Shown as percent difference in flow, we see that even though the injectors are matched perfectly in the linear operating range, the difference in slope in the non linear range results in a flow mismatch that is magnified as the pulse-width decreases, becoming substantial at the very lowest pulse widths. In this case, the flow rate, or slope of each injector in the non linear range is 1530cc/min and 1470cc/min representing a spread of +/- 2%.Īs the graph clearly shows, the difference between the two injectors increases as pulse width decreases. Both injectors have the same flow rate and offset, but in the non linear range, the flow deviates from the straight line shown in the graph above. Moving on to the non linear operating range, the graph below shows a pair of 1500cc injectors matched using the Injector Dynamics Slope Intercept method. Slope Intercept matching as introduced by Injector Dynamics in 2007 solved this problem by matching injectors based on flow rate (Slope) and offset (Intercept) providing even cylinder to cylinder fueling across the linear operating range. At a pulse width of 19msec, which equals 90% duty cycle at 6,000 rpm, 2.5ul amounts to a mere 0.6% difference in flow between the two injectors, but at 2msec, that same 2.5ul difference amounts to a 9.5% difference! The slope of both lines is the same, as they have the same flow rate, but the difference in offset results in the injector with the higher offset delivering 2.5 uL less fuel per injection event. One with an offset (Dead time, latency, etc.) of 0.95 milliseconds, and one with an offset of 0.85 milliseconds. The graph below shows the dynamic response of two hypothetical 1500 cc/min injectors within their linear operating range. Let’s first consider static flow matching which was the industry standard prior to Injector Dynamics. Dual Slope Matching was conceived by Aaron Looft of Injector Dynamics, who was inspired by the dual slope injector characterization model used by Ford. The concept of Dual Slope Matching extends the injector matching into the lower non linear operating range. 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. 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. Traditionally, injectors were matched based on static flow rate alone, which resulted in large deviations at low pulse widths. *If the plug and play adapters or plug and pin kit is purchased the pigtails will not be included.Dual Slope Matching is a method of matching injectors that provides the best possible cylinder to cylinder fueling across the entire operating range. The plug and play adapters or harness will convert from the type of plugs on these injectors to the plugs on your harness without any cutting or soldering required. This can be done by purchasing the optional the pigtail set for soldering, the plug and pin set for crimping or you can choose to purchase the optional plug and play adapters or harness to work with your oem injector wiring harness. You maybe be required to change the injector plug on the wiring harness in your car. We flow match all our injectors via our specialised flow benches that utilise state of the art precision flow meters and match them by slope flow and offset values (also known as dead time, lag, latency), which ensures that the injectors are perfectly matched to achieve precise balance between cylinders.Ĭonnectors for the above application are below in Recommended Products PRICE IS FOR A SET 4X DIRECT FIT FUEL INJECTORS - *INCLUDES A SET OF FREE PIGTAILS*Ġ8-15 Mitsubishi EVO X (4B11T 2.0L turbo engine)įlow matched via SLOPE FLOW AND OFFSET VALUES to within +/- 1%
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