Since December of 2014 I've been wrestling with a UL Power problem that I refer to as "Ignorance by fear". UL Power has decided in their "superior automotive mindset" that pilots can't be trusted. That's right, that us lowly pilots have no idea how to run an engine and that having control of an engine's air/fuel mixture would cause a worldwide disaster that would usher in WWIII. Well, because of this impending doom, UL Power has tuned their ECU's to run VERY rich in order to protect themselves against an onslaught of UL Power engine failures at the hands of uneducated aircraft owners. The fear of litigation was keeping them up late at night, so it was black sooty exhaust pipes and fouled spark plugs for all...until now. In following the great spirit of Burt Rutan, I'm going to take a leap of simple faith and modify my engine to give me control over my ECU. The modification is far from rocket science and has been around longer than I have been alive. The trick is simple. Wire in a Potentiometer in Parrallel to the air temp sensor and adjust the resistance via a "knob" in order to trick the ECU into leaning the mixture at will. The ONLY risk this mod presents is running a mixture that raises the CHT's above their limits. This of course is no issue, as I have a CHT probe on each cylinder and will easily be able to monitor each CHT at all times. Leaning the mixture will address a few key problems and offer several solutions, but before I dive into all that, I want to test the mod and ensure its success. Read all about the results here: http://www.myulpower.com/p/blog-page_29.html
