Has anyone noticed that their turbo surge is coming on at higher rpms than it did in the past? The surge in power from the turbo kicking in came in around 2500-2750 rpm before, now it is around 3500rpm. The one thing i did notice is the sound of rattling before the turbo kicks in, and then a thwump noise(not real loud, like the sound of a vacuum closing) and then the car goes. Past experience has me leaning towards wastgate or actuator not closing tightly(the rttle and delay in power) then when it does(thwump).
Does anyone know where the wastegate is located on the engine. I would like to see if the actuator arm is loose or if there is any play in it.
Anyone have any ideas ?