3D Suspension Design

I originally planned on using the upper balljoint to adjust camber and the lower to adjust caster. This will allow perfect adjustment in the correct 3 dimensional plane. Toe-in will be adjusted using adjustable tie-rods. In order to see how this goes together, I've drawn the driver's side front suspension in 3 dimensions in Autocad. I found out that this was just too hard to do and talking to a frontend mechanic, it would be almost impossible to align. Wouldn't be able to get the tools in to adjust it.

Here's early 3d drawings of the control arms, spindle and disk brake caliber, shown from the frame rail looking out (front of car to the right): leftside. This image is a top view showing the upper control arm. The wheel rim is shown and is pointing directly forward, the front of the car is to the left. The 63 degree angle of the control arm to the frame is quite evident. The lower control arm uses the original spring mount basket and bumper mount plate, the location of the upper arm crossmember mounts is shown just above the spring basket. The relationship between the unequal length control arm length is quite clear from this view.

This image shows both the upper and lower control arms, spindle and rim. I'm still playing around with the scrub distance, which is the lowest part of the rim. Basic design theory says that no suspension part should be lower than the rim in case your tire goes flat. You don't want to have suspension parts rubbing on the ground. This is currently set up for a 2" drop but I probably will go to 1 1/2".

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Copyright March 2011 Eugene Blanchard