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Message: <blockquote data-quote="lilvee" data-source="post: 1890074" data-attributes="member: 9652">I think i would like to share some...What does those Piggyback does to your Stock Honda OEM ECU?...Piggy Back controllers allow stock ECU to do things that they normally can't do, like run larger injectors or deal with boost. Remember that piggyback controllers work by altering sensor signals before they get to the ECUMost of the time, the primary signal being messed with is the MAP Sensor. This is critically important in a Speed Density car. The Map Sensor is used by the ECU Map Sensor signal - the ECU responds to the decrease in manifold pressure by supplying less fuel. When you "richen" a car with an AFC, you are simply increasing the Map Sensor signal - the ECU to guess how much air is going into the car, and therefore how much fuel to supply in order to match airflow. When you "lean" out a car with an AFC, you are simply decreasing the responds to the increase in manifold pressure by supplying less fuel. The change in fueling happens for a reason: if you look at a fuel table, Map Sensor values correspond with columns. When you increase or decrease the signal from the Map Sensor, you are simply making the ECU use a different column than it originally would have used. But wait, isn't the Map Sensor used for determining ignition requirements too? When you "lean" out a car with a Piggy Back, you also in all likelyhood advanced timing. When you "richen" a car with a Piggy Back, you also in all likelyhood retarded timing. Bottom line : Piggy Back cannot INDEPENDENTLY adjust fuel and ignition, any changes to fueling will produce a change in ignition too, and often this is undesirable. And also, tuning only piggy back without parts upgrade.. not give impressive result.my 2c....Maybe Mr. Zaki got more to chime in... heh heh</blockquote>

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