XK / XKR ( X150 ) 2006 - 2014

How about electric cutout exhaust valves?

 
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Old 04-28-2019, 03:45 AM
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Default How about electric cutout exhaust valves?

Anyone done it? Sounds like a nice option to be loud when I want! :-)
 
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Old 04-28-2019, 11:07 AM
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Sure, it'd be loud, but a BAD loud. Class and decorum, my son.
 
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Old 04-28-2019, 11:25 AM
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Originally Posted by Cee Jay View Post
Sure, it'd be loud, but a BAD loud. Class and decorum, my son.
Yes, I thought of that and wonder if I could get a nicer sound by narrowing the pipe after the valve to maybe 20-30mm?
 

Last edited by peterv8; 04-28-2019 at 11:27 AM.
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Old 04-28-2019, 12:13 PM
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I'd think it'd sound exactly like a leaky exhaust system, with the FUT-FUT-FUT sound.

Now, maybe by hooking up something like glass packs or something past the cut-out it would sound OK, and add another exit line for exhaust, like a quad instead of duals (no, quad tailpipes don't count).

I have something like this when I street drive my P/S Mustang II, I have removable caps on the straight exhaust which block the quick exit and sends it out the back through a couple small mufflers.
 

Last edited by Cee Jay; 04-28-2019 at 12:16 PM.
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Old 04-28-2019, 08:31 PM
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Peter drop the rear muffler and that will give you a good indication of how it will sound
 
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Old 04-29-2019, 12:33 AM
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Sounds pretty cool!:-D

 
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Old 04-29-2019, 06:12 AM
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The only thing that concerns me here is the exhaust coming back into the cabin. If you split the quad tips so that the inside are routed from the cut outs and the outside is the full exhaust then you would dump the fumes out the rear and not under the car. My 2 cents. By the way my PAE is loud enough for me and the LEO's.
 
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Old 04-29-2019, 09:11 AM
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I changed the mid section on my 5.0 XKR recently. Couldn't resist the temptation to start the car and rev it a little while there was nothing attached after the catalysts - well the neighbours were all out so why not?

It was *brutal* loud. No way I could drive around that loud all the time, and that was just idling and a little revving in P so no actual load on the engine - can only imagine what it would have sounded like under real load at WOT.
 
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Old 04-29-2019, 10:45 AM
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I too did it and there wasn't much tone difference from cat less down pipes to no muffler. It just got a little quieter the further from the engine. It was not a good sound...
 
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Old 05-30-2019, 12:24 PM
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Point of no return!


As they came with remotes it was easy wiring!:-)


Had a local guy who welded them on, they came a little to far down then what I wanted cause I told the welder there was not much room above. After cutting the holes I should have put the exhaust back on and rechecked before welding. A little out of line they are but nobody see's that more then me and the MOT guy!:-D



Started the car with valves closed and opened them when idle and the tone became alot lower, sounded really nice. Revved it a little and it is loud.:-D
Will do some pipework later on when I've tested it a little more so the exhaust fumes don't get into the car.
Will do a video when the weather gets better. Should it be to loud and or bad tone I will just put a cover plate on and no harm done!:-)
 
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Old 05-30-2019, 12:29 PM
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BTW, cause of the heat when welding the pipes moved sideways, about half an inch!
Thought I was cooked but after a cup of coffee and thinking I used a strap like this.....





and could get them aligned and on.:-)
 

Last edited by peterv8; 05-30-2019 at 12:32 PM.
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Old 05-30-2019, 02:41 PM
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Yeah, the ratchet strap method will work OK. You'll need to go a little overcenter so they are the correct width once they relax. Hopefully they only need tweaked together and aren't twisted.
 
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Old 05-31-2019, 06:35 PM
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I've no rear box and paramount straight through section as seen here:

https://www.ebay.co.uk/i/183074898783

Mine sounds exactly like the exhaust in the clip when the valves open, but ALL the time

Still no where near as loud as my X100 with straight through pipes and just two torpedo silencers behind the quads
 
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Old 06-09-2019, 11:50 AM
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Finally got a video and I'm very happy with the sound. Was afraid it would be to loud but it sounds great! :-)


I noticed in the video my rear lights flicker but checked when I got home and they were fine so hope it's my camera as I've seen before that leds can flicker on cameras
 

Last edited by peterv8; 06-09-2019 at 12:05 PM.
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Old 06-09-2019, 03:14 PM
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Frequency modulation of LEDs on video frame rates. Somewhat like how wheels and such appear to go backwards on TV and in movies.
 
 
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