JPI 830 Settings?

[Marauder]

Just got my plane back from annual. I had a JPI 830 installed and a few questions came up while I was setting it up. > What is the FDR setting used for? I found it in the setup screens but found no mention of it in the manual and it seems to be a mystery on the Internet as well. > For those with Garmin GTNs, did you use the GPS-6 setting? It seems to show data based on GPS but my return flight was too quick to see if it is accurate. > If I understand the % HP calibration correctly, all I need to do is fly a 70% HP profile below 10k and adjust the unit to 70%, correct? > Why do you think they did not include a fuel pressure option? Thanks!

[Cruiser]

Can't help with FDR.

You can use GPS-C = 6 for fuel to next waypoint or GPS-C = 7 for fuel to destination...... your choice

If you are getting a MPG reading the GPS interface is working.

The EDM uses an formula for calculating HP%. Fly ROP at a known 70% setting and adjust the EDM to match.

 

Pictures...........

[Marauder]

Can't help with FDR.
You can use GPS-C = 6 for fuel to next waypoint or GPS-C = 7 for fuel to destination...... your choice
If you are getting a MPG reading the GPS interface is working.
The EDM uses an formula for calculating HP%. Fly ROP at a known 70% setting and adjust the EDM to match.

Pictures...........

I found out that FDR stands for "Flight Data Recorder". Apparently to connect it to some external black box and this sets the communication protocol.

I did see a MPG reading but do think "fuel to destination" would be more important and will switch it over. Thanks. Also saw an option to interface it with a CO Guardian system, both CO and O2 (level for the pilot ). When you say fly rich of peak, should I be leaned or just make sure the mixture is on the rich side?

Here is an updated picture of the right side of my panel. I had the breaker and right side avionics panels rebuilt, added the JPI 830, removed the fuel pressure/manifold gauge, installed an EI manifold gauge, moved my EI FP-5 over and had all of my switches for the AP consolidated (there is a placard being built to replace where the switches are now, what you see is temporary). I asked to have the panel painted to try to match the left side. Next year I will have it all removed and painted in a lighter color.

Before:




After:


 

[N601RX]

I connected mine to a KLN 94 and used the C2 setting,but yours would be different.  But if your getting MPG and fuel needed, its working. 

 

Also be sure they set the RPM of the tach feature to match your mechanical tach, if not they will not count the same.  It is important to do this before the JPI tach hits 10 hrs.  When it hits 10 hrs it becomes locked and you are no longer allowed to change it. If this happens you will have to remove it and send it back to the factory to be reset.

[fantom]

Do you guys know about how much more the JPI-900 would have been with installation?

[Marauder]

Do you guys know about how much more the JPI-900 would have been with installation?

I looked at the 900. The price difference was $2k just for the box (non turbo version, 4 cylinder). I don't believe there are more costs associated with the installation since most of the 830 probes/sensors would take about the same amount of time to install whether it is a 900 or 830. There may however be additonal paperwork/cost associated with the certification of it as the replacement for the primary instruments (like you may be required to remove the original stuff). I don't have the final installation hours yet, but when I see it, I will give you an idea what it took for the 830.

[fantom]

Thanks Marauder....what the heck is your real name?

 

IIRC, at S&F the price on the JPI-900 was about $5K.

[N601RX]

I paid $2,600 for the 830 at Oshkosh almost 2 years ago.

[fantom]

I paid $2,600 for the 830 at Oshkosh almost 2 years ago.

 

Sounds like that $2,000 delta is about right in today's dollars.

 

Mind saying what your install cost was?

 

Yes, I'm getting very close.

[Marauder]

I connected mine to a KLN 94 and used the C2 setting,but yours would be different.  But if your getting MPG and fuel needed, its working. 

 

Also be sure they set the RPM of the tach feature to match your mechanical tach, if not they will not count the same.  It is important to do this before the JPI tach hits 10 hrs.  When it hits 10 hrs it becomes locked and you are no longer allowed to change it. If this happens you will have to remove it and send it back to the factory to be reset.

 

Thanks for pointing out the 10 hour time limit. I did set it to 2500 because that is where I normally run in cruise (less vibration). I found this on the JPI site (it wasn't in the manual):

 

What is Tach Time and how do I set it up?

Introduction to Tach Time

Tach Time is calculated based on the average cruise RPM for your aircraft. Tach Time is accumulated once per second, using the following calculation:

Tach Time = Tach Time + (Current RPM / Average Cruise RPM).

Tach Time is true (counting at 1:1 with HOBBS), when your current RPM is at the Average Cruise RPM setting in the EDM.

When your RPM is less than Average Cruise RPM (when taxiing, decent, etc), Tach Time will count slower than HOBBS Time.

When your RPM is higher than Average Cruise RPM (during takeoff, climbing, etc), Tach Time will count faster than HOBBS Time.

Calibrating Tach Time

When shipped from the factory, your J.P. Instruments EDM will be set with Average Cruise RPM = 2400.

If your aircraft’s average cruise RPM is not 2400 RPM, follow these steps to set the Average Cruise RPM value.

With the engine off, enter Pilot Program Mode by holding STEP and LF for 2 seconds.

Tap NEXT repeatedly until END? is displayed.

Tap the FACTORY button, or hold STEP and LF for 2 seconds.

Tap NEXT until AVERAGE CRUISE RPM is displayed

Hold the left 2 buttons for 2 seconds to allow modification of the Average Cruise RPM.

Tap PLUS or MINUS to modify the RPM value.

When the value is properly set, hold the left 2 buttons for 2 seconds to save changes.

Tap NEXT until END? is displayed.

Tap YES to restart the EDM.

Important: Be sure to set AVERAGE CRUISE RPM in the first 10 hours of operation. After 10 hours of operation, the Average Cruise RPM setting will be locked down to prevent tampering with Tach Time values.

 

What will be interesting is how this compares with the EI tach time. With the last round of upgrades, I no longer have the mechanical tach. The MP gauges for both the EI and JPI match exactly. So, at least I know it is possible!

[Oscar Avalle]

I found out that FDR stands for "Flight Data Recorder". Apparently to connect it to some external black box and this sets the communication protocol.

I did see a MPG reading but do think "fuel to destination" would be more important and will switch it over. Thanks. Also saw an option to interface it with a CO Guardian system, both CO and O2 (level for the pilot ). When you say fly rich of peak, should I be leaned or just make sure the mixture is on the rich side?

Here is an updated picture of the right side of my panel. I had the breaker and right side avionics panels rebuilt, added the JPI 830, removed the fuel pressure/manifold gauge, installed an EI manifold gauge, moved my EI FP-5 over and had all of my switches for the AP consolidated (there is a placard being built to replace where the switches are now, what you see is temporary). I asked to have the panel painted to try to match the left side. Next year I will have it all removed and painted in a lighter color.

Before:

ImageUploadedByTapatalk1369230428.597489.jpg

ImageUploadedByTapatalk1369230461.931213.jpg

After:

ImageUploadedByTapatalk1369230093.962443.jpg

 

Congratulations, looks really nice...

[Marauder]

Thanks Oscar! Can't wait for these thunderstorms get out of the area so I can give everything a workout.

[PTK]

Very nice addition to your panel Marauder. Congratulations!

[danb35]

What will be interesting is how this compares with the EI tach time. With the last round of upgrades, I no longer have the mechanical tach. The MP gauges for both the EI and JPI match exactly. So, at least I know it is possible!

Based on what you posted from the JPI instructions, the EI and JPI will count tach time differently.  The EI R-1 counts tach time in real time any time the engine speed is over 1300 RPM.  So, an hour at 1400 RPM equals one hour of tach time, as does an hour at 2700 RPM, but an hour at 1200 RPM counts nothing.  With the JPI, an hour at 2500 RPM counts an hour of tach time (if you've set it to read true at 2500 RPM), an hour at 1250 counts a half hour, etc.

[Marauder]

Very nice addition to your panel Marauder. Congratulations!

Thanks. I loved my GEM from its simple interface to its reliability. That said, it is nice to have some of the other parameters all in one location.

[Marauder]

What will be interesting is how this compares with the EI tach time. With the last round of upgrades, I no longer have the mechanical tach. The MP gauges for both the EI and JPI match exactly. So, at least I know it is possible! Based on what you posted from the JPI instructions, the EI and JPI will count tach time differently. The EI R-1 counts tach time in real time any time the engine speed is over 1300 RPM. So, an hour at 1400 RPM equals one hour of tach time, as does an hour at 2700 RPM, but an hour at 1200 RPM counts nothing. With the JPI, an hour at 2500 RPM counts an hour of tach time (if you've set it to read true at 2500 RPM), an hour at 1250 counts a half hour, etc.

Dan -- I went back to the EI instructions and you're right. The JPI will read different than the EI in the long run since it is counting all of the idle time and "pro-rating" the time below the cruise number. Since the EI is the legal RPM/tach replacement, that is what the mechanic is using for tach time on the maintenance records. So it does beg the question to be asked, "what should be counted towards TBO?"

[M016576]

Dan -- I went back to the EI instructions and you're right. The JPI will read different than the EI in the long run since it is counting all of the idle time and "pro-rating" the time below the cruise number. Since the EI is the legal RPM/tach replacement, that is what the mechanic is using for tach time on the maintenance records. So it does beg the question to be asked, "what should be counted towards TBO?"

I think the answer is "it doesn't matter... We're part 91!" :-)

[Marauder]

Dan -- I went back to the EI instructions and you're right. The JPI will read different than the EI in the long run since it is counting all of the idle time and "pro-rating" the time below the cruise number. Since the EI is the legal RPM/tach replacement, that is what the mechanic is using for tach time on the maintenance records. So it does beg the question to be asked, "what should be counted towards TBO?" I think the answer is "it doesn't matter... We're part 91!" :-)

Ah, but we are driven by numbers... I will keep track of the differences and see what they how they tally out.

[rainman]

N601RX, I just got off the phone with JPI. they reported that the only RPM setting you can set is for 4 or 6 cylinder. If that is correct, then there is no other RPM adjustment possible on th 830 before or after 10 hours. As my JPI and the original gauge vary by about 100 RPM, the tech support suggested strobing the prop to see which reading is the more accurate. Is that consistent with what you know? My plane is currently in for a panel upgrade, so I'll get this figured out next month. Ray

[N601RX]

You can set the rpm you want it to use for caculating 1 hr of flight time. It does not adjust the actual rpm displayed, it just affect the hrs logged on the counter. The procedure Marauder listed above is direct from JPI's web site. It becomes locked out after the 1st 10 hrs.

I'm guessing the JPI will be correct. It uses a hall effect sensor to count the time between the north and south poles on the magnets inside the mag.

[Marauder]

You can set the rpm you want it to use for caculating 1 hr of flight time. It does not adjust the actual rpm displayed, it just affect the hrs logged on the counter. The procedure Marauder listed above is direct from JPI's web site. It becomes locked out after the 1st 10 hrs.

I'm guessing the JPI will be correct. It uses a hall effect sensor to count the time between the north and south poles on the magnets inside the mag.

 

Just as a side note, I flew this past weekend a bit and both the EI and JPI digital readouts were spot on with each other both for RPM and MP.

[Marauder]

What will be interesting is how this compares with the EI tach time. With the last round of upgrades, I no longer have the mechanical tach. The MP gauges for both the EI and JPI match exactly. So, at least I know it is possible! Based on what you posted from the JPI instructions, the EI and JPI will count tach time differently. The EI R-1 counts tach time in real time any time the engine speed is over 1300 RPM. So, an hour at 1400 RPM equals one hour of tach time, as does an hour at 2700 RPM, but an hour at 1200 RPM counts nothing. With the JPI, an hour at 2500 RPM counts an hour of tach time (if you've set it to read true at 2500 RPM), an hour at 1250 counts a half hour, etc.

Dan -- I may have gotten lucky but my EI and JPI still agree exactly after 5 hours on both. I will keep watching them.