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#181669 - 28th Oct 2007 11:49pm Dump Valves
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
my mate has a 306 1.9 td. he is thinkin of gettin a dump valve 4 it. is it worth it or will it just make a pathetic lil puffing noise? also hat are the pros and cons on dump valves?

thanks

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#181670 - 28th Oct 2007 11:52pm Re: Dump Valves [Re: Petei123]
Mark Offline


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Registered: 9th Nov 2003
Posts: 21085
Loc: Wirral
I don't know if ive heard one on a diesel ?

Sorry i cant help mate, love the description lol
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#181671 - 28th Oct 2007 11:52pm Re: Dump Valves [Re: Petei123]
MattLFC Offline
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Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Lol I remember these being discussed in some detail on the 306 forums. I took an interest as I wanted a D Turbo at the time.

They dont do nothing for it to be honest, other then astetically of course.

Has he done a full stage 1 tune up? Id prefer to spend 100 and take it to a specialist to be tuned (you can do it yaself but its best to take to a specialist who can tune it for its best output on a rr) then the couple of hundred on dump valves for little benefit.

Get a 406 intercooler and he could be pushing insane boost lol, some peeps are pushing 140bhp+ from the DTurbo's on there with just a few small mods.

115bhp+ is realistic from just a stage 1.

smile

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#181672 - 28th Oct 2007 11:55pm Re: Dump Valves [Re: MattLFC]
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
all i know is that he has a straight thru with sorts cat from the manifold, and a BMC air filter thats off the top of my head, but he had it rr'd at 112 bhp

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#181673 - 28th Oct 2007 11:57pm Re: Dump Valves [Re: Petei123]
turbo_stu Offline
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Registered: 2nd Jan 2006
Posts: 665
Loc: my head
as matty says it more fitted for the noise unless your pushing real power.
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#181674 - 28th Oct 2007 11:57pm Re: Dump Valves [Re: Petei123]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Well usually with a stage 1 tune up alone, 110bhp is rather easy to get, so if he has done it, the other mods cant be doing much, or the tuning isnt as good as it can be.

Whats the price he's lookin to pay for the dump? If he gets a bargain, sure, go for it, but if he's lookin at standard prices, then unless he just wants to waste money, its not worth it imho.

smile

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#181680 - 29th Oct 2007 12:00am Re: Dump Valves [Re: MattLFC]
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
think on a website it was sayin 260 fully fitted.

i'm lookin at swapin my ZS for a 306 in a few weeks aswel with cash my way and could b interesed in one if they're any good, just c wat my mate says.

do they do anythin 4 fuel consumption i.e lower it?

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#181681 - 29th Oct 2007 12:05am Re: Dump Valves [Re: MattLFC]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Diesels dont run a vacume so one has to be sourced elsewhere. Not sure how the kits have evolved, but initial ones leaked boost, and lost you power, so they where more for the noise.

It will help protect the turbo, but not to the extent they do on a petrol car. As there is no vacume and throttle butterfly on a those older diesel engines, the turbo doesnt stall as violently as it does on a N/A car, so they dont get the same back pressure a petrol car does which is what damages the bearings.

Personally I wouldnt go for it, its trying to make a derv sound like petrol performance, and although it protects the turbo a little, it takes longer to fill boost pipes after its dumped the air and hence less performance.
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#181683 - 29th Oct 2007 12:08am Re: Dump Valves [Re: Petei123]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Nope, they shouldnt affect the fuel consumption much on the D Turbo noticebly iirc. I know a stage 1 tune up only knocks a couple of mpg off the average fuel consumption usually.

Is it an HDi or a DTurbo ya be lookin at? HDi got about an extra 10mpg, but not as "DIYable" as the DTurbo's.

HDi's require a remap, about 180 give or take, but will push about 120bhp when done, DTurbo's can push 110bhp doing a stage 1 yaself, ya can get upto 120 out of it from a specialist, maybe 100 or so.

Both much better value and gain then dump valves lol.

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#181684 - 29th Oct 2007 12:08am Re: Dump Valves [Re: StuyMac]
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
al show me mate this post 2moro, but its up2 him reli. lol

the 1 i'm lookin in2 gettin is http://www.pistonheads.com/sales/272906.htm

what do u guys think?

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#181685 - 29th Oct 2007 12:09am Re: Dump Valves [Re: Petei123]
turbo_stu Offline
Smartchild

Registered: 2nd Jan 2006
Posts: 665
Loc: my head
a dump valve is used to vent excess turbo boost from the intake when you shut the throttle. many manufacturers use their own re-circulating dump vavles to prevent the pst noise from being heard. some people say that the use of a dump valve can prolong the life of a turbo, and that without one the turbo can damage itself, but plenty of people manage without one, for that chatter noise.

it has nothing to do with fuel ecomony, your right foot controls that........
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#181687 - 29th Oct 2007 12:12am Re: Dump Valves [Re: Petei123]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Looks fine that, dont be put off by the mileage, the DTurbo engines will easily run past 200,000, so long as they have been looked after and reguarly services, they are pretty much bullet proof.

If the car is worth it financially, the insurance is dirt cheap on em (as standard their only group 4), and it hasnt been ragged to death, the engine purrs etc, and all seems to be correct, id go for it.

You just got me interested in DTurbo's again grin

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#181690 - 29th Oct 2007 12:16am Re: Dump Valves [Re: MattLFC]
Petei123 Offline
Smartchild

Registered: 10th May 2007
Posts: 558
Loc: Prenton
well the lad sellin it has offered me the car and 700 so am gunna take a trip down sometime this week 2 have a look, so hopefully cud have a new car within the next couple of weeks laugh

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#181707 - 29th Oct 2007 8:46am Re: Dump Valves [Re: turbo_stu]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Originally Posted By: turbo_stu
many manufacturers use their own re-circulating dump vavles to prevent the pst noise from being heard.


Recirc dump valves are used so that all measured air stays in the intake system. Say the AFM measures X amount of air, and then a load is dumped to atmosphere, as its after the AFM, the car doesnt know this, and incorrectly over fuels to car - fitting a recirc keeps all the air where the car thinks it is wink
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#181712 - 29th Oct 2007 9:56am Re: Dump Valves [Re: StuyMac]
Mark Offline


Wiki Master

Registered: 9th Nov 2003
Posts: 21085
Loc: Wirral
good stuff lads wink I'm learning loads smile
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