thats is the prob..there is no dyno in kuching...im not sure about the fuel pump rating...n i dont have wideband a/f ratio meter....as for the fuel press it is when the engine start...but my mech said hi already tune my pressure using his computer and he said there is nothing wrong..but before this my fuel press is 6.75 when the engine start...Ok, try with your original ECU (but u may need to re-tune lower or if can re-flash to compensate for your current set-up). Your 3.75 bar fuel pressure is at what gear? And at what boost and rpm?
What fuel injector and fuel pump rating u using? Do u have a wideband A/F ratio meter installed?
Do u have friends that can lend u a standalone ECU if your original EUC still stock?
Btw, do they have a dyno machine in Kuching?