Charge Motion Control Plates

[RUN RICH]

I am looking for an in depth explanation as to the purpose of it and how it works and how it's controlled.

After a recent ECU update at the dealer my idle and low rpm operation seem smoother. I'm wondering if there's any correlation at all. The car was originally brought in for a stalling issue.

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[Higgs Boson]

Everything got reset in the process so it feels smoother.

The IMRC are closed during low air speed conditions and help create air turbulence for a better mixture and improve response but open to avoid being a restriction as air speed increases.

 

[MaskedRacerX]

The IMRC are closed during low air speed conditions and help create air turbulence for a better mixture and improve response but open to avoid being a restriction as air speed increases.

I've got a question:

Is there effectively just two positions (i.e., open or closed), or is there incremental positions (like 50% open).

 

[RUN RICH]

Everything got reset in the process so it feels smoother.

The IMRC are closed during low air speed conditions and help create air turbulence for a better mixture and improve response but open to avoid being a restriction as air speed increases.

I figured the reflash caused the motor to go into a relearn mode. I have about 400kms so far. It should be fine after 1000kms. I'll pull the battery again for its final reset when I install my GT350R steering wheel.

Is the opening and closing of the flaps a vacuum actuated control or is it done electronically and mechanically through servos.

Is there an in depth explanation of how it works or a video I can view?

I'm curious as to the complete function of the plates and how they operate in relation to the idle.

 

[Higgs Boson]

I've got a question:

Is there effectively just two positions (i.e., open or closed), or is there incremental positions (like 50% open).

As best I can tell, they are open or closed but there is transition time, not to be mistaken for partially open.

I figured the reflash caused the motor to go into a relearn mode. I have about 400kms so far. It should be fine after 1000kms. I'll pull the battery again for its final reset when I install my GT350R steering wheel.

Is the opening and closing of the flaps a vacuum actuated control or is it done electronically and mechanically through servos.

Is there an in depth explanation of how it works or a video I can view?

I'm curious as to the complete function of the plates and how they operate in relation to the idle.

Vacuum actuated. Plates are closed at idle and do not move.

More in depth explanation:
https://patents.google.com/patent/US6155229A

 

[RUN RICH]

As best I can tell, they are open or closed but there is transition time, not to be mistaken for partially open.



Vacuum actuated. Plates are closed at idle and do not move.

More in depth explanation:
https://patents.google.com/patent/US6155229A

Does it run directly off the vacuum reservoir or teed in line or is there an actuator/solenoid controlling vacuum to the CMCV?

 

[Higgs Boson]

Does it run directly off the vacuum reservoir or teed in line or is there an actuator/solenoid controlling vacuum to the CMCV?

pop your hood, lol.

 

[Threebanger]

From the video I saw (somewhere on the interwebs) the CMCV on our motors aren't ECU/mechanically controlled at all. They are flaps in the intake and when vacuum is low (IE idle) they pop up to reduce flow. Once intake velocity reaches a certain point they lay down (forced by airflow) and are completely flush @ WOT.

U can kinda see them in this cut away of the GT-350 intake (2nd & 4th runner).

Now the old CMCV in the 4.6 was controlled but the set up was totally different.

 

[Rhinogt]

There are a whole slew of tables to control the CMCVs in the ECU.

 

[Threebanger]

There are a whole slew of tables to control the CMCVs in the ECU.

Ah, well pooh. I guess they are controlled then.

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