Here's a little video I did back in 2011. Toggling the LPG on and off. It's set to activate at 6psi of boost. You can see the difference when it's not on versus on when it hits 6psi. It ramps up way quicker and I get free boost. It kicks in at about 100kph and the van will go up on it's one to 125kph or so if you don't back off the throttle.