Just a curiosity about the exhaust
#1
Just a curiosity about the exhaust
Hello everyone,
I've ordered an F-type S V6; and so now I've the time for study carefully the car's specs:
I had a look at the exhaust system, exactly at the internal section of the rear muffler. Honestly, jaguar has done an impressive work on the exhaust system, every single detail it's just extremely accurate in order to make the car sounding phenomenal. By the way, I ask me how the exhaust gas get out the muffler when the electrical valve is in closed position? Do they pass from those tiny tubes in front of the tubes without the valves? Aren't they too small? I mean they would create an high back pressure in the exhaust.
Look at the image down here, anyone could have an answer to my question?
Thank you.
I've ordered an F-type S V6; and so now I've the time for study carefully the car's specs:
I had a look at the exhaust system, exactly at the internal section of the rear muffler. Honestly, jaguar has done an impressive work on the exhaust system, every single detail it's just extremely accurate in order to make the car sounding phenomenal. By the way, I ask me how the exhaust gas get out the muffler when the electrical valve is in closed position? Do they pass from those tiny tubes in front of the tubes without the valves? Aren't they too small? I mean they would create an high back pressure in the exhaust.
Look at the image down here, anyone could have an answer to my question?
Thank you.
#2
I can't answer your specific question because I own a base car without the active exhaust. Obviously I can't see inside the muffler housing, but I can say the std. sport exhaust has 2 straight pipes into the muffler without the valves.
What is significant is that it does not have those J-pipes that flair off into the muffler ahead of the valves. Otherwise it looks the same as your picture.
My impression is that it is loud all the time, and contrary to conventional wisdom, it the active exhaust system may just quiet the car down when the valves are closed, but the base "sport" system is just louder all the time.
I commented previously here that may be something that Jaguar would rather not talk about, because the active exhaust is an option and something featured in all the marketing.
What is significant is that it does not have those J-pipes that flair off into the muffler ahead of the valves. Otherwise it looks the same as your picture.
My impression is that it is loud all the time, and contrary to conventional wisdom, it the active exhaust system may just quiet the car down when the valves are closed, but the base "sport" system is just louder all the time.
I commented previously here that may be something that Jaguar would rather not talk about, because the active exhaust is an option and something featured in all the marketing.
#4
#5
#6
What I'm wondering is whether the valve is open or closed to make it louder?
Closed is the answer that makes the most sense to me because it bypasses the chamber inside the muffler forcing everything through those J-pipes. The std (non-active) exhaust is open all the time, because there are no valves. However, people most often refer to the operation of the active exhaust system as opening the valves.
Closed is the answer that makes the most sense to me because it bypasses the chamber inside the muffler forcing everything through those J-pipes. The std (non-active) exhaust is open all the time, because there are no valves. However, people most often refer to the operation of the active exhaust system as opening the valves.
#7
What I'm wondering is whether the valve is open or closed to make it louder?
Closed is the answer that makes the most sense to me because it bypasses the chamber inside the muffler forcing everything through those J-pipes. The std (non-active) exhaust is open all the time, because there are no valves. However, people most often refer to the operation of the active exhaust system as opening the valves.
Closed is the answer that makes the most sense to me because it bypasses the chamber inside the muffler forcing everything through those J-pipes. The std (non-active) exhaust is open all the time, because there are no valves. However, people most often refer to the operation of the active exhaust system as opening the valves.
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#10
My understanding:
Dynamic exhaust valve is closed in quiet mode.
Standard exhaust could be as loud as open valve dynamic exhaust (if the internal baffling is the same as that on the primary flow path of the dynamic exhaust.
Open-valved dynamic exhaust is a bit more free flowing due to multiple pathways (less flow restriction) through a small section of the exhaust system (again if the primary pathways are similar to each other).
Dynamic exhaust valve is closed in quiet mode.
Standard exhaust could be as loud as open valve dynamic exhaust (if the internal baffling is the same as that on the primary flow path of the dynamic exhaust.
Open-valved dynamic exhaust is a bit more free flowing due to multiple pathways (less flow restriction) through a small section of the exhaust system (again if the primary pathways are similar to each other).
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Foosh (01-22-2015)
#12
#15
Here's the catalog page link. Active exhaust is the second link on this page...
https://www.dropbox.com/sh/mmo4oy6ts...0f-type%20docs
#16
Yes, that was a typo, but I don't know about louder from a measured dBA perspective, just a different frequency/tone. V8s always have a lower frequency rumble, which can be more painful at the same decibel level.
Last edited by Foosh; 01-22-2015 at 02:43 PM.
#17
Ok. I had a few problems getting it to download effectively from Dropbox, but you definitely don't need to sign in.
Here's the catalog page link. Active exhaust is the second link on this page...
https://www.dropbox.com/sh/mmo4oy6ts...0f-type%20docs
Here's the catalog page link. Active exhaust is the second link on this page...
https://www.dropbox.com/sh/mmo4oy6ts...0f-type%20docs
That's excellent! I haven't seen anything with that level of detail yet. It appears on the V8, that the outer pipes are only used when the valves are open.
#18
Ok. I had a few problems getting it to download effectively from Dropbox, but you definitely don't need to sign in.
Here's the catalog page link. Active exhaust is the second link on this page...
https://www.dropbox.com/sh/mmo4oy6ts...0f-type%20docs
Here's the catalog page link. Active exhaust is the second link on this page...
https://www.dropbox.com/sh/mmo4oy6ts...0f-type%20docs
Obviously, this is just a V6-only issue since all V8s have active exhaust std. It also provides some insight as to why active exhaust is becoming std. on base cars in 2016.
It's a rather curious paradox that the only reason for one to order the active exhaust option on a base car is to have ability make it "quieter," but I doubt very seriously anyone who ordered that expensive option understood that.
Last edited by Foosh; 01-22-2015 at 03:07 PM.
#19
Convoluted....
#20
I've found some more information about the F Type exhaust over in this thread in the XK forum...
https://www.jaguarforums.com/forum/x...ptions-112630/
https://www.jaguarforums.com/forum/x...ptions-112630/