Dump Valve

[T5-Nutter]

Is there any benefit to fitting a Bailey Dump Valve to my 850 T5? I have heard that they can damage the turbo, is this true?

[Mrsmopp]

There is no performance benefit as our cars already have a recirc DV unless you want the noise, it wont break your turbo but could mess with your MAF

x

[mostin58]

had a dump valve on my rover 620ti for 3 years with no probs, had to blank off recirculating one though.
tttttiiiiissssshhhhhh , awesome sound

[T5SLAVE]

Hi mate,
Im certainly no expert on the subject but I think Im right when I say this...by fitting a dumpvalve you should certainly expect NO performance gains (ie power or torque gains) from your unit! However, by fitting a dv you could in fact potentially help prelong the life of your turbo. This would be largely due to the fact that the built up charged air is released somewhat faster to atmosphere with the dv, hence the cool tissshh! Other than with an internal recircularitory system that would release those same unspent charged gases slower and may therefore be causing the turbo to experience more stress on its bearings etc as the gases place undue pressure on it!

I hope that made sense mate. I spose the best way to answer your question more definately would be to say that I have NEVER heard of any type of dv causing damage to a turbo but potentially helping as explained above.

Ok

Mark.

[T5-Nutter]

Thats cool, i understand what you are saying. Just know that a friend of mine changed the DV on his RX-7 and about 600 miles later the turbo blew which was only 18 months old and fitted in Japan before it was bought over!!

So should i go for it or not? All replies would be appreciated

[mostin58]

i would, as mark says it prolongs the life of the turbo. and lets face it a dump valve is cheaper than a new turbo.
think your friends was just a coincidence.

paul

[T5SLAVE]

Ok mate thats fine, I hear what ur saying. Bear in mind tho, your friend was dealing with an RX-7...that was his FIRST mistake...bought from Japan,so the dreaded import game now takes effect,remember those Jap nutcases play with their motas untold amounts,they wont bat an eyelid at stoopid 1000bhp figures using various crazy combos of parts and witch-craft, so take your chances I say!

As for the purchase and fitment of ur dv, of course you should buy and fit it, they look cool, sound cool and dont cost much to buy!

Im sorry to say but I have been known 2 own a number of fast Fords inc Cossie's and all have run dv's (mostly Bailey) with zero side effects :) Nor have I ever heard of such a problem, I'd be inclined to stick my neck out here and say ur m8's X's turbo was just a case of bad timing...except not for the sly monkey that sold it to him ;)

L8rs...

[speedswede]

This would be largely due to the fact that the built up charged air is released somewhat faster to atmosphere with the dv, hence the cool tissshh! Other than with an internal recircularitory system that would release those same unspent charged gases slower and may therefore be causing the turbo to experience more stress on its bearings etc as the gases place undue pressure on it!

Why would a recirculating DV release pressure slower than an atmospheric DV?

I understood the difference only to be that one dumps to atmosphere (and hisses) and the other doesn't. What determines which one you choose is which way the ECU meters the air. Some engine management systems do not meter the air correctly if you release air outside of a closed system (ie: you dump to atmosphere)

[T5SLAVE]

Like I said speedswede I aint no expert and what you say is very true of the metering.

I am pretty sure tho the realease to atmosphere is fractionally faster than the internal system (bear in mind we're talkin nano seconds!) and can therefore potentially help the turbo, as it's kept under pressure for fractionally less time! I cant remember where it was I heard the fact that fitting a dv could help prelong the life of your turbo (probably a Bailey promo leaflet years ago?) by the means I have explained here but it could make sense that the absolutely instantaneous release of built up charged air to atmosphere would be quicker as the release is in no way hindered??? Anyone out there a turbo expert?

At the end of the day a dv certainly wont hurt a turbo, as I think was the most important point T5-Nutter wanted clarifying :) As it happens I am now starting to consider fitting a dv to my new T5, tho somehow it seemed ok on a fast Ford but maybe outta place on a Volvo?

[BlackBeast]

If your fitting an atmos dump valve, you will need a twin piston version, if you go for a single piston then the car will stall all the time.

[Mrsmopp]

Personally speaking why fit a "performance" part if it wont help the performance? The ONLY reason for fitting one to a T5 IMO is for the noise, which is all well and good if your 15 or you like going round with a big banner over your head saying "LOOK AT ME"

x

[JUDGENINJA]

LOOK AT ME....!!! :sinner:

Just thought I'd add my two pence worth..

The volvo Recirculating DV is a diaphragm type DV which is basically a piece of rubber which over time could tear. I haven't seen this in Volvo DV's (What do I know, I've only seen two), but early aftermarket diaphragm type DV's for RS turbos etc would only last 2-3months before breaking. Nearly all of the after market ones these days are either Single or twin piston DV which are supposed to last longer.

You can even buy a recirculating Piston DV if you don't want the noise..

It's all down to personal preference....

[blackbooty]

Like I said speedswede I aint no expert and what you say is very true of the metering.

I am pretty sure tho the realease to atmosphere is fractionally faster than the internal system (bear in mind we're talkin nano seconds!) and can therefore potentially help the turbo, as it's kept under pressure for fractionally less time! I cant remember where it was I heard the fact that fitting a dv could help prelong the life of your turbo (probably a Bailey promo leaflet years ago?) by the means I have explained here but it could make sense that the absolutely instantaneous release of built up charged air to atmosphere would be quicker as the release is in no way hindered??? Anyone out there a turbo expert?

At the end of the day a dv certainly wont hurt a turbo, as I think was the most important point T5-Nutter wanted clarifying :) As it happens I am now starting to consider fitting a dv to my new T5, tho somehow it seemed ok on a fast Ford but maybe outta place on a Volvo?


im no expert but heres a thought.
all the saab 9000 turbo's ive owned (autos) have a recirc dv taking air from high pressure side and returning to low pressure side, between air filter and the turbo impeller.
this is dumped with a pleasing but not show off type psssttt every time my foot taken off the gas after giving it load.
iwill definatelly be trying to graft this item accrss to my t5.
so i think its down to the car manafaturer as to the rate at which air is reciculated rather than the difference being due to atmostpheric or in system dv's.

[flying brick]

I Have One On My 850 T5 Just Make Sure You Get The Right One Because Of The Soundproofing On The T5 You Will Have To Put The Window Down To Hear The Pppppppssssss Noise Sounds Good Outside The Car So Go For It!!!!

[TwistedSanity]

"Personally speaking why fit a "performance" part if it wont help the performance? The ONLY reason for fitting one to a T5 IMO is for the noise, which is all well and good if your 15 or you like going round with a big banner over your head saying "LOOK AT ME"""

lol, thats the bit i love, mine has a dump valve, cone filter and big arse exhaust, they were all fitted by the previous owner, the fun part is when people look round, they dont notice the volvo, everybody looks straight past it, most people dont know volvo make fast cars believe it or not, had mine for six months now, turbos still ok , think mine is a bailey motorsports ?
and im 37 years old

[Wobbly Dave]

"Personally speaking why fit a "performance" part if it wont help the performance? The ONLY reason for fitting one to a T5 IMO is for the noise, which is all well and good if your 15 or you like going round with a big banner over your head saying "LOOK AT ME"""

lol, thats the bit i love, mine has a dump valve, cone filter and big arse exhaust, they were all fitted by the previous owner, the fun part is when people look round, they dont notice the volvo, everybody looks straight past it, most people dont know volvo make fast cars believe it or not, had mine for six months now, turbos still ok , think mine is a bailey motorsports ?
and im 37 years old
Hot air induction? surely that cant help?

[The Flying Banana]

There is no performance benefit as our cars already have a recirc DV unless you want the noise, it wont break your turbo but could mess with your MAF

x


Mrs M ....you have to admit ( although a tad chavvy !!) it is a fantastic noise...!!n C'mon admit it ! It wont hurt!!!

[TwistedSanity]

The cone air filter sounds amazing but i do think it causes a drop in performance, from cruising at speed to sitting in traffick there is a noticable change in performance-but i dont have a standard air filter box to put back on for comparison :cool:

[Mrsmopp]

Mrs M ....you have to admit ( although a tad chavvy !!) it is a fantastic noise...!!n C'mon admit it ! It wont hurt!!!

A tad???? Sorry guys but I just cant see the appeal? Explain why the noise means so much to you all? Why is it so fantastic? I dont get it?

x

[Wobbly Dave]

IMHO fitting an airleak to a closed metered system can't help? Can it?

FB, If you want the noise - why not just "pisssshtt" yourself on each gear change? or have a MP3 of it on a button on the gear lever? Once the novelty has worn off then it is a bit cringeful? (IMHO)

[Mrsmopp]

lol, thats the bit i love, mine has a dump valve, cone filter and big arse exhaust, they were all fitted by the previous owner, the fun part is when people look round, they dont notice the volvo, everybody looks straight past it, most people dont know volvo make fast cars believe it or not, had mine for six months now, turbos still ok , think mine is a bailey motorsports ?
and im 37 years old

Aren't you embarrassed tho when sitting/pulling away from traffic lights and everyone knows it's you making all that noise over nothing? And since when do people look round when they hear a dump valve or a noisy zorst? I think most people roll their eyes not look round to see what "wicked mota" just went psssht! Just my opinion tho and that counts for nothing in the grand scheme of things - it wouldn't do for us all to be the same!

x

[The Flying Banana]

A tad???? Sorry guys but I just cant see the appeal? Explain why the noise means so much to you all? Why is it so fantastic? I dont get it?

x


I dont have one as i wouldnt fit one to a Volvo, the 1st time i heard one was 10 or more years ago when my mate built a Mark 2 Escort Mexico with a Cossy in it, he was running mahoosive turbo horses and needed it and at the time it was ( and stiil is a great sound ) . On the right car i purely like it for the sound but wouldnt go out my way to fit one on the Ovlov!! However if there was a power gain to be had with it or some kind of positive I am sure you would all have one irrespective of the noise

[Mrsmopp]

However if there was a power gain to be had with it or some kind of positive I am sure you would all have one irrespective of the noise

Very true!!

x

[The Flying Banana]

Very true!!

x


And how much do i want a Mark 2 Escort with a cossy in it !!!!!! Soooo badly!!!!!!

[arbee]

People will lekie the sound of it in the same way that they like the sound of a v8, or the woosh of gulps of air being sucked through a cone. They are evocative sounds, people may associate them with perfomance cars (like mk2 escorts with cossie lumps) and therefore like to emulate this on their own cars, volvo or not. That said, I can see the point people are making about the place of a DV on a volvo - I agree, its just not appropriate. ;) The sound of a DV, to me, is associated with Renault 5 Turbos and Mk4 RS Turbo Escorts.... 'nuff said?

Despite that... I had a dv on a previous car, loved the novelty of it at first but after a while (weeks!) noise got kinda embarrasing! Couple that with the fact that the car did not run as well as with a recirc and offered no performance at all.... i took it off.

[Mrsmopp]

people may associate them with perfomance cars (like mk2 escorts with cossie lumps) and therefore like to emulate this on their own cars, volvo or not.



I think this sentance says it all really, very well put.

I accept my car for what it is, a Volvo, a pretty quick one in the grand scheme of things but a Volvo all the same. Why would I want to emulate something else?

x

[T5SLAVE]

All these dv comments are quite fair enough but think about it this way, forget the whole "it belongs on a cossie" thing, or "does it improve performance or not?" for just a minute and ask yourselves why do you change anything about the look ar sound of YOUR Volvo...not any other car, YOUR Volvo! Most of us here want, or at least have a nice big set of rims, maybe a shiny zorst with neat back box and I've no doubt countless other mods, and why, because we want to be a little different and stand out from the crowd? Am I wrong, please correct me if I am?

Now as you may or may not know I come from a long standing fast Ford background, I'm not going to get carried away here otherwise this post will be truely mahooosive BUT what I have found so far in my very young ownership and initial introduction into Volvo life doesn't differ much from that of the (supposed kings of performance in many ppl's eye's) the RS Ford cohorts! You all love your cars for whatever reason, some of them are truely great performance cars in their own right, so if you wanna fit a dv, bleedin fit one and be proud...don't give me any of this, "it's a Volvo so it don't belong" if that's the case stop trying to fit even bigger wheels and saucy body mods ;o)


I'd just like to add I'm really very happy with my T5 so far and I never thought I'd say that considering some of the car's I've owned! I haven't even had the time to clean it yet, let alone change any bits on it. I'm seriously considering a dv tho and the first person that pokes me about the fact that its's only a Volvo is gonna get an ear bashin let me tell ya!!!

L8rs all...

[Mrsmopp]

for just a minute and ask yourselves why do you change anything about the look ar sound of YOUR Volvo...not any other car, YOUR Volvo! Most of us here want, or at least have a nice big set of rims, maybe a shiny zorst with neat back box and I've no doubt countless other mods, and why, because we want to be a little different and stand out from the crowd? Am I wrong, please correct me if I am?
.

I have a set of 17 inch wheels on mine as it handled like a bag of horse manure with 16's - nothing to do with wanting to be "different" or making my car stand out because it doesn't. I dont have anything that makes my car stand out from the crowd. Why would I want it to? I have notjing to prove to anyone. My only other modification is a remap and air filter which are both performance modifications (ie they increase the performance)

Like I said before its just my opinion and my opinion counts for nothing in the grand scheme of things but I am allowed to voice this opinion and so I have.

x

[Andrew]

As I've said - I have DV - it was on the car when I bought it. My initial intention was to get rid of it.

However as time has gone on I've grown quite fond of it. I've learnt how to control it with my right foot and can activate it if I need to as and when with a flick of my foot.

I've grown almost attached to the way it dumps air and the sound it makes. You can all call me what you like but I'm keeping it so there :riceboy:

As Mrs Mopp said - life would be boring if we where all the same.

I own a Volvo - I'm proud to own a Volvo - it doesn't mean I'm pipe and slippers brigade and just because I have a DV doesn't mean I'm max power either :P

[flying brick]

as i have said i have one on my 850 t5 every gearchange is a pleasure, its each to their own,most of the negative comments fit in with the boaring old woolie jumper volvo drivers which people who dont know about t5s think of all of us, john...age 38

[JO5EPH]

If I got a dump valve it would certainly not be to 'emulate' other cars. It would be because I like the sound etc on MY car.

It's basically down to differing opinions, and those can be argued all day long, but facts cant be argued.

Thing is, no-one seems to have any solid facts (with evidence) of the affects (positive or negative) of fitting a dump valve.

So if YOU like the sound of them, get one fitted to YOUR car, if you dont, are you bothered??

Joe :)

P.S. One was fitted to my calibra turbo when I bought it, and I must admit, it did bring a smile to my face now and then :D

[Mrsmopp]

most of the negative comments fit in with the boaring old woolie jumper volvo drivers which people who dont know about t5s think of all of us, john...age 38

Hardly! So are you saying I dont know about T5's and that I am boring and old? I think you will find you are completely wrong in your generalisation - ask any serious tuner/mechanic worth his weight about DV's on T5's and they will all tell you the same!!!

Mrsmopp age 24!!! :slap:

x

[flying brick]

there is no debate a dump valve does not give any performance enhancement to a t5 but there is no harm in fitting one if you like the noise,was not saying that you know nothing about t5s i was talking about non volvo drivers you have took it the wrong way

[Andrew]

ask any serious tuner/mechanic worth his weight about DV's on T5's and they will all tell you the same!!!


Sometimes MrsM it's not what they think that counts - sometimes we do stuff cos *we* like it :)

[LeeT5]

Hardly! So are you saying I dont know about T5's and that I am boring and old? I think you will find you are completely wrong in your generalisation - ask any serious tuner/mechanic worth his weight about DV's on T5's and they will all tell you the same!!!

Mrsmopp age 24!!! :slap:

x

:slap: Actually moppy he wasn't saying that at all!! His comments weren't directed at you.....I think you missed the point.
What he is actually saying is that everyone knows ppl fit DVs to fords, supras etc and most ppl associate Volvos with middle aged or old men...but the next generation of tuned cars will include more volvos and less fords (getting rarer) thus ppl wont mind so much. As everyone knows Tuning Volvos is a relatively recent thing and ppl wont expect a volvo 850 to suddenly light up the front wheels burbling 5 pot exhaust tunes and spitting out big mouthfuls of charged air PPPPPSSSSSSSTTTTTTTTTT! to go roaring past them. :eek:

Therefore i say fit a DV if you want. They do NOT damage turbos and some are louder than others...I personally love 'em and if i had a manual i would fit one.

[Engineer]

:slap: As everyone knows Tuning Volvos is a relatively recent thing and ppl wont expect a volvo 850 to suddenly light up the front wheels burbling 5 pot exhaust tunes and spitting out big mouthfuls of charged air PPPPPSSSSSSSTTTTTTTTTT! to go roaring past them. :eek: You don't know s--t mate peeps have been tuning Volvo's since the 50's that's half a century by my reconning lol :wink:

[LeeT5]

You don't know s--t mate peeps have been tuning Volvo's since the 50's that's half a century by my reconning lol :wink:

You know what i mean..... I'm talking about the average joe bloggs. Volvo have long been trying to shake the old man image and it is finally working...otherwise i wouldnt be driving one. I had my first 440 GLT at just 19. Went on to have 2 Turbos and then 3 850's....and i'm now 32.

I'm not talking about the swedes tuning them in rallys in the 70's.

[Andrew]

You don't know s--t mate peeps have been tuning Volvo's since the 50's that's half a century by my reconning lol :wink:

Have you been drinking again old man ?

[Engineer]

You know what i mean..... I'm talking about the average joe bloggs. Volvo have long been trying to shake the old man image and it is finally working...otherwise i wouldnt be driving one. I had my first 440 GLT at just 19. Went on to have 2 Turbos and then 3 850's....and i'm now 32.

I'm not talking about the swedes tuning them in rallys in the 70's.I do now and btw it was the mainly the 50's & 60's the 70's belonged to a different breed of rally car lol.

[TwistedSanity]

well im a boy(maybe an old one now) and when i grew up boys liked noises, knobs and buttons, the think i love most is that no matter how noisey my volvo is , and how hard i drive it , people look straight through it , the only visual mods are the big ass tailpipe, the 17" alloys and the 1"drop, it is a real wolf in sheeps clothing, and its killed many a scooby and porscher, hooligan in wolfs clothing, thats me!!

[craig]

Is there any benefit to fitting a Bailey Dump Valve to my 850 T5? I have heard that they can damage the turbo, is this true?


bet you never expected that much passion.

[theravedaddy]

with reference to the old man volvo thing.......one of the neighbours nodded to me today as i now drive a burgundy estate just like the 4 other sensible estates in our road.
.............miserable gits have spent the previous 17 years looking down their noses at me when i had me bikes gto n galant.
ill be invited to the residents meeting next.....must get to m&s to get a tweed cap............
..........and halfords next door for a dump valve :sinner:

[Baj]

I'll add my fuppenny bit if I may; It is all down to personal taste, nothing more.
If MrsM doesnt like a DV then she doesnt fit one, if someone else does, they do.
I used to have a Punto GT with all the gubbins and it was quick but the addition of the DV gave me that extra little indescribeable thing that boys like.
As someone said earlier you can control the sound to a degree. Dont floor it and release your foot slowly will sound very different to hammering the pedal and lifting quick.

One annoying thing though is some sound like someone shouting 'Tisht' while others have a sexy noise that evokes powerful machinery. It is hard to tell what is the defining factor as to what noise is made.
I have seen some with trumpets. Do these go 'Toot'?

[GuyD5]

Do these go 'Toot'?Or even 'poooft' ;)

[theravedaddy]

its all down to pressure control.....a low pressure release produces the "tisssshhhh" while a higher pressure let off produces a deeper,more satisfying "whoooosh"....followed by a slipper to the side of the head and orders to open the window......
'think the same principle applies to dv's too.....

[GuyD5]

'think the same principle applies to dv's too.....Awesome :) .... obviously from a man who knows ;) :)

[Wobbly Dave]

depends also if you lean to oneside during the delivery.

[BlackBeast]

I used to have a Punto GT with all the gubbins and it was quick but the addition of the DV gave me that extra little indescribeable thing that boys like.


Same here, i used to have a PGT with a baileys 26. Loved the sound. Would i put one on my T5, not sure, i like the stealthyness of the Volvo too much now. That said, i do plan to put a 3" exhaust system from the turbo back on it sometime :D

[blackbooty]

:slap: Actually moppy he wasn't saying that at all!! His comments weren't directed at you.....I think you missed the point.
What he is actually saying is that everyone knows ppl fit DVs to fords, supras etc and most ppl associate Volvos with middle aged or old men...but the next generation of tuned cars will include more volvos and less fords (getting rarer) thus ppl wont mind so much. As everyone knows Tuning Volvos is a relatively recent thing and ppl wont expect a volvo 850 to suddenly light up the front wheels burbling 5 pot exhaust tunes and spitting out big mouthfuls of charged air PPPPPSSSSSSSTTTTTTTTTT! to go roaring past them. :eek:

Therefore i say fit a DV if you want. They do NOT damage turbos and some are louder than others...I personally love 'em and if i had a manual i would fit one.

ive had recirc valves on all my auto's mate, they dump when you lift your right foot, if you dont lift, they dont psssssttt.
Personally i like a quiet dump... every1 looking at me when i dump is offputting !!! lol.