Crazy knock in 3rd, o2 sensor or knock sensor bad?

[nates6969]

Ya see I wondered about the air flow issue. the previous owner of the turbo mas hacked the hell out of it and now at idle it runs very lean, low fuel trims at 139 (maxed), mids at 120, and highs at 100.4 right now but computer was reset a day ago and hasnt had much time to adjust since im not constantly ripping it in the car. Right now I have nothing to tune with! and the main reason I don't is im trying to run a stock setup for now, im only running 8 psi which with my 9:1 compression works out to be just over the 'boosted compression' of a stock tsi. (boosted compression = cylinder compression * ((boost psi/14.7) + 1). Therefore I should be obtaining the same fuel trims as a stock tsi. correct me if I'm wrong. but since my mas is hacked I think its giving me a lean situation at all rpms. I'm hopefully getting my hands on a unhacked this weekend just for test. But as for that IC opening up, it did really seem to help! I'm going to get some sheet metal and build a little tunnel for it this weekend to help direct all air flow on it. Also to answer your other questions, I actually set the base timing a couple days ago dead on 5 and my injectors are stock 450s matched with a m/t ecu and m/t fpr

[kjewer1]

I wouldn't go running around at WOT all the time until you get the timing figured out. Part of it could be the super low boost, but I would wait until you test with a stock sensor.