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Been having an issue for years with my 2015 wrx being unable to reach stock boost levels at low rpm with stock parts (turbo dynamics integral +10 on stock tune). Additionally, the feedback knock correction randomly goes to -12.1 under acceleration, dam drops, dropping timing suddenly and causing the car to slow down instead of speeding up (dangerous).
Did the practical reflash tuning course to help figure out the issue, but to no avail. Had some boost leak but those were fixed. Have already replaced wastegate, boost control solenoid (tried both stock and aftermarket), turbo changed, bpv changed, exhaust manifold changed, high pressure fuel pump, smoke tested.. and any boost leaks fixed but the issue persists.
Currently, I've had to drop the target boost and wastegate duty cycle below stock for the DAM to stay up and for the car to remain driveable. I've attached a log from last night and screenshots of the current map.
Any help would be greatly appreciated. Only target boost and wastegate DC have been changed. Solenoid frequency set to 15hz as the current solenoid is the grimspeed 3 port. There a perrin bpv and a grimspeed chargepipe. No other mods. Stock solenoid make no difference to the situation..same issues. I've also attached the stock maps for comparison (higher boost targets and wastegate DC).
Not even looking to make the car faster, just need it to at least run like stock.
Attached Files
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subaruEdit_SSM_2025-03-29_22-03-41.csv
