The ME ECUs offer the possibility of setting the crankshaft angle at which the injection event should start. The table used to configure this is Injection>Fuel Injection Angle. There are a few opinions on this, but most tuners aim to spray the fuel while the intake valve is open. At higher loads and RPM, where injector duty rises to more than 25% (180* crankshaft, length of the intake stroke), spraying fuel onto the closed intake valves will help atomization and cool them at the same time. 


As with all tuning information, please use your best judgement when configuring this parameter.


As opposed to ignition angles, the injection angle is set in true crankshaft degrees (not advance), so a higher value will make the injection event start later. You'll notice that, when running fully sequential injection and big injectors, choosing the injection angle correctly can make the difference between a smooth and a rough idle and low-load operation. For reference, here's the timing of the four strokes in relationship to the start of injection angle:


0* - start of power stroke

180* - exhaust stroke

360 * - intake stroke

540* - compression stroke