More help needed

[Graham89]

Hi people i've been reading through some of the old posts on the forum and came across turbo chatter. I understand this is bad for the turbo so i was wondering how i stop it. My car has done it since i have had it. When you accelerate and let off it chatters through the airbox. Is this normal??

Also last night it was not picking up speed hardly at all in third but was fine in second, this has baffled me.

I have also noticed there looks to be oil around the back of the engine (top of g/box).
I am a complete noob to turbo cars but have basic engine knowledge.

Car is a 2001 1.8 20vt (180)

 

[Graham89]

Is there any way of testing the dump valve to see if its operating properly?

 

[adam cupra 20vt]

If your getting chatter I'd say the spring in the DV is to tight, what valve is it?

 

[Graham89]

Its all standard at the moment. Looks like the previous owner has had a fiddle about, the airbox does not have the pipe leading into it for the air feed. The airbox hose after the filter is only cable tied on....

 

[adam cupra 20vt]

Well a jubilee will help with that and the missing pipe is a good excuse to put a larger air feed into the box.

As for the DV, I'm not sure there is any way of testing the standard Bosch valve....good excuse to replace that to tho

 

[Graham89]

lol will look into the forge 007p one then as that seems to be the favourite on here.
Don't suppose you know what would cause the slow acceleration during third, Yet second was fine. So i am baffled!

 

[adam cupra 20vt]

Umm pass...

Maybe the MAF sensor is on its last legs?

The TIP being cable tied to the MAF prob won't help much, neither will a knackered DV.

I'd check obvious things first like split pipes, plugs etc.

 

[Graham89]

Cheers i will go and have a play although i'm not sure if i should be driving it with chatter!!

 

[adam cupra 20vt]

Bit of a silly question but is there actually a air filter in the box?

 

[Graham89]

Yeah its got a standard air filter in there (yellow one)

 

[Graham89]

I've checked the hoses and i can't see any splits or cracks in them. Just wondering if it is actually turbo chatter....You can hear a hissing/whooshing noise as you build up the boost through the revs then release the throttle and it makes a choo choo choo noise lol but fast. Exactly how i thought chatter sounds. I just hope its not killing my turbo.

 

[adam cupra 20vt]

Does it sound like this?

http://www.youtube.com/watch?v=K8nptFx1jug

 

[Graham89]

It's more like this http://www.youtube.com/watch?v=cPZZvd55hxg

not as loud but very very similar

 

[adam cupra 20vt]

Yeah it shouldn't do that, if you had an open cone filter you'd get a noise but not really a chatter like that.


Sounds smart tho

 

[Graham89]

uh oh lol well mine has got the airbox but no pipe leading up to the airbox. It's just an open end? I should have taken pictures really!!

This is more like it..http://www.youtube.com/watch?v=HAgZUKv0_8s

sounds identical to this

 

[leon cupra r]

Adam what the hell is that turbo chatter noise on the pikes peak climb video? that is the strangest chatter I think I've ever heard? something to do with anti-lag at a guess??

 

[adam cupra 20vt]

Adam what the hell is that turbo chatter noise on the pikes peak climb video? that is the strangest chatter I think I've ever heard? something to do with anti-lag at a guess??

I have no idea, my mates Fiat Coupe sounded like that with lots of boost and a large foam filter