sanyarcosean wrote:
Its 72 beetle suspension used in a custom tube chassis on a dune buggy. It will be an autocross/trackday car that will see street use.
Following 44dwarfs thinking, would lowering the front pivot below center push the nose down as I accelerate from a corner?
That would be more of a rear suspension anti squat function. On acceleration, the normal reation of the car is for the nose of the car to rise in reaction to the forward rotation of the rear tires, thus transferring weight to the rear. If the rear rises, this counteracts the weight transfer and that's what a lot of anti squat does. You see that in drag race cars, the back of the car will jump straight up when the throttle is opened. Problem is, the geometry that produces a lot of anti squat could interfere with other things that could lead to evil handling of a road race/AX car. I understand what 44's talking about, but I am not sure the effort to raise the torque tube up to achieve the 3 degree up angle would be worthwhile.
To see what I mean, imagine your chassis level at ride height. The trailing arm points forward from the center of the rear wheel. If you angle the rear arm down 3 degrees with its forward mounting still in the same spot, the rear of the car has now risen. The only way to get the ride height level again is either 1) raise the front pivot point which means fabricating mounts to raise the torque tube 2) run shorter rear tires 3) lower the rear arms back where they are (level, generally).
On the front, you can do geometry to add anti dive unless, as in your case, you have trailing arms. Methinks you are stuck unless you want to get into a lot of fabrication; my suggestion is to run all the control arms parallel to the ground at ride height, get adjustable shocks and dial in a lot of rebound on the front to help control the rise.
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