After installing my downpipe and flashing Cobb Stage 2 OTS map on my 08 Spec B, I noticed it overboosting, I reflashed to low wastegate tune and still was getting some overboost. I was talking with a couple tuners and getting different opinions, varying from needing an external wastegate to the downpipe divider obstructing the internal wastegate. Then I noticed that it was peaking a little over 15psi (Cobb's notes were saying peak should be 16psi +/- .8) and stopped overboosting after about a month of driving. The tuners I talked to said before this that the ECU's learning doesn't affect the boost control and wouldn't be the cause of overboosting. I tried resetting the learning, and it overboosts again. So did the tuners misunderstand how it works or is there another potential issue?
I also did a smoke test to check if I have leaks anywhere and found smoke coming out from the plates opposite of the TGV motors on booth housings, is that normal or could there be a bad seal?
Stock/Mod list:
Stock intake, stock boost control valve, stock bypass valve, Invidia turbo back (lower cat), Grimmspeed TMIC, Perrin turbo inlet hose