Exhaust Valve Bypass Mod
#16
03-26-2015, 05:40 PM
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
03-26-2015, 05:50 PM
Registered User
Join Date: May 2010
Location: Scotland
Posts: 1,454
Rep Power: 95 
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.
#22
01-08-2017, 09:01 AM
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"
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"
#24
11-02-2018, 02:04 PM
Does this effect the engine running? Isn't there something about the valves being there to facilitate burning and running rich without them?
#25
11-02-2018, 03:32 PM
So best to leave them alone? Do they default to open in either of the 'S' positions on the gearshift?
#26
11-02-2018, 03:54 PM
#27
11-03-2018, 03:39 AM
Registered User
Join Date: Dec 2017
Location: switzerland
Age: 61
Posts: 414
Rep Power: 53 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
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.
#28
11-03-2018, 05:04 AM
No worries disconnecting the vac tubes at the exhaust, no negative impact on cats warmup, ECU, CELs, etc, etc.
The valves stay closed under vacuum (which is idle to mid range RPM where much to some vacuum is present) then open at WOT or high RPM. They open to offer a little bit more exhaust flow in PE.
Exhaust sounds a little louder at idle through the entire RPM range disconnected. Performance will be slightly better. Exhaust sound is a personal preference. What one person thinks is loud or droney another person thinks is too quiet. Strictly personal.
On C6 Corvettes, where I first experienced these, they were a Factory option (called NPP exhaust). It was sold as a modest performance upgrade. Some cars (same engine) had a single functional exhaust tip each side, others had a dual exhaust each side, one of which opened under the absence of vacuum which was mid to high RPM or WOT. The NPP cars were specced at 436hp; the non-NPP cars at 430HP. So a 6 HP gain from the small extra exhaust gain at peak performance.
Disconnect and block the vacuum tubes at the rear exhaust valves, as shown here, and enjoy. Mine are disconnected, and on the Vette too.
The valves stay closed under vacuum (which is idle to mid range RPM where much to some vacuum is present) then open at WOT or high RPM. They open to offer a little bit more exhaust flow in PE.
Exhaust sounds a little louder at idle through the entire RPM range disconnected. Performance will be slightly better. Exhaust sound is a personal preference. What one person thinks is loud or droney another person thinks is too quiet. Strictly personal.
On C6 Corvettes, where I first experienced these, they were a Factory option (called NPP exhaust). It was sold as a modest performance upgrade. Some cars (same engine) had a single functional exhaust tip each side, others had a dual exhaust each side, one of which opened under the absence of vacuum which was mid to high RPM or WOT. The NPP cars were specced at 436hp; the non-NPP cars at 430HP. So a 6 HP gain from the small extra exhaust gain at peak performance.
Disconnect and block the vacuum tubes at the rear exhaust valves, as shown here, and enjoy. Mine are disconnected, and on the Vette too.
#29
11-03-2018, 07:18 AM
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
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
#30
11-11-2018, 08:44 AM
I've been looking at what would be needed to create a button for the driver to override the exhaust valves. It looks fairly easy, a three port valve and a radio controlled relay on 433mhz . The valve would be installed to make the vacuum line look at either the valves or a dead end. The valves would look at either the vacuum line or fresh air. The 3port valve would be controlled by a 12dc radio relay. The keyfob for this would be learned to one of the three garage buttons on the roof.