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an Apexi S-AFC is an air/fuel controller. Basically, what aftermarket chips do is recalibrate your ECU map and your air/fuel mixture to give you more power. The object of the game is, to get your car as lean as possible without knocking a.k.a. detonation.
As far as the wideband tuner, all cars are equipped with narrowband oxygen sensors, which of course measure your air/fuel ratio. A wideband puts it on a different scale making the A/F ratio a lot more accurate. By getting an S-AFC and hooking your car up to a wideband tuner, you can use the S-AFC to lean out your fuel a bit as you see it needing to be done along the fuel curve without leaning it out too much, in which you will see a little bit more power.
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Daily Driver: 2004 Jeep Grand Cherokee Special Edition
1994 Mitsubishi 3000GT SL-TT Automatic - Black
3.05 L Arias Forged Pistons, Pauter Forged Rods, DR Stage 3 heads, 3SX TD05 kit w/ E16G's, CX Racing FMIC, 550cc injectors, Walbro 255lph pump, + supporting mods
1994 Mitsubishi 3000GT VR-4 - Black
Intake & Boost Controller so far
2006 Sea-Doo RXP Supercharged, Updraded SC, IC + supporting mods
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