If you do end up spinning the tires it cuts off fuel and engages the breaks. You definately don't want that. They tell you how it works in the Manual. So just learn how to launch with it off and you'll be set. I know where my tires will spin so i bring it up right before that.
You don't want to stomp it either cause you really stress the engine. I ususally bring up the RPM a little before i launch to minimize the stress on the drive shaft and stuff. Its easier on the whole front end.
'95 Bonneville SSEi - Forest Green Metallic/Dark Tan Leather 136,000 Miles
Mods: Custom Intake w/K&N RX-4750 and custom CAI box, 180 Stat, 24k GVW Tranny Cooler, ZZperformance SC coupler, Sylvania Silverstar (low beams), Michelin Pilot Sport A/* 225/60/16 Tires, RSM Rotors w/Raybestos QuietStop Ceramic Pads, Gold Painted Calipers and Drums, Vented SC cover, Taylor Pro Spark Cables, NGK TR55 Plugs, Red Interior Lights.
Current Projects: 2.5 SC Pulley, Ram Air, Header Wraps, Muffler + Hi-Flow Cat