Got Board so did a little Mod!!

[MR-GTI]

oK I'm not saying that's it's better or worst, as I have driven cars that have improved performance with and without BOV.

All I do know is that it's all "HEAR DAY".. There is no written proof or evidence that supports the fact that by not running one it will stuff your turbo.

At the end of the day each to their own, I'm merely show a mod that is easily & inexpensive to do.
If you wish to do it then that’s your prerogative.


Regs MR-GTI

[Blitzen]

oK I'm not saying that's it's better or worst, as I have driven cars that have improved performance with and without BOV.

All I do know is that it's all "HEAR DAY".. There is no written proof or evidence that supports the fact that by not running one it will stuff your turbo.

At the end of the day each to their own, I'm merely show a mod that is easily & inexpensive to do.
If you wish to do it then that’s your prerogative.


Regs MR-GTI

I agree that it is an easy mod, but in the long run, it COULD lead to being a very EXPENSIVE mod.
I'm a mechanic by trade, so I have seen my fair share of Turbo failures, Foreign Object Damage, oil starvation, and undue stress being the prime contributors to turbo failure.

http://www.streetracersonline.com/articles/turbo/bov.php

[Kai]

You will not damage your turbo by not running a blow off valve. Period. Whether it is bush bearing or ball bearing doesn't matter. The weight of the air in the intake is 2/5 of **** all and will not in any way be enough to damage the bearings or anything else in the turbo. Blow off valves were made for 3 reasons:

1. To reduce noise - new car buyers don't like a car that makes a weird fluttering noise.

2. For emissions compliance on maf sensored cars - with an atmo bov or no bov the air that has passed the maf does not enter the engine, causing the car to run rich and fail emissions.

3. To prevent compressor stall from the surge of compressed air being redirected against the turbo compressor turbine when the throttle butterfly is snapped shut.

No bov causing damage to a turbo is an old wives tale and is NOT true. Many many street and race cars have run very high boost pressures with no bov for long periods of time with no negative effects. Bovs do NOT increase performance and they are NOT required to prevent damage to a turbo. On a maf sensored car the car will run poorly on gearchanges without a plumb back bov, on a map sensored car they serve no purpose other than noise suppression which obviously isn't relevant with an atmo valve. Atmo bovs are just a good source of boost leaks and wanky sounds, nothing more.

------------------

I copy and pasted this from a reply of mine in another thread. No evidence. No care.

[Blitzen]

I copy and Pasted too...

...reason BOV's are employed...To prevent compressor stall from the surge of compressed air being redirected against the turbo compressor turbine when the throttle butterfly is snapped shut. This prevents turbo lag when the throttle is opened again, so in a sense, they do help with performance, by allowing better throttle response. Blow off valves will help on any turbo'ed car(except diesels, most of which don't use throttle butterflies). The sound may be wanky, but I like it...

But what would I know...Just comes with the job, and having to rebuild the things...

[RhysQ]

Hey KIA,

Yep that's exactly what I have done.. Disconnected the Vacc Lin off the BOV, and run the filter.

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 !!!

yeah....not too sure if you've realised.....but his name is KAI......not KIA, cheap truck and car manufacturer.

i'm pretty sure it clearly says it.

as for the whole bov thing....i don't know enough about it to take sides on the matter, but for me i'm sticking with the dual port bov i have......unless my car decides to shut down like KAI's <----(note spelling) did.

[GTIJNR]

the vac line on the bov is there for a reason... if u guys want "cooler dose" in vl's term, or flutter, then block the inlet of the bov, not just taking the vac line off which may cause boost leaking through the bov as the spring alone not enough to hold the psi.
skyline's ceramic turbo are fragile, there for die much easier than conventional steel blade. normal turbo can take a fair bit of punishment b4 wearing out center bearing. Plumback bov help throttle respond in most case, but the fluter noise sound nice so go figure...

[ranton-inc]

Question

Why disconnect it?

Its there for a Reason?

to Take the Backlog of air pressure when the TB Butterfly Suddenly shuts.. (backing up to the turbo causing resistance there fore unnecessarily slowing down the turbine (probably not so noticeable on a car that that a thimble sized turbo charger i know i used to have one)

The other reason that the Blow off valve is plumbed back in to the intake.. most of you guys will realise that your cars have those pain in the arse Sensors at the start of the intake Tract!

that measures how much air has passed thru it right?

Now for egsample if the Car measures 5 litres of Air pass thru that sensor, it goes ok with my super advanced fueling abilitys.. i need x amount of fuel for the 5 litres of air that has come in.. if you eject say a litre or 2 of that air upon throttle off before it has a chance to visit the combustion chamber.. the car is still expecting it.. (yes it will be there because the turbo will serve out the next lot of air blah blah blah.. but its not the logic the computers always think with..

this is why if you vent to atmosphere most of the time the CEL is thrown!

but still nice looking engine bay.. get some Samco hoses in that bad boy..

however.. one more critisisim..

check out www.evoms.com.. have a look at their V-flo intakes..

a pod filter under the hood is all very well inhaling hot air from around the engine bay defeats the purpose of the intercooler.. the car has to work twice as hard..

the V-flow intake is heat sheilded and has a venturi to create an acceleration effect on the air being inducted.... it will sound good too.. oh and i forgot its heat sheilded..

here is a pic of the mkIV one it should fit a mkV polo GTI http://www.evoms.com/Pictures/ProdIm...7600E4B%7D.jpg

I run a EVO MS Long Ram intake.. i just run the risk of Hydrolock if i run over a puddle as my airfilter is down by the ground.. it sounds effing good thou...


Peace Brother

Take Care fore now!

[Flaps]

It's your car do what you want.