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General => General discussion => Topic started by: Dizzie on 08 May 2014, 15:48

Title: strange turbo left off noise - like a HGV
Post by: Dizzie on 08 May 2014, 15:48
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?
Title: Re: strange turbo left off noise - like a HGV
Post by: barrym381 on 08 May 2014, 21:28
a f**ked turbo  :whistle:
Title: Re: strange turbo left off noise - like a HGV
Post by: Rhyso on 08 May 2014, 22:18
a f**ked turbo  :whistle:

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

Ironically its when mine stopped making the noise that it expired........
Title: Re: strange turbo left off noise - like a HGV
Post by: barrym381 on 08 May 2014, 22:19
a f**ked turbo  :whistle:

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

Ironically its when mine stopped making the noise that it expired........
same happened to a mates a3 diesel  :grin:
Title: Re: strange turbo left off noise - like a HGV
Post by: clancy on 09 May 2014, 18:29
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
Title: Re: strange turbo left off noise - like a HGV
Post by: oakgreen_91 on 09 May 2014, 22:45
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.
Title: Re: strange turbo left off noise - like a HGV
Post by: clancy on 09 May 2014, 23:36
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
Title: Re: strange turbo left off noise - like a HGV
Post by: baka on 10 May 2014, 00:45
They call it the 'pigeon mod', popular with drifters and S13/S14's etc. Removing the dump valve completely.

Pigeons! (https://www.youtube.com/watch?v=-uPcQ8vvjY0)
Title: Re: strange turbo left off noise - like a HGV
Post by: JC on 10 May 2014, 03:29
a f**ked turbo  :whistle:

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

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


 :laugh: :laugh: :laugh: :laugh: :laugh: :laugh: :laugh:
Title: Re: strange turbo left off noise - like a HGV
Post by: Rhyso on 10 May 2014, 06:25
How do you remove the dump valve on a diesel?? :whistle:
Title: Re: strange turbo left off noise - like a HGV
Post by: sharki786 on 10 May 2014, 13:35
A mate of mine had it on his diesel. He said he put a cone filter on. Some say decat makes the HOWL noise.
Title: Re: strange turbo left off noise - like a HGV
Post by: hobbiniho on 10 May 2014, 14:13
How do you remove the dump valve on a diesel?? :whistle:
iv heard that the best way it to use a adze but you need to be very careful as they can be difficult to work with and you might take more than the dump valve off  :grin: :laugh:
Title: Re: strange turbo left off noise - like a HGV
Post by: barrym381 on 10 May 2014, 14:47
A mate of mine had it on his diesel. He said he put a cone filter on. Some say decat makes the HOWL noise.
:laugh: :laugh:
Title: Re: strange turbo left off noise - like a HGV
Post by: sharki786 on 10 May 2014, 19:37
A mate of mine had it on his diesel. He said he put a cone filter on. Some say decat makes the HOWL noise.
:laugh: :laugh:

Or you could buy a wolf and drag thag around
Title: Re: strange turbo left off noise - like a HGV
Post by: thai-wronghorse on 11 May 2014, 20:21
Decatting a mk3 TDI definitely increases the 'twit twoo' effect.
Title: Re: strange turbo left off noise - like a HGV
Post by: bamfish89 on 16 May 2014, 18:35
my mates bora did this its a 1.8t and all he did was stick a cone filter on it and it made that noise.
the turbos still goin strong today so carnt be a f**ked turbo.