Like I stated on a previous post, my fuel delivery below boost is 100% stock with zero alterations. At boost, two additional injectors (right before the throttle) provide the extra fuel and are controlled from a Split Second "Extra injector controller". Another Split Second item is a voltage clamp at the mass airflow meter so the ECU never sees "above stock" airflow. Right now I only have water methanol injection (Snow Performance) to cool down the charge, but we're working on a custom intercooler setup. I recently got my (internal) wastegate ported and resized because of substantial boost creep. Have a Turbonetics BOV, MSD spark retard with cockpit control and a manual boost controller made in Aussie land. Also have cockpit mounted AEM wideband AFR gauge, AutoMeter boost, fuel pressure and intake air temp gauges.
I see boost building up to about 7 to 8 PSI but I'm not that impressed with the power it is making. I own a V8 XJR for reference and there's just no comparison in power. My AFR at full throttle is between 11.8 and 12 with the W/M starting to shoot at about 5 PSI. If I keep my foot on the floor, it still wants to creep up to 10 PSI, problem is that when it shifts (auto) the boost must be spiking because it back fires (loud caugh from underneath). I'm failing to determine what is limiting the power that appears to be missing. Maybe I need to shell out $700.00 and get a pro tune (again)? Last time the tuner could not make power and gave up, but still cost me $700.00. (turns out that I had a plugged catalyst) "Don't know the car enough to know why I'm not getting power", he said. The only thing I have not done myself is to alter the fuel map with my laptop. I think that the AFR indicated is fine and I wouldn't know where and why to start altering it.
What do you think, mate?
