03 Jan 2005, 03:27 pm
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Senior Cruiser
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Join Date: Jan 2003
Location: Huntington Beach, CA, USA.
Posts: 1,558
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Quote:
quote:Originally posted by MichaelDay
Although I don't know the answer to the question, the stock PCM on the '03 would assume that the stock injectors were in place and probably cause the larger Stage 1 injectors to push too much fuel making a richer mixture. Since the GT runs somewhat rich anyway, I wouldn't think that would be a good thing for emissions. The PCM might or might not know to back off the mixture. I'm not sure the OBDII test would know the difference for a short time which MIGHT allow you to pass the test. Unfortunately, all this is just conjecture until someone actually either passes or fails the OBDII test with Stage 1 in place or with the Stage 1 injectors and the stock '03 PCM.
Unfortunately, I don't know anyone with an '03 that has tried it either way to find out.
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Not sure about passing smog but you are right about the car running rich. The PCM has the injector size programmed into it. It interprets the sensor inputs and sends a signal to the injector for a pulse width @ a given fuel pressure. A bigger injector will flow more at a given pulse width and you will run richer. Same if the pressure is greater than is programmed.
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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