i have a greddy profec b 2 boost control. It came installed with the supra when i bought it. i read the manuels and did what it says, the problem is that it will not boost the turbo. i want to boost up but it keeps on staying at boost 6. low and high boost. right now its under psi not kpa. and at low boost, when it hits 6psi, it goes negative right away once reached. but when at high boost, it stays on 6. is there any suggestion out there?