2007 Audi S8 Exhaust valve solenoid location
#1
2007 Audi S8 Exhaust valve solenoid location
Thanks for all the excellent information on this forum!
I plan to mount a exhaust valve remote control, that allows me to either run the stock exhaust valve setup (the exhaust valves are then open from 3500 rpm) or to drive with open valves at all rpm (for enjoying the V10 engine even more). :-)
I have tried to search on internet, but cannot find any information where to locate the solenoid that controls the vacuum to the rear exhaust valves.
Thank you for helping me out!
I plan to mount a exhaust valve remote control, that allows me to either run the stock exhaust valve setup (the exhaust valves are then open from 3500 rpm) or to drive with open valves at all rpm (for enjoying the V10 engine even more). :-)
I have tried to search on internet, but cannot find any information where to locate the solenoid that controls the vacuum to the rear exhaust valves.
Thank you for helping me out!
#2
AudiWorld Super User
Right behind back bumper on both sides
They are right there after the very last can and where the pipes start to exit the back sill.
On W12's, they stay open if you pull the vacuum hoses, though I understand the S8's may do the opposite. Easy to try.
On W12's, they stay open if you pull the vacuum hoses, though I understand the S8's may do the opposite. Easy to try.
#3
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It seems to vary on the W12, mine fail shut when hoses are pulled, others have experienced this too.
#4
AudiWorld Super User
Mine do stay open when pulled
...on a 2006.
Ultimately I decided it was probably a performance subtract at the margin so abandoned it. Officially Audi says it was for sound control, but in general on an NA motor some increased exhaut back pressure at low RPM's gives a bit more torque as a rule of thumb. One of the hidden downsides of using a freer flowing exhaust. Since it made only little difference sound wise, I just put it back.
Ultimately I decided it was probably a performance subtract at the margin so abandoned it. Officially Audi says it was for sound control, but in general on an NA motor some increased exhaut back pressure at low RPM's gives a bit more torque as a rule of thumb. One of the hidden downsides of using a freer flowing exhaust. Since it made only little difference sound wise, I just put it back.
#5
I managed to break both the locking tabs on the cable connector that goes into the soleonid valve. Does anyone know if this can be bought from Audi, and the part #?
#6
I used some bailing type wire to open mine at one point. There is a little hole in the bracket where it attaches to the exhaust. I put the wire through that hole, pulled the valve open and then wrapped the wire around the "arm piece" to hold it open. I then just twisted the wire with a pair of pliers to hold it in place.
I didn't notice that big of a difference in sound and ended up just removing the wire after a couple of weeks. Was very easy (less than 5 minutes for both) and was also really easy to remove.
Would be nice if it had a switch like the sport exhaust on my Porsche was. It made zero difference in performance but the sound was great and always made it seem like you were going faster than you were. It was great that you could make it quiet when you wanted it that way.
I didn't notice that big of a difference in sound and ended up just removing the wire after a couple of weeks. Was very easy (less than 5 minutes for both) and was also really easy to remove.
Would be nice if it had a switch like the sport exhaust on my Porsche was. It made zero difference in performance but the sound was great and always made it seem like you were going faster than you were. It was great that you could make it quiet when you wanted it that way.
#7
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I'm sure there could be some coding to turn on/off this solenoid through vcds. Probably just not discovered yet.
I thought about having it wide open 100% of the time also but I do agree with having some backpressure at lower rpms.
Don't worry about buying a new connector, just more of a headache. Saftey wire or zip-tie it back together and forget about it .
I thought about having it wide open 100% of the time also but I do agree with having some backpressure at lower rpms.
Don't worry about buying a new connector, just more of a headache. Saftey wire or zip-tie it back together and forget about it .
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#8
I'm sure there could be some coding to turn on/off this solenoid through vcds. Probably just not discovered yet.
I thought about having it wide open 100% of the time also but I do agree with having some backpressure at lower rpms.
Don't worry about buying a new connector, just more of a headache. Saftey wire or zip-tie it back together and forget about it .
I thought about having it wide open 100% of the time also but I do agree with having some backpressure at lower rpms.
Don't worry about buying a new connector, just more of a headache. Saftey wire or zip-tie it back together and forget about it .
#9
You could check the Porsche forum (Rennlist 996 forum). Many owners there add the sport exhaust to their cars but very few use the vacuum switch and related hardware to be able to manually open and close the exhaust flap. Without the hardware the Porshe sport exhaust just stays open all the time. Their exhaust has the same flap as the S8 exhaust.
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