Removing Centre Silencer





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  1. #1
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    Question Removing Centre Silencer

    I am looking at options to improve the performance of my 2004 Disco Td5. Thinking of going the "remove the centre silencer" route before looking at chipping. For those who have removed the silencer:
    1. How much of a performance increase did you experience?
    2. How much of a sound effect is there? Wife would kill me if she had to drive round in a tractor!

    Thanks
    Basil Peetz
    2014 Jeep Grand Cherokee 3.6 Overland
    2013 Triumph Tiger 800 XC

  2. #2
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    Hi Basil,
    I did mine a long time ago, and the LROC had a technical day afterwards at SAC in Centurion where a member had a dyno run before and after the removal. Not quite sure where the I filed the results, (but can get it from the member if you want).
    Major difference: much smoother power delivery-more of a linear curve.
    Soundwise you can hardly hear it, unless you're standing right next to exhaust while idling.
    Hope this helps
    Regards
    PS: let me know what you think afterwards
    LROC PRO
    Defender TD5
    Previous: '82 RR
    Series III R6

  3. #3
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    I had the centre silencer removed on my D2. It has a slight increase in sound. Biggest improvement was at low revs. Lag as noticeably less.
    Deon Viljoen
    Boyscout

    2012 Land Rover Defender 90 2.2 Tdci S/W Sold
    2005 D2 XS TD5 Auto sold at 189000km
    2003 D2 GS TD5 Auto sold at 165000km
    1999 D2 GS V8 Auto sold at 178000km

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    CAn you do this on the V8 as well?

  5. #5
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    i must disagree with Boyscout and Defender ou unfortunately

    i removed the silencer on my 2004 Disco TD5 auto and the only increase was that of NOISE - swambo complained and it was even way too noisy for me inside the cabin.
    i don't have any figures to prove performance changes but nothing drastic - i could feel a little(very little) less lag but eventually got fed-up with the loudness and had a silencer put in.
    if your silencer is shot then try this - remove it and replace with a pipe(cost will be minimal for a short piece of pipe) and test it for a week or so to see if you can feel an improvement and can live with the increase in sound, if you're not happy with it then take it back and install a silencer......worst case you've maybe wasted R100 on the pipe. alternatively if your silencer is still fine ask them to remove it in such a way you can replace it later if you wish8)

    m2cw
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    Bush Lapa Miskruier

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    Hi Guys
    The Disco motor has different ratios and the auto makes it worse (lag).What we found is that if you buy the genuine LR airfilter for the D2 it makes a difference re the lag. Also keep a spare. the position of the intake of the D2 is right where the dust is really bad.
    The Defender TD5 responds dramatically. My 2c's worth
    regards
    LROC PRO
    Defender TD5
    Previous: '82 RR
    Series III R6

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    It's worked perfectly on my V8,I've only got a Cowley centre box,it then exits out of twin pipes,proper sound now at low speeds,I can hardly hear it doing 120,busy converting the air filter to take a snorkel,so I'll wait to put it on a rolling road and tune it properly.
    A legend in his own mind

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    Quote Originally Posted by Defender ou View Post
    Hi Guys
    The Disco motor has different ratios and the auto makes it worse (lag).What we found is that if you buy the genuine LR airfilter for the D2 it makes a difference re the lag. Also keep a spare. the position of the intake of the D2 is right where the dust is really bad.
    The Defender TD5 responds dramatically. My 2c's worth
    regards
    Seems to be interesting : are you saying that the Defender reacts more favorably than the Discovery to a silencer removal ?
    And are you also saying that the genuine LR air filter gives a better performance than an alternative , apparently equivalent, filter.
    Any particular reason for advising a spare to be kept ?

    Dave

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    Hi Pretdave
    "are you saying that the Defender reacts more favorably than the Discovery to a silencer removal ?"
    Yes, that's my experience - took a D2 2003 and my Defender at the same time: mine was noticeably changed in terms of power delivery, especially at low revs, and smoother through the gears.
    "And are you also saying that the genuine LR air filter gives a better performance than an alternative , apparently equivalent, filter."
    Yes, on the same D2 the genuine filter showed a marked improvement in reducing the lag.
    "Any particular reason for advising a spare to be kept ?"
    Most D2' that I know do not have a snorkel- the position of the air intake on the D2 is such, that in dusty conditions the filter gets clogged very easily. See an air filter on a D2 where it virtually "popped out" the housing cover and it was sucking in pure dirt. Three months later the owner had a problem on the no 1 piston where oil channel to the piston was clogged up, and the motor had to be redone. Maybe related? Methinks so. So- my advice, as we all know, check and "dust off" your filter regularly in dusty conditions on a long trip, and keep a spare, especially in the case of a D2 without snorkel.
    M2c's worth - like to hear your thoughts on this one.
    Regards
    LROC PRO
    Defender TD5
    Previous: '82 RR
    Series III R6

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    Thanks Defender ou

    Your comment on the LR filter is interesting - I must try one again.

    I am not sure that I agree with you interpretation of the Defender vs Disco : different cars react differently to removhg the silencer - I guess it could be more related to the condition of the exhaust sytem rather than the badge on the bonnet ?
    Carrying a spare air filter when on a long overland trip applies to all vehicles .
    Reminds me of a trip I did last year Pafuri - Vilanculos -Two days of dusty driving. At the first overnight stop a friend in a Land Cruiser decided to check on his filter: he found no filter . This was after a major , expensive service the previous week. (not by the agents , but by a prominent LC specialist). He carried all sorts of spare - but no airfilter - I bet he has included a spare airfilter for future trips !

    Dave

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    Removing the centre silencer doesn't change anything than adding noise. All the virtual improvements of better accelaration, smoother gear changes are only felt to justify the change ....I would be surprised seeing a power diagram before/after - showing any change if only the silencer was removed - that's wishfull thinking.

    If you want to have real "more power" - you need to go for chipping and/or significant changes, i.e. different (D)OHC, manifold, airfilter box,...

    M2CW

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    Quote Originally Posted by MR2-BLUE View Post
    Removing the centre silencer doesn't change anything than adding noise. All the virtual improvements of better accelaration, smoother gear changes are only felt to justify the change ....I would be surprised seeing a power diagram before/after - showing any change if only the silencer was removed - that's wishfull thinking.
    If you want to have real "more power" - you need to go for chipping and/or significant changes, i.e. different (D)OHC, manifold, airfilter box,...
    M2CW
    So , how long ago did you remove your centre silencer ? Still no performance improvement ?

    Dave

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    Quote Originally Posted by pretdave View Post
    So , how long ago did you remove your centre silencer ? Still no performance improvement ?

    Dave
    ...I didn't remove the center silencer because it doesn't give any improvements...

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    HI Basil
    Not as technical as others, wat i found is with the silenser usable tubo presure was at 2100rpm 1.2bar. Now with the silenser removed the turbo get to 1.2bar at 1800rpm. The big improvement is when i have the caravan behind me and in offroad conditions. The diesel consumption improved by 50km better on a 3/4tank. The noise is more than normal but on the open road no deference. In all it was the best thing i have done.

  15. #15
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    Hi Guys
    herewith the dyne results of a before and after removal of the silencer .
    (hope I've attached it correctly!)
    Regards
    Attached Images Attached Images
    LROC PRO
    Defender TD5
    Previous: '82 RR
    Series III R6

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  17. #16
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    I also contemplated doing this until a friend of mine did this to his Td5 Auto Facelift after I advised him that there was a lot of positive feedback on this forum regarding the removal of the silencer... in the end, he was pretty disgusted since it made little or no difference to the performance/consumption and increased the noise considerably.

    I think it might be different vehicles reacting different but also people's perception as well as tolerance to the increase in noise levels.

    I am not going to do this anymore...
    2001 Mitsubishi Pajero DID SWB
    2002 Bundu Offroad Trailer

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    Interesting Dyno results there. Spreads the torque curve nicely but drops the peak torque as well
    * "Wat Spike probeer sê in sy min woorde" -Die Skim "
    .................................................. .....

  19. #18
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    I also saw the nice torque spread.
    Add it to where the engine is dead but removes some of the peak to prevent the sudden wheel spin. (That kick you feel)

    Disco 2 TD5 XS
    Disco 2 V8 XS
    A platkar
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  20. #19
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    Regardless of the comments I still maintain that it made a significant difference to my D2's bottom end. The noise on mine only slightly increased. It can become a bit boomy when floored and producing power ie when towing up an incline. Difficult to say in what state the original was. It may have been blocked?? Removing the centre silencer also cured an irritaing vibrating noise. Unfortunatley the only dyno figures I have is after it was chipped.
    Deon Viljoen
    Boyscout

    2012 Land Rover Defender 90 2.2 Tdci S/W Sold
    2005 D2 XS TD5 Auto sold at 189000km
    2003 D2 GS TD5 Auto sold at 165000km
    1999 D2 GS V8 Auto sold at 178000km

  21. #20
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    Just had the cylincer emoved.
    Sligth change but the air filter must also be replaced.(STD one)
    Then only will I feel the actual result.
    Sounds awesome though.

    Disco 2 TD5 XS
    Disco 2 V8 XS
    A platkar
    A bicycle

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