Landy Blog - Disco Turbo Diesel and Silencers

Disco Turbo Diesel and Silencers

Location: Blogs Disco 2 Experience
Posted by: David Pretorius	1/30/2008 7:59 PM
The Disco Diesels are fitted with the same exhaust system as the V8's. This is overkill as a turbo motor needs little in the way of exhaust silencers. The turbo is sufficient to isolate the exhaust from the pressure pulses emanating from the combustion chambers. Removal of a silencer or two causes little increase in noise and gives a small but useful increase in power , particularly at low revs (ie that terrible dead spot) Thats the theory , anway! I plucked up courage and had my Disco's main box removed yesterday and replaced by a straight thru section of pipe. Results? An extra rasp to the exhaust note and a noticeable , if small,improvement in power. See the "Tecno Babble" album in the "Gallery" for a pic.

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Comments (5)

Re: Disco Turbo Diesel and Silencers	By liamgo on 3/3/2008 2:42 PM
Could this not cause long term dammage to motor ?

Re: Disco Turbo Diesel and Silencers

By Dave on 3/3/2008 3:46 PM

I doubt strongly whether this has any downside . I am however not an experienced motor mech.
I base my judgement on the following :
Several reputable Landy specialists have approved it (Landy Online , Da Gama Motors and others)
Turbo temperature , head temperatureand exhaust gas temperature are all critical for a turbo diesel life span. Reducing back pressure in the exhaust can only help these factors : the hot exhaust gases will get out quicker and they will be cooler due to reduced pressure.(gases cool when they expand under reduced pressure)
I guess what is of great importance is the drivers treatment of the engine : push it hard thru the gears to enjoy the raspier hxhaust note and any longevity gains could be blown aginst the wall !
Note that almost all exhaust specialists will not be happy - they will mumble on about tiuned exhaust lengths and minimum back pressure . I am told that this is of no consequence with a tubo diesel , because the turbo acts aa a "firewall" between the exhaust manifold and the rest of the exhaust system . Seems very logical to me - but once again I am not a mechanical expert !
Cheers
Dave

Re: Disco Turbo Diesel and Silencers	By Camelman on 6/6/2008 10:12 PM
Having read this thread, I went out and did just that. Much better sounding with slight power gains. I said slight. The engine just seems to run smoother. No real EGT differences though. But thanks again now my td5 looks AND sounds the part.

Re: Disco Turbo Diesel and Silencers	By Dave on 6/6/2008 11:10 PM
Thanks for the feedback Camelman Makes it worthwhile sharing ideas ! Cheers Dave PS It does sound nice , doesnt it ?

Re: Disco Turbo Diesel and Silencers	By waveydavey on 8/11/2008 12:23 AM
Interesting thought: About a year ago the exhaust on my RR quite literally fell apart; the back was not connected to the front, the daft thing is I genuinly didn't know until it was ona ramp adn we looked underneath (UK MOT Test). This makes sense as it is the same system as the V8 but mine is a BMW turbo diesel. The idea should save a few pannies nect time it needs a replacement!