usually when the injector pulse widths hit about 21.xx or higher when WOT then they are static, which means you need to look into an upgrade. on my 3.4 setup in the dead of winter i was seeing 22.xx and 23.xx IPWs and about 15 pounds of boost. in the summer i was only hitting 18.xx and 11 pounds of boost. this goes to show you that weather has a lot to do with how your car runs.
either way, knock is what youre looking for specifically. dont take the IPWs as the bible. also, if your IPWs arent static up top and youre still knocking and dont know why check your fuel pressure. if it drops off up top then you need to look into a higher flow rate fuel pump.
hope that helps you out.
