Originally Posted by luspeed
Ed explained that the waste gate plays a big part in controlling boost which explained what was causing the spiking. As part of the retune Ed had to change my waste gate orifice to get the boost under control. If you do switch to a div w/g I would find out what size you may need to change your orifice to in order to compensate for the increased flow of the w/g gasses. Ed's a cool guy and I'm sure he'd be willing point you in the right direction with that.
Did Ed explain to you that the wastegate is the ONLY thing that controls boost, not just a big part of it.
Now I see though. He changed the waste gate spring, and probably upped the boost too