JPI 830 ?

[ArtVandelay]

The display is not showing CHT for cylinder 1 only when stepping, the value is shown on the graphic part

Anybody ever seen this?

[carusoam]

Looks like a piece of the program isn't working...

A quick call to JPI will be interesting. I don't know how they can update the software without sending it in...

Could it be a setting?

Let us know what you find out...

Best regards,

-a-

[aaronk25]

When I left Winnipeg yesterday it was -25C and my cockpit heater cake unplugged. My 830 for the first time ever did the same thing! So I would guess it's something with the cold or it doesn't like the day before thanks giving.....

[ArtVandelay]

When I left Winnipeg yesterday it was -25C and my cockpit heater cake unplugged. My 830 for the first time ever did the same thing! So I would guess it's something with the cold or it doesn't like the day before thanks giving.....

Interesting, because it's the coldest day we've had since I got it, but this is south Florida (50F).  Was is Cyl #1 for you too?

[aaronk25]

I can't remember. I didn't touch anything after start and that is when I noticed it. Not sure if it was displaying #1 or if scrolled though to a different one.

Never happens before in 700 hours

[N601RX]

When I had my jpi 830 the released regular updates on their website that were easily installed with a thumbdrive. Do you have the most recent version, or on the other hand perhaps you just upgraded to the newest version?

[ArtVandelay]

When I had my jpi 830 the released regular updates on their website that were easily installed with a thumbdrive. Do you have the most recent version, or on the other hand perhaps you just upgraded to the newest version?

I went to their website, found out my version is newer than the one you can download. I flew again today and problem was gone?! I guess I'll wait for another "cold" morning to see if problem returns.

[N601RX]

Their tech support usually gets back to you within a few hrs, keeping in mind they are in California. Send them the pictures and the data logger file and see what they say. I've also noticed that the bottom numbers do not update once they are displayed, whatever number they come up on they keep until they step to the next number. The numbers elsewhere on the display will continue to change while the same bottom number is displayed.

My only complaint with JPI is they don't publish what changes are made to different revs of their software. Sometimes it's obvious changes to the display or menu, but other times there is nothing visual, which leads me to believe they have probably quietly fixed a bug or two.

[M016576]

Their tech support usually gets back to you within a few hrs, keeping in mind they are in California. Send them the pictures and the data logger file and see what they say. I've also noticed that the bottom numbers do not update once they are displayed, whatever number they come up on they keep until they step to the next number. The numbers elsewhere on the display will continue to change while the same bottom number is displayed.

My only complaint with JPI is they don't publish what changes are made to different revs of their software. Sometimes it's obvious changes to the display or menu, but other times there is nothing visual, which leads me to believe they have probably quietly fixed a bug or two.

When I had my 830, after about 40 hrs of flight, the thing would crash. I updated the software and magically everything started working great (no crashes). They certainly fixed that bug (probably some sort of memory overflow or null pointer problem)

Other improvements included adding Hobbs time, and labeling the two buttons on the screen (w/ LF and Step). I really appreciated the fact that JPI made those updates available for free- I thought "finally, an aviation company that gets it." I was wrong... After they stopped providing those updates on their webpage and wanted to charge for the GPS breadcrumb update, I took my business elsewhere (EI CGP-30R on the new to me missile). At least the EI unit hasn't had any bugs that needed an update.

[aviatoreb]

What is the difference between the 730 and the 830?  I have the 700 and I am getting close to pulling the trigger on upgrade.

[Aerodon]

What is the difference between the 730 and the 830?  I have the 700 and I am getting close to pulling the trigger on upgrade.

 

Nothing, except for the extra transducers and harnesses,  OAT, RPM, FF, Oil T, MP.  With the current rebate program, the 830 is not much more than a 730.  

 

Send me an email to supercub180@gmail.com and I'll give you some trade in options on your 700.

 

Don

[flyboy0681]

Hopefully the remaining fuel was not accurate either!

[ArtVandelay]

Hopefully the remaining fuel was not accurate either!

My bad, I forgot to reset fuel level after filling up.

[kshaw]

The JPI 730 and 830 have use the same head and same firmware.  The only difference is the bundling of sensors included with each, so define what you need and compare prices between the 830 bundle and the 730 plus the sensors you actually need.

[aviatoreb]

Nothing, except for the extra transducers and harnesses,  OAT, RPM, FF, Oil T, MP.  With the current rebate program, the 830 is not much more than a 730.  

 

Send me an email to supercub180@gmail.com and I'll give you some trade in options on your 700.

 

Don

 

I want to give a thumbs up to Don - he gave me an astonishingly good price on an EDM 830 following this thread when I contacted him and he has been a pleasure to work with!  I can't wait to get the unit into my airplane right at the beginning of Jan.  Thanks Don!

 

Erik

[Piloto]

Interesting that your JPI 830 is set to 42" MAP as red line for an M20J. Do you have turbo on yours?

 

José

[ArtVandelay]

Interesting that your JPI 830 is set to 42" MAP as red line for an M20J. Do you have turbo on yours?

José

No I do not, don't know where they got that.

[Marauder]

Interesting that your JPI 830 is set to 42" MAP as red line for an M20J. Do you have turbo on yours?

José

No I do not, don't know where they got that.

The out of the box JPI 830 comes with the MP set for 42". Since the 830 is not primary, it can be set for any top end limit you want. When I installed mine, I set the values at the POH values or what the markings were on the factory original gauges.

[aviatoreb]

Ok- there she is - joined the 830 club!  I hadn't even realized it couples to my gps for all kinds of useful range information.

 

Thank you again to Don!  It has been wonderful working with you and everything came to my local avionics shop and in a timely manner.  And an amazing price.

 

My only wonder is what to make of the %HP indication.  My airplane POH says 100% is 38'' and 2650 on a standard day.  But the take off you see was yesterday on an arctic cold day out of Burlington, VT where the work was done - density altitude was -4500.  But you see I am at 2500 ft and climbing.  So I pulled back until it said ~100% - that's 98% - and it came out to 32'' at 2650.  If anything I would have guessed 38-4.5=33.5'' would show 100% if the built in computation is at I would understand it.  What am I missing?  Should I be trying to nail this number by tuning the setting?  Should I worry if on cold days if sometimes I would see 110% and more?

 

You can also see that despite climbing briskly with cowl flaps closed, the CHTs are very cool.

[carusoam]

That fits pretty nicely in that spot!

I don't think that JPI has the data that Rocket used to develop their charts...

Making the ROP data a little fuzzy. More fuzzy than the LOP data...

LOP, they can use a calculation directly on FF...

ROP, they would need an airflow sensor... Plane designs have too much variation and are unable to use MP gauges to estimate AF in the real world.

Ask JPI... It would be a vast improvement if that data were real. They would need a chart of AF vs MP for the Rocket... And one for the O would be nice!

Best regards,

-a-

[ArtVandelay]

Check the pilots guide for the configuration, there is parameters that are used for the HP calculation, Rated HP, EC...also check that the temp & FF probes values are correct.

[aviatoreb]

That fits pretty nicely in that spot!

I don't think that JPI has the data that Rocket used to develop their charts...

Making the ROP data a little fuzzy. More fuzzy than the LOP data...

LOP, they can use a calculation directly on FF...

ROP, they would need an airflow sensor... Plane designs have too much variation and are unable to use MP gauges to estimate AF in the real world.

Ask JPI... It would be a vast improvement if that data were real. They would need a chart of AF vs MP for the Rocket... And one for the O would be nice!

Best regards,

-a-

 

Thanks!  I am very pleased with the outcome.

 

I am hoping some rocket owner here has already done the dirty work and can tell me what are the perfect settings for rocket-powered engines.

 

Yes, I know by hand the formula for LOP.  Does the 830 use that proportionality concept for LOP power to gph for 7.5:1 engines?  THat's what I would hope.  ANd for ROP, I would guess they use some kind of polynomial fitting between POH stated engine settings at standard day and then common corrections for nonstandard temps?  I dunno what they do but that is what I would hope if I were on the design team.

 

Check the pilots guide for the configuration, there is parameters that are used for the HP calculation, Rated HP, EC...also check that the temp & FF probes values are correct.

 

I didn't find that yet in the operating book.  Looking....  Anyway I don't see advice on what settings correspong to which engines.

 

Hopefully a rocket owner here already setup an 830 and can just tell me.  Anyone, Anyone? Beuller?  Bueller....