bean962

I appreciate I can change the ECU to a Power FC but Nissan didn't design the car to run like this so fitting a power FC will only mask the problem and no diagnose the reason.

Thanks for all your constructive replys Yes it stutters at 4500 and then at 6000 clears its throat and bang....BHP up to 260 I've replaced the o/e ECU with a standard unit The plugs are greddy Standard boost Ignition retards to 4 or 5 deg at 4500 and then goes back to 16/17 at 6000 The voltage on the AFM goes off scale at this RPM but the turbo pipes have been checked and no leaks found. I'm buggered......

Sorry, I've only had a skyline for a week and I just thought the Aussie club would offer better advise than our UK forums. The car is completely stock except big bore front pipe and de-cat pipe. Is the problem likley to be the boost solenoid? Regards

Hello all. I am so angry I cant find the reason for this so I'm offering a reasonable reward for the soloutiion. I have an R33 GTS-T and a massive flat spot at 4500 rpm until 6000. I have replaced or changed:- ECU New Coil packs (for splitfires) New Iridium plugs AFM CAS Ignition amplifier Knock sensors The diagnostics say the ignition retards to about 5Deg at 4500 rpm and then goes back to normal 15/17 deg at 6000. Obviously during this period its running rich, so any ideas?