[charged]

Originally Posted by Sledgehammer

I have never owned a car with a turbo so let me know if this is a usual thing. At hw speeds, 60/70 mph, a peculiar thing happens when I push the pedal down half-way. The car will start to spool the tubro (usually the rpms are between 2.5k and 3.4k) what will happen is the engine will variate from pulling hard to nothing and back again quickly. By quick I mean 3 or 4 times a second. During this time I can hear the turbo dumping air through the wastegate and respooling. The sound cooresponds with the engine pull. After 4k rpms it pulls smoothly again. I have been having this trouble for around 5k miles now and it is really bothering me.

On a side note, I hit the car hard in second gear at about 20 mph/>3k rpms and it pulled hard till it got to 5'n change rpms and suddenly the turbo dropped out. It spooled back up again immediately but their was certainly a lack of power. Any idea the causes or is this just a usual thing

Do you run a BOV?, what seems to be happening is when you change gears or back off the boost your making is trying to escape through the turbo as the throttle plate/body is closed and the noise your hearing is the backpressure of boost against the vanes. A BOV will fix this problem , just get a quiet one. Its actually detrimental to the turbo as it puts extra load on the bearings.