I recently install the vf30, injector and fuel pump on my 02 wrx. Currently I am running Ap stage 2.5 with vf30 mapping, both real time map and base time map. This is the problem, my car can't hit full boost. It only boost up to .8 bar. When I was in stage 2, I can hit full boost all the time. Anyone has this problem with the 2.5 mapping? Can I use a boost controller with the AP? Thanks for any information.

stop...ya don't want or need any boost controller.

ya need to figure out just exactly what the hell you are doing before ya blow it up.

take it to someone who can tune it properly

I recently install the vf30, injector and fuel pump on my 02 wrx. Currently I am running Ap stage 2.5 with vf30 mapping, both real time map and base time map. This is the problem, my car can't hit full boost. It only boost up to .8 bar. When I was in stage 2, I can hit full boost all the time. Anyone has this problem with the 2.5 mapping? Can I use a boost controller with the AP? Thanks for any information.
You are most likely missing the restrictor pill in the vacuum line coming off your compressor housing. Please check there to make sure you have the proper sized restrictor pill.

Take care,
Christian.

It needs to be the stock one FYI.

Thanks guys for all those information.

+1 for the pill

Any update? My friend with the same problem used a spring from home depot. He's hitting target boost, but isn't really making full power. He had used the restrictor pill from the stock turbo as recommended.