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Exhaust Valve Bypass Mod

 
  #16  
Old 03-26-2015, 05:40 PM
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Glad I asked as I had been leaning toward the super! I don't mind being a bit obnoxious but can't imagine my neighbors will be thrilled if I fire the car up in the enclosed parking garage with the supersport fitted! Setting car alarms off all the time could get old.
 
  #17  
Old 03-26-2015, 05:50 PM
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Originally Posted by kevindhamilton View Post
Glad I asked as I had been leaning toward the super! I don't mind being a bit obnoxious but can't imagine my neighbors will be thrilled if I fire the car up in the enclosed parking garage with the supersport fitted! Setting car alarms off all the time could get old.
Agreed, I do think twice about starting mine very late at night, but that's the nature of a tuned performance exhaust I suppose. I also wonder if a super sports system might just be OTT on the road. I ease off the throttle now when I see a Rozzer ( Police) as I don't want to make my self too conspicuous. But its changed my enjoyment of the car, the fact its a Bentley to me doesn't mean it should ott quiet and refined, I leave that to Rollers, I like to hear a car and I bet the original Bentleys of the 20/30's weren't quiet either .
 
  #18  
Old 09-14-2015, 04:23 PM
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Sunnyside, do you have a video? Any mods to the center pipes/resonators/secondary cats?
 
  #19  
Old 10-05-2015, 04:33 PM
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Originally Posted by BMT216A View Post
Once finished you have officially "worked" on your Bentley.
Nice to see enthusiasts here who aren't afraid to work on their cars!!!!
 
  #20  
Old 10-05-2015, 06:18 PM
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Just did mine. Took about 3 mins total. With my new Xpipe im so Happy :-) :-)

Cliff
 

Last edited by cdavis43; 10-05-2015 at 06:21 PM.
  #21  
Old 10-06-2015, 07:10 AM
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Originally Posted by cutty71 View Post
Nice to see enthusiasts here who aren't afraid to work on their cars!!!!
I didn't say I wasn't afraid. 😜
 
  #22  
Old 01-08-2017, 09:01 AM
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Mission Accomplished!

Thanks for the info guys, its only taken me almost 2 years to get around to doing it!

Sounds great though well worth the 10 mins taken to complete and 90 minutes to "road test"
 
  #23  
Old 01-08-2017, 09:37 AM
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My 2016 W12

I did the mod but I got to much droning on the freeway. Guess only option is to get an exhaust? Or do the drone as well?

Cliff
 
  #24  
Old 11-02-2018, 02:04 PM
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Does this effect the engine running? Isn't there something about the valves being there to facilitate burning and running rich without them?
 
  #25  
Old 11-02-2018, 03:30 PM
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They aid in catalytic converter warm up at cold start, open loop.
 
  #26  
Old 11-02-2018, 03:32 PM
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Originally Posted by 1eapplebaum View Post
They aid in catalytic converter warm up at cold start, open loop.
So best to leave them alone? Do they default to open in either of the 'S' positions on the gearshift?
 
  #27  
Old 11-02-2018, 03:38 PM
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There are probably many opinions on this one. The w12 GT's aren't the only cars with this setup. People bypass them with success. Being conservative, might not want to do it? Catalytic converters are difficult and expensive to change on our cars
 
  #28  
Old 11-02-2018, 03:54 PM
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Originally Posted by 1eapplebaum View Post
There are probably many opinions on this one. The w12 GT's aren't the only cars with this setup. People bypass them with success. Being conservative, might not want to do it? Catalytic converters are difficult and expensive to change on our cars
My Ducati has one as standard but it's deleted with the Acrapovic Exhaust. However, the cats are also deleted.

 
  #29  
Old 11-02-2018, 04:01 PM
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One of the intentions of the flap is for a fast catalytic converter warm up to open loop. This is beneficial in a cold climate in the winter, ie Chicago.

My DUC. 1098r.


 
  #30  
Old 11-03-2018, 03:39 AM
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That valve looks identical to the ones on Ferrari 360 ,s .
You just pull the pipe off and put a self tapper in it .
No detrimental effects , no ECU, s having fits ,no spurious CEL ,s .

Not sure which is worse B or F cars for hissy fits regarding throwing CEL.s - fuel or seated fuel caps , or just a strange way you looked at it

It only the OEM system and very few aftermarket that use the vac valve .
Same as B , sport mode and over a certain rpm , I think 4500 it opens .
Sort of neighbourliness thing really to pass a notional noise test .
How ever @ cold start as said above you get tick over at 12-1500 rpm for say 30 secs to 1-1/2 minutes , with what sounds like it’s open .So I conclude that’s all it takes to warm the cats less than 2 mins - on a Ferrari .

Thought about it my self ( had a race exhaust on the 360 ) .TBO like the sound with stock esp as designed circa 2000 rpm on the motorways , the serenity, lux barge experience.

I might do it ,with a view to reverse it if it drones on the motorway.
Thing is makes a mockery of the recent thread on Naim ice upgrades .

hmm , Ferrari,s the other way the stereo is ornamental ,as is sensible conversation


I would say get your sound fix / kick from something else - Duc or Fezza / Lambo , pork GT3 etc
 

Last edited by John Fiammetta; 11-03-2018 at 03:45 AM.

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