Spec me a Dump Valve

Entai · 12 Dec 2006 at 07:51

silane said:
....snip....

Also the car didn't come with a d/v so I see no need to add one - surely Renault would have done so if it was needed.

ALL Renault Turbos come from the factory with a bosch recirculating valve fitted as standard.

playworker · 12 Dec 2006 at 11:00

Entai said:
I know from experience even taking the standard recirc off an Audi A3 1.8 turbo, and just piping up straight, resulted in bits of compressor housing and blades being dug out of the bonnet, bulkhead, and surrounding areas after about half an hour of hard driving.
The whole housing and turbine grenaded itself due to compressor stall. because of the increased back pressure on accelerator lift off.

Must have been something wrong with the turbo for it to do that dude, there's no way that just removing the DV will cause that. I've run 1.4 bar for thousands of miles with no DV and the turbo didn't explode into little pieces. S13s don't have any form of DV from the factory running 10psi and the turbos last as long as on any other car. The compressor doesn't actually stall anyway, the noise is the air being forced back through the compressor blades, the speed of the turbo which is spinning at some ridiculous rpm isn't massively affected - it might slow slightly but it definitely won't stop dead.

EddScott · 12 Dec 2006 at 11:31

Turbo damage caused by no DV can happen but it depends on the state of the turbo and indeed manufacturer.

I know with Subarus, Mitsubishi TD series turbos take a fair amount of punishment and seem happy to run without a DV. The IHI series (VF) aren't as robust and can die pretty quick with no DV.

BigglesPiP · 12 Dec 2006 at 11:33

You'll be needing a set of exhaust valves some time down the line if you go for the dump valve.

Stonedofmoo · 12 Dec 2006 at 11:46

It's a modern Saab
Do NOT use an atmospheric dump valve with the T7 ECU. Full stop

If you want a hissing chav car then buy a Renault 5!

The_Dark_Side · 12 Dec 2006 at 12:48

Stonedofmoo said:
a hissing chav car

...pretty much sums up my thoughts on the subject.

Phate · 12 Dec 2006 at 12:51

Stonedofmoo said:
Do NOT use an atmospheric dump valve with the T7 ECU. Full stop

Is there a technical reason for this? or simply the fact that you don't like them?

if people tell me not to go for it I want a technical reason to it

not just the fact that chavs have them.

agw_01 · 12 Dec 2006 at 12:52

Did you have a dump valve on your Pulsar stoned?

I'm seriously shocked at how the hell dump valves have been assigned a 'chav' link.

Bear · 12 Dec 2006 at 13:05

agw_01 said:
Did you have a dump valve on your Pulsar stoned?

I'm seriously shocked at how the hell dump valves have been assigned a 'chav' link.

Probably due to the fact they do nothing but make a noise. If the car has a recirc but someone has taken it off to make the car potentially run worse and to make a noise then its pretty pointless other then a look at me type mod which some people would class as chav.

ci_newman · 12 Dec 2006 at 13:10

agw_01 said:
Did you have a dump valve on your Pulsar stoned?

I'm seriously shocked at how the hell dump valves have been assigned a 'chav' link.

Dump valves as a whole haven't been labelled as chav. Dump valves which make huge great big hissing sounds when changing gear (despite the complete lack of power in the car) are labelled chav.

Likewise, big powerful engines with loud exhausts are drooled over whereas a Corsa with a great big tail-pipe which rattles the floor when it drives past is just plain daft (The way I see it anyway).

Noisy cars need to have the power and the presence to justify it's noise level. It's silly, i know..

agw_01 · 12 Dec 2006 at 13:11

So does that make me a chav for fitting a bigger (albeit quiet) exhaust on my car?

I just think it's a bit much to call a dump valve a chav item, when not many chavs can afford a car to accomdate a DV.

ci_newman said:
Dump valves as a whole haven't been labelled as chav. Dump valves which make huge great big hissing sounds when changing gear (despite the complete lack of power in the car) are labelled chav.

Where did the whole 'lack of power' thing come from?

Phate was asking about dump valves on his 2 litre, ~180bhp engine. I wouldn't exactly call that a lack of power. Same with an MR2 turbo or Scooby WRX... they both have over 200bhp... no lack of power there.

Whereas a 130bhp Punto GT Turbo, yeah ok, maybe that's a bit pointless, but still fun all the same.

Not having a go or anything, just interested as to why people think DV's are silly.

Entai · 12 Dec 2006 at 13:12

playworker said:
Must have been something wrong with the turbo for it to do that dude, there's no way that just removing the DV will cause that. I've run 1.4 bar for thousands of miles with no DV and the turbo didn't explode into little pieces. S13s don't have any form of DV from the factory running 10psi and the turbos last as long as on any other car. The compressor doesn't actually stall anyway, the noise is the air being forced back through the compressor blades, the speed of the turbo which is spinning at some ridiculous rpm isn't massively affected - it might slow slightly but it definitely won't stop dead.

It was a brand new unit straight out of Turbo Technics workshop, the next two units did exactly the same thing untill we put the recirc valve back on.

If you mean the S13 engine fitted to Nissan 200SX's etc then sorry but they came as standard from the factory with a recircuating valve as standard factory fit, or so the FAQ's say at 200SX.org!!
See here, click on Enhacements in the menu on the left then look under the explanation for "BOV" - Blow Off Valve.

divine` · 12 Dec 2006 at 13:13

agw_01 said:
Did you have a dump valve on your Pulsar stoned?

I'm seriously shocked at how the hell dump valves have been assigned a 'chav' link.

Because virtually every time I hear (and im guessing most people) a 'psssttttcccchhh' sound, I inevitably turn around and see a what remarkably resembles a chav driving whatever car it happens to be...

Can't remember the last time I saw a decent car that looked like it was cared for with a DV on it.

Entai · 12 Dec 2006 at 13:14

Entai said:
It was a brand new unit straight out of Turbo Technics workshop, the next two units did exactly the same thing untill we put the recirc valve back on.

Compressor stall does not mean that it will stop dead, it just means that you are forcing air into the unit from the wrong direction so the blades are chatering against the forced air.The compressor unit is not designed to be fed from the outlet and damages delicate internals if that is what you do.

If you mean the S13 engine fitted to Nissan 200SX's etc then sorry but they came as standard from the factory with a recircuating valve as standard factory fit, or so the FAQ's say at 200SX.org!!
See here, click on Enhacements in the menu on the left then look under the explanation for "BOV" - Blow Off Valve.

Phate · 12 Dec 2006 at 13:18

Did you just quote yourself?

agw_01 · 12 Dec 2006 at 13:20

divine_madness said:
Because virtually every time I hear (and im guessing most people) a 'psssttttcccchhh' sound, I inevitably turn around and see a what remarkably resembles a chav driving whatever car it happens to be...

Can't remember the last time I saw a decent car that looked like it was cared for with a DV on it.

Not for me. I've seen one Punto GT Turbo, a few Starlet Turbo's, a few Rover Turbo's and the rest have been Skylines, Imprezas, Evos... etc...

I definitely see more turbo'd jap cars than Punto and Rover Turbo's.

Phate · 12 Dec 2006 at 13:22

agw_01 said:
Not for me. I've seen one Punto GT Turbo, a few Starlet Turbo's, a few Rover Turbo's and the rest have been Skylines, Imprezas, Evos... etc...

I definitely see more turbo'd jap cars than Punto and Rover Turbo's.

Theres a few clios around here with dump valves, and some that just sound stupid.

But there are a couple of scoobys, the occasional evo etc and with a dump valve to me just proves a point that they are fast

playworker · 12 Dec 2006 at 13:24

Entai said:
If you mean the S13 engine fitted to Nissan 200SX's etc then sorry but they came as standard from the factory with a recircuating valve as standard factory fit, or so the FAQ's say at 200SX.org!!
See here, click on Enhacements in the menu on the left then look under the explanation for "BOV" - Blow Off Valve.

S13 is the chassis code, all UK S13s come with the CA18DET engine which does not have any form of BOV/DV. Trust me I own one

The later engines (SR20DET) are fitted with a recirculating BOV but they tend to leak over a certain pressure so are frequently binned with no exploding turbos to be seen

You are correct in that the air passing back through the compressor will put extra loading on the thrust bearing if it's a journal bearing type turbo but at worst this will take a couple of thousand miles off the life of the turbo over a lifetime.

Axeboy · 12 Dec 2006 at 13:25

My bit:

If you want a vta DV then get a Sard R2D2, quite a deep sounding unit but very well made and extremely cheap.

If you want a higher pitch sound then the HKS SSQV isnt bad, but usually commands a high retail price.

However, you'll get bored of the noise quickly and I suggest a recirculating BOV to replace any exisiting one which may be prone to leaking.

Forge make decent recircs, but recently I have fitted a Perrin Recirc Valve for a WRX scooberoo, and it works very well.

Other than that, just blank all the pipes off and scare the children. Many MLR members have done this for years on end without turbo issues. I have tried it, but resorted back to the recirc due to lack of experience in removing DV's on my car. For note, performance 'felt' better, but this could have just been played by the part of the noise....

agw_01 · 12 Dec 2006 at 13:26

Phate said:
Theres a few clios around here with dump valves, and some that just sound stupid.

But there are a couple of scoobys, the occasional evo etc and with a dump valve to me just proves a point that they are fast

Are you sure you guys aren't hearing the fake dump valves on all these little chav shopping trolleys?

I saw a black modded Corsa trying to follow an Evo once. The Evo went past and dumped... the Corsa went past and farted