Adrenalcookie

So I turbocharged my 1.6 using a eBay turbo, cast manifold, rx8 injectors and a speedy efi ecu, now I have it up and running but whenever I hit exactly 5.5 psi or 137kpa, it just hangs and the car pretty much reboots as best as I can describe it. I can’t find the cause as the spark plug gap is not overly big and I checked the sensor with a syringe and it does indeed read past 137. Anyone here ran into a similar issues?