What the EC 2 DOES do is have a two separate maps, the regular one,

and a map that is set for High RPM low MP (essentially for power off

fine pitch descents where you are using the engine as a brake). The

changeover point for that map is user defineable. So you can customize

it to your setup. I guess paul would have felt better with more maps

with more changeover points or something.

 

Just a slight correction.  There are two Mixture correction tables, and the cross over from Lo table to High table is set at about 3000 rpm and is not user defined (at least not on mine).  The injector stage point can be set by the user (default is about 17” MAP, but varies depending on whether MAP is going up or going down).

 

The 3000 rpm cross-over on mine is generally between about 13” and 14” MAP.  Low power, idle/taxi operation is generally on the Lo table.  Flight regime is normally on the High table.  The higher MAP portion of the Lo table doesn’t get used, at least not for fixed pitch prop.  

 

The corrections for the low MAP end of the High table may be different than the low end of Lo table, because in a descent the MAP is likely to be low, and the rpm above 3000.  The low end of the High table can only be set in flight (or perhaps without a prop) for obvious reasons.  I haven’t found much difference in the two, but I think the low end of the High table is a bit leaner.

 

Beyond that, I agree – I have no idea what Paul had in mind.  The MAP value at which the cross-over occurs will vary depending on prop pitch, so maybe that was his concern.  The tuning may be a bit different for a CS prop (like you will have to tune the Lo table to a higher MAP point), but so what.  Once it is set, it’s set. But I’ll agree, it is a bit complicated, so if you have never used the EC2, you could get confused.

 

Perhaps someone who is using the EC2 with CS prop can tell us whether they have found the tuning more difficult.

 

Al