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Greeny



Member Since: 20 Mar 2018
Location: Buckinghamshire
Posts: 272
England 
Straight Through Exhaust
I have been told that you need some back pressure from a silencer for the engine. With a 1999 TD5 it does not have a CAT. If I was to completely straight pipe the exhaust, no small rear silencer etc, would I need to have a smaller silencer on it to build up some back pressure? After going in a TD5 with no rear silencer it sounded amazing, but they told me it had a small silencer where the CAT is to keep some back pressure. So if I dont have a CAT do I need some sort of silencer to keep the engine running nicely or can I just remove my rear silencer so it is fully straight piped?

Thanks. Instagram - @Land_Rover_Defender
Post #713378 20th Jun 2018 7:26am
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039
Netherlands 2003 Defender 90 Td5 PU Caledonian Blue
The rear silencer doesn't give much back pressure and I only run the rear silencer. No problems. I don't think a turbo diesel needs any back pressure.

http://www.youtube.com/watch?v=JtvkRCuHmKM Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)
Post #713388 20th Jun 2018 8:13am
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Greeny



Member Since: 20 Mar 2018
Location: Buckinghamshire
Posts: 272
England 
Thanks,

At the moment the exhaust has the middle box removed and replaced with a straight pipe and I am running a small silencer on the rear. Because it is a 1999 TD5 it does not have a CAT. I have been told that you need some back pressure, and I was thinking that if I removed the rear silencer it wouldn't have any at all. Instagram - @Land_Rover_Defender
Post #713394 20th Jun 2018 8:26am
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Clive



Member Since: 21 Mar 2014
Location: Littleborough
Posts: 467
United Kingdom 2004 Defender 90 Td5 X-Tech LE Zambezi Silver
I'm not so sure that a TD "needs" back pressure but in any case the turbo itself will create some, my understanding is that the less constriction there is after the turbo the more responsive it will be by spooling up more quickly.
Post #713431 20th Jun 2018 11:41am
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Greeny



Member Since: 20 Mar 2018
Location: Buckinghamshire
Posts: 272
England 
So you think that running a full straight pipe will be fine? Original downpipe and then straight through after that. Instagram - @Land_Rover_Defender
Post #713445 20th Jun 2018 1:45pm
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2162
2004 Defender 110 Td5 DCPU Epsom Green
Diesels dont need back pressure. Fit one Instagram @defender_ventures
Empire Tuning - Agent
Post #713510 20th Jun 2018 6:39pm
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Greeny



Member Since: 20 Mar 2018
Location: Buckinghamshire
Posts: 272
England 
Thanks for the replies guys! Instagram - @Land_Rover_Defender
Post #713600 21st Jun 2018 7:10am
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pj2106



Member Since: 20 Dec 2012
Location: Huntingdon AKA The Shire
Posts: 1500
United Kingdom 2008 Defender 110 Puma 2.4 USW Stornoway Grey
Keep the last rear small silencer or it makes it to raspy and annoying 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold
1998 300TDi D1 (Billy) Sold
Post #713632 21st Jun 2018 9:08am
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Greeny



Member Since: 20 Mar 2018
Location: Buckinghamshire
Posts: 272
England 
I dont mind it being raspy. I dont drive long distances so I want it to be loud when I do drive it. Instagram - @Land_Rover_Defender
Post #713633 21st Jun 2018 9:11am
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Pilgrimmick



Member Since: 16 Nov 2015
Location: Highlands
Posts: 582
United Kingdom 
Seems a bit anti social just being loud for the sake of it! 80" 1948
Lightweight V8
Bowler Tomcat
130 Station wagon
90 300tdi
(Santana PS10 pick up)
Range Rover L322 (Ful fat)
Post #713671 21st Jun 2018 1:28pm
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5 POT



Member Since: 24 Nov 2014
Location: UK
Posts: 81
United Kingdom 2005 Defender 110 Td5 SW Java Black
I kept the front silencer in the front pipe and straight through from there - sounds amazing! It isn't anti social until you want it to be. You need to get your exhaust gases away as quickly as possible so better to have less silencers nearer the rear.

I have a mate who went straight through without any silencers inc the front and his kept going into limp mode because of the over boost (remap and intercooler as well) so he fitted a boost box and all was fine.

I would keep your front pipe as is and just swap the rear pipe out for a non silenced section

Post #713851 22nd Jun 2018 10:49am
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BLACK LAB



Member Since: 07 Dec 2016
Location: AYRSHIRE
Posts: 165
United Kingdom 2006 Defender 90 Td5 XS CSW Tonga Green
That sounds pretty good . 2006 DEFENDER 90 TD5 CSW XS
2018 RANGE ROVER SPORT HSE DYNAMIC
Post #713906 22nd Jun 2018 5:48pm
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pj2106



Member Since: 20 Dec 2012
Location: Huntingdon AKA The Shire
Posts: 1500
United Kingdom 2008 Defender 110 Puma 2.4 USW Stornoway Grey
5 pot do you mean the manifold down pipe? As in the cat you left on or the middle section? 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold
1998 300TDi D1 (Billy) Sold
Post #713950 22nd Jun 2018 10:06pm
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Lancerdoc999



Member Since: 10 Apr 2016
Location: South Wales
Posts: 205
United Kingdom 
How does this affect the new MOT rules. I have removed my mid and rear and need to replace with something, just not sure what at the moment.
Post #714186 24th Jun 2018 2:32pm
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Greeny



Member Since: 20 Mar 2018
Location: Buckinghamshire
Posts: 272
England 
5 POT wrote:
I kept the front silencer in the front pipe and straight through from there - sounds amazing! It isn't anti social until you want it to be. You need to get your exhaust gases away as quickly as possible so better to have less silencers nearer the rear.

I have a mate who went straight through without any silencers inc the front and his kept going into limp mode because of the over boost (remap and intercooler as well) so he fitted a boost box and all was fine.

I would keep your front pipe as is and just swap the rear pipe out for a non silenced section



My front pipe is standard yes. But it doesnt have a silencer in it? Because its 1999 it doesnt have a CAT so is just straight down from the manifold. Instagram - @Land_Rover_Defender
Post #714232 24th Jun 2018 7:11pm
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