Exhaust and Noise

Will Caradoc-Hodgkins · Post by **Will Caradoc-Hodgkins** » Tue Jan 20, 2009 9:34 am

Hello
Does any one out there know of a way of making my V12 sound like a V12.

I got all excited when looking at the AJ6 Engineering exhausts when I saw that they had a pipe for removing the central boxes but on enquiry i'm told they only do this for saloons and XJS's...pity. I don't want to spend another ?900 plus fitting for a new sports exhaust as my system is quite new.

Has anyone removed the central boxes and if so just how loud is it as I am sure I could find someone to make up a pipe for where the boxes were.

Anyone out there with any experience on this issue ?

Will

Post by **Heuer** » Tue Jan 20, 2009 10:51 am

Will

Removing the boxes will probably result in a drop in power as they are part of the overall engine design. You will need a complete 'big bore' system to make a significant change to the sound but a V12 system will set you back ?2,000+. Rob Beere sells them.

Will Caradoc-Hodgkins · Post by **Will Caradoc-Hodgkins** » Tue Jan 20, 2009 11:31 am

Harry
Thanks for that.

If you look up the AJ6 Engineering site they do two exhaust systems for V12 E Type at ?825 and ?899 which looks like great value.

See
http://www.jagweb.com/aj6eng/exhaust1.php

Cheers
Will

hastylane · Post by **hastylane** » Tue Jan 20, 2009 8:02 pm

Will,

My V12 sounded flat when I first had it and I never knew why until I removed the cylinder heads to sort out a cracked head. When I put it back together I noticed the cam timing was out so I adjusted it and when was fired up it sounded like a proper V12. I was convinced the flatness was down to the exhaust, but not so. You could check the cam timing 'relatively' easily. I presume that you are missing the lovely wail of a V12!

Regards Andrew

Will Caradoc-Hodgkins · Post by **Will Caradoc-Hodgkins** » Tue Jan 20, 2009 8:49 pm

Harry
thanks for the response.....
Yep would be nice to have a V12 that sounded like a V12, OK not a flat crank sound like a Ferrari but still something to sound like she has a few cylinders.
My old Maserati, Kyalami 4.9 V8, has a sound to die for sio why noy my V12.
I'm about to fit the SNG Barrett Opus Ignition Conversion Kit so will be sorting out the timing as part of this.
As for cam timing this is not something I have thought about and assume that this is OK given my engine,65,000 miles believed genuine, isnt ratling with a streched timing chain.
She starts on the button, except from cold when she needs a bit of cranking given the shit induction system.
Am I missing some thing here?
Will

iain6566 · Post by **iain6566** » Wed Apr 22, 2009 4:20 pm

Will,

I recently bought an E-Type S3 which seems to have had the central boxes removed. Apart from hanging a bit low (the previous owner neglected to put any kind of hanger in place - something on the list of things to "improve") I can honestly say it is one of the best sounds I have heard from any type of engine. But boy is it loud!! If you are in the cabin and it is slow idling it changes the pitch of your voice!! Still, never fails to put a smile on my face anyway! And EVERYONE comments on it (isn't that why we own these things in the first place!)

Regards,

Iain.

Aldeburgh · Post by **Aldeburgh** » Thu Jun 04, 2009 8:54 am

I am about to have an AJ6 exhaust fitted to my series 3. They produce 2: the 'torque extraxtor' and the 'super sport'. I have opted for the former as the super sport is said to be pretty loud... not for the faint-hearted is how they put it.

I am told the result will be a crisper sound, slightly more akin to a ferrari but still definitely a Jag.

Let me know if you want to sample the effect and I will pop over your way... I am not far from you

Will Caradoc-Hodgkins · Post by **Will Caradoc-Hodgkins** » Sun Jun 28, 2009 3:35 pm

Aldburgh
Thanks for the offer to hear your car...has the system been fitted yet?

Aldeburgh · Post by **Aldeburgh** » Fri Jul 03, 2009 5:23 pm

Will probably collect around end next week. Delays, natch.

Aldeburgh · Post by **Aldeburgh** » Fri Aug 14, 2009 6:09 am

Will, I have been running in my V12 post engine rebuild. AJ6 twin tube 'torque extractor' exhaust fitted (...with some difficulty evidently) by Harry at e-type UK. I have to say that the sound is glorious and stops people dead in their tracks.

I am like a schoolboy whenever I am alongside a wall or in a tunnel.... Am about to have 1000 mls oil-change and head retorqued down after engine open heart surgery. Once completed I will be able to rev to more than 3000 for the first time. At 3000 rpm it is just starting to sing and I cant wait to hear it at 4000...

As a matter of interest Harry has had the more extreme version fitted to one of his cars ... AJ6 call it the super sport. I listened to that one and much prefer mine. Harry's is wonderful but out of character with the car imho.

uhessel · Post by **uhessel** » Sat Nov 14, 2009 12:39 pm

Who would like to share his experience of the AJ6 exhaust TT Extractor System with me ?

* is the sound acceptable for driving in an OTS ?
* how would you decribe the sound compared to the standard exhaust ?
* how feels the mid-range torque boost ?

May be that anyone has prepared an audio file of his cars' noise ?

Regards,
Ulrich

Aldeburgh · Post by **Aldeburgh** » Tue Nov 17, 2009 1:18 pm

I would record it but I dont think my cellphone would do it justice, I'm afraid.

I would have no qualms fitting it to an OTS.... in fact I generally drive with the windows and sunroof open in my 2+2 so I can get the benefit.

The note is crisper, less inhibited. There is a fantastic burble at idle which builds through a snarling wail to a full symphony either side of 3000 revs. Much more than 4000 and the best results are for spectators as there is so much going on inside the car you cant separate the exhaust from the rest...! I had it fitted as I found the stock system too discreet for such a dramatic car.

I am delighted with the result but my motive was an accoustic rather than a performance upgrade. Anyway; any mid-range torque increase is tough to judge as my engine was rebuilt at the same time as the new exhaust was fitted so one would expect some increase in any case.... I will say that it feels brisk enough though.

marsh · Post by **marsh** » Thu Jan 07, 2010 10:48 pm

The AJ6 exhausts look to be a very tempting proposition.

Do they offer a fitting service? If they don't how much should one budget for getting one fitted?

Regards

Marsh

Woolfi · Post by **Woolfi** » Thu Jan 28, 2010 6:35 pm

Hello Will
"Anyone out there with any experience on this issue ? "
I am from Germany and you have to excuse my poor english.
I think I have some experience with "upgrading" the original sound of a EV12.
In Germany we say: a real sportscar must: 1. accelerate very good, 2. the chrome must shine, 3. the leather must smell and 4. the exhaust must roar. Since I was 15 years old and I had my first mtorcycle, I liked to "upgrade" the sound.
You can do this by two ways: With a legal sport-exhaust or with a good sounding sport-exhaust. Nothing between.
A good sounding exhaust you can also do by two ways: spending a lot of money or doing minor changes at the original exhaust. Holes are cheap, but they must be in the correct position.
Eight years ago we dismounted the last muffler of the exhaust system of my EV21 OTS and checked the sound. The changing was minor. Then we dismounted also the two front mufflers. When idling the sound was great, but superloud when reving.
Then we made two big holes inside the two front mufflers, done with a long sharp big "iron". We put the iron from the back side of the mufflers inside and with some hits with big hammer we cut a hole of roudabout 3 - 4 cm in every muffler (inside) . There is a "iron wall" inside the muffler, which separates it into two chambers and forces the exhaust gases to move a long way and to "delete" a part of the sound pulses. A clever constructed muffler separates the exhaust gases into two "lines" and mixes the gas streams later in the muffler again. Pulses with positiv and negativ pressure "meet" and this eliminates the pulses to a more constant flow. Noise is pulsation of air.
After we mounted the two front mufflers to the car, the sound without the back muffler was much "bigger", deaper and louder, like an angry 'tyanusaurus rex'. After mounting the single back muffler, the sound was like original, but a bit "sharper" and louder. Maybe this will be the sound, you would like to have. It is cheap und done in 2 -4 hours at a saturday afternoon. The biggest problem was to remove the mufflers, because of rusted pipe connections. "Showering" with WD40 some hours before, will help to disconnect the pipes.
Try this changing and listen to the "music". If you like it , you can stop. If not, there is another simple chaning, I will explain in my next posting.
Can somebody explain to me, how to put pictures ? I am new in this forum.
Kind regards Wolfgang Gatza

Phil · Post by **Phil** » Thu Jan 28, 2010 7:52 pm

hello Wolfgang

welcome ! and thanks for sharing your experience.
David created a post to explain how to put pictures : here it is

http://etypeuk.com/forum/viewtopic.php?t=886

look forward to see photos

best regards

Woolfi · Post by **Woolfi** » Fri Jan 29, 2010 1:33 am

On the picture below you can see, how we have worked on the two front mufflers. This looks simple, but is effective to get a better sound. I am the laughing guy on the left side.
If somebody is anxious to get a to loud exhaust noise, he can start with a small hole of 1 cm, mount the two front mufflers and the back muffler and check the sound. I think that the change of the sound with this small hole is much to less.
You dismount the mufflers, make this hole bigger , mount all mufflers und hear again.
I think, that a hole of up to 5 cm ist a good step towards a good sporty sound of the EV12.
The "style" of the typical EV12-sound is not changing. It is becomming a bit louder und a bit "sharper". Let's say is will become a good gentlemans-sound.
2. If you haven't reached a gentleman in life and you still are a "bad boy", there are other easy-to-do changes of the front mufflers, which increase the "sportiness" of the sound.
When you have dismounted the two front mufflers und you look inside from the back, you can see a typical exhaust-pipe with a lot of holes. In german language we call this "Lochblech". This "holes-pipe" is leading through a chamber of the muffler, full of glass-wool. I have "cut" some long wholes into this pipe with a sharp long iron (in german language we call it "Meissel") and have "fiddled" out this wool with a long hook. This takes time, but is easy done.
After you have mounted all three mufflers , the sound will become "sharper" with more "hizz". This wool in a silencer normaly takes out the high frequencies of the sound. The sound will not be much louder, but becomes more "agressive".
3. Stage three of the sound changing can be this: you to take away the back muffler und mount two long pipes instead. I have done this on my car, bedause I like the clean look of two stainless steel pipes without the back chrome "table". Check the oicture of the car. With this changing the "style " of the cars sound changes a lot. My end-pipes now are thicker and have a diameter of 62 mm. Because of this the sound is much deaper and not anymore the typical V12-singing. The car sounds like a real sports-car, but I started to miss the typical V12 sound. Check the pictures of the car with this exhaust-system.
4. If you spend one saturday afternoon working on the exhaust, you can make the first two steps of the changing. I think the result will satisfy 80% of which are interessted in a more "sporty" sound.
5. There is another simple change. A friend took out both original front mufflers and put inside two "glass-pack"-mufflers. This changes the style of the typical EV12-sound. Some will like this sound.
6. Another friend mounted the supersports exhaust-system from AJ6. He and I have not been happy with the (expensive) result. The car was becomming really loud. To reduce this, he add two glasspack-mufflers to each "pipeline". The car is now less loud. If you are driving through all "rev-areas" the "loudness" is changing, with some loud peaks. I don't like this.
7. If you take out the two front mufflers the sound will "eat your ears". The car is becomming MUCH to loud, because the front muffler are doing the "main" work of silencing and the back muffler is doing more a sound-change than a reducing. In a XJS this is different, because the two back mufflers are also doing a lot of silencing. A friend of me has the biggest EV12 garage in Germany. I have heard a lot of differnt exhaust systems in his company.
I hope you can understand all this, descibed in my simple school-english and I hope you are motivated to start this work before spring is comming. Everybody who is doing some of this changing, should describe his results here in the forum, to help others, which are interesstet in sound-changes. For the US-market the V12 was softened compared to the 3,8. I like to "re-sport" the car.
Kind regards Wolfgang Gatza

christopher storey · Post by **christopher storey** » Fri Jan 29, 2010 11:07 am

Woolfi : those pipes might be alright in Germany with your splendidly smooth roads. With that little ground clearance in the UK they will be constantly scraping on the road!

Woolfi · Post by **Woolfi** » Fri Jan 29, 2010 11:37 am

These pipes are "taylor made" in stainless steel by a company, which is producing pipelines for the chemistry industry. I gave them a draw, one day later these two perfect bendet pipes have been ready. The ankle of the main bending is a little bit to wide, because my draw was not correct. Therefore the pipes are a little bit to much down at the lowest point under the cage of the axle.
I will dismount them this year and have to "change" the ankle a little bit. After the pipes will have exatly the same position like the original pipes. These pipes are made of stainless steel with a wall thickness of 2 mm. Price for two was only 90 pound. They are nearly undestroyable. Sometimes when driving they touched the street. You can see only minor scratches on the steel.
I have mounted these pipes because of the elegant clean look and also the different sound. For a good sportscar-sound you don't need them, like I explained before.
Kind regards Wolfgang Gatza

42south · Post by **42south** » Thu Sep 06, 2012 12:21 am

+1 to Woolfi

around 15 years ago when I got my S3, I too wanted a good sound.
I wound up with pretty much the exact exhaust set up that he has.
However instead of holing the original mufflers I replaced mine with much smaller round sausage like mufflers.
On several trips in convoy with a couple of S2 and an XK140 the owners reckoned that the sound whilst following my car was fantastic.
Yes its loud but not intolerable, symphonic bliss.
One of the best mods I ever made.

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The 'E' Type Forum

Exhaust and Noise

#1 Exhaust and Noise

#2

#3 Exhaust and Noise

#4

#5 Exhaust and Noise

#6

#7 Exhaust

#8 Exhaust

#9 Sound

#10 ... making my V12 sound like a V12...

#11 exhaust and noise

#12 Who would like to share his experience of the AJ6 exhaust TT

#13 V12 Exhaust

#14

#15

#16

#17

#18

#19 exhaust pipe noise