Originally Posted by
Nick Mann
I'm not familiar with that boost controller, but hks controllers usually have a learning mode to understand the application they are in, so you can then control the boost easily. It may be worth googling your model.
The stock ecu will not like air flow above around 1.0bar and will fuel cut if you set the boost too high. You will get fuel cut in higher gears first. Fuel cut happens at a certain air flow, not at a certain boost pressure, so your maf condition, pipework leaks and the temperature of the air will all have an affect on when fuel cut arrives.