I replaced the standard .285 needle jet with a .290. The # 5 cylinders EGT runs about 100 degrees leaner than jabiru recommends. The induction system on the jabiru is not the best in the world and it is normal to have a wide variance in the EGT's but mine are all pretty close except for the #5. I made a 1 hour test flight. The autopilot did most of the flying. I flew for several minutes at 2800,2700,2600 and 2500 RPM and gathered engine data. Mainly fuel flow, EGT and CHT. I then made several heading and altitude changes on the autopilot. I am very happy with the autopilot, The winds were gusting to 25 and it was very bumpy at low altitudes and the autopilot had no problem holding headings and altitude. It would climb and decend to to the commanded altitude at the commanded rate and make very nice level offs. Turned the autopilot off and played a little then came in for a landing. Had a 10 knot crosswind gusting to 18 and the airplane handled it with no problem. Very stable in all axis. I downloaded the data off of the Dynon and spent a couple of hours compairing my previous flights and the recommendations from jabiru and decided that my fuel flows are a little low at any given cruise RPM and that my EGT is still about 14 degrees high on my #5 cylinder. My transition fuel flow is occuring at 100 RPM higher than what I'm looking for. I'm guessing that adding 1 to 1.25 degree of pitch to the prop should get me pretty close. The extra load on the prop should increase the fuel flow, richen the mixture and lower the transition RPM so that will be my next step.
