strange turbo left off noise - like a HGV

[Dizzie]

HGV's make this weird noise when they shift gears. I was always told it was the waste gate by a mechanic friend. it's hard to describe the noise. kind of like a Owl haha.

the other day I heard a bora make the same noise.

any idea what makes it do that?

[barrym381]

a f**ked turbo 

[Rhyso]

a f**ked turbo 

Well then Steve's was f**ked for over 70,000 miles 

Ironically its when mine stopped making the noise that it expired........

[barrym381]

a f**ked turbo 

Well then Steve's was f**ked for over 70,000 miles 

Ironically its when mine stopped making the noise that it expired........

same happened to a mates a3 diesel 

[clancy]

You on about turbo chatter ? Like a fluttering sound ?

It's caused by air going back through the turbo. Some set ups give more chatter than others

Or to get a very loud chatter you remove the dump valve basically. Not great for the turbo though

[oakgreen_91]

You on about turbo chatter ? Like a fluttering sound ?

It's caused by air going back through the turbo. Some set ups give more chatter than others

Or to get a very loud chatter you remove the dump valve basically. Not great for the turbo though

Some old school turbo cars come like this from the factory, Renault 5 GT Turbo being one example that I have personal experience of....no diverter or 'dump' valve as standard and those engines are pretty reliable.

[clancy]

True but it was designed that way

Running without one probably won't be an issue on low boost, but I wouldn't want to run high boost without one on a set up designed to have one

[baka]

They call it the 'pigeon mod', popular with drifters and S13/S14's etc. Removing the dump valve completely.

Pigeons!

[JC]

a f**ked turbo 

Well then Steve's was f**ked for over 70,000 miles 

Ironically its when mine stopped making the noise that it expired........

 

[Rhyso]

How do you remove the dump valve on a diesel??