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Part 1 Basic Speed Density tuning and LOAD calculation In this guide we will explain the basics of Speed Density (SD) tuning and then go further into detail. The basic level (Slope tuning) is probably enough for most tuners to get their vehicles set up to a high specification. In general if you have not really modified the vehicle heavily your speed density tables should be well set up by Ford and you may only be seeing areas outside the normal because of injector scaling being out. You should start with your injectors dialed in to a high level and they should be dialed in on a stock