What is the most amount of safe boost that should be requested on a MK4 TDI 130/ 150 Remap?
Same for a 1.8T AGU?
Out of curiosity
There are a lot of other factors to take into account when talking safe boost, EMPs EGTs, Knock control, lambda ect..
Safe held gains upto around 4000rpm on a VNT 17 A / B would be around 4 / 4.5psi
A stock 130PD request is 1.32bar with 1.55bar over shoot, Most stock 130PDs will see upto 1.7bar spikes due to sooted up VNT control. At a remapped 130pd can see a 1.63bar request, then if you can reduce the EMPs & EGTs with a turbo back exhaust then you can run more boost in the inital spike in the midrange. Limiting factor with boost and VNT17 is mileage the window around 110-130k is where the start to fail stock or tuned, and the customer who thrashes the car for cold. but saying that I have a few stage2 115pd 130pds 150pds 160pd which still going strong with over 180k and a 130pd passat taxi mapped with 325k. 150PD mapped will run a request line around 1.75bar from 1.5bar (again even in the stock map it can see 1.9bar). and the 160pd 1.55bar. Then the 150PD hybrids run 2bar across the whole band.
K03 stage2 can (if the actuator is upto it) peak 1.5bar and taper down to 1bar as it wont hold the boost due to the turbos volumetric efficiency. A K03 will run flat out 200bhp with the actuator shut solid and be happy for many many year.
I am running 21psi to the 7500rpm on my AUM from my own built hybrid turbo, and a customer with an AGU is running a T3-04e at 27psi and our astra 2bar at 8000rpm 500bhp
But boost is a factor of the rest of the tuning, you cannot run high boost with a lean fuel strategy.
To get a picture of what boost everyone is running on there map just search google for vagcom logs.