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Exhaust Valve Bypass Mod

 
  #1  
Old 10-23-2014, 02:46 AM
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Exhaust Valve Bypass Mod

Hi all - I wonder if some kind sole would help me....?

I recently bought a 2007 GTC, and I want to disconnect the vacuum tubes that control the exhaust valves... to leave them permanently noisy.

I had a quick look under the car last night (squeezed under as dont have a ramp ), but I couldn't tell what pipes need disconnecting and plugging.

Can anyone help, preferably with a picture if possible?

I remember seeing a pic a while ago, but cannot find it anymore!

Thanks for any help!

Simon
 
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Old 10-23-2014, 04:41 AM
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Look at the end of each rear silencer and you will see a round actuator with an arm going to the butterfly valve. Simply remove the vacuum pipe from each actuator and plug it with a 5mm bolt or similar, job done.
 
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Old 10-24-2014, 01:49 AM
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Thanks for that - it makes sense in my head - but not when I looked under thecar last night - dont suppose anyone has a pic?
 
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Old 10-24-2014, 10:22 AM
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They look something like this.
 
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Old 10-27-2014, 06:42 AM
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Brilliant - thanks for your help.. sounds better now - happy again!
 
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Old 10-27-2014, 11:48 AM
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So you got the modification actioned then?
 
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Old 10-27-2014, 02:02 PM
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Yes. All good. Took the under tray at the rear off to be able to get in easier.

Appreciate your help
 
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Old 03-14-2015, 08:09 AM
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Remove the bottom cover.

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8mm socket, one was 10mm for some reason, plus T25 for body screws.

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Flapper valve you can just barely see is activated by the two actuators.

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Pull the rubber hose off. Block. Tape out of the way.

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Old 03-14-2015, 08:11 AM
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Once finished you have officially "worked" on your Bentley.
 
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Old 03-15-2015, 12:38 AM
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Do you know at what RPM/speed the valves open/close?
I haven't noticed much difference!
 
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Old 03-15-2015, 07:01 AM
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I would imagine that it isn't RPM related but rather, as it is vacuum operated, they would open under full throttle.
Mine were already done when I bought the car and I do like the sound of it.
 
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Old 03-15-2015, 05:52 PM
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An even better mod is to but a quick silver sports rear exhaust. Its sounds out of this world........really, not a Ferrari sound but more a Bugatti / Aston sound .Deep, loud and poppin.
 
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Old 03-15-2015, 06:41 PM
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I don't know when they open, other than when in sport mode. As its to keep the car quiet at low revs/speed you would imagine it's one or both of those.

It's more pleasant to the ear on the inside, and one would imagine more delightful for those on the outside too.
 
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Old 03-26-2015, 01:52 PM
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@sunnyside, do you have the quicksilver sport or supersport rear exhaust?
 
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Old 03-26-2015, 02:07 PM
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Originally Posted by kevindhamilton View Post
@sunnyside, do you have the quicksilver sport or supersport rear exhaust?
Just the Sport and I really wouldn't like to have the super Sports based on the sports exhaust I have. It really is quite loud enough for everyday driving.
Everyone outside looks when I start up and when driving round. It really is impressive from outside. Inside the car its loud enough to make you smile all day long, but on long runs at speed the sound melts into the background unless you open her up.
Driving through tunnels puts a grin on the face from ear to ear.
I would say the only down side to this exhaust is the cold start, it really is aggressive until the idle speed drops and the engine warms up. "
ITS LOUD"
 

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