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== Speed Density ==

Speed density is a tuning methodology where fuel and/or timing is determined by the speed (RPM) of the engine and the density (bar, psia, etc) of the intake air. 

Many aftermarket [[standalone]] or [[piggyback]] systems use a speed density system, as well as older cars.  However, most modern factory vehicles use [[mass air flow]] systems. 

=== Advantages ===

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=== Disadvantages ===

Speed density requires tuning many maps for consistent results, such as air temperature compensation and engine volumetric efficiency.  Manifold pressure sensors do not react quickly to rapid changes in pressure.