Got Board so did a little Mod!!

[MR-GTI]

Hey all,

As tittled, I got a little bored yesterday so I did a little mod, that took about 15mis to do..

My other car is off the road for a while, so I ripped the K&N off to see if it would fit my GTI, and sure enough it did with ease..

I disconnected the BOV, (1min Job) attached the K&N on and a smaller filter for the other breather, and WALLA all done.

It gives an awsome flutter on decell and load suction on throttle, as well as the spooling noise is more defined..

Not a bad little mod simple as and inexpensive..

Here are 2 pix - Second pic is off the breather filter tucked under the cover ..




Regs MR-GTI

[Kai]

If you block the vacum line. And the 2 BOV lines. Its a hell of alot louder.

Then if you wanna make it even louder. Take the airfilter off

Ive had mine like this for agessssss. (with air filter)

[MR-GTI]

Hey KIA,

Yep that's exactly what I have done.. Disconnected the Vacc Lin off the BOV, and run the filter.
The flutter is much more obviouse and and by running the K&N, makes it sound alot louder.
Prob with The GIT's is there is heaps of sound proffing in the bay which drowns the sound by alot.

Regs MR-GTI.

[MR-GTI]

Yeah that is exactly what I have done..

Just disconnect the Vac line that goes to the BOV,then Block it off (the vac line that is)

This stops the BOV from working allowing all the compressed air to pass back through the intake pipe and back out through the turbo causing the Flutter sound.

If you run a Pod filter or open filter, it will make the intake sound louder, as well as the Flutter and the whistle.

Very simple mod, and makes a small difference .

Regs MR-GTI

[Kai]

*waits for bandwagon of people to come in with all the evidence of there friends friends dogs mums boyfriend saying that it fusks your turbo..*

[MR-GTI]

My exact thoughts..

Lets see ...hahah

I have been running no BOV on my other car for7yrs, running 20psi, and still the same turbo...Not a prob.. but lets see how many will try to say differently.......

Regs MR-GTI

[SoVeReIgN]

*waits for bandwagon of people to come in with all the evidence of there friends friends dogs mums boyfriend saying that it fusks your turbo..*

It does **** your turbo and I'd only recommend doing it if you have enough spare dosh to cover parts and labour for a new turbo (not cheap)

When the blades are spinning at 100,000+ RPM, the force back over the blades is rediculous and it won't take long before you get some play in the shaft.

Look at the dosing VL turbo guys, they all **** their turbos over time.

[Blitzen]

Hehehehe...But the sound of the turbine blades bouncing off the turbine housing sounds cool.
Seriously though, I'll jump on the bandwagon of guys advising against this. It is extremely bad for your turbo.

[Kai]

It does **** your turbo and I'd only recommend doing it if you have enough spare dosh to cover parts and labour for a new turbo (not cheap)

When the blades are spinning at 100,000+ RPM, the force back over the blades is rediculous and it won't take long before you get some play in the shaft.

Look at the dosing VL turbo guys, they all **** their turbos over time.

Maybe cause VL's are quite old?

Ive been doing it on all my cars for years now. Never ever had a problem. I tested my turbo on the polo for shaft play and there was none. No visible damage to the blades either.

Never had any troubles ever. Its just been a myth for a long time with no proof as far as i see it.

[MR-GTI]

Ok..

This topic always starts different opinions..
And I respect each an everyone’s opinion based on either your own or others experience.

I agree with Kia, I have owned many turbo cars some with some without BOV, and I have only ever blown 2 turbos, once was due to sucking in the
E-Boost Vac line through the front and demolished the turbo and the
2nd was due to too much oil pressure, and it just blew the ass out of the bearing case !!!

Apart from that no other issues.

Now I have a question to all the NON BOV people..
With a BOV such as the one on the Polo's and 99% of OEM Turbo cars, you will all agree with me that they DO NOT vent to the atmosphere...Correct??

So where do you think it vents too ??

Just thought I would ask..

Regs MR-GTI

[insanekiwi]

If you read through this thread carefully...

1) Kai -> becomes KIA or Killed in Action.

2) GTI -> becomes GIT... all of us are driving around in our GITs.



Just found it quite funny... no offence to anyone!

[Blitzen]

Now I have a question to all the NON BOV people..
With a BOV such as the one on the Polo's and 99% of OEM Turbo cars, you will all agree with me that they DO NOT vent to the atmosphere...Correct??

So where do you think it vents too ??

Its true that it doesn't vent to atmosphere (unless you have fitted a Duel Port BOV like mine, however, the atmospheric port is only about a third of the size of the intake side port on the BOV, hence the majority of the unused charge air is diverted into the intake side of the compressor for the turbo), but the OEM Diverter Valve diverts ALL of the Turbos charge air to the INTAKE side of the Turbo, hence there is no undue back pressure on the compressor side of the Turbo.
If a Diverter/Blow Off Valve is not used, the unused charge air that is produced when the throttle valve is snapped shut has nowhere to go, which is why you get that "fluttering" sound on gear change/deceleration. This is the Turbo "stalling", and attempting to slow down from approx 100,000 RPM to a fraction of this speed. This "stalling" causes massive undue pressure on not only the compressor/impeller wheels, but also the seals and bearings within the Turbo.
A case in point is my house mates RB25DET Skyline. When he did the same practice as the above posts, his turbo lasted just over 3000KM before the compressor turbine parted company with the shaft, breaking off 5 of the blades, and destroying not only the Turbo, but the Intercooler piping up to the Intercooler, and the Intercooler end tank too.
This just the experience I have have had with this practice.

[SoVeReIgN]

Ok..

This topic always starts different opinions..
And I respect each an everyone’s opinion based on either your own or others experience.

I agree with Kia, I have owned many turbo cars some with some without BOV, and I have only ever blown 2 turbos, once was due to sucking in the
E-Boost Vac line through the front and demolished the turbo and the
2nd was due to too much oil pressure, and it just blew the ass out of the bearing case !!!

Apart from that no other issues.

Now I have a question to all the NON BOV people..
With a BOV such as the one on the Polo's and 99% of OEM Turbo cars, you will all agree with me that they DO NOT vent to the atmosphere...Correct??

So where do you think it vents too ??

Just thought I would ask..

Regs MR-GTI

They vent back into the intake - Whats the significance?

Are you both suggesting that there will no extra wear and tear on your turbo by running with no BOV?

Besides wear, the air running back over the blades means it'll take longer to spool back up (ie - increased turbo lag.. resulting in a slower car.)

[Mischa]

this thread delivers

[shaneth]

this thread delivers

Sorry mate but honestly what was the point posting that.