AJ133 5.0 Symposer
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Joined: Dec 2017
Posts: 63
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From: Georgia
AJ133 5.0 Symposer
I get what this is trying to do but does anybody know "under what conditions" the ECM opens the valve? Is the valve fuse controlled so we can keep it open kinda like Fuse 43 and active exhaust?
If not is this something that can be changed in the ECM to always open?
If not is this something that can be changed in the ECM to always open?
Symposer
Historically, automobile manufacturers have focused on
reducing the level of engine acoustics within the cabin.
With the introduction of the new 5.0-liter V8 engine,
development engineers have deliberately accentuated the
acoustic feedback into the cabin in an effort to further
increase the driving experience.
An integral part of this development is the introduction of
a symposer into the engine air intake system of the SC
engine. The symposer is mounted on the rear of the engine
and is connected directly to the RH intake manifold.
Engine order pulsations from the intake system are fed
into the symposer, which picks out the pulsations that are
within the target frequency range. These accentuated V8
engine acoustics are then directed into the cabin.
The symposer is a mechanical device that is operational
when the engine is running. However, a vacuum operated
valve, which is controlled by the ECM, only allows the
acoustics into the cabin under certain conditions. This is to
achieve the desired engine sound quality in the cabin.
Historically, automobile manufacturers have focused on
reducing the level of engine acoustics within the cabin.
With the introduction of the new 5.0-liter V8 engine,
development engineers have deliberately accentuated the
acoustic feedback into the cabin in an effort to further
increase the driving experience.
An integral part of this development is the introduction of
a symposer into the engine air intake system of the SC
engine. The symposer is mounted on the rear of the engine
and is connected directly to the RH intake manifold.
Engine order pulsations from the intake system are fed
into the symposer, which picks out the pulsations that are
within the target frequency range. These accentuated V8
engine acoustics are then directed into the cabin.
The symposer is a mechanical device that is operational
when the engine is running. However, a vacuum operated
valve, which is controlled by the ECM, only allows the
acoustics into the cabin under certain conditions. This is to
achieve the desired engine sound quality in the cabin.
Veteran Member
Joined: Feb 2014
Posts: 9,020
Likes: 3,658
From: Adelaide, South Australia
There are a couple of other threads and posts about the symposer, search and ye shall find (maybe!).
I remember posing this exact same question a year or two ago and I don't think anyone found a definitive answer.
I remember posing this exact same question a year or two ago and I don't think anyone found a definitive answer.
Veteran Member
Joined: May 2015
Posts: 3,940
Likes: 1,304
From: Northern California
I hated that it added sound to the cabin because it seemed like there would be a sudden switch from "normal" to "disembodied sound reverberating through the cabin." When it activated I couldn't hear the intake noise or the exhaust. It was just an internal drone, and it couldn't be switched like the active exhaust. I think the car makes great noises on its own, and I'm *much* happier with the symposer defeated. I'd like to remove it to clean up the engine bay a bit but that's orders of magnitude more work.
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f-xo
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Apr 24, 2014 06:00 PM
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