So, this morning, car was 100% fine as it normally is. Started getting annoyed with the slow OAP in front of me, dropped it down into 4th at 80, and planted my foot. All of a sudden, theres a **** load of soot that comes flying out the back, to the point I cant see anything behind me, then it starts overboosting....

 

The rest of my 32 mile journey was full of overboost, and random large clouds of soot being thrown out. What could be causing this?

 

2006 Fabia VRS

100k miles

Std map

Decat + mufflerectomy

 

 

Nothing like this has happened before, there are no codes, or warning lights :/

 

Thanks Guys and Gals!

Loose turbo pipe, usually comes loose or detached on full throttle and quiet a common problem on the Fabia vRS.

Yeah, I have had that before, but Ive replaced all the pipes and clips only 4k ago :S and it wouldnt explain the overboost?

Only other thing I can think of are sticking turbo veins.

I may be wrong (sure I will be corrected)

But isn't a 0 exhaust system on a standard map bad due to the vnt turbo needing a little back pressure

I'm sure I was told that mapping needs to be changed for decat bla bla bla to avoid 'over spooling' or something silly....

I may be wrong (sure I will be corrected)

But isn't a 0 exhaust system on a standard map bad due to the vnt turbo needing a little back pressure

 

It will lose a little power compared to the standard exhaust system but won't affect reliability.

 

I'm sure I was told that mapping needs to be changed for decat bla bla bla to avoid 'over spooling' or something silly....

 

An ECU controlled VNT cannot 'over spool' unless it malfunctions.

 

This has to be caused by a boost leak, sticking vanes or a faulty actuator.

sounds like sticking vanes or a boost leak to me. is it going into limp mode?

take a read of this page, yes it for a golf but good info here http://uk-mkivs.net/topic/50753-sticking-vnt-mechanism/