Floscan K Factor Adjustment

[mike newall]

We have an IO-360 180hp motor in an RV7.

Calibrated the Floscan for its generic value on the Dynon.

Just done a fill to fill test and we need to increase the flow indication on the Dynon.

Ran for 3 hours today at 5,000' leaned to 25 liters per hour at 22/22.

It later showed we were actually burning 30 liters per hour.

Does anyone know how much to increase the K factor to achieve an appropriate increase in the indication to represent what we are actually burning ?

Thanks

Mike

[alpinelakespilot2000]

If you look in your Dynon installation manual it will show you the mathematical formula you need to use to calibrate it after running a tank or two of gas through it. Hope this helps.

[NDrv8r]

I would advise keeping a log of fuel use and the corresonding fuel remaining from dynon and tweak it over a period of time rather than just one time as just having one wing a bit lower than the other can affect how much fuel you can get in before it gets to the bottom of the filler ports.

[humptybump]

I "calibrated" my system over several flights. The process is simple.

New K = Old K * (fuel reported / fuel used)

Since the K factor represents the number of pulses for a unit of fuel to flow through the transducer, a higher value will reduce the reported fuel flow and a lower value will raise the reported fuel flow.

In you example, Dynon under reported so the above equation will lower the K factor and increase the reported fuel flow.

It's recommended to average several trips.

Make a note of four consecutive fills and the corresponding Dynon fuel used reports. Average the four fill numbers and average the four reported numbers. Then use these to make the K-factor adjustment as described above.

[dynonsupport]

We agree with Glen. I'd put at least 100 gallons in to calculate the adjustment. However, if you are that far off, you can do a rough adjustment to get close based on the formula in the manual and then do your finer adjustment on the flow after that.

[mike newall]

Thanks guys.

Normally only part fill tanks so we can aerobat, however we can do comparative tests over a few weeks.

Cheers