ok check this out, after driving from dj'n tonight I was crusing along 60mph, when I decided to bump it to 70mph, Boost got up to 10PSI and all the sudden started to " bogg" down, i got up to 70, but ever time the boost got above 10psi it done it again!! need some help with this one...

Year-99
a4-1.8t

the rest should be in my signature..

 

dood their is no way to diagnose this over the internet.

i'd start buy going over ever single boost and engine management mod you have to make sure its done right and working right.

 

I know.. Couple of people told me to do a couple of things , so far it has not done it ..

 

from leaking boost, to your ECM not reading the chip or flash correctly.... then just the number of mechanical issues that could have failed are long standing.

its hard to say, we'd have to see it and hear it to even be able to begin

 

Sounds like a clogged fuel filter. Under vacuum or low boost there isn't enough obstruction to see a problem but once you really start asking for fuel it can't flow enough and you're losing power.

Another potential issue is the GReddy blowoff valve you're using. Get rid of it right now and use an aftermarket diverted valve to avoid those rich spikes you're getting every time you shift...which are slowly clogging your cat and fouling your injectors and may well have gotten with of those shitted up enough to cause the issues you're having. Blowoffs are fine for some cars. Turbo Audis aren't on that list. You can take that to the bank.