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The engine runs smooth, new nissan cold spark plugs, rebuilt stock injectors, hks blow off valves, intake, stock ecu.
When shifting through the gears it works great untill i get to 5000-5500 rpms and then the car starts to jerk and the rpms dont really want to go up, it feels like something is pulling the car back. I thought it might be a boost leak but after performig a boost leak did not find any problems. I ran a diagnostics and everything is dialed in. I thought the ecu is tripping, i installed my other ecu that was programed for 485 hks, jwt ecu, and the problem repeated but now at 6000 rpms.
I know it has somethin to do with fuel, but with working ptu, cas, and everything else i just dont know where to start. Could it be the injectors giving up? fuel pump controller? Maf treaping out? Sometimes going through the first it doesnt happen but then in second and others it does it. When goingon the freeway and excelerating pass 5000 rpm with out the boost gauge boosting you almost dont feel it but then when you boost at 5000 rpm or more it just starts this pulling forth and back.
Could it be because the adj waste gates are set at 11 pounds?
I have delt with many problems concerning z's but this troubles me. Any advise?
Thank you...............
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