MK4 GTI 03 blow off valve question

[Scooter]

Does anyone know if it's legal/possible to put a very small BOV on the GIT? I know it sounds ****y, but I kinda always wanted a small woosh. I hear cars with them everyday and I know they are illegal to some extent, but not sure how they keep it legal.

Scooter.

[h100vw]

Does anyone know if it's legal/possible to put a very small BOV on the GIT? I know it sounds ****y, but I kinda always wanted a small woosh. I hear cars with them everyday and I know they are illegal to some extent, but not sure how they keep it legal.

Scooter.

I think the short answer is that the atmospheric DVs are illegal. A number of people have had running issues with full atmo valves and I would not recommend anyone run one for that reason.

You spend $xxx on one and then have to spend more to fix the problem.

I have a Green Cotton Twister on my S3 and you can hear the Forge DV do it's thing on that. In fact it is pretty loud inside the car, if you come off the throttle quickly.

It's a good bet that the std DV died long ago, so I'd say get a replacement one anyway. They don't usually cause a fault to register.

You can test them easily.

Gavin

[Lito]

as gav said 1.8ts (or any maf car) will not run well on an atmospheric bov. if u want the woosh just get a pod filter or cai it will make quite a loud sound especially with the stock metal turbo inlet pipe. i have a vid up on youtube demostrating how mine sounds but i cant figure out how to link videos

edit: hope that works

[Blitzen]

Forge does a Diverter Valve that both diverts boost air to 30% atmosphere and 70% intake. I had only on my Polo GTI with no issues, but I now have a Forge 007 DV that is 100% intake, which is louder that the Splitter. The stock DV is pretty weak, and worth replacing with a decent aftermarket one.

[Givemecoffee]

The '99 GTI I have just purchased has a full atmo BOV, does this mean the car would run better with the std plumbed diverter reinstalled?
I would like to change it regardless, as I'm not really into the noise it makes.
They missed this on my RWC too...

[h100vw]

The '99 GTI I have just purchased has a full atmo BOV, does this mean the car would run better with the std plumbed diverter reinstalled?
I would like to change it regardless, as I'm not really into the noise it makes.
They missed this on my RWC too...

If it seems to run ok now, there's probably no benefit from fitting a recirculating one. I'd offload the atmo on anyway though.

Ebay ones for $60 work ok IMO. I have a few on the shelf, if you want one quick.

Gavin

[VDUB-BUD]

a short ram air filter kit will make the DV psssh sound more noticeable, i took mine off and went back to the standard air box cause it was too loud. Though a open air filter is illegal as well.

[kapowww]

Does anyone know if it's legal/possible to put a very small BOV on the GIT? I know it sounds ****y, but I kinda always wanted a small woosh. I hear cars with them everyday and I know they are illegal to some extent, but not sure how they keep it legal.

Scooter.

The '99 GTI I have just purchased has a full atmo BOV, does this mean the car would run better with the std plumbed diverter reinstalled?
I would like to change it regardless, as I'm not really into the noise it makes.
They missed this on my RWC too...

You guys could swap. Woah. Omg.

On my 1.8T I had a Go Fast Bits Hybrid BOV which you could change to full reciric, full vent to atmo or 50/50. It was a pretty sharp "psshhh" though but you could adjust it down.

[BL33SU]

i have always used a full atmo bov.. it does make my revs abit jumpy on idle sometimes but im not worried..

[VR6man]

My GTI has a BOV from previous owner, will be replacing it with a 225hp Audi TT diverter valve.
Last car was noisy, flutter here and pshhhh there lol.
Novelty wore of quickly as did the unwanted attention.

[Scooter]

Thanks all for your help! These are all new terms for me lol. Learning a lot.
I think my best option is to take it to a performance shop and they can also help recommend something. I don't want the car to sound like a twat has done it up, just a little something extra to make it that litte more petite

Scooter

[Blitzen]

Yes... A performance shop, where they will charge you tho highest price for little gain... Jump on the Forge Performance website and have a look...

[MK4Golf]

Mine has a HKS SSQV from previous owner. I may sound a bit noobish but what's a diverted valve? I'm looking at changing to something a little less obvious.

[VR6man]

Diverter valve recirculates the boost back into the intake when you get off the throttle, like a plumbed back BOV.

[JustCruisn]

A lot of people have used the Forge 007 DV.
It is simple enough DIY, just make sure you have some rubber/silicone tubing for the actuator line (goes at the top) as the original will probably have perished and will break.