Jaguar Forums - Jaguar Enthusiasts Forum

XK / XKR ( X150 ) 2006 - 2014

Semi-active exhaust valve removal

Thread Tools
 
Search this Thread
 
  #1  
Old 10-24-2020, 05:55 AM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default Semi-active exhaust valve removal
Hello, is it possible to remove this semi-active valve, which means removing the spring to leave the valve always open and what would be the result?
 
Reply Like
The following 2 users liked this post by Xk646:
GGG (10-24-2020), Richardnero1 (07-26-2021)
  #2  
Old 10-24-2020, 06:02 AM
jimbov8's Avatar
Veteran Member
Join Date: Jul 2012
Location: Uk
Posts: 2,069
Received 664 Likes on 572 Posts
Default
Have someone start the car from cold whilst you stand behind it and listen, if you can remove the spring then it will sound like that all the time.
 
Reply Like
  #3  
Old 10-24-2020, 06:29 AM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by jimbov8
Have someone start the car from cold whilst you stand behind it and listen, if you can remove the spring then it will sound like that all the time.
For the mechanics or the loss of power that does not risk anything?
 
Reply Like
  #4  
Old 10-24-2020, 07:27 AM
jahummer's Avatar
Veteran Member
Join Date: Dec 2008
Location: Florida
Posts: 6,250
Received 2,380 Likes on 1,490 Posts
Default
Or just pull fuse 19....
 
Reply Like
The following 3 users liked this post by jahummer:
guy (11-25-2023), ralphwg (10-24-2020), Stuart S (10-24-2020)
  #5  
Old 10-24-2020, 07:31 AM
jimbov8's Avatar
Veteran Member
Join Date: Jul 2012
Location: Uk
Posts: 2,069
Received 664 Likes on 572 Posts
Default
Originally Posted by jahummer
Or just pull fuse 19....
The semi active system is not electrically controlled.
 
Reply Like
  #6  
Old 10-24-2020, 07:56 AM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by jimbov8
The semi active system is not electrically controlled.
Yes I do this but blocked the springs in opening would do the same thing, right?
 
Reply Like
  #7  
Old 10-24-2020, 10:19 AM
kj07xk's Avatar
Veteran Member
Join Date: Jan 2015
Location: Naperville, Illinois USA
Posts: 4,676
Received 2,012 Likes on 1,345 Posts
Default
Originally Posted by Xk646
Yes I do this but blocked the springs in opening would do the same thing, right?
Yes. Be interesting to see how you do it. I cheated and put an XKR back box on my XK, so the valves are normally open without the vacuum required to close them.
 
Reply Like
The following users liked this post:
jimbov8 (10-24-2020)

Trending Topics

  #8  
Old 10-24-2020, 10:48 AM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by kj07xk
Yes. Be interesting to see how you do it. I cheated and put an XKR back box on my XK, so the valves are normally open without the vacuum required to close them.
Do I have to find a way to block the springs by cutting them out maybe?
 
Reply Like
  #9  
Old 10-24-2020, 11:18 AM
Stuart S's Avatar
Veteran Member
Join Date: Aug 2010
Location: Atlanta suburbs
Posts: 9,311
Received 6,320 Likes on 3,465 Posts
Default
Why are you making more work for yourself than necessary doing something that is not easily reversible by the next owner? Keep it simple and remove fuse 19. It's really easy.

https://www.jaguarforums.com/forum/w...ad.php?t=87400
 
Last edited by Stuart S; 10-24-2020 at 11:23 AM. Reason: Added link.
Reply Like
  #10  
Old 10-24-2020, 11:29 AM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by Stuart S
Why are you making more work for yourself than necessary doing something that is not easily reversible by the next owner? Keep it simple and remove fuse 19. It's really easy.

https://www.jaguarforums.com/forum/w...ad.php?t=87400
No fuse on the xk you confuse with xkr
 
Last edited by GGG; 10-24-2020 at 01:14 PM. Reason: Traduire la citation en Anglais
Reply Like
The following 2 users liked this post by Xk646:
Cee Jay (10-24-2020), jimbov8 (10-24-2020)
  #11  
Old 10-24-2020, 11:31 AM
jimbov8's Avatar
Veteran Member
Join Date: Jul 2012
Location: Uk
Posts: 2,069
Received 664 Likes on 572 Posts
Default
Originally Posted by Xk646
[QUOTE = Stuart S; 2307567] Pourquoi faites-vous plus de travail que nécessaire en faisant quelque chose qui n'est pas facilement réversible par le prochain propriétaire? Restez simple et retirez le fusible 19. C'est vraiment facile.

https://www.jaguarforums.com/forum/w...ad.php?t=87400 [/ QUOTE]
No fuse on the xk you confuse with xkr
At least you understand.
 
Reply Like
  #12  
Old 10-24-2020, 11:39 AM
Cee Jay's Avatar
Veteran Member
Join Date: Apr 2013
Location: Kaysville, Utah, US
Posts: 10,852
Received 5,431 Likes on 3,207 Posts
Default
Some guys have used heavy gauge wire to tie back the valves. That way it's still revertible to stock.
 
Reply Like
The following users liked this post:
MarkyUK (10-25-2020)
  #13  
Old 10-24-2020, 11:54 AM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by Cee Jay
Some guys have used heavy gauge wire to tie back the valves. That way it's still revertible to stock.
And does that change the behavior of the engine? Less torque for example? What are they really for? :confus:
 
Reply Like
  #14  
Old 10-24-2020, 11:59 AM
jahummer's Avatar
Veteran Member
Join Date: Dec 2008
Location: Florida
Posts: 6,250
Received 2,380 Likes on 1,490 Posts
Default
Originally Posted by Xk646
[QUOTE = Stuart S; 2307567] Why are you making more work for yourself than necessary doing something that is not easily reversible by the next owner? Keep it simple and remove fuse 19. It's really easy.

https://www.jaguarforums.com/forum/w...ad.php?t=87400 [/ QUOTE]
No fuse on the xk you confuse with xkr
Perhaps if you had clarified more than just saying you have a 2008 X150....most who ask this question have active valves exhaust which can be defeated by removing fuse 19....
 
Last edited by GGG; 10-24-2020 at 01:15 PM.
Reply Like
  #15  
Old 10-24-2020, 12:02 PM
Cee Jay's Avatar
Veteran Member
Join Date: Apr 2013
Location: Kaysville, Utah, US
Posts: 10,852
Received 5,431 Likes on 3,207 Posts
Default
Originally Posted by Cee Jay
Some guys have used heavy gauge wire to tie back the valves. That way it's still revertible to stock.
Originally Posted by Xk646
And does that change the behavior of the engine? Less torque for example? What are they really for? :confus:
Manually opening the valves instead of letting them open themselves by overcoming spring pressure with exhaust back pressure really only makes the exhaust tone more aggressive earlier.
It's all about the sound, mate.
 
Reply Like
  #16  
Old 10-24-2020, 12:04 PM
jimbov8's Avatar
Veteran Member
Join Date: Jul 2012
Location: Uk
Posts: 2,069
Received 664 Likes on 572 Posts
Default
Originally Posted by Cee Jay
Some guys have used heavy gauge wire to tie back the valves. That way it's still revertible to stock.
Where do you put this wire on a XK back box?


 
Reply Like
  #17  
Old 10-24-2020, 12:11 PM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by Cee Jay
Manually opening the valves instead of letting them open themselves by overcoming spring pressure with exhaust back pressure really only makes the exhaust tone more aggressive earlier.
It's all about the sound, mate.
OK this is only for the sound it's okay because I don't want to change the behavior of the engine
 
Reply Like
  #18  
Old 10-24-2020, 12:14 PM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by jahummer
Perhaps if you had clarified more than just saying you have a 2008 X150....most who ask this question have active valves exhaust which can be defeated by removing fuse 19....
All were in me question no spring in an xkr
 
Reply Like
The following users liked this post:
jimbov8 (10-24-2020)
  #19  
Old 10-24-2020, 02:09 PM
Stuart S's Avatar
Veteran Member
Join Date: Aug 2010
Location: Atlanta suburbs
Posts: 9,311
Received 6,320 Likes on 3,465 Posts
Default
Originally Posted by Xk646
OK this is only for the sound it's okay because I don't want to change the behavior of the engine
I may be mistaken but, as I recall, the active exhaust is closed at low engine speeds to increase backpressure, which maximizes low-end torque.

I've had Fuse 19 out for many years and have never felt that my XKR was lacking in low end torque. Whatever the loss may be, for me it's worth it to get the improved exhaust note.
 
Reply Like
  #20  
Old 10-24-2020, 02:15 PM
Xk646's Avatar
Member
Thread Starter
Join Date: Oct 2020
Posts: 51
Received 8 Likes on 6 Posts
Default
Originally Posted by Stuart S
I may be mistaken but, as I recall, the active exhaust is closed at low engine speeds to increase backpressure, which maximizes low-end torque.

I've had Fuse 19 out for many years and have never felt that my XKR was lacking in low end torque. Whatever the loss may be, for me it's worth it to get the improved exhaust note.
That's what I wanted to have that changes the torque at low revs! OK
 
Reply Like



Advanced Search
Quick Reply: Semi-active exhaust valve removal


Reply Closed Thread Share

All times are GMT -5. The time now is 11:42 PM.