I know this question has most likely been asked many times but are new to site and taking some time to disolve all this new info....

Have a 2001 Ocy VRS with a Monza atmospheric DV fitted. (just plugged the pipework that runs off to the left and joins a bigger silver pipe). Soon be ordering a Green Filter Element from Demon-Tweeks but were wondering if this DV is OK on the VRS. Have seen some Threads that appear to say that only the Recirculating Type work with the VRS....

Since fitting my DV the car does appear smoother and less Turbo lag, even though still there..... Just wanted to check that i'm not gonna damage the engine or any thing like that......

You need a recirculating DV not an atmospheric one - which is why I asked you elsewhere what type the Monza DV is. Have you read this review of DVs?

You need a recirculating DV not an atmospheric one - which is why I asked you elsewhere what type the Monza DV is. Have you read this[/url'] review of DVs?

Here we go...

i have a atmospheric DV and every thing is fine...no limp mode, or warning lights etc etc, apprently wont work if i get a remap and increase the boost..

and the statement 'you NEED a recirculating DV NOT an atmospheric one' i feel is not quite right...and doesnt answer your orginal question..

in answer to your question you will not damage your engine putting that filter on with that DV... double check with Demon Tweeks tho ..

Joel

i would not say that you needed a recirculating dv! i have tried a forge recirculating dv and a balieys dv26 both do the same job!

i have not had any problems at all with the atmospheric one and its been on the car for 4 months now!

seen last week that a company has made a hybrid dv for the skoda now which plugs into orginal ports as the oem dv

but still give's a light psssst!

chris

I'm NOT arguing for or against, but I have to ask myself why, if atmospheric valves were the norm, would VAG (in their divine wisdom), choose to install a diverter valve in the first place?

Isn't SOME form of perfomance (fuel economy, power, turbo lag) expected if the correct ECU-expected setup is NOT employed?

The reason I'm putting my oar in is that when I was looking for a new car about 15 months back, the SEAT dealer I visited mentioned that his boss had put an atmospheric valve on his Cupra R (210bhp) and had been experiencing performance drops since doing so (I knew NOTHING about Turbos back then, he just chose to mention it). He then went on to explain that the standard valve was a diverter, and that the ECU monitored all air in and all air returned etc.

That's my 2 cents

I'm NOT arguing for or against' date=' but I have to ask myself why, if atmospheric valves were the norm, would VAG (in their divine wisdom), choose to install a diverter valve in the first place?

[/quote']

Because 99.999999% of all people who buy cars want their experience to be this simple:

1. Turn Key

2. Drive Car - be pleased with performance

3. Arrive at Destination

4. Switch off Car

5. Repeat as necessary until 'Service' light comes on, then take car to local main stealer, then return to step 1.

Anything that goes hiss, bang, crack, crunch, slap, rattle, grind, whoosh or any other noise would, in the case of these individuals come under the heading 'Bad Things That Mean My Car is Broken'. :eek:

So a whooshy, whistly, pssshy atmospheric dump valve would be A Bad Thing.

Hence the factory fit quiet unassuming black plastic valve to go with the efficient, quiet, unassuming black plastic dashboard.

Because 99.999999% of all people who buy cars want their experience to be this simple:

Thanks for the answer 63, but what I was really getting at (which is difficult to read because text is vague), is that VW must have wanted the 1.8t to function WITH the diverter valve, hence NOT putting in a blow-off one (leading me to believe that the valve should be replaced with an equivalent valve of similar function).

I didn't quite see it from the angle you give above (that of a 'noisy' car), but knowing a little bit about the Germans and perfection, your explanation is more than plausible

Rich

Just to add a little salt to the DV debate, I've just found 2 articles which point out that the reason for the recirculating valve is to avoid turbo-lag, with one article going as far as to mention 'pre-spin', which I take it means that once the boost is released, freeing the turbo from back-boost, the said boost is then 'fired' back towards the turbo, getting it to continue spinning.

One of the article refers to a VW engineer and the 1.8t

Rich

http://www.canadiandriver.com/articles/gw/4cylinder.htm

http://autozine.kyul.net/html/Ford_Europe2.htm -> see RS Focus section

depends how hard your pushing the car. if pottering around then a recir will reduce lag. if giving it some 'welly' then it doesn't matter. we carried out an experiment on the punto and with the recirc valve and lower boost reduced lag - but also increased the EGT, which could be considered bad. as far as i'm aware the newer 1.8t engines need a recird because the meterhead takes into account the recycled air when it comes to the AFR. the atmo will cause the engine to run rich, which some would say is not a bad thing on a turbocharged car, unfortunately the catalytic converter won't thankyou for it.

I have had my dv26 for 12 months now with no apparent problems,car seems to suffer less turbo lag and is therefore quicker through the gears. however I wait patiently to be enlightened if i'm wrong.

Thanks for the answer 63' date=' but what I was really getting at (which is difficult to read because text is vague), is that VW must have wanted the 1.8t to function WITH the diverter valve, hence NOT putting in a blow-off one (leading me to believe that the valve should be replaced with an equivalent valve of similar function).

I didn't quite see it from the angle you give above (that of a 'noisy' car), but knowing a little bit about the Germans and perfection, your explanation is more than plausible

Rich[/quote']

You take things far too seriously

But, really, VW are not alone in using a recirculating dump valve, and all the manufacturers of turbo engines are in the same boat. Why do Subaru, Saab, Rover, Fiat, Lancia, Peugeot, Renault and others all use recirculating valves?

Because noisy engines don't sell to average people.

You take things far too seriously

Let's just say I was feeling a little 'William' yesterday

Cheers

Rich

Let's just say I was feeling a little 'William' yesterday

Cheers

Rich

I could say something but I won't

I could say something but I won't

As in 'similar to' and not 'desire', OK :P

Rich

As in 'similar to' and not 'desire'' date=' OK :P

Rich[/quote']

Something like that

you wont have trouble with a "blow off" valve on a standard car, although you will if you have it remapped. the recirc valve does what it says on the tin and on remapped cars running higher boost develop problems with blow off valves.

DaveU could tell you all about it.

Only today I was told by a colleague (who I was giving a lift) that my dump valve was too loud and annoying

But, then I have got the loudest one available for the Rover