Kit Aircraft Modifications

Hi Everyone,

I received a message from my engine ECM guru Bob at OBD Diagnostics today indicating that he has recently done some work a Velocity with an LS1 in it. It has the same Delphi MEFI-4b ECM in it as is used in my RV-10.

Bob said that he had a look at the tune that was supplied with the unit as purchased from Painless Performance. His assessment was not very good. He felt that the engine was being run too lean and he has since come up with a baseline tune that is better for the engine in the aviation environment.

The whole issue of what ECM is best to run these alternative engines in aircraft has been a controversial discussion topic for years. I have met those who swear by the factory ECM and those who wouldn’t touch one with a ten foot pole. I happen to be in the latter camp and I have one of the Delphi MEFI-4b units in my aircraft.

I chose this unit mostly because of its reputation for robustness. The thing was designed for the marine environment and is pretty bullet proof. It is also small. About one third the size of an OEM unit. I also like the fact that there are tools available to be able to tune the program. Lastly, I like the fact that it is an engine only computer. It is not designed to operate a transmission as well. This reduces programming complexity and any reduction in complexity is welcome when installing a conversion engine in an airplane.

A move is afoot by people flying this LS1 setup to evaluate the new tune. They are taking an instrumented approach and this will lead to a better knowledge of the programming and its interaction with the aviation environment and power requirements.

I have recently received my Certificate of Airworthiness and in the short time before we fly I am assuming that I will be learning how to install a new program in this computer.

Build Smart and Fly Safe!

Dave