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my mk3 sport has no noise coming from the turbo apart the normal whistle when it starts pushing air.
Remember that these cars have no wategate.
Remember that these cars have no wategate.
mojogoes
Guest
You do get churping on the waistgates but this sometimes means it needs cutting back on the exhaust side, but this being a vnt sounds like it could be the bearings have you lost any oil check in the intercooler.
mojogoes said:
How exactly can you get chirruping on the wastegate? The wastegate opens on boost to control the boost level and stop the turbo blowing itself and the rest of the engine to bits. When you lift off, boost drops and the wastegate slams shut - if it does anything else it's fecked. Any noise you get from the wastegate would be on-boost and would be a whitstle or similar noise of air passing through it. No chirrups, squeaks, pops, bangs or whooshes.
The dump/divertor valve opens when the throttle is closed to give the trapped boost somewhere to go, but they whoosh if you can hear them at all.
If the car makes compressor stall noises then maybe the DV is stuck closed?
I don't think that diesel engines have DVs because they have no throttle valve to preserve. That's the reason why pop-offs are useless on diesel engines.
what a pain i love the sound of waste gate chatter (had an old rst fiesta) mite have to get a sound recording so i can listen to it in the LCR!
mojogoes
Guest
So am i right in thinking there's no point in dump valves or waste gate flutters with the durv's??
Yes you are right, if you search for diesel dump valve or blow off valve you will see its been covered in detail and they're useless. 
its not the throttle plate they protect its the turbine blades on the compressor side of the turbo as the throttle plate slaming shut means the boost has no where to go but back , thus slowing the turbo down or casuing damage.
and no diesels have no throttle plate , they are controlled by the amount of fuel not the amount of air and typically run lean.
2004, ok. There's a sort of a back-from-the-dead trend on these boards lately uh? Take it easy guys cos this forum only started in 2001!! 
Correct, it's more for the compressor safety.
Correct, it's more for the compressor safety.
Any diesel other than a TDI 90 doesn't have a wastegate, all the more powerful engines have VNT turbochargers, and the VNT replaces the wastegate as a boost control mechanism.
I strongly doubt your Mk.3 TDI Sport is a TDI 90 engine, but check the engine code to make sure.
I strongly doubt your Mk.3 TDI Sport is a TDI 90 engine, but check the engine code to make sure.
So how come the straight through Turbo-back exhaust systems give the car that fluttering sound??
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