Originally Posted by
CraigMBA
Be aware that the angle changes things and how it does, but remember on an RC car with significant amount of wheel travel the angle between the spring and the arm doesn't remain constant throughout the travel, so the rate changes.
That's where things really start to get complex since one spring/shock mounting location and another spring rate/shock mounting location that arrive at the same wheel rate in the bounce test may result in slightly different handling characteristics since the leverage of the shock is a bit different through suspension travel. That's where real fine tuning is done and it's the part that is hardest to put into words.
My general guideline for what I'm personally looking for is for my shocks to be at exactly 90 degrees to the arm when the suspension is fully compressed. I try to shoot for the same angle front and rear. That's my goal. I get as closed to it as possible. I prefer not to have a situation where the front shocks are vertical but the rears are laid over or vice versa. If you guys haven't figure it out yet, I like things pretty well balanced.