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Products Trade ProECU Tuning Suites Honda Tuning Suite RaceROM Speed Density/Hybrid SD With Alpha N

Speed Density/Hybrid SD With Alpha N

The Speed Density (SD) feature changes the way the engine load is calculated. When SD mode is activated, the ECU will disregard the MAF sensor reading and will instead calculate mass air-flow based on engine speed, manifold pressure and air temperature. This feature can be useful in the following circumstances:

·  Extra large MAF sensor intakes have been fitted or air turbulence from the compressor wheel causing poor air-speed
·  The MAF sensor reading hits 5V at high RPM stability
·  An external blow-off valve has been fitted (when turbocharged)

In addition, the Hybrid Speed Density feature offers a combined MAF and SD configuration in which the transition from MAF to SD (or SD to MAF) can be calibrated against a range of activation thresholds such as engine speed, mass air-flow or manifold pressure.
The throttle-based 'Alpha N' option will suit an engine fitted with throttle bodies which use neither MAF or MAP sensor for the load input.



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