BOV Complete delete

Zach · January 21, 2015

I've done a search and its so all over the show.

Can I pull off the BOV and block it up and have no dump valve AT ALL? Some say its bad for the turbo some say it's fine and they have done it for years. Only boosting 7psi so I don't see how it will comp surge only thing im not too sure on is when air escapes back through the compressor and making it either go still or make it go backwards while I still have exhaust going through the exhaust housing.. would this then make the shaft turbulent? Will it be hard on the seals? are bov's over rated? I really want to delete it ey.

ADIKT · January 21, 2015

It is literally impossible for the shaft to spin backwards

boon · January 21, 2015

Why do you want to delete it? Do you want your car to go zututututututu?

That's the sound of 140 feral kilowatts powering towards a pink sticker.

I don't think you fully understand how the inside of a turbocharger works...

But put it this way... yes, you still have exhaust going through the housing, powering the turbine. You also have the rotational inertia of the entire rotating assembly, which is probably around 80,000rpm. If you had a boost gauge in your pre-throttle-body intake and no BOV you would see it hit lots and lots of psi. Which your turbo is still trying to cram more air into, only it can't because the air is trying to escape through the only exit it has (past the compressor wheel, backwards). But the turbo is still trying to spin forwards. Can you imagine the happy forces on a delicate turbine shaft, and the blades of the compressor wheel, when this is going on?

I still can't imagine why anyone would want to do it though. Let alone REALLY want to.

EDIT: Maybe on a pure drag car, where you flat shift it and your motor only lasts half a dozen passes anyway?

Edited January 21, 2015 by boon

johnny5 · January 21, 2015

If you can, talk to Steve murch about it Im pretty sure hes in the against pile on BOV's

boon · January 21, 2015

Well, it actually can work kinda well if you have a really ****ing stout turbo that's built for extreme pressure ratios... for example the Holsets Steve sells are probably still on the compressor map at 45psi, in which case with no BOV you can just go on pressurising the intake, then when you open the throttle again your engine gets an instant gulp of nice compressed air. These turbos also have surge slots cut in the compressor housing so that air can revert through the turbo without going through the compressor wheel. But this requires a. not running with an AFM, but a MAP/IAT setup and b. not running some itsy bitsy IHI VF turbo where the blades start getting shaky at 25psi let alone 45.

scoob · January 21, 2015

If you don't like the sound put a stock one back on.

Joker · January 21, 2015

+1 scoob if you want to get rid of the skank whistle : go stock/plumb it back

or do you have a good reason th troll/why do you want to 'delete' a fairly standard part on almost every production turbo car in existience

Edited January 21, 2015 by Joker

Zach · January 21, 2015

That's what I ment by turbulence on the shaft. I'm running a HKS SSQ and I hate the sound. Apparently you can get a kit to recirc it? or does anyone have a recirc bov to suit skyline for sale? thanks.

Joker · January 21, 2015

GFB?

ADIKT · January 21, 2015

Oh an RB - well in that case - MAKE THE MUTHA ****KKR DOSE !!!!!

vvvvvvvv CHU CHU CHU CHU

Zach · January 21, 2015

goddamn this forum sometimes lol. **** it ill put up with the ****ty ass high pitched sound then

Joker · January 21, 2015

so you cant find a stock setup? or there'ss nothing on this page you can plumb back with

http://www.pro-wholesale.co.nz/gfb-respons-blow-off-valve-bov/

Timmah · January 21, 2015

I'm sure someone would want to swap your Bov for a stock one.

If the HKS valve is able to be tightened, you could tighten up a little bit so it doesn't go off at low PSI..

Rosssub · January 21, 2015

HKS have a sound insert bit in the trumpet, changeable for different sounds. Could try removing it completely to see how it changes?

http://www.wbperformance.com/hks_super_sqv_parts/

lachlan · January 21, 2015

put a stock one on it . they can be had for free .

sell your one for 2 boxes of beer . happy .

removing it altogether is literally more work than bolting the oem one on

slystiguy · January 21, 2015

Go down to your local 2$ shop grab yourself a couple whoopee cushions, attach to bov outlet and laugh all the way home

p.s I'm trolling but as the others said, stock turbos are big no no and ecu probably have some issue with it too? I ran mine like that for a few runs, makes it sound kinda cool on high rpm changes but not good on the turbine supposedly, in fact I think I have a video of it somewhere

Edited January 21, 2015 by slystiguy

Rosssub · January 21, 2015

Rosssub said:

HKS have a sound insert bit in the trumpet, changeable for different sounds. Could try removing it completely to see how it changes?

http://www.wbperformance.com/hks_super_sqv_parts/

Just removed my HKS sound insert and went for a drive, 90% quieter. Now instead of a high pitched PSHHHHHHHH, it's a low quiet PWOOOOOOAAAHHH.

lachlan · January 21, 2015

oh yeah . rb25det turns to **** with no bov . the air goes backwards out the afm and it doesnt know where the air is goin to it dumps in more fuel . makes it die on return to idle .

scoob · January 21, 2015

ADIKT said:

Oh an RB - well in that case - MAKE THE MUTHA ****KKR DOSE !!!!!
vvvvvvvv CHU CHU CHU CHU

Hahaha yeeeww

Zach · January 21, 2015

sound insert removed much better!! thanks all it tookwas an allen key

gotasuby · January 21, 2015

We run no bov on the rally car and have done for 3 years. No turbo failure yet. And at 22psi.they don't fail as much as people say they do

Guest · January 21, 2015

gotasuby said:

We run no bov on the rally car and have done for 3 years. No turbo failure yet. And at 22psi.they don't fail as much as people say they do

With antilag?

Zach · January 21, 2015

gotasuby said:

We run no bov on the rally car and have done for 3 years. No turbo failure yet. And at 22psi.they don't fail as much as people say they do

stock td05? those things a bricks though. How many k's in 3 years? like 1000k's?

Timmah · January 21, 2015

evowrx said:

With antilag?

Yup

VF30 Turbo.

Guest · January 21, 2015

Doesnt antilag kind of make a bov redundant?

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