I just rebuilt a s4 13bt using s4 na rotors with used bearings. I noticed that there is a knock at idle. Once I rev it it goes away. Starts everytime. Drives good, no deteonation that I can notice. No a/f gauge...but it pulls hard. Has 75-80 psi oil pressure. Can't here no knock when I'm in boost. Only 6-7 lbs boost. Could I still have a spun bearings? Just hit 50 miles on the rebuild. Using RA classic seals. Any ideas? Thanks.

 

How loud is the knock. Could just be the bac ticking or the injectors ticking

 

I have no BAC. It's not that loud and it seems to be inconsistant. And I just put the exhaust on as it was open dp and now it sounds like its coming from the back. I put my ear to the tip of my exhaust and it kinda sounds like its coming thru the exhaust. Idk, oil pressure is still high. Got 70 miles on it now. Still running fine. Occasional hot start. But the idle is going up the more and more I drive it. I do have the twin scroll still. Maybe the door is clanking?? I'm trying to find time in my work week to put it on a rack. Any ideas would help. Thanks