Fuel Injectors 2600XDS

Dual Slope Matching

Dual Slope Matching is a method of matching injectors that provides the best possible cylinder to cylinder fueling across the entire operating range.

Traditionally, injectors were matched based on static flow rate alone, which resulted in large deviations at low pulse widths.

Injector Dynamics introduced Slope-Intercept Matching over a decade ago, which provided even cylinder to cylinder fueling across the linear operating range of the injector.

With the progression of turbo technology, and increased use of alcohol fuels, greater demands are placed on fuel injectors, and they are often required to deliver fuel well outside of their linear operating range.

The concept of Dual Slope Matching extends the injector matching into the lower nonlinear operating range. Dual Slope Matching was conceived by Aaron Looft of Injector Dynamics, who was inspired by the dual-slope injector characterization model used by Ford.

How Well This Works in Practice

Moving from hypothetical injectors to a real-world application, the response in the nonlinear range is considerably less orderly than shown in the graphs above and is quantified using a technique called Least Squares Linear Regression – Which is a fancy way of saying straight-line approximation.

By approximating the response in the nonlinear range, and matching sets accordingly, the best possible cylinder to cylinder fueling is realized across the entire operating range.

Using the ID2600-XDS as an example, the traditional Slope-Intercept method of matching results in an average deviation of +/-5.1% in the nonlinear range, while the new method of Dual Slope Matching has reduced this to +/-1.4%

In a perfect world, this deviation would not exist at all, but for those of us who live (And tune!) in the real world, Dual Slope Matching represents a large step forward, and we are proud to offer it to the market.

• You may need EV1 to EV6 Injector Adapters or EV14 to EV6 Injector Adapters which allow you to use these injectors with your EV1 (stock) harness without cutting or altering your existing harness.