DonMuncy Posted December 24, 2019 Report Share Posted December 24, 2019 I was (still am) having trouble getting my JPI 700 to download flight data. I talked to the JPI folks and they suggested "resetting" the instrument back to its original settings, and if that didn't fix it, it would need to go back to them for repair. Their directions for the reset were insufficient for my competency level, and in my blundering around, I managed to screw up the JPI K factor, without knowing where it started. Does anyone know what the starting K factor should be. I realize it needs to be fine tuned to be highly accurate, but I need a place to start. I'm pretty sure the cruise fuel flow setting of 60 gph is not quite right. Quote Link to comment Share on other sites More sharing options...
Marauder Posted December 24, 2019 Report Share Posted December 24, 2019 I was (still am) having trouble getting my JPI 700 to download flight data. I talked to the JPI folks and they suggested "resetting" the instrument back to its original settings, and if that didn't fix it, it would need to go back to them for repair. Their directions for the reset were insufficient for my competency level, and in my blundering around, I managed to screw up the JPI K factor, without knowing where it started. Does anyone know what the starting K factor should be. I realize it needs to be fine tuned to be highly accurate, but I need a place to start. I'm pretty sure the cruise fuel flow setting of 60 gph is not quite right. Don - the k factor value should be written on the fuel transducer. It will look something like this (red box). Look for something that has fuel lines going in and out of it:If there is no number on it, just put a value in like 29.00 and then do at least 3 flights burning at least 10 gallons. Use the formula in the manual to calculate the new k factor.I have made a sport of perfecting my k factor. The line guys hate it when I saw I will need 19.2 gallons and they put 19.1 in. Sent from my iPad using Tapatalk Pro 1 1 Quote Link to comment Share on other sites More sharing options...
hypertech Posted December 24, 2019 Report Share Posted December 24, 2019 (edited) If you bought it and have the serial number for your monitor, you could also call JPI. They were able to look mine up when I was trying to figure out if the avionics shop had configured it or not. It is correct that it is also supposed to be on the transducer - if you can get to the tag in a readable orientation. Edited December 24, 2019 by hypertech 1 Quote Link to comment Share on other sites More sharing options...
jetdriven Posted December 24, 2019 Report Share Posted December 24, 2019 Your aircraft should have two K—factors. One for the fuel flow into the servo, and one for the return line back to the tank. The number is engraved on the two fuel flow transducers. 1 Quote Link to comment Share on other sites More sharing options...
flyboy0681 Posted December 24, 2019 Report Share Posted December 24, 2019 If you have a Red Cube FT-60, the same as maurauder posted, the K-factor is 68,000. When I had the FT-60 installed years ago I programmed the JPI-700 with that value and never touched it again. To this day the fuel used display is accurate to within a few ounces. 1 Quote Link to comment Share on other sites More sharing options...
Aerodon Posted December 25, 2019 Report Share Posted December 25, 2019 Don, just start with 30.00 for an injected unit and it will be close. Then follow the K-factor calibration procedure in the book and after a couple of flights you will be sorted. Unlikely you have a return flow transducer in an M20K. Aerodon 1 Quote Link to comment Share on other sites More sharing options...
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