Exhaust Modification

[strapping young lad]

ive seen a few discoveries with the rear silencer removed and repiped to the rear quarter panel (like defenders i suppose)

what is the advantage of doing this and also whats the legal implication (MOT for example)

thanks

dyf

[Digsit]

Dont know about the legal implications but I can think of one immediate advantage.

Stops you reversing into a muddy bank and burying the tailpipe at speed causing the whole back section to fold thro 90 degrees and mash itself up into the wheel arch    

One of the first expensive mistakes I made about three weeks after buying mine

My replacement is still in the usual position but I have to remember to THINK before I reverse :D

[Porny]

I think this is something my brother want's to do on his Discovery in the near future.... just haven't got chance at the moment.

Did, however, remove the centre silencer on his 200Tdi and replaced it with a straight through piece of pipe.

Makes it go a bit better mid range, and sounds rather good!!!  :D


When it comes to modifying the rear section, will need to put a smaller silencer tucked up somewhere, as although not 'too' loud, it would be a bit loud with any silencers!!!  


Ian

[Range Rover Blues]

The back box on our V8 doesn't do a lot, but it keeps the neighbouts happy.

TBH I got fed up with the noise from having a straight thro' pipe at the back so I fitted a s/h system.  It had been issued with an MOT though.....

[lee celtic]

I've seen the pipe exit through  the side and was thinking of doing it using an exhaust outlet from a boat (like a slash cut with a stainless surround )and flexi exhaust pipe again from a boat yard . :D

 :?: How much better is it with the middle box removed  :?:

[Dave]

I know that sooty has done his pipe out the rear panel "V8 disco"

[HIPPO]

With the centre box removed it makes a deeper noise, performance wise it does give a bit more in midrange but not that much really.  It does however get rid of that huge box from underneath.  If you do remove it, it may be wise to fit a small bit of flexy pipe to allow for engine movement with out it straining the exhaust as fitted on 300 TDi's :roll:

[HIPPO]

Has anyone or does anyone run a diesel disco without any silencers?  if so how loud is it?  I know that everyones version of loud is different, but does it get annoying on a long run, does it turn heads and does it really make a performance difference?

Also does anyone out there know SPIKEY who is breaking the 300 tdi disco in the FOR SALE bit, as i am waiting a reply about a post- guess i am just impatient!!

thanks

[strapping young lad]

ive driven my escort when the exhaust fell off

loss of power and noisy as hell

think about it though

tractors only have one silencer

[Disco Inferno]

my 200tdi disco runs without any silencers on a 3" straight through pipe

pass's mot's fine although it is loud, bizarely though the noise inside isn't that bad even with no interior, carpets or sound proofing. however before i turned it out the side the noise was unbearable as the rear silencer fell out obviously under the floor
Mine had a compunt bend behind the rear wheel so comes out where the rubbing strip was on the rear quarter.

it does turn heads especially round town. potentially the engine rev's a little mroe freely than before  but its not one of the magical "20% increase in bhp guaranteed" mod's.

my bends were sourced through demon tweaks in wrexham and the centre box replacment pipe was made using an existign box, which was anchored to the bench before cutting. cut the box out, get a suiitable piece of pipe to fill in the gap and weld it back up.

[Porny]

Any pics???

Think I might be doing this mod to a Discovery soon    :roll:



Ian

[Arightpest]

Hello All :D

A very good friend of mine once fitted a Fiat uno turbo engine into an X19 and if anybody knows the car it’s a mid engined car like an mr2 the length of the exhorts was no longer than 3 feet  :shock: it came out of the turbo and popped out just under the rear bumper with no silencers fitted at all.
The first time we started it up we expected it to wake the dead :twisted:  but some clever dick we know told us that because noise is caused by a engine firing pulses the more the cylinders the smother the power pulses the quieter the engine equals a v8 with very short pipes sounds brilliant, :twisted:  the pulses produced by a turbo engine vehicle are forced into the turbines this compresses the pulses smoothing them out so once it leaves the turbo and enters the exhort it is far quieter than an old escort with a broken exhorts

[Range Rover Blues]

I've run my Cav without an exhaust, it's b***y noisy!

That's a good point about the turbo though, it does absorb a lot of energy from the engine, and noise is energy.
Difference between diesel and petrol is that diesel really doesn't like back-pressure, more so with a turbo, hence the TDi has an exhaust at least as big as a V8, even though the V8 is bigger capacity.