1.8T AJQ a V8 ?

Hello Have the following problem. So my 1.8T AJQ with 180hp series puffed up on over 200hp has said goodbye on the track, is already 3 months ago, but so far no one could help me. He takes no more gas, or let’s say so, as soon as I give gas knocks the engine without ending, if I give very minimal gas, so until briefly I can still drive over stand gas, but as soon as I go over it knocks it like crazy. And in the stand it sounds like a V8, but does not jerk in idle, k This is how it works. Error memory doesn’t show anything broken, except for the knock sensors, which they have reached the limit of the rules, etc. Since no one could help me, I work at VW, Master knew nothing, but didn’t have it checked out because I logged it off, so Meioster doesn’t know the problem. Since no electronic error was really detectable, I thought that probably the timing belt has slipped around a tooth, can that happen? And where does the OT sit? g? When I pull out the plug at the gear bell, I see the flywheel with gear wreath and before that there is also nocjh a hole, on the flywheel is a notch, is that OT? And on the camshaft wheel, is that the dot-like death? and that must then match the notch on the cylinder head cover, right? So how do I now recognize the camshafts, if the ev. are wrong? are there also markings on it, if I take off the ZK cover? I hope someone can help me further.