XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

X-pipe puzzle.

 
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Old 05-28-2019, 05:06 PM
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Default X-pipe puzzle.

I have a puzzle I canít solve. I want to place a x-pipe way up front on my XJS. Only spot available seems to be between bellhousing and trans pan. Iíve located a x-pipe that could fit the available space, and enter and exit between housing and tranny. Ceramic coated to avoid cooking anything. And, yes, I am thinking of running this pipe sideways. As shown below the two upper connections would be inputs. Not a normal installation.




But, My primary purpose is to render a V-12 note, and this pipe has a wide merge area, and not a true x. Ideally Iíd have a single 2.5Ē pipe between two Ys. No room for that under this car.

Anyone here with X-pipe installed? Anyone with opinions as to the effectiveness of a large merger area vs a single tube? Any info or informed opinions would be appreciated!
 
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Old 05-28-2019, 06:08 PM
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Yes I do. Can post pics in the next couple of days
 
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Old 05-28-2019, 06:46 PM
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Old 05-28-2019, 10:43 PM
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Other thing that works is a simple pipe the bridges the two pipes just in front of the IRS. More of an H configuration.
 
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Old 05-29-2019, 03:30 AM
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Firstly why do you want an X pipe.

Jaguar used an X pipe on the E Type but it was only to tune exhaust note. Unlike a 90į V8 crank the V12 has even pulses and will not benefit from an X pipe
 
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Old 05-29-2019, 05:20 AM
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The only purpose for this x-pipe is sound.

I want dual exhausts with a V12 tempo. Not two sixes side by side.

The reason for the awkward desire to put this x up front is because Iím planning dual side pipes. There is no simpler exhaust setup than sidepipes, unless you want to join the two sides before they dump. This makes it weird.

Single side pipe works. But is not the look I want. So here I am trying to not loop the exhaust down and back again just to join the two banks.

2 1/2 inch pipes from down pipe on with 3Ē muffled core 60Ē pipes. Split between the two pipes decibels should be very reasonably calm at idle, but throaty. Higher RPMs should be glorious.

At at least thatís the plan.
 
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Old 05-29-2019, 07:06 AM
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I have mine just aft of the transmission. I have a Series III sedan but, from memory, I think the underbody layout is the same on on XJS





Cheers
DD
 
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Old 05-29-2019, 07:24 PM
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I have done mine predominantly for sound also and have a similar set up top Doug's.
 
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Old 05-29-2019, 08:54 PM
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Thatís the practical way to do it.

Doug, do you have any ground clearance issues with this setup? What diameter are those pipes?

I donít have to do sidepipes. But I will if I can sort this detail. I donít want them if I have to have them separate.
 
 
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