Recently I have been taking off in Innsbruck (LOWI) with my A320 (in Microsoft Flight Simulator, because I cannot afford the real one) and quickly found myself greeted by a GPWS Warning: "Terrain ahead!". I have been flying the MOGTI 3H SID from Runway 26. The charts state a required minimum climb gradient of 11.0% (that is 2233 ft/min at 200 kts). I probably should have calculated the climb performance before taking off, but I don't know how to do that.
Are there any tables on the climb performance of an A320 with a given weight, flaps and slats config, engines etc.? I didn't find anything specific on the internet. Or is there a way to make the MCDU show me that?