Cirrus SR22T - Leaning mixture in cruise REDUCES engine power. It should INCREASE it

User Support Hub Aircraft & Systems
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Are you using Developer Mode or made changes in it?

No

Have you disabled/removed all your mods and addons? If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the Community Support section.

No, but it shouldn’t be relevant to this particular bug

Which aircraft are you reporting an issue about? (Please also add the proper tag for it)

Cirrus SR22T

Which aircraft version are you experiencing this issue on? (You can find this listed in the Content Manager under the Aircraft Name)

0.2.13

Brief description of the issue:

The aircraft shows a DECREASE in engine power output when leaning the mixture to the indicated cruise setting rather than an INCREASE.

Provide Screenshot(s)/video(s) of the issue encountered:

Detailed steps to reproduce the issue encountered:

In the SR22T, climb to at least 3000 feet MSL and reduce power to 75% max. When the G1000 indicates the optimum fuel flow target, lean the mixture to meet it. You will see that the indicated engine power DROPS rather than INCREASING as it should.

Here is a real Cirrus video in which you can clearly see that effective engine power INCREASES when leaning: https://www.youtube.com/watch?v=XEKz7H6CEv0

PC specs and/or peripheral set up if relevant:

AMD Ryzen 9 3900XT, nVIDIA GeForce RTX3090, 32GB RAM

Build Version # when you first started experiencing this issue:

1.35.21.0

:loudspeaker: For anyone who wants to contribute on this issue, Click on the button below to use this template:

Do you have the same issue if you follow the OP’s steps to reproduce it?

Provide extra information to complete the original description of the issue:

If relevant, provide additional screenshots/video:

2

Do you have the same issue if you follow the OP’s steps to reproduce it?

No

Provide extra information to complete the original description of the issue:

Please see video where I pull MP to 30.5 and then adjust mixture to Cyan Target. The Power Percentage Increases as expected. This is identical to the RL settings demo’d by the pilot in the Topic Owner’s link.

If relevant, provide additional screenshots/video:

https://www.youtube.com/watch?v=Ab2uT01K4ts

1 Like
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Hmm… ok, I’ll retest since their was a patch today.

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The beta build pushed on Friday that delivered the 22T initially is the same build as pushed today to all non-Beta testers.

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Do you have the same issue if you follow the OP’s steps to reproduce it?

No

Provide extra information to complete the original description of the issue:

Leaning the mixture increases performance for me provided that I am not already lean of peak, at which point further leaning it will decrease performance and starve the engine as expected. You can try monitoring the EGT on the engine page, set mixture to fill rich at cruise altitude (which should cause a dramatic loss of performance if you are at a high enough altitude) and then watch the EGT increase as you lean. Note that RPM in the SR22T is a bit different from something like the 172. I don’t know how it works, but it’ll generally try to maintain a set RPM regardless of the mixture setting. Someone with more experience could probably explain that.

If relevant, provide additional screenshots/video:

6

Here’s some more info from WT about some of those issues. The prop governor on the -22 works differently than most planes we operate.
Regards
https://forums.flightsimulator.com/t/sr22-engine-remains-at-full-throttle-solved/619239/16

1 Like
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As you lean, power will increase until you get to peak power (right around peak EGT also). As you lean further to the carrot, power will decrease as you get to best economy, which is the cyan target.

The cyan target is not a best power target but a best economy/engine life target.

This is an exceptional reference: as you can see, as he leans the power goes from about 80 to almost 90, and then just before he gets to the target the power begins to go back to roughly where he started as he leans additionally to the target.

6 Likes
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Solution marked.

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