Throatier exhaust 95 4.0 xjs
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When I had a V12 XJS I (like umpteen others) experimented with different mufflers in an effort to get the right sound.
I ended up using chambered straight thru mufflers as shown here:
Chambered Mufflers, Power Sticks, Cobra Mufflers
I didn't use the particular brand/vendor shown in the link but used the same type of muffler from another manufacturer....Walker, perhaps.
Anyhow, I had already ditched the front mufflers and used the chambered muffler to replace the factory rear mufflers/resonators. Overall I was happy with the result.....nice growl, no drone. A little odd sounding, though.
Frankly, straight 6s with low restriction exhuast tend to sound a bit odd as well....at least to my ears. You might wanna listen to some YouTube videos of straight six engines to get an ieda for what you might be in for. Might save you some expensive experimenting.
If you hit paydirt with a good sound let us know. I've been hesitant to make any exhaust changes on my XJR because I'm not confident of getting a good tone.
Cheers
DD
I ended up using chambered straight thru mufflers as shown here:
Chambered Mufflers, Power Sticks, Cobra Mufflers
I didn't use the particular brand/vendor shown in the link but used the same type of muffler from another manufacturer....Walker, perhaps.
Anyhow, I had already ditched the front mufflers and used the chambered muffler to replace the factory rear mufflers/resonators. Overall I was happy with the result.....nice growl, no drone. A little odd sounding, though.
Frankly, straight 6s with low restriction exhuast tend to sound a bit odd as well....at least to my ears. You might wanna listen to some YouTube videos of straight six engines to get an ieda for what you might be in for. Might save you some expensive experimenting.
If you hit paydirt with a good sound let us know. I've been hesitant to make any exhaust changes on my XJR because I'm not confident of getting a good tone.
Cheers
DD
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Oh-my-god, I wonder how many TR6s were sold on exhaust sound alone ? :-)
Car makers have a much bigger budget to tune the exhaust for the right sound....plus there's some science involved with firing orders, single vs. split exhaust manifolds, true dual exhuast vs. quasi-dual exhuast, etc.
Cheers
DD
#7
Oh-my-god, I wonder how many TR6s were sold on exhaust sound alone ? :-)
Car makers have a much bigger budget to tune the exhaust for the right sound....plus there's some science involved with firing orders, single vs. split exhaust manifolds, true dual exhuast vs. quasi-dual exhuast, etc.
Cheers
DD
Car makers have a much bigger budget to tune the exhaust for the right sound....plus there's some science involved with firing orders, single vs. split exhaust manifolds, true dual exhuast vs. quasi-dual exhuast, etc.
Cheers
DD
The trick is to get one up on a hoist and map out the components and the lengths between components. Count the cat as a resonator.
Take the case of the V8's. There are a number of cars with great sounding exhausts from the factory. Some Aston's, Mustangs, and Audi's. If you look at them, they have certain characteristics in common. It would make sense then, that copying those traits would be a good idea.
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If you look at a typical V12, front engine Ferrari, the exhaust on each side is a set of duals.
Not a great picture, but this is a 275 GTB. The front three cylinders and the rear three cylinders on each bank feed their own branch. The mufflers are just perforated resonators. The pipes are relatively small, but that maintains velocity and increases the pitch and timbre of the exhaust note.
Not a great picture, but this is a 275 GTB. The front three cylinders and the rear three cylinders on each bank feed their own branch. The mufflers are just perforated resonators. The pipes are relatively small, but that maintains velocity and increases the pitch and timbre of the exhaust note.
Last edited by MustangSix; 06-20-2012 at 10:05 AM.
#12
On a 4.0 XJS, I would try to duplicate the layout of an XKE or early Aston Martin inline six. Basically, the front three cylinders and the rear three would each feed separate pipes, 2" in diameter. Two perforated glass packs on each of the branches, no crossover or x-pipe needed.
Early XKE's sound amazing, esp at higher rpm.
Early XKE's sound amazing, esp at higher rpm.
#13
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Lots of guys like the V8 swaps. Others...not so much. It was/is a popular choice among those having a dead V12 ....too expensive to repair but not wanting to throw the whole car away.
The 4.0 six cylinder seldom give trouble so I reckon very few are replaced with a V8.
Nowadays the price of early XK8s is low enough that those wanting a V8 Jag might be tempted to go that route and save themselves the work :-)
Cheers
DD
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1978 XJS roadster,5" side pipe exhaust
at 4500-7000rpm it does wail, full throttle. hey, its 12 cylinders firing ,not lowly V8, at same RPM.
idles like a top fuel dragster, blubbity,blubbity. lot of CAM overlap.
and it doesnt drone at hi-way speeds.
2 1/2 " down pipes, left crosses under flywheel area, joins into two Cherry bombs, all blended into a 5" turn down tip,flat blacked,Yeah, its loud.
idles like a top fuel dragster, blubbity,blubbity. lot of CAM overlap.
and it doesnt drone at hi-way speeds.
2 1/2 " down pipes, left crosses under flywheel area, joins into two Cherry bombs, all blended into a 5" turn down tip,flat blacked,Yeah, its loud.
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