[pag]

Being new to driving a car with a turbo, I wonder if more experienced turbo drivers could help me confirm the sounds that I am hearing from my new 9-3 2.0t Vector.

I am now familiar with the whistling sound produced by the turbo when accelerating, but have also noticed what I can only describe as a slight whining noise when the turbo guage shows the pressure decreasing (i.e. when lifting off the accelerator when on the motorway). Is this as expected ? It is not a particularly loud noise and cannot be heard if the stereo is at a decent volume, but I would like to confirm that this normal for a turbo.

Thanks

 

[black_linear]

There should not really be any noise from the actual turbo as you are deaccelerating, the bypass valve should do just that... Only noise should be the slight pssst sound when the pressure is released from lifting off the accelerator.

Does your turbo gauge go all the way to bottom when deaccelerating? It should be at the lowest end of the gauge, lower than when it's idling.

 

[b.r.i]

There should not really be any noise from the actual turbo as you are deaccelerating, the bypass valve should do just that... Only noise should be the slight pssst sound when the pressure is released from lifting off the accelerator.

Does your turbo gauge go all the way to bottom when deaccelerating? It should be at the lowest end of the gauge, lower than when it's idling.

Uuuhh, which is where, mines never drops below about a 1/4 way from the bottom...even befoe the PPC :cheesy: .

Pssst sound is normal to be honest, wouldn't worry about it at all.

Brian

 

[pag]

Thanks for the replies.

The turbo guage does go slightly below its normal idle position when decelerating. At idle the gauge is probably a quarter of the way across.

Thanks

 

[edusaab]

One question.....

you have a clicking noise when desaccelerating?? when the car is stoped and without any gear engaged, you accelerate a little and then when you leave the accelerator, you listen a clicking/metalic noise?? then could be the wastegate valve has a little movement.

when you are reducing your speed(using the engine brake), under 3000rpm you listen this metalic sound?


greetings

 

[pag]

There is no clicking noise when decelarating or when allowing the engine to return to idle after revving the engine in neutral. It appears to simply be a small whine/whistle only when "engine breaking".