that as an AFOL, he did a great job with a very difficult automobile, but a fair amount of this build would not meet The LEGO Group's standards.

 

Why is that :o