have your rear tires at 35 psi (or higher if they can go higher), fronts at about 23 or so. See what pressure works best for your tires when launching (it would be different for different tires, you could go from 18 psi to 28 psi, or who knows what, but 23 should be low enough to get some more traction on pretty much any tire)
set your rear shocks as stiff as possible, your front shocks as soft as possible