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DISCO3.CO.UK > Maintenance & Mods (D3)

It's all too exhausting...
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LeighW
D3 Decade 


Member Since: 31 Jan 2006
Location: Brisbane, AUS
Posts: 920

Australia 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3
It's all too exhausting...

I have some questions regarding the removal of the front muffler in case any other forumites have done it.

Some time back Disco_Mikey had a couple of images of one that may have passed through his workshop. I tried to PM both Mike (and Martin to see if the problem was at my end) but for some reason the Outbox is not clearing and neither has responded).

So, the questions are;

1. Is it much noisier (for instance, does it drone at any speed)?

2. Would the back pressure be lowered and possibly have any effect on the engine? (Currently at 280 000 km; the body, not the 3rd engine)

3. If in the future I blank the EGRs would this have any effect on the engine (with or without the forward muffler)?

Thanks in advance LeighW

The old girl is on her third engine...
* first ran a bearing (design failure in original engine)
* second had a failure of the water outlet on top of the engine (pls check yours)  
Post #227503426th Jan 2022 6:34 am
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LeighW
D3 Decade 


Member Since: 31 Jan 2006
Location: Brisbane, AUS
Posts: 920

Australia 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Nobody has a deleted front muffler and/or could offer a comment? LeighW

The old girl is on her third engine...
* first ran a bearing (design failure in original engine)
* second had a failure of the water outlet on top of the engine (pls check yours)  
Post #227561129th Jan 2022 8:52 am
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Devon Z
 


Member Since: 14 Nov 2019
Location: Brixham Devon
Posts: 251

England 

I’m assuming you have a petrol? Check out YouTube there’s lots of videos from the US giving you idea of the noise level, it appears to be a popular mod over there so try a US based LR forum. Steve

*2005 RR Sport 2.7tdv6 HSE. Current project.
*98 Volvo V70R FWD, owned 14 years, future project.
*99 BMW Z3 30k miles owned from new.  
Post #227562329th Jan 2022 10:43 am
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LeighW
D3 Decade 


Member Since: 31 Jan 2006
Location: Brisbane, AUS
Posts: 920

Australia 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Thanks for your reply Devon Z.

I have a diesel 2.7 engine and was of the opinion that others in the UK had tried a pipe kit that replaced the front muffler. However I did not find out any comments on the change in noise (and/or resonance) that the change made. I do seem to recall a video from a South African forum contributor but can't find it now.

I don't think the petrol-engined mods will be relevant but thanks for the suggestions.

Cheers, Leigh LeighW

The old girl is on her third engine...
* first ran a bearing (design failure in original engine)
* second had a failure of the water outlet on top of the engine (pls check yours)  
Post #227582430th Jan 2022 3:12 am
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DaveT
 


Member Since: 01 Aug 2005
Location: Cornwall
Posts: 2578

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Indus SilverDiscovery 4

Dredging the far depths of memory ... try searching Griffin Exhaust Thumbs Up Long succession of Disco's since 2001...
SIII Lightweight - neglected & rusting. Bulkhead, A panels, vent panel & outriggers now disintegrated - Next years project!  
Post #227584030th Jan 2022 9:00 am
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LittleG
 


Member Since: 21 Sep 2013
Location: Wombourne
Posts: 392

United Kingdom 2005 Discovery 3 TDV6 SE Auto Cairns BlueDiscovery 3

You’ve a good memory DaveT. Thumbs Up
https://www.disco3.co.uk/forum/centre-sile...ht=Griffin  
Post #227584130th Jan 2022 9:14 am
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Devon Z
 


Member Since: 14 Nov 2019
Location: Brixham Devon
Posts: 251

England 

Hi Leigh,

Here’s some.






Ther are some others but they state they’ve taken the cat out as well and they are a bit noisy. Steve

*2005 RR Sport 2.7tdv6 HSE. Current project.
*98 Volvo V70R FWD, owned 14 years, future project.
*99 BMW Z3 30k miles owned from new.  
Post #227585830th Jan 2022 10:02 am
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Motolab
 


Member Since: 18 Oct 2019
Location: Sleen
Posts: 1820

Netherlands 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3
Re: It's all too exhausting...

LeighW wrote:


2. Would the back pressure be lowered


It is a 4 stroke….

Not a 2 stroke….

So no “Back pressure” effects, since 4 strokes don’t use that…

On a 4 stroke, only the diameter and length of the exhaust pipe (in total) have influence on the performance.
As long as you do not lengthen or shorten the total length… you be fine regarding that subject.. Best regards
Harold

Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year

Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. Wink  
Post #227588830th Jan 2022 12:36 pm
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LeighW
D3 Decade 


Member Since: 31 Jan 2006
Location: Brisbane, AUS
Posts: 920

Australia 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Thanks for all the replies. They are appreciated.

One of the videos seems to not have the rear mufflers visible and I assume the owner removed them as well. Unfortunately, I haven't found out any information about 'droning' at any speeds, so I may have to put it in the too hard basket.

Thanks again for the replies, videos and the link.

Thanks, also Motolab for the info about back pressure. LeighW

The old girl is on her third engine...
* first ran a bearing (design failure in original engine)
* second had a failure of the water outlet on top of the engine (pls check yours)  
Post #227608131st Jan 2022 12:59 am
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