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Diesel ExhaustsDeleted
@Deleted
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OK, Bit of a daft questions in all honesty! But please bear with me  I've seen some vids on u tube of ppl claiming to have Straight though exhausts on T Diesels. Sounds good imo, The kinda sound i want my saff td to have. Little bit like this: uk.youtube.com/watch?v=Vzm-j4k9tNIOnly thing is, Is that all it is? Literally a straight though piece of pipe from the Turbo to the end? I don't want it too loud or crappy sounding. But i do want that turbo whistle. Or do they just leave in a box or two. Cause i know u fit a straight though on a petrol it can be damn loud!! But i don't know how it works and if it's the same with Dervs. I'm gonna start pricing up pipes and don't want to spend out on a scafolding pole to have it sounding poo! Thanks for hearing me out! lol Dan |
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Diesels are inherently quieter than a petrol,
Strap a turbo on the end of the manifold and its even better.
I remember reading on here about a diesel caterham running a straight through exhaust with no silencer at all..
I'd say go for it as you can always stick a cherry bomb on the end if its too loud.
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Could you fit a screamer pipe to a diesel? or maybe if you did, would it sound rubbish?
Anyone done it?
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Faster. Faster. Until the thrill of speed overcomes the fear of death.
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I bought a VW T25 crew cab a few years ago. It was mega cheap and was fitted with a 1.8 TDi from a passat. From the day I got it the exhaust was lying in the crew part of the cab and the engine sounded great. There was only a down pipe and nothing else as the engine was at the back so no need for a pipe to the back. Worth giving it a try as it costs nothing to take the pipe off and see how it sounds. Here is a pic of my crew cab;  Dave |
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I dunno... the exhaust fell off my truck halfway down the country once.. left me about a foot of downpipe then nothing. Beefy sounding, yes, but also loud enough to shake windows and wake dead people. Ask colonelk, I moved a carlton for him during that trip  |
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To get a standard A40 this low, you'd have to dig a hole to put it in |
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I have a sortof related question if that's ok? i've been having impure thoughts about my ratty old rangerover and replacing it's broken engine with a TDi unit from a discovery and a 3inch straight-through turbo to rear end pipe.. i'm not so bothered about the noise provided I can get it through an mot, but I know that petrol cars need some back pressure from the exhaust system to run properly.. will running a straight/open pipe behind the turbo start robbing me of power or is the turbo going to provide enough restriction on it's own? i've seen pictures of turbo'd bikes running on a slashcut open pipe that was about 4 inches total in length.. literally just enough to point the flames and hot gasses away from the fairing but do they work because they're low capacity / high revving engines? how will that transfer to something around 2.5L and low-revving? [edit to add:] forgot i was going to say, the broken engine in my range rover was a 3.8L NA Diesel, i ran it for the last month with a crack in the exhaust system before the first box, so basically had the manifold and about 3foot of pipe.. it was loud enough to set off car alarms as i passed was fun really so long as you wore the ear defenders, i would've ran it like that but the amount of smoke coming through the cab was killing me  |
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Last Edit: Dec 8, 2008 12:43:43 GMT by karoshi
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LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,712
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Diesels sound awful, there's no debating that, so making it sound louder is surely just adding to your misery of owning one?
There's a lad near me who's got a golf tdi type affair running some sort of chav exhaust and it just sounds liked a curse word tractor, i guess if you like that sort of thing, go nuts!
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i know someone with a discovery TD5 with a straight through exhaust. It sounds really really hard, a bit like an arctic really!
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1997 TVR Chimaera
2009 Westfield Megabusa
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bortaf
Posted a lot
Posts: 4,549
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The turbo absorbs a lot of the noise energy from the Ex (or rather converts it), me mums Lucida TD has onlt the small centre box cos the back one has fallen off, you'd never know it was missing but the Lucida runs a small turbo, very restrictive ect.
A turbo engine will run quieter than a non turbo for this reason and TBH it sounds better than a non turbo diesel with no silencers but not as nice as a petrol.
Diesels also create less noise as they turn more of the energy into power, hense they are more economical than petrol but still worth a test as like i say the bigger the turbo the more curse word the tend to sound IMHO
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R.I.P photobucket
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JasonB
Part of things
Posts: 134
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Some good viewpoints here.
About a month ago I gave my Rover 200 Sdi a quick lookover for the MOT.
I got it for £150 from a relative purely as a cheap winter hack. I'd thought it was loud when picking it up and giving it a quick test drive.
During the mot lookover I was shocked to find literally half the back box missing and the joint from centre pipe to back box was like a collander (sp?)
Coughed up £120 for the two sections (fitted) and went round to pick it up expecting a lot less noise.
Very surprised to hear no change at all. Now if that was a petrol engine it would've been making a right old racket with hardly any exhaust.
I hear turbos are supposed to make a straight through exhaust easier due to them providing back pressure but I was shocked at the lack of difference to the noise. also the std. exhaust was a good 2.5" bore - looked very meaty!
Give it a go and see what happens.
Anyway of cobbling something up out of scrap pieces of pipe etc. just to get an idea before you comit to spending money?
JB
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1977 Kawasaki Z650
1983 Ford Fiesta (Project)
1985 Kawasaki GPz900R
1993 Toyota MR2 Turbo
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I run a single box (magnex) de-cated exhaust on my Audi 80 tdi with no real sound increase, but interestingly the turbo now spins up loads quicker and earlier, from as low down as 1500rpm, this due to the decreased back pressure I assume, I've been thinking about running an open system for a while now as just the other month the center clamp broke splitting the system so it was unsilenced,
I thought it sounded great!
& as for '2002gimp' about diesels sounding awful..
honestly.. I would have the sound of a four pot diesel over a four pot petrol anyday!!
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1970 Beetle 1600
1973 Rover P6 2000SC
1993 Audi 80 Avant 1.9TDI
1996 Transit SWB pop top camper, 2L Twink
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Filthyjohn
Part of things
Currently on the road: 1/11
Posts: 705
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Diesels can sound great, as long as you make the exhaust loud enough to drown out the clatter of the injector pump.
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'95 Volvo 945 Turbo
'87 Volvo 765 TIC
'75 Opel Manta A 2.0 16v,
'86 Volvo 360 turbo,
'62 amazon,
'67 MGB GT.
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I'd say go for it as you can always stick a cherry bomb on the end if its too loud.  the cherry bomb on my 100A has made it 10x LOUDER! i set off a loada car alarms in the multistory just the other day |
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Your car is not 'epic', this thread is not 'epic'....the OCEAN is epic, the UNIVERSE is epic.... please stop misusing this word!! It would appear Hotrods are the new VWs - aint fashion funny! '69 BUICK LESABRE 350 |
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Diesel Exhaustsmilfordcubicle
@GUEST
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Diesels sound awful, there's no debating that, so making it sound louder is surely just adding to your misery of owning one? There's a lad near me who's got a golf tdi type affair running some sort of chav exhaust and it just sounds liked a broken tractor, I guess if you like that sort of thing, go nuts! 4-cylinder diesels sound pretty poor, but anything more is lovely... |
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Diesel Exhaustssowen
@sowen
Club Retro Rides Member 24
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An ex colleague of mine had a Fiat Tipo turbo diesel, fitted by the previous owner with a single large bore stainless box at the back, it sounded awful, like an old tractor being thrashed. My mondeo has lost its back box, but still retains the cat and centre box. It does sound a little throatier now but is still very quiet.
Do you have a cat fitted? That and the turbo are the main components that absorb the sound in the exhaust system. What you could do is use one middle box, the ones that are straight through, to refine the sound.
By the way, some Land Rovers with the tdi engines have just two straight through silencers after the turbo, and the bores are fairly large. What also helps to reduce unwanted exhaust sound but keep the burble is to put gentle curves into the pipe. If you were to run a straight pipe direct from the manifold, and then compare it to a pipe that gently weaves around under the car, in my experience you will notice a considerable difference in the quality of the sound coming out, without having to put restrictive silencers in place.
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Diesel ExhaustsDeleted
@Deleted
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Some useful information folks chears!
My pipe will have to have bends in to follow the rout of the factory pipe. I don't have cats luckly and as said by others, this already has a pretty beefy bore compared to petrol versions.
Chears!
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Last Edit: Dec 8, 2008 19:49:27 GMT by Deleted
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I ran my 306 TD with a centre box (straight through with the perforated tube = absorbtive) and no other silencing. That was only ever so sightly louder than with the full particle filter and back box as from the factory but a hell of a lot quicker.
I don't think it's possible to make any derv sound 'good' in a petrol type way but you will get more power with less exhaust silencing.
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bortaf
Posted a lot
Posts: 4,549
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I run a single box (magnex) de-cated exhaust on my Audi 80 tdi with no real sound increase, but interestingly the turbo now spins up loads quicker and earlier, from as low down as 1500rpm, this due to the decreased back pressure I assume, I've been thinking about running an open system for a while now as just the other month the center clamp broke splitting the system so it was unsilenced, I thought it sounded great! & as for '2002gimp' about diesels sounding awful.. honestly.. I would have the sound of a four pot diesel over a four pot petrol anyday!! Tust think how quick the turbo would spin up if it was fitted at the back of the exhaust with no back pressure at all |
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R.I.P photobucket
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rtlkyuubi
Posted a lot
Low and Slow
Posts: 2,922
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we run bus engines at work with no exhaust on (and there just a cat and straight through backbox) and they're not much louder.
Also you want as little back pressure as possible with a turbo. When more gas can exit at a quicker speed it spools the turbo up faster.
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Colonelk
Posted a lot
Posts: 3,742
Club RR Member Number: 83
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Diesel ExhaustsColonelk
@colonelk
Club Retro Rides Member 83
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I dunno... the exhaust fell off my truck halfway down the country once.. left me about a foot of downpipe then nothing. Beefy sounding, yes, but also loud enough to shake windows and wake dead people. Ask colonelk, I moved a carlton for him during that trip haha I remember the phone convo *rings* me- "hello?" Scary- "RAAAAAAAAAAAAAAAAAAAAA er RAAAAAAAAAAAAAAAA yeah RAAAAAAAA the RAAAAAAAAAAAA exhaust RAAAAAAAAAAA fell off RAAAAAAAAAAAA the van RAAAAAAAAAAAAA so we're RAAAAAAAAAAAAAAAAAAAAA running late RAAAAAAAAAAAAAAAA" LOLz! isnt that non-turbo though? I know the nova TD boys put a cone straight on the turbo entry for maximum whistle. |
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Last Edit: Dec 8, 2008 22:16:08 GMT by Colonelk
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the cherry bomb on my 100A has made it 10x LOUDER! i set off a loada car alarms in the multistory just the other day
