I realize your spelling/grammar issues are being blamed on auto correct but it's not that hard to type properly on a phone. It makes it a lot harder for us to help diagnose your issues when we can't understand. Where did anyone recommend that you unplug the fuel pump relay and keep cranking? That won't build pressure... You need to use an air compressor to pressurize the fuel rail and look for the pressure to leak down. There are really two things that this could be, considering you just replaced injectors and ECU. A) Wrong ECU B) Injector O-ring(s) pinched Most Z exhaust systems have some crossover tube, whether it be an H or X configuration. This means you can't tell for certain where the smoke is coming from, left or right bank. Also, if you pinched one o-ring because you weren't careful, it's not hard to believe you pinched more. Personally I would recommend that you take all of the injectors out of the fuel rail again, inspect the o-rings for damage. Liberally lube the injector o-rings with Vaseline or motor oil and press them into the fuel rail while twisting. Also you should confirm that your ECU chip was for 615cc Nismo injectors.
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