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Nah, it doesn't run way lean. All of the wideband afr measurements on stock engines have come from O2 sensors placed after the catalytic converters. Cats tend to lean out the afr signal. My wideband O2 sensor is before any cats. With the Impreza RS fpr installed in my car, the afr is too rich during aggressive driving (ranges from 12.5:1 at lower rpm to 11.5:1 at redline). I want to reinstall my stock fpr and get some afr measurements, but so far, no time to do the exchange. I'm guessing that with the stock fpr, the afr will range from 13.5:1 at low rpm to 12.5:1 at redline which would be a just a little lean at low rpm but spot on at high rpm.
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Mychailo
:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
1995 Laguna Blue SVX L AWD 5MT (sold)
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SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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