After watching all the videos and working with the software I wanted to thank you for the graph of the F1 tire showing grip and loading. Everyone needs to understand that example to see why the firmer end of the car has less grip. So much of the balance is based on those principles, and the concept is not intuitive.

TT02 S-spec project. This Tamyia car is based on their lowest level tub touring car. What they did for the "S-Spec" was to tack-on the suspension arms from the TRF racing machines (419 etc). I thought this would be an interesting car to learn with.

First I created the model. I re-did the lower suspension point measurements a few times because it seemed as if even very small changes there made big changes in the roll center. Unlike the other TRF cars, this one does not have the adjustable hinge pin mounts. The hinge pins go right into holes in the tub chassis; only one location vertical or horizontal.

What I wanted to do, as an exercise, was to optimize the model with the software, using the parts that came with the kit.

First thing I noticed was that the roll centers are low and the camber gain is almost non-existent. Indeed eyeballing the car's front demonstrates an almost parallelogram front suspension and pressing 3mm keeps the camber meter the same.

There are very few adjustment points. Rather than drilling holes, buying hop-ups, and making stuff, the challenge was to get it the best it can be using the parts in the box and some shims.

I increased the height of the front outer camber arms, only to find the wheels don't fit. I had to compromise on 1.5mm. I did the same on the back, only to find the threads on the end of the ball will only hold about a 2mm shim.

Without changing springs from the kit springs, I used the model to adjust the shock positions to balance the car.

The suspension spring preload is set with those spring shims. With the 4-scales, I was actually able to get good side to side balance and equal cross-sums. Anyone can twist adjustable collars, but I wanted to see how close I could get with the shims. (very close indeed).

Camber gain is still low, so static camber of 2.5 was needed.

All, in all I think I got the numbers looking pretty good and I'm anticipating a easy-to-drive balanced car, realizing it will be a VTA and the chassis is pretty soft and has no roll bars. I may be able to try it out this weekend.