i have a boost gauge and a boost controller and i can change my boost up to 1 bar no problem, the previous owner never mentioned a FCD and im at an elevation of about 5000 ft if that matters to much. what are the signs of a FCD.
What year is your car? If it is a 93+ I think your fuel cut may be a little bit higher. If there is an aftermarket fcd you will need to check the electrical connections at the pressure sensor and see if anything is spliced in... also check at the ecu.
1. Your boost gauge is messed up.
2. He switched over to a '93 Pressure Sensor (not likey)
3. There is an FCD in there.
I'd check the boost gauge first... if you have a bike pump or any way of applying a selected amount of pressure... you could hook that to a vacumm like to your boost gauge... and see if the pressures match.
^ 1bar is pretty damn close to 15psi. I think it's like 14.5. I agree with Lachean... see if there is a vacumm hose coming out of the pressure sensor. It's a little black box in the right rear of your engine bay... says pressure sensor on it. Should have some electronics coming in the side... and a vacumm line coming out of the bottom. If there is no line.... you have NO fuel cut. Doesn't mean there is an FCD... just no fuel cut.