2.5TDi Dumping Boost / Compressor Surge

[AlexGSi2000]

Just wondering if anyone could help me out on this one, as the car seems to be dumping boost under full load.

I was having a spirited drive around the country roads last night, under full load lower down the revs (around 2,500-3000rpm) the car was dumping boost and giving the sound of compressor surge, then picking back up again.

The car has a remap, full stainless exhaust and had the EGR blanked - Is it likely to be the N75?

 

[AudiAndy21]

mine used to do this mate but... never made a difference to performance? can you tell on yours?

i had an open filter ( cone) so you could realy hear it

 

[adamss24]

Either a crap map or the air intake pipe is collapsing- had the same issue on fjtwelve's remapped audi a6. Thought it was fuel starvation at first. Any fault codes ?

 

[AlexGSi2000]

Intake pipe collapsing! - nice... I haven't spotted any aftermarket TIP's for the 2.5, guessing I will just have to live with it?

No fault codes whatsoever!

 

[swarcup]

can i ask what happens when you say dumping boost, just in case mine does this and im unaware

 

[AlexGSi2000]

can i ask what happens when you say dumping boost, just in case mine does this and im unaware

Sorry, my own terminology there - the turbo stops providing boost pressure and then re-builds.

This is the sound im getting, but under full acceleration - SR20DET Compressor Surge - YouTube