English French German Italian Portuguese Spanish Swedish

 

Eco mode throttle position

  • youngwerth
  • youngwerth's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 4 days ago #19491 by youngwerth
Eco mode throttle position was created by youngwerth
I read in the manual that the engine should stay lean until about 95% throttle. Me egt drops and my fuel consumption goes way up at about 70% throttle. Is this normal, is there an adjustment for this?

My fuel flows tend to be 10-20% higher than book values at a given rpm and manifold pressure.

Thanks.

Please Log in or Create an account to join the conversation.

More
3 months 4 days ago #19493 by Roger Lee
Replied by Roger Lee on topic Eco mode throttle position
Usually if you stay down around 5200 or lower you're good. Run at 5300 plus and you'll consume that extra fuel. No adjustment. For the most part everything is computer controlled.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

Please Log in or Create an account to join the conversation.

  • Bill Hertzel
  • Bill Hertzel's Avatar
  • Away
  • Platinum Boarder
  • Platinum Boarder
More
3 months 4 days ago #19495 by Bill Hertzel
Replied by Bill Hertzel on topic Eco mode throttle position
The engine selects ECO mode based on Manifold Pressure (MAP) and RPM. Power!
You should be able to maintain ECO Mode up to 900mBar(26") below 5500 rpm.
If you are seeing, for example, 27" or more at 5200rpm, you are Over Propped and lugging the engine.
The engine goes into Power Mode to save itself.

At Wide Open Throttle (WOT), can you make 5500 rpm in a climb, and 5800 in level flight?
Reducing the prop pitch will increase the RPMs and lower the MAP.

The engine will last much longer if you do not over stress it.
It will reward you with lower fuel consumption.

Please Log in or Create an account to join the conversation.

More
3 months 3 days ago - 3 months 3 days ago #19497 by Roger Lee
Replied by Roger Lee on topic Eco mode throttle position
Hi Bill,
The guys in the US use ground adjustable props and probably none of them see 5800 rpm and especially at take off. Most only see 5500 to 5650 at WOT in level flight and of course less in climb. Usually around 5000 - 5100 in climb. I have 6-7 912iS owners I see and because of their ground adjustable prop settings 5300 is their magical number.
I agree it would be nice to be able to use a variable pitch or constant speed prop to be able to get the full benefit of the engine, but we're stuck here in the US.

p.s.
He lives in Idaho so he's most likely has a ground adjustable prop.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last edit: 3 months 3 days ago by Roger Lee.

Please Log in or Create an account to join the conversation.

More
3 months 3 days ago #19498 by Neville
Replied by Neville on topic Eco mode throttle position
Roger, is the 5300rpm at static run-up or during an in flight condition?

Please Log in or Create an account to join the conversation.

More
3 months 3 days ago - 3 months 3 days ago #19499 by Roger Lee
Replied by Roger Lee on topic Eco mode throttle position
I agree with Bill, but we're stuck.

In level flight. Not static.
It's unfortunate we're stuck with a ground adjustable prop. It would be nice to fully utilize the full capabilities.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last edit: 3 months 3 days ago by Roger Lee.

Please Log in or Create an account to join the conversation.

  • youngwerth
  • youngwerth's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 3 days ago #19500 by youngwerth
Replied by youngwerth on topic Eco mode throttle position
I have a Pipistrel Virus SW with an MT constant speed prop. I have a bunch of pictures of my Dynon display at different power/RPM settings. I have one at 5000 rpms, 21.4" of manifold, 4.9gph, DA 9300' and egt below 1200. I have another at 5000 RPMs, 21.3", 3.9gph, DA 8900' and egts over 1300.

Please Log in or Create an account to join the conversation.

  • youngwerth
  • youngwerth's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 3 days ago #19501 by youngwerth
Replied by youngwerth on topic Eco mode throttle position

Wm Hertzel wrote: The engine selects ECO mode based on Manifold Pressure (MAP) and RPM. Power!
You should be able to maintain ECO Mode up to 900mBar(26") below 5500 rpm.
If you are seeing, for example, 27" or more at 5200rpm, you are Over Propped and lugging the engine.
The engine goes into Power Mode to save itself.

At Wide Open Throttle (WOT), can you make 5500 rpm in a climb, and 5800 in level flight?
Reducing the prop pitch will increase the RPMs and lower the MAP.

The engine will last much longer if you do not over stress it.
It will reward you with lower fuel consumption.


I cannot get the manifold pressure anywhere near yellow or red at any setting that I can remember. However, I don't think I've ever flown below about 3K feet DA. I can make 5800 rpm in a climb or level flight, I generally pull the prop back to 5500 at 500' agl and cruise between 5000 and 5500 rpm.

Something does not seem right here...

Please Log in or Create an account to join the conversation.

  • Bill Hertzel
  • Bill Hertzel's Avatar
  • Away
  • Platinum Boarder
  • Platinum Boarder
More
3 months 3 days ago #19502 by Bill Hertzel
Replied by Bill Hertzel on topic Eco mode throttle position
The numbers you stated should put you in ECO Mode.

It is good that you can get to 5800 in a climb.
I'll bet the climb performance is exceptional.
It is natural that you will throttle back after the initial climb and during cruise.
Otherwise, you risk the possibility of over-revving.
Most owners will limit their climb performance by coarsing the prop enough that they can go wide open in cruise without over-revving.
This is just for the convenience of not having one more thing to think about.

There may be something else going on.
I recommend dumping the engine log file and see what is different in ECO and Power modes.
Time to beak out the BUDS!

Please Log in or Create an account to join the conversation.

  • youngwerth
  • youngwerth's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 3 days ago #19504 by youngwerth
Replied by youngwerth on topic Eco mode throttle position
How can I get my hands on a BUDS dongle?

Please Log in or Create an account to join the conversation.

  • Bill Hertzel
  • Bill Hertzel's Avatar
  • Away
  • Platinum Boarder
  • Platinum Boarder
More
3 months 3 days ago #19505 by Bill Hertzel
Replied by Bill Hertzel on topic Eco mode throttle position
Whoever does your routine maintenance should be in possession of one.
If that person is you...

www.cps-parts.com/catalog/rtxpages/ecuready3lev2.php

It has been argued that every engine should include one from the factory.
It really isn't an option.

Please Log in or Create an account to join the conversation.

  • youngwerth
  • youngwerth's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 3 days ago #19511 by youngwerth
Replied by youngwerth on topic Eco mode throttle position

Wm Hertzel wrote: Whoever does your routine maintenance should be in possession of one.
If that person is you...

www.cps-parts.com/catalog/rtxpages/ecuready3lev2.php

It has been argued that every engine should include one from the factory.
It really isn't an option.


Ouch. I'll try to find someone in my area besides me that does routine maintenance on Rotax engines.

Thanks!

Please Log in or Create an account to join the conversation.

More
3 months 3 days ago #19516 by Roger Lee
Replied by Roger Lee on topic Eco mode throttle position
Isn't your Pipistrel an LSA registry?
Constant speed prop?

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

Please Log in or Create an account to join the conversation.

  • youngwerth
  • youngwerth's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
3 months 3 days ago #19517 by youngwerth
Replied by youngwerth on topic Eco mode throttle position
Experimental Pipistrel.

Please Log in or Create an account to join the conversation.