Next we test each injector at varying pulse widths, over the entire rpm range, from idle to 12,000 RPM. Starting the test at minimum Duty Cycle and increasing to 80% Duty Cycle, including the fast idle test at 2400 RPM. (80% is considered maximum usable Duty Cycle and is commonly used to calculate Brake Specific Fuel Consumption). We use the strobe light and the laser beam through out the testing cycle. It's a wonderful way to visually freeze the patterns, in mid air, and actually measure the results with the laser. No one else has this capability, and it's a real interesting light show. The last test that we run is the Tell All Test. We run each unit up in duty cycle, at 12,000 RPM, until it fails electronically. (Seen on the oscilloscope) This is prominently displayed with the laser and strobe. Most pintle type injectors fail at 86%/88% and the Disc will usually go to 92% +, depending on system pressure. All must cycle smoothly up to 85% to Pass. Bad injectors will sometimes go "static" at 70% or so and are discarded. NOTE: Most pintle injectors will increase flow rates up to 88%, 92% with Disc injectors, and then go "semi-static", half open-half closed, just before going full static. This time-out event occurs at different time/pulse width durations, in different injectors, but always produces a 50% or so Duty Cycle flow rate. This extremely dangerous situation will usually occur at the worst of times, full throttle-max boost-high RPM- just when you need 100% fuel delivery you get 50% and go dead lean. BANG!!! This problem seems to amplify a bit at higher pressures.