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Extreme Beginners

The basics of EFI tuning. Posted for the n00b in all of you. This set of articles is meant to inform on why we tune the way we do. Enjoy.
Dan0974's picture

Air/Fuel Ratio's and What They Mean

Wed, 07/15/2009 - 10:31am — Dan0974

Air/Fuel Ratio Basics

Dan0974's picture

How a Four Stroke Engine Works

Wed, 07/15/2009 - 10:21am — Dan0974

The K20Z3 motor is what is called a four stroke engine.  This means that each cylinder has four steps to its function.  The stroke of a cylinder is the movement of the piston in an upward or downward motion.  The first stroke or cycle begins when the piston is at its highest point called top dead center.  From this point the piston begins to move downward.  While this is happening the intake valves open letting air and fuel to mix into the chamber.&nbs

mucter's picture

LTFT and STFT, why do these matter so much?

Fri, 07/10/2009 - 12:36am — mucter

Fuel trim refers to adjustments being made dynamically to the base fuel table to get the proper ratio of fuel to air. Short term fuel trim (STFT) refers to adjustments being made in response to temporary conditions. Long term fuel trim (LTFT) is used to compensate for issues that seem to be present over a much longer period. Fuel trims are expressed in percentages; positive values indicate lean (add fuel) and negative values indicate rich (subtract fuel).

Dan0974's picture

Getting to Know Your Engine

Tue, 07/07/2009 - 6:31am — Dan0974

Engine Basics & Common Terms