Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Consumer Rights Act
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Official Porsche Centre Reviews
Model
Stock
Porsche 911
992 : 2019- 0
991 : 2011- 24
997 : 2004- 66
996 : 1997-2005 34
993 : 1993-1998 4
964 : 1989-1993 1
Carrera 3.2 : 1983-1989 2
Carrera SC : 1977-1983 2
930 Turbo : 1975-1989 1
Early 911 : 1964-1977 1
Porsche Other Models
Classic : 1950-1965 0
Boxster : 1997- 30
Cayman : 2005- 20
Cayenne : 2003- 7
Macan : 2014- 6
Panamera : 2009- 0
912-914-924-928-944-968 1
959 - CarreraGT - RaceCar 0
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [992] 2018-Current
Porsche 911 [992]
911 [991] 2011-2019
Porsche 911 [991]
911 [997] 2004-2012
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
mazza
Österreich


Joined: 06 May 2011
Posts: 963
Location: London


PostPosted: Thu Aug 25, 2011 10:23 pm    Post subject: Reply with quote

Awesome Herbs, as mentioned above you will no doubt be driving it quicker so be prepared to spend more on petrol! I got through half a tank on my journey back from Essex to West London, via the scenic routes!
_________________
996 Turbo 9e30
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Fri Aug 26, 2011 12:39 am    Post subject: Reply with quote

Listener wrote:
I've been following this thread for a while and am seriously tempted to get my exhaust modded, my only concern is what effect this will have on the resale value or getting an Indy to take it in P/X in a few years. Normally I never get anything "terminal" done to my cars but as far as I can see, once this has been done then that's it. Has anyone got any experience of either buying or selling a 996 with the oettle mod?


Go for it.

On trade-in one of two things will happen:

1) The dealer will be clueless about the mod and it won't make any difference.
2) The buyer (or dealer) will know people spend thousands on fitting an OEM PSE then removing the relay electronics or pulling the valve plugs to keep them on loud all the time and the most wanted effect (louder and more sporty exhaust) has already been fitted and will bite your hand off!
 
  
View user's profile Send private message
   
marktol
Newbie


Joined: 18 Jun 2011
Posts: 12



PostPosted: Sun Aug 28, 2011 2:02 pm    Post subject: Reply with quote

Herbs wrote:
Well I'm booked in tomorrow for the exhaust to be done Mr. Green I've gone for the pse1 mod with 1.5" pipe so should be a little louder than standard come tomorrow afternoon!!


Where abouts did you get this done? Did they know what it was you were asking for - something that's fairly normal for them to do etc?

Cheers
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Sun Aug 28, 2011 2:36 pm    Post subject: Reply with quote

Might be worth a call for those in or near Dorset:

http://www.marque21.co.uk

http://www.jmgarage.com
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Sun Aug 28, 2011 2:53 pm    Post subject: Reply with quote

When you've done you exhaust mod, don't forget to mod your HHR too!

http://www.911uk.com/viewtopic.php?t=60295
 
  
View user's profile Send private message
   
Herbs
Newbie


Joined: 22 Aug 2011
Posts: 7



PostPosted: Mon Aug 29, 2011 9:38 am    Post subject: Reply with quote

marktol wrote:
Herbs wrote:
Well I'm booked in tomorrow for the exhaust to be done Mr. Green I've gone for the pse1 mod with 1.5" pipe so should be a little louder than standard come tomorrow afternoon!!


Where abouts did you get this done? Did they know what it was you were asking for - something that's fairly normal for them to do etc?

Cheers


I found a classic car restorer called Trickett Welding based in Holton Heath near Wareham who did it the following day. The bonus was they installed it and welded it in situ as the nuts were buggered rather than risk taking them off and causing a problem with me picking it up the same day.

I did approach JM but never returned my calls or emails until a week later which was no good.

thoroughly reccomend Tricketts.
 
  
View user's profile Send private message
   
lukewooster
Silverstone


Joined: 16 Sep 2011
Posts: 119



PostPosted: Sun Oct 02, 2011 7:19 am    Post subject: Reply with quote

Hello chaps.

This mod is definitely on my list - although my other half has a bit of an issue with it....

All I need is exhaust shop in West Sussex area who would do the mod...

Any ideas????? Question
 
  
View user's profile Send private message
   
mikegr
Nürburgring


Joined: 17 Aug 2011
Posts: 410
Location: Athens, GR


PostPosted: Thu Oct 27, 2011 11:50 am    Post subject: Reply with quote

Are stock mufflers made of steel?
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Thu Oct 27, 2011 3:31 pm    Post subject: Reply with quote

Stainless steel
 
  
View user's profile Send private message
   
SoliD
Silverstone


Joined: 23 Aug 2010
Posts: 147
Location: Fareham, Hampshire


PostPosted: Tue Dec 13, 2011 8:04 pm    Post subject: Reply with quote

GT4 or others, does anyone have any recommendations on who can do this in the Hampshire region?

Thanks.
_________________
2003 996 Targa
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Fri Dec 30, 2011 11:43 am    Post subject: Some 997 coverage too Reply with quote

997 PSE PERMANENT ON MOD

I know this is not the 997 FAQs, but the PSE-clones are universal.

So just for for completeness (and the fact they don't have the diode cut option):

The Brown (or black or orange or even cream Confused) plug mod.

Just like the relay-pull or diode cut, it doesn't make it louder, per se, just on all the time (sans drive-by quiet mode). Unlike the diode cut, it won't allow you to continue to use thee cockpit control button.

On the RHS - top corner - as in the 2 o' clock position in the engine bay, find this brown plug (socket is mounted on a metal bracket) and pressing the release clip, pull it (plug may have been changed to black or other on later models):



Ideally you should now seal the two open ends (plug and socket). So wrap in a bag, clingfilm, small balloon etc and cable tie as required to prevent moisture ingress. You may need to cable tie the loose plug so it doesn't move around too much and interfere in the mechanicals.

Obviously with no control signals going to PSE actuator the PSE dash button will not work now.

Also, make sure the PSE is actually on when you pull the plug.

Do not mod using the vacuum pipe method, as the vacuum system is used by other services and may affect their operation.
 
  
View user's profile Send private message
   
TwinT
Spa-Francorchamps


Joined: 11 Mar 2008
Posts: 322
Location: Surrey


PostPosted: Fri Dec 30, 2011 5:22 pm    Post subject: Reply with quote

Great information!

Im confused what diameter bypass to go for.

Does this mod really sound this good?

http://www.youtube.com/watch?v=3jaDBhmGNC0

if not I may just save the money and find a PSE.

thanks

Lee
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Fri Dec 30, 2011 6:40 pm    Post subject: Reply with quote

The 1" bridge mod on the 3.4 = PSE
The 2.25" nipple mod on the 3.6 = PSE

That is what they are from the factory (with or without valving dependent on the age, or if retrofit, dependent on if the owner paid for the exhaust+valving or just exhaust).

The caveat is almost no one does the nipple bypass.

So for a 3.6 with a bridge bypass you are creating something non-OEM, which means there appears to be no absolute bypass size.

Some say you need 1.5", others 1.75", others that 1" is OK.

Unless you have a comparison on the same YouTube clip (and even then the sound sounds like your speakers!), you have no hope of comparing mods "at a distance".

That particular clip has a very bassy, very loud sounding exhaust (and I am not saying that's not what a/his bypass sounds LIKE, but the background hum/whine/engine sounds are very loud too - too loud from my speakers - ie if those levels are off, are the exhaust sounds too?)
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Sat Dec 31, 2011 12:13 pm    Post subject: Reply with quote

Not a 996 either, but still worth a listen:


Open Youtube Page




Quote:
The automotive engineer's vocabulary is typically broad and precise, which makes it intriguing to hear the word "emotion" used increasingly when new technologies are introduced. In the case of Porsche's new 911, emotion was cited by engineers as a key factor in developing the car's acoustic signature.

"Sound was a major design and engineering focus," explained Wolfgang Hatz, Porsche's Main Board Member for Research and Development, who also heads VW Group's powertrain development.

At a recent technology workshop for the 2012 Carrera and Carrera S, Hatz and other Porsche engineers noted that creating a unique sound quality "between the engine and the tailpipe" has been a leading criterion for the 911 ever since the iconic sports car's 1963 debut. For the new Type 991 series the development team focused on “mechanical engine sounds characterized by high frequencies with tonal elements” together with low-frequency intake noises.

So significant is the 2012 car’s symphony as deemed by Porsche that the interplay between induction and exhaust was part of the car's design and engineering specification. Computer modeling mapping, as well as analysis of the configuration and dimensions of manifolds, pipework, catalytic converters, and mufflers, was carried out at the company’s Weissach Development Center.

The required sonic profile had to satisfy all possible operating states—from engine starting and idling (conveying power without disturbing the neighbors) to wide-open throttle on a racetrack. The goal was not only to deliver the aural “emotions” expected of a 911 but also to provide the driver with feedback about the car’s mechanical status while meeting Europe's 74 dB(A) drive-by noise requirements.

Electronically synthesized noise is not a Porsche solution, so the engineers developed a new Sound Symposer that is standard on both versions of the car. An acoustic channel picks up intake vibrations between the throttle valve and air filter and a membrane incorporated in the channel reinforces the vibrations and transmits them as an engine sound into the cabin. The system is driver activated or deactivated via a “Sport” button that controls a valve ahead of the membrane.

The result is a direct acoustic link between the cabin occupants and the engine, providing optimal transmission of the load-dependent sounds. The sound of gearshifts can also be enhanced.

The Sound Symposer incorporates a tunable Helmholtz resonator to achieve an harmonious sound pattern, damping out unpleasant noise occurring at around 5000 rpm.

If the Sound Symposer is deactivated, an aperture in the air filter housing still allows the basic engine and exhaust tones to be heard—"because we don’t want it to sound boring!” explained Dr. Bernhard Pfäfflin, General Manager of the Noise and Vibration Department.
 
  
View user's profile Send private message
   
TwinT
Spa-Francorchamps


Joined: 11 Mar 2008
Posts: 322
Location: Surrey


PostPosted: Tue Jan 03, 2012 9:12 pm    Post subject: Reply with quote

Thanks for the info GT4.

Just had the 2.25" Nipple mod completed.

Much better but I dont think as nice as a 2004 PSE car that I have heard.

I will try and get a video of each.

If I can buy a PSE at a resonable price I will.

Cheers

Lee

GT4 wrote:
The 1" bridge mod on the 3.4 = PSE
The 2.25" nipple mod on the 3.6 = PSE

That is what they are from the factory (with or without valving dependent on the age, or if retrofit, dependent on if the owner paid for the exhaust+valving or just exhaust).

The caveat is almost no one does the nipple bypass.

So for a 3.6 with a bridge bypass you are creating something non-OEM, which means there appears to be no absolute bypass size.

Some say you need 1.5", others 1.75", others that 1" is OK.

Unless you have a comparison on the same YouTube clip (and even then the sound sounds like your speakers!), you have no hope of comparing mods "at a distance".

That particular clip has a very bassy, very loud sounding exhaust (and I am not saying that's not what a/his bypass sounds LIKE, but the background hum/whine/engine sounds are very loud too - too loud from my speakers - ie if those levels are off, are the exhaust sounds too?)
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Tue Jan 03, 2012 10:23 pm    Post subject: Reply with quote

They "bed" in over time.

If you have the same size and location of pipework (assuming thickness and materials) then you get the same sound (otherwise all trumpets would sound different).
 
  
View user's profile Send private message
   
TwinT
Spa-Francorchamps


Joined: 11 Mar 2008
Posts: 322
Location: Surrey


PostPosted: Tue Jan 03, 2012 10:31 pm    Post subject: Reply with quote

GT4 wrote:
They "bed" in over time.

If you have the same size and location of pipework (assuming thickness and materials) then you get the same sound (otherwise all trumpets would sound different).


Cheers.

Makes sense. It seemed to sound different the second time I drove the car.

Will report back!
 
  
View user's profile Send private message
   
GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Sun Jan 08, 2012 10:42 pm    Post subject: Reply with quote

You'll like this, PSE operation.

Technically a 997 GT3, so actuator and valve placement is different, but then you wouldn't be able to see it otherwise!

Same principle, though.


Open Youtube Page
 
  
View user's profile Send private message
   
HoocH
Trainee


Joined: 14 Nov 2011
Posts: 56



PostPosted: Mon Jan 09, 2012 8:55 pm    Post subject: Reply with quote

I like the idea of the diode cut. Think ill be doing that this weekend.

thanks GT4
 
  
View user's profile Send private message
   
TwinT
Spa-Francorchamps


Joined: 11 Mar 2008
Posts: 322
Location: Surrey


PostPosted: Wed Jan 11, 2012 8:57 pm    Post subject: Reply with quote

For anyone that is interested I now have a PSE after using an exhaust with a bypass mod (2.25 Nipple)

The difference is quite large.

PSE is mush louder and a deeper crisper note.

Im so happy with it now!
 
  
View user's profile Send private message
   
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 12 Hours
Goto page Previous  1, 2, 3, 4  Next
Page 2 of 4

 
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
You cannot post calendar events in this forum