Ranchero5.0
The Voice of Reason
Slvr, seems interesting that they want it to run 'slightly' rich during normal running with the blower. I don't really agree with that or their statement that the o2's will foul on a blower car during normal running. Raises a BS flag pretty quick.
In my opinion with the EPEC the engine should run normally asperated until it goes under boost and should run closed loop through the o2's as lean as it needs to keep the emmisions down. Then under boost the fuel pressure should be raised 1-1 to keep the flow rates the same and the WOT setting richer to compensate for the boost. With my setup as old school as it is, the FMU boosts the fuel pressure to compensate for boost and you use different plates and bleeders to 'calibrate' it. The downside is it'll go lean for a split second as you shift because the lack of boost on the shift leaves the FMU reduce pressure. The upside is the injectors are smaller so the MAF calibration has an easier time controlling the mapping. Crap, the '03 cobra's are clean and make gobs of power with o2's without fouling. I understand they monitor the MAP to compensate for boost, a better and truer method vs a FMU or guesswork with the EPEC.
Seems that in your case you need it to run clean and then make decent power, not make lots of power and not run clean. By not running the o2's just like they say, it's not going to run as clean with weather or temperature changes. If it doesn't run clean or is tuned to run rich all the time then you are just pissing into the wind and your overheating cats won't go away. You might as well rip the EFI off and put a carb and carb bonnet on and blow boost through that.
Jamie
In my opinion with the EPEC the engine should run normally asperated until it goes under boost and should run closed loop through the o2's as lean as it needs to keep the emmisions down. Then under boost the fuel pressure should be raised 1-1 to keep the flow rates the same and the WOT setting richer to compensate for the boost. With my setup as old school as it is, the FMU boosts the fuel pressure to compensate for boost and you use different plates and bleeders to 'calibrate' it. The downside is it'll go lean for a split second as you shift because the lack of boost on the shift leaves the FMU reduce pressure. The upside is the injectors are smaller so the MAF calibration has an easier time controlling the mapping. Crap, the '03 cobra's are clean and make gobs of power with o2's without fouling. I understand they monitor the MAP to compensate for boost, a better and truer method vs a FMU or guesswork with the EPEC.
Seems that in your case you need it to run clean and then make decent power, not make lots of power and not run clean. By not running the o2's just like they say, it's not going to run as clean with weather or temperature changes. If it doesn't run clean or is tuned to run rich all the time then you are just pissing into the wind and your overheating cats won't go away. You might as well rip the EFI off and put a carb and carb bonnet on and blow boost through that.
Jamie