dump valve

[graemer101]

hey i own a a3 1.8t 150 bhp and want to fit a dump valve. what one do i buy nothing too loud. do i need a fitting kit too? please help

[sumanb82]

hi,

your 1.8T should already have the OEM Bosch dump valve fitted, but these are known to fail.

I suggest looking at Bailey or Forge. I think it is best to get a recirculating dump valve, unless you have really pimped up the rest of your car with engine improvements.

I have the bailey DV30 which is noiseless but does a good job.

[Space Cadet]

As above, go for a recirculating dump valve and only bother doing this if your OEM is on its way out or you re-map the engine or fit a larger turbo.

Atmospheric dump valves are for mega-horse-powered skylines etc where they need to ‘dump’ the pressure so as not to wreck the turbo/engine.

On a 150bhp 1.8t it’s worthless and from what I’ve read would actually loose you some power.

It’s only my opinion but they sound really chavvy, not sure why you would want to do that to a cool A3.

Save your money and have it remapped!!!!!!!

[mluton]

I love the noises.

I have a forge 007 DV, and this has a nice suttle sound. Not loud and silent at low RPM.

I also have a Carbonio CAI and the combination gives off a great Sucking Growl and a lovely Tssssssssss on releasing the throttle at mid to high RPM.

[Space Cadet]

Don’t know which DV that is, but if it’s an atmospheric then see above.

And induction kits in general and especially on VW/Audi’s are a no-no, they risk messing up the air-mass-meter and to get so low down as to pick up the cold air you risk also picking up puddles/rain - unless you’re after huge power its best to stick with an uprated panel filter.

[hitenv]

Agreed. A recirculating dump valve works for me. Mind you, i'm not the type who needs to have atmospheric dump which goes 'pssssshhhh'
My £0.02

[ashleytinman]

Forge do a recirculating and atmospheric dump valve in one not sure if they are any good but looks pretty cool.

[mluton]

Don’t know which DV that is, but if it’s an atmospheric then see above.

And induction kits in general and especially on VW/Audi’s are a no-no, they risk messing up the air-mass-meter and to get so low down as to pick up the cold air you risk also picking up puddles/rain - unless you’re after huge power its best to stick with an uprated panel filter.

Its the oil on the filter tht can kill the MAF. As long as you dont over oil, youll be safe, as i do. There are filters that dont require oiling that are suitable.

And just make sure you dont go through a big puddle.:biglaugh:

[hitenv]

Maybe take a look at the recirculating valve that AmD Teknik supply. Will give an idea of what, how, where, etc
Thats what i did....

[ashleytinman]

Ive just got the forge " The Splitter, a Recirculation and Blow Off Valve" which seems to work well and it isnt to loud when it dumps either.

[Space Cadet]

Maybe take a look at the recirculating valve that AmD Teknik supply. Will give an idea of what, how, where, etc
Thats what i did....


Had all the work done on my old MK4 GTI 1.8T at AMD when they were up in Bicester. Had their recirculating DV fitted as a precaution when fitting a larger turbo and all the bits.

[ashleytinman]

What things have you done to your GTi then?? How much Bhp have you now got??

[Space Cadet]

When I said old, I meant old to me – I got rid of the car a couple of years ago (have had about 6 cars since then) to a friend who runs a motorsport garage.

Still see it occasionally and the friend has tinkered with it a bit more.

It had about 250bhp which doesn’t sound a lot nowadays but out of a non-S3/TT version 1.8T isn’t bad unless you go for a new exhaust manifold and even larger turbo.

In short - It had a hybrid turbo, all the hoses, a Forge front-mount intercooler, Pipercross panel filter (tried a Carbonio but it sounded **** and was also advised to take it off). Uprated springs and adjustable shocks, antiroll bars etc etc. Porsche Turbo callipers/discs and pads hoses/fluid etc on the front and upgraded discs/pads/hoses on the rear. Full Miltek exhaust with high-flow cat and rear ‘4-Motion’ looking rear-box and valance (the GTI’s exhaust used to point down and have a solid rear valance). Put a matching 4-Motion front valance on, de-badged it with 18’ RS4 wheels. Interior left pretty much as standard apart from replacing all the dodgy wood with plain black and fitted a massive install in.

I truly loved that car, it went like stink, handled fantastically and stopped on a dime. It wasn’t raw at all as I had it set up fairly soft and it was happy just to cruse around town if wanted.

Have had many faster/more powerful cars since, but it will always stick in my memory as one of my favourites!!

[ashleytinman]

You might be able to help me then i've got an Bmc air filter its the carbon one and looked today thinking of fitting it and realised there is a other set of wires coming out of the air box are there to an other air mass meter or what???? how can i fit my induction kit with out the wires in the air box and what would it do if i did??? Did you notice any difference when you fitted a panel filter and did it make any difference in sound.

[mluton]

You might be able to help me then i've got an Bmc air filter its the carbon one and looked today thinking of fitting it and realised there is a other set of wires coming out of the air box are there to an other air mass meter or what???? how can i fit my induction kit with out the wires in the air box and what would it do if i did??? Did you notice any difference when you fitted a panel filter and did it make any difference in sound.

Wires or a pipe ?

There is another pipe, which you can put a breathe filter on. This is my filter setup:
http://i132.photobucket.com/albums/q8/Lutons/STA41174Small.jpg

[ashleytinman]

Ive got the normal air mass meter thats shown in your pic but ive got some wires coming out of the air box to on the far side of the box??????? Which air filter have you got and what do you think of it?????

[mluton]

Ive got the normal air mass meter thats shown in your pic but ive got some wires coming out of the air box to on the far side of the box??????? Which air filter have you got and what do you think of it?????

I have the Carbonio setup, got it from Awesome GTI. Love the noise it makes and compliments the forge 007 nicely.

[Jo308]

I have been using the Forge on my 180 TT for over a year and it has been very good. Not too noisy and does the job smoothly. The OEM Bosch had split so I went for the piston version replacement.

[silver-sentinel]

If you really want to replace the DV, go for A forge DV. If you are after the TSSSSSSH! sound, I would go for the Forger Splitter.

Just remember that Atmospheric DV will hamper performance in the A3 1.8T , u will also find much more lag. So rather go for a Forge recirculating DV

Otherwise remap the ECU rather, ur OEM DV will be a little louder andswoosh like a MOFO!
:beerchug:

[Space Cadet]

This is exactly what I have heard and previously posted, atmospheric DV’s are for big bhp monsters where they need to ‘dump’ the pressure, not for 1.8/2.0T’s. I only know this from a friend donkey's years ago who took his Cossie to big power and actually tested the difference between the two, the atmospheric lost him power. Have also heard this from other sources.

Plus IMO they sound awful!!

[SDO]

how do you know if your dv is broke

[Space Cadet]

As far as I know if they are broken its because the diaphragm ruptures, in which case it would either not hold the full pressure in, or would just constantly vent the pressure and you would subsequently loose some of/all of the effect of the turbo.

I don’t believe it could actually stick closed, in which case your turbo would shatter because as soon as you eased off the throttle and the turbine had stopped spinning (lets say clockwise) the pressure not vented would immediately start it spinning the other way (anti-clockwise).

[SDO]

think mine is broke as it keeps going woosh every time i come off the throttle

[Space Cadet]

Ah, doesn’t sound like yours may actually be broke, sounds like you’ve got a chavy ‘Atmospheric’ DV rather than the standard fit and preferable ‘Recirculating’ DV.

Speak to Forge and tell them what engine you’ve got, what power its pumping out (or is likely too for the foreseeable future) and ask for a decent Recirculating DV.

[SDO]

Thats just it the dv has never been replaced and is a standard unit

[Space Cadet]

In which case replace with either a new OEM, or an upgraded one from say Forge.

[1staudiA3]

What is an OEM ? does have a dump valve increase BHP?
i might get one fitted if it increases the BHP?

[mluton]

What is an OEM ? does have a dump valve increase BHP?
i might get one fitted if it increases the BHP?

Original Equiptmant Manufacturer, Standard one in other words.

DV's do not increase BHP.

[1staudiA3]

i wanna increase BHP got any tips apart from Remapping ?

[Niklock]

You might be able to help me then i've got an Bmc air filter its the carbon one and looked today thinking of fitting it and realised there is a other set of wires coming out of the air box are there to an other air mass meter or what???? how can i fit my induction kit with out the wires in the air box and what would it do if i did??? Did you notice any difference when you fitted a panel filter and did it make any difference in sound.


I found this on mine, so i ordered a induction kit from jabba, the wires you are on about go to a temp sensor( i think )so it has to be mounted by the filter mine goes on the metal panel which stops the heat getting in the filter. I aint had any probs yet, and i'm sure the BMC set up should work well with the sensor fitted close by.

I had the same problem, no one wanted to tell me what it was for thats why i went to jabba sport. But knowing what i know now i would have gone for the BCM. Good luck.

Nick:biglaugh:

[Niklock]

Oh by the way i've gone for the forge splitter valve it works well and i'm going for the remap soon too.

[ashleytinman]

:wiggle: Cheers mate i went for a pipercross panel filter in the end but i could still change it. I might bring it to the re map and decide on the day what to do. I was happy with the splitter to have you adjusted your at all??? i tightened mine a few clicks