Me and my buddy have been working on his 2019 Malibu and the car was running well only problem was that I couldn't get the manifold pressure up. Boost was reading around 20 psi but manifold pressure was only up to 8 psi. Car was running strong. Now we installed a catless downpipe and I deleted the codes for the cat and turns catalyst test off. The car runs great in wot but going from cruising to half throttle will aggressively cut fuel and close the throttle really quick. I could not find what table is causing this. I have tuned many LNF cars and I understand how the tables work in relation to each other. This one has me stumped on what is causing the issue.
I lowered the wastegates duty cycle, maxed out over boost and underboost tables, lowered timing to avoid knock and also increased knock airmass tables a bit from -2 to 0 and no change. WOT runs great but half throttle does not. It does not knock when this happens but actual boost goes over desired boost by 2 or 3 psi. Any suggestions on what might be happening? I can send a log to anyone that wants to look over it. Thanks