TT02 Rally/Drift Steering Upgrade Package

This prototype package is designed to create an inverted steering servo mount for the Tamiya TT02 RC car, inspired by Dario’s RC Garage's TT02 Rally build (check out his YouTube video https://youtu.be/vn6-rkGbRhM?si=YZQxRBIs-eroeklb for setup details).

This upgrade is perfect for transforming the TT02 into a true competitor in tight-turn RC rally racing, similar to the European RC Rally circuits where there's tons of hairpins and tight narrow twists through their stages, this would also be a great drift steering mod as it allows for insane rotation of the wheels.

Tested and works well, but needs a few adjustments, tests, and prototypes to get it perfect which I'll be working on this week. :)

Challenges I've faced along the way:

-Had to cut and sand away a bit of the chassis near the tires to prevent rubbing. You will have to do the same, you will see where the tires rub, grab a dremel tool and cut a bit away from the chassis.

-Had to take out the entire suspension system (Top/Bottom arms on front and back, and Steering Axles) and cut away any excess bumps that prevent steering lock-up.

-Built car to high ride height, and added 55mm oil filled shocks with soft springs to get it up to 18mm ride height.

-I used a HDPE Cutting-board material for the top plate in the first prototype and it wasn't stiff enough to resist torsion caused from the steering system.

-Tie rod screws bumping into the driveshaft cover, causing the entire top plate to buckle—hopefully fixed in version 2.0 by moving the servo unit forward/ shortening the T-bone.

-I had to cut a 45 degree angle on the steering links underneath the outer hole where the tie rod connects, if you install it you'll see what I mean, the bottom of it clips the chassis a little bit if the ride height is tall and the suspension is drooping, so don't be afraid to grab a Dremel tool and chop a bit off to see what works.

Version 2.0:
Top plate dimensions refined for better fit.
T-bone servo horn length shortened and optimized compared to v1.0
Steering Links, Print, test, adjust if needed; I had to cut a little bit of the bottom corner off my steering link to allow it to over the chassis. I will be modifying the file to accommodate this modification shortly.
V2.0 seems to cause the screw head from the steering tie rod to clip against the drive shaft as the servo horn is hanging too low. So i've included a 30mm x 50mm riser for the servo, I found 6mm spacing works to life the servo a bit off the mounting pad, or even 6.5mm thickness.

V3.0:
-Changed Dimensions of top servo mounting plate and optimized screw hole position.
-Added Servo Riser Plates to ensure servo horn clearance

Testing in progress—looking forward to seeing how v2.0 performs. is always appreciated, and I’ll update once I’ve installed and tested it more.

Materials & Recommendations:
I'm gonna print mine in PETG 40% infill, and if it breaks at any point in the future I might switch to aluminum. PETG should be stiff enough and last a while.

I reccomend printing the top plate at 5mm thick, and then adding a 5mm Servo riser pad, you can also change this ratio depending on the depth in which your servo mounts, ensuring servo horn clearance from both the top plate and the chassis below it.