Ok so my car likes to drop pressure to around 7-9kpa at wot. I have a brand new hpfp and lpfp, 02 sensors, coils, plugs, blow off valves and intercooler pipes (had a boost leak too).
The car doesn't drop pressure on my lower boost tune or stock tune. Only when running the "average" boost level tune from gearhead. It should be able to run this tune just fine, it's nothing special. I don't have bigger turbos or xdi or anything crazy done to the car. Ortiz also couldn't finish tuning due to the pressure drops, we had to keep a lower boost tune.
When I had my boost leak, the tunes all held pressure perfect, cause I wasn't hitting that much boost. As soon as I hit like 15psi it'll drop and won't recover to anything above 10 or 11 kpa at wot.
Any ideas what to check next? Could this be the most my stock fuel system can handle or do I have a bad part I'm still chasing? I had assumed something must be wrong cause 2 tuners are telling me they normally run these levels just fine on cars with my kind of set up.
Also not sure if it's worth noting but the pressure dip worsened slightly after putting in new 02 sensors while chasing the problem. Tuner says he believes the sensors were going bad and asking for more fuel which made the pressure a little better. I find it odd that it would have gotten better pressure then but can't now tho