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I've been trying to build a 1:10, rear-wheel-drive rally car and am running into a number of problems. Right now the issues are with the front suspension and steering. I had hoped to have 1) short long arms suspension (for progressive camber with suspension travel) 2) some caster angle (to help with bump steer) 3) Ackerman steering (or close to it); here I'm using a three-piece tie rod [EDIT: adding a bit of longitudinal reinforcement fixed a lot of this, but I'd still like to hear what people think of the setup and if they have any suggestions] However, I'm having three two problems: 1) SLA suspension plus caster leads to terrible toe-in and -out with suspension travel 2) The tie rods are behind the wheels, and there is way too much play in the system (and some toe-out when moving forward). Some of this I know is due to my not having fully reinforced the steering rack assembly, but I'm not sure more reinforcement will totally fix it. Basically, the two-stud-wide rack assembly wiggles forward and backward a lot when you push on the wheels. 3) With aligned and equal-length wishbones, I get near-Ackerman performance; with this setup I no longer seem to. The wheelbase is 30 studs, and the current (tentative) design is below. Top (with the motor towards the front of the vehicle) Bottom (note that the 6L arms are offset .5 studs from the top arms): Any advice would be much appreciated. Or if you can think of other people's MOCs I should look at for inspiration, let me know. Thank you!
