They way I understand surge is that airflow stops because it cant go anywhere, except bleed back out the turbo inlet, so would I be rightin think that airflow stops or even reverses to an extent?
I remember my old highflow would surge like crazy at around 3000rpm in 5th when cruising down the highway, send the PFC Haywire and the motor would cough and splutter then clean up for a few seconds and repeat
could hear it surging a mile away...like a Chappel st VL lol
driving down the highway going tutuutututut constantly