Mooney M20J - K Factor on Garmin G3X touch or G500 TXi

[Shawn26]

Hello guys,
 
Looking for a K factor value on a M20J with this particular setup. If you would kindly share your inputs I greatly appreciate it. Thank you
 
 
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[ArtVandelay]

Should be marked on the fuel flow sender.

[KSMooniac]

And the marking on the sender is just the starting value. You'll need to adjust it over using the formula in the manual and your actual fuel consumption, so you can't just use someone else's value.

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[spistora]

JPI lists starting points here:

https://www.jpinstruments.com/FAQ/tranducer-k-factors/

But it can vary greatly and should be marked in the sender.

[carusoam]

And when you have all that….

See the notes on proper installation techniques for FF sensors…. 
 

This is an area where some things have gotten left out… over the years.

PP thoughts only, not a mechanic…

Best regards,

-a-

[mhrivnak]

If you're lucky, you might find the K factor in a log entry from when the transducer was installed, which could be more convenient than removing fire sleeve and whatever else to get a look at it.

[PT20J]

If you fave a Floscan transducer (common) start with 29.0. Then adjust up or down (usually up) in order to match actual fuel burn.

Skip

[A64Pilot]

Due to the possible differences in plumbing etc., you can’t use a set number, yes I know Shadin did somehow.

I did the Certification test flights of a whole bunch of aircraft equipped with MVP-50T’s and even though the installations were identical, the K factor was different every time.

‘What I did was set the K factor to a fuel flow that was close to correct at TO power, then let the owner fine tune it if they so desired. Setting it so TO power fuel flow as correct got it pretty close.

 

[Shawn26]

When you upgrade to Garmin G3X touch or G500 TXI with engine data, Garmin has its own transducer which you have to replace. From factory it has a K factor of 76000.

I was trying to see if anybody where able to play around with the K factor for this particular setup to get a true Fuel Flow reading on a M20J.


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[PT20J]

53 minutes ago, Shawn26 said:

When you upgrade to Garmin G3X touch or G500 TXI with engine data, Garmin has its own transducer which you have to replace. From factory it has a K factor of 76000.

I was trying to see if anybody where able to play around with the K factor for this particular setup to get a true Fuel Flow reading on a M20J.


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Not sure about a G500, but the G3X runs all the engine transducers through a GEA 24. A number of transducers are supported. For fuel flow, the Garmin part number is an Electronics International Red Cube FT-60.  But, you can also use a Floscan 206B. I am using my existing Floscan for which I have determined a 3050 K-factor in my G3X upgrade in my M20J.

EI claims that there transducers don’t need K-factor adjustments, but I’ve read a lot of complaints about high failure rate, so I stuck with the Floscan.

Skip

[Shawn26]

Not sure about a G500, but the G3X runs all the engine transducers through a GEA 24. A number of transducers are supported. For fuel flow, the Garmin part number is an Electronics International Red Cube FT-60.  But, you can also use a Floscan 206B. I am using my existing Floscan for which I have determined a 3050 K-factor in my G3X upgrade in my M20J.
EI claims that there transducers don’t need K-factor adjustments, but I’ve read a lot of complaints about high failure rate, so I stuck with the Floscan.
Skip

I actually did a G3X touch, and the shop changed the original transducer to Electronic International. According to them, you don’t need that much of adjustment on the K factor but it’s had to believe. I think mine is off by 5-7%

I assume you’ve installed GFC 500 and GTN navigator. How do you like your setup ?


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[PT20J]

1 hour ago, Shawn26 said:

When you upgrade to Garmin G3X touch or G500 TXI with engine data, Garmin has its own transducer which you have to replace. From factory it has a K factor of 76000.

I was trying to see if anybody where able to play around with the K factor for this particular setup to get a true Fuel Flow reading on a M20J.


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I don’t know yet. It just went into the shop Thursday. 

What I found with the Floscan is that it read about 5% high when set to the K-factor stamped on the transducer. 

Skip
 

[carusoam]

K-factor is often affected by the plumbing into and out of the sensor…

Expect all flow sensors to have a good starting number… That can be tuned over a few tank refills….

Copy a good plumbing install for ease of getting the K-factor right…

Random plumbing installs can have a K-factor that changes based on the flow rate being used…

We have seen flow transducers mounted near exhaust pipes…  and some with 90° elbows before or after the sensor….

Some give good numbers and others give numbers that look good…

PP thoughts only, not a mechanic…

Best regards,

-a-