Matt,

 

Thanks for the data.

 

1. What was the MAP and Baro readings taken before engine start? 

 

2.  How do you explain the magic of TAS in trial 3?

 

Interestingly enough, 4 people have used this to recognize problems with the "snubber valve" on the engine side of the firewall for VM systems.  Trial 1 and 2 are consistent with respect to all variables, change in MAP, fuel flow and airspeed.  A good way to test this particular instrumentation is, at a reasonable cruise altitude and WOT, reduce the MAP by 1" and record the change in fuel flow and speed - after returning to WOT, reduce the RPM by 100 and record the change in fuel flow and airspeed.  These numbers should be within 5-10% of each other.  If not, something is wrong.