I installed the refurbished injectors and tested them using the TunerStudio diagnostics. I tested fuel pump operation in TunerStudio and checked the fuel system for leaks. According to the pressure gauge, the static fuel pressure is 60lbs which is higher than expected but explains how the undersized injectors are able to produce 300hp. I don’t have the idle air valve installed so I shimmed open the throttle slightly to set a fast idle. With nothing left to check I tried starting the engine. The engine started almost immediately and ran smoothly at about 2000 rpm. I don’t have any water … Continue reading Update 6/29/16 – It Runs!

I installed the VDO combination oil pressure sensor and low pressure switch. I originally ordered an M10x1 thread pitch sensor but the VDO sensor has an M10 tapered thread where the port in the Audi engine has straight threads for use with a crush water. For example I could use an M10 banjo bolt and line if I need a pressurized oil source off the engine. Instead I ordered an adapter from an M10 straight thread to 1/8 NPT and then ordered a VDO sensor in 1/8 NPT. The resistance range of the sensor is appropriate for my VDO oil … Continue reading Update 6/16/16

The fuel injection wiring is done except the O2 sensors and the IAC valve. There are lots of clicks and whirs when I turn the ignition key to ‘run’ as relays and solenoids move to their startup positions. The fuel pump switches on for 5 seconds to pressurize the fuel system and then is turned off by the ECU until the engine is cranking. In the ‘start’ position the engine cranks normally. The tach and speedometer gauges were acting a little weird when I first tried them a few weeks ago but they are working properly now that I am … Continue reading Update 6/13/16