Mini 42109 TG Rally Car - AWD

[N1K0L4]

Hello, 
so before I made the RWD version I had made a AWD version similar to this one. It had one major drawback, a poor steering angle. I did take it to the BuWizz Gathering and had fun with it there,

but at the same time it was kinda frustrating not being able to turn properly. After that I built the RWD version which handled much better.

One day @Alex Ilea shared a idea with me for getting rid of CV joints which he's using in one of his models. When I saw that I immediately got to designing the new chassis.

Because of a different front axle, the wheels would be quite far from the steering pivot point which would take valuable space. Because of that I had to make my own rims which could support the tire over the gears. I ended up with this setup. 

 

This wheel ended up not being used so often as I replaced it with the 86652 rim when drifting.

And this is the finished model. It retained most of the body from the RWD version but lost the interior. It also still has the opening rear hatch which is quite useful here for charging the battery.

The main idea behind this model was to make a small AWD drift car for small indoor places. I consider this model a success in that regard.

Specifications:

• 27 x 13 x 11 studs (21.6 x 10.4 x 8.9 cm)
• 2 PF L motors for drive
• 1 PU L motor for steering
• powered by BuWizz 3.0 Pro
• 1:2.77 gear ratio
• AWD without differentials

 

Stud.io file: https://rebrickable.com/mocs/MOC-201401/N1K0L4/mini-42109-tg-rally-car-awd/

You can see more close ups and some drifting footage in the YT video:

 

I hope you like it!

Nikola

[Another Brick in the World]

Nice one! one of my favourite mini racers just got even better :) It was cool to drift with you and the others at the BuWizz Camp, even if the V1 had a slight understeer. That gear solution for the front axle together with the custom rims was pretty interesting, it now begs for it to be put to use in a FWD moc ;)

[N1K0L4]

7 minutes ago, Another Brick in the World said:

Nice one! one of my favourite mini racers just got even better :) It was cool to drift with you and the others at the BuWizz Camp, even if the V1 had a slight understeer. That gear solution for the front axle together with the custom rims was pretty interesting, it now begs for it to be put to use in a FWD moc ;)

Thank you! Yeah, the drifting was very fun, looking forward to doing it next year too :)

[gyenesvi]

Nice compact model, and that front drivetrain is interesting too, I did not think it could work.. Does it fit with regular rims as well?

[N1K0L4]

2 hours ago, gyenesvi said:

Nice compact model, and that front drivetrain is interesting too, I did not think it could work.. Does it fit with regular rims as well?

Thanks!  It doesn't fit like this, you would have to space out the wheels 1/2 a stud on each side because of the shape of the rims.

[LegoTT]

Your design for this front drived axle sound sturdy !

And you deal with high electric power for Lego there, so if the front gears happen to click under full power, you can use this trick that can deal a beating :

 

 

[N1K0L4]

3 minutes ago, LegoTT said:

Your design for this front drived axle sound sturdy !

And you deal with high electric power for Lego there, so if the front gears happen to click under full power, you can use this trick that can deal a beating :

 

 

In my case the gears never clicked as the weight of the model is basically pushing the gears together, but I'll consider your design if I'll be dealing with higher power.