ActiveSuspension chassis kit for M class

This kit is a chassis to use the Superscale2020 active suspension unit effectively. It features a compact package that combines torsion bars and active suspension in the size of the Tamiya M chassis (wheelbase 239mm).

This model also uses gripped tires for a more realistic scale appearance. We recommend using a DC motor for the crawler or a multi-pole brushless DC motor to enjoy realistic behavior at very low speeds.


The drivetrain of this kit is designed to maximize the use of Sakura D5 parts available to everyone. As a result, it is possible to use active suspension at a lower cost than collecting the necessary parts individually.

A steering gyro is not necessarily required, as the tires provide some grip.

What’s included in the kit

What you need besides the kit

The list with active links can be downloaded from Google drive.


The Superscale2020 “SS” unit is a key component of this chassis and should be purchased here.

1, Servo and torsion bar box assembly

Front. Install 9*17*5ball bearings and secure servo with M3*10 screws. Do the same for the left side.

Torsion bars are printed with PETG. Please check the print settings.

Insert the torsion bar into the suspension arm. Use a rubber hammer or similar tool to gently drive it in; use a Zig to drive in the appropriate amount. Do not install the servo horn at this point.

Install 5*10*4 bearings on the sus arm. fix the servo with M3*10 screw. Do the same for the left side.

Install 9*17*5 bearings and spring bars as for the front side. The spring lever is different from the front side, so be sure to check that it is springlever_R.stl and that the installation orientation matches the diagram.

2,Superscale2k20 “ss”unit Unit initialization

First, use arduinoIDE on your PC to connect to SS unit. Make sure you have the latest version of the firmware. The latest version is Ver1.22 (13 Sep 2022).
You can check the version on the serial monitor. Then turn the potentiometer to adjust the offset value to 0, and turn off the power once it is done. 

3, Neutral position setting for all servos.

Due to the space limitations of this chassis, it is necessary to connect each servo and SS unit as follows in order to reverse the servo rotation direction.

  • SSunitRL output>FrontRight servo
  • SSunitRR output>FrontLeft servo
  • SSunitFL output >RearRight servo
  • SSunitFR output >RearLeft servo

After connecting all servos, place the SSunit on a flat surface, turn on the power, and in a few seconds, all servos are in a neutral position and stable. Turn down the power.

Adjust the neutral position and the axle position with reference to the figure. The servo horn is tightly engaged with the servo output shaft when the screw is tightened.

Set up the left side in the same way
Note the mounting orientation of the ball end!
Set up the left side in the same way
Note the mounting orientation of the ball end!

4, Frame Assembly

The steering servo is secured with double side tape.

Then connect the front and rear frames.

5, Front axle assembly

Fix the knuckle clamps to the suspension arms using Sakura D5 M3*12 flat screws.
5*10*4Ballbearing. axle bolt.

6, Brace installation

Install the battery holder.
The front and rear braces are attached with double side tapes.

7, Drivetrain

Use standoffs and gearbox braces to ensure frame plate rigidity.

The gearbox brace is also used as an ESC mount.

Fix standoffs from the back of the rear frame as well.

8, Axle with washer

Front axle with 0.5mm washer
Rear axle with 0.5mm washer
wheel back side.

9, SSunit tuning

  • offset 0
  • multi 3
  • Bal 45
  • Range960
  • Speed 2.0
  • Damp1.0


How to get the STL Data

You can Download this model`s Full STL data from

PDF assembly manual


Active Suspension Conversion Kit For Yokomo YD-2 E series /S series

This is a suspension Conversion kit. To use SuperScale2k20 SS Unit, This kit can use the full potential of the SS unit instantly. And you can get the realistic motion for your Yokomo YD-2E/S chassis.

This is an STL Data kit

You have to print out all parts by yourself. The material you should use is ABS or ColorFab HT, etc. otherwise the parts don’t have enough rigidity.PLA is not recommended


  • Design for Yokomo YD-2 E series /S series
  • Active suspension and conventional suspension hybrid.
  • Simple and reliable, easy to swap design.
  • Fully compatible original suspension geometry

What is contained in this kit?

Nozzle Dia. 0.4 infill rate 30% vertical perimeters 3

What you need without this kit

  • SuperScale2k20 SS unit
  • Suitable servo *4
  • 10A UBEC
  • 3M Double Side Tape

Digital servo required

For Drift Car, Don’t need so much torque. 5-10kg may be enough, However, a metal-geared servo is required.

YD2E/YD2S Both types of data are included.


1, Installation

2, High Torque Servo installs

Only for this part, you have to use M3*6 screw, instead ofM3*10 screw to avoid not interfering with fixing the screw.

3, Remove the bumper

The Bumper fix screw is used to fix a servo Bracket

4, Swap the Strut tower bar(Front)

Front Strut (Remove the  original Strut Tower)

Remove the ball end and fix it in the correct position  Use a Tamiya Fluorne coated Stabilizer Ball connector set For the front, use this one.

Assemble the front Strut tower by adding M3*15 screws for the front. Do not over-tighten. Check for minimum play and movement.

 The assembled strut tower needs a little bit of friction. If this part is too loose, the SS’s multiplier value can’t increase, and serious oscillation will occur and won’t stop. However, regular suspension linkage parts have to always be very smooth.

5, Swap the Strut tower bar (Rear)

Assembling the Rear Strut tower: (Assembled)

Use an M3*12 screw for the Rear. (Do not over-tighten)

Check minimum play (The arms should move easily.)

The assembled strut tower needs a little bit of friction. If this part is too loose, the SS’s multiplier value can’t increase, and serious oscillation will occur and won’t stop. However, regular suspension linkage parts have to always be very smooth. Use a Tamiya Fluorine coated Stabilizer Ball connector set For the Rear, use this one.

6, Mounting the servo holder

Front side

Use the screw that Yokomo original Bumperfix used.

The *Front servo holder has 3 screws. The rear servo holder has 2 screws.

Rear Side

Remove the original bumper and replace it with the Servo holder.

About the Rear screw. Use the screw that yokomo originally used.

7, Initial setup of SS unit

Be aware of  the gyro sensor position in SS unit

8, How to setup SS unit

You need to install Arduino configuration software. Please download from the link below.

You may download Arduino IDE  software for your suitable platform. macOS or Win

Firmware needed from SuperScale2k20


*this firmware is  pre-installed 

Steering Gyro mount hole is used for antenna hold.

Step 1

First, connect the SS unit to the PC and set the offset to 0.

Next set BALANCE to 50.

The servo‘s neutral PWM value is  almost 1500

FLpos 1500

RLpos 1500

*you should provide the power for SS Unit cause  USB doesn’t provide enough power to move the servo neutral position.


Check all 4 servos in a neutral position, and then Set the servo horn like this.

Servohorn and endball fix with M3x8 cap screw


Adjust The turnbuckle length, and then connect the servo and Strut arm.

Front and Rear Rod Length

Front Rod length Front=41mm



All about the physical setup is done, please test the sample setting value.

Spring  preload

Rear 1mm

Yokomo YD-2  sample setup value

This is the start value to set up the active suspension

For more detail, please refer to SS unit manual.

Front Suspension Setting

Rear Suspension Setting

It will be better to change more high viscosity dumper oil.

Body mount kit

Body mount post parts have compatibility with Yokomo Genuine Body mount rod. You can use your suitable third-party body mount. Or make a hole in the body and fix the body using a Body pin.

Do not use this file for commercial purposes without any permission.


This model was made with FDM 3Dprinter, the parts have some additive markings, however, no problem with those parts’ functions.


The product can download from