The last time i drove it today it wouldnt hold any psi it go to 5psi and drop to 0

 

Also forgot to add the bov use to not blow off unless running more then 10psi now it blows off at 4psi

 

a bov should release regardless of psi, otherwise you kill turbos in no time due to surge. Make sure the wastegate has a line from a pressure source (between compressor outlet to the TB) and the bov has a manifold vacuum source.

basically like this but instead of the mbc, its the n75

 

yeah thats what i did when i changed the set up to the n75 when it was set up with the n75 the wastegate line fell off the wastegate and i put it back on and it was still only running at 5psi after it fell off but befor it fell off it was at 16psi and now it runs at 0psi like the problem keeps getting worse. so your sayin i should jus hook the n75 valve back up

 

yes, hook the n75 back in. If you still have boosting issues, you either have a massive boost leak or you overspun the turbo and killed it

 

ok thanks for all your help is there any noises to listien for if the turbo went bad? thanks again for all your help

 

also forget to ask if havin the wastegate line hooked stright to the turbo will kill/harm the turbo or wastegate

 

Sorry but that bugs me when people say that. These car's are almost like any other car... they don't run on black magic lol. Now if you say that about an RX-7 or hell even a Saab w/ the backwards engine I would take it but Audi's are no mysterious car.

 

yea idk the dealer i bought it from said they got it from another dealer when i hooked up the boost gauge it said 16psi and no boost controller

 

A dentist drill is usually a chewed up compressor, but that is if you actually make psi. As for location, as long as you are getting pressure source from the fitting on the turbo, you will be fine. Thats where the pressure for the wastegate is coming from on the pic i had above