Well got my car tuned yesterday and we had run into a problem with not getting enough fuel. using a Altronic SM4 ECU. we were hitting 95% on the injectors (nismo 555cc) around the 260rwkw, mark also have a Sard fuel pump in the car.
Anyway my mechanic said it is the Sard Fuel reg i have on the car was the problem. As he has seen this problem before on a WRX with a sard reg on it.
He over came the problem with a bosch fuel reg for a VL commodore on the WRX, and said the sard one wouldn't keep up or something along those lines.
so will be trying the standard one back on the car and see if that fixes the problem or do the bosch fuel reg upgrade....around $60-$80 mark.
any info on this problem would be great...........and calling out to Sydneykid for a answer!