Bov Modification

[ROLMDL]

So what sort of noise does this BOV mod give off?

I might have to meet up with someone who is in the know on this one cos the pics all look the same to me (another mechanical nuffy).

How do you get the whistle of the turbo sounding louder?

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Its more of a flutter than a whistle, I have my bov off completly and it sounds insane.

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Compleatly off what are you doing with the plumbing. Is it back into the intake?? Wouldnt you be loosing boost.

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the std BOV plumbs the air back int othe intake.

by taken the BOV off it realse there out to atmosphere.

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So wouldnt you loose boost by doing this???. Isn the BOV there to seal the intake whilst under boost then release the pressure when the throttle closes??

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Well I dont know the dicniqcal side of things but ive tryed both

and they feel the same to me didnt loose and boost.

[J2Racing]

ok I know this has been covered over and over again ad nauseum, but I just want to double check that im reading things correctly, im ok mechanically, but not so much with the newer cars...... here is what I understand needs to be done.

1. remove crossover (labelled turbo intercooled)

2. flip upside down to access standard bov, remove east-west direction pipe (that leads into left side of the bov)

3. insert plug of some description in plumb back pipe

4. insert plug with 10 mm drilled hole into open port of bov

5. reinstall everything again

6. gun it

am I on the mark?

Edited 04/04/07 01:07 AM by J2Racing

[miker]

ok I know this has been covered over and over again ad nauseum, but I just want to double check that im reading things correctly, im ok mechanically, but not so much with the newer cars...... here is what I understand needs to be done.

1. remove crossover (labelled turbo intercooled)

2. flip upside down to access standard bov, remove east-west direction pipe (that leads into left side of the bov)

3. insert plug of some description in plumb back pipe

4. insert plug with 10 mm drilled hole into open port of bov

5. reinstall everything again

6. gun it

am I on the mark?

more or less.

but you shouldn't have to take off the crossover pipe- I didn't on mine. and I do believe there is still some conjecture over whether or not the valve lets some unfiltered air into the system............

[J2Racing]

oh ok, if I forget about the plug in the bottom of the bov and put a small filter there instead, like a monza style mentioned earlier, would this affect the loudness or sound of the bovving?

[Chief_XR6T]

W00t I get it so find the BOV which is behind the Turbo intercooler.

Then remove piping find 2 chair tips stab a pen sized and a bit hole in them both and put them both were there piping was.

So has anyone had a problem with the chair tips coming off etc?

[Dirty32]

Here are a couple of shots that I took for Jamie.

I used 1'' rubber chair tips from bunnings at an almighty cost of $2.20 for a pkt of 4!

The one to the back of the crossover pipe is like a plug and I removed the hose and drilled a 10 mm hole in the another tip make it sound better.

Then I leaned bov onto the hose that runs from the pcv valve to stop it from butting up against the other chair tip, this muffles the sound alot when they are touching.

Hey peoples... gonna give this a go today while iv got some time.

If anyone has done this mod and is on the forum please post Just to make things more clear for me, is there supposed to be 10mm holes in both chair tips or just one?? If just one, does it go on the right side or left side of where you take that middle pipe out of?? just cant see what sides have the holes in the pics???

Cheers for your help

[XR06T]

you wouldn't want a hole in the chair tip that is connected to the crossover as this is after the air filter, and sh!t could get in there = not good..

it is also possible that unfiltered air can get into the intake tract through the bov too, but im not sure on that one.. could never fully understand what f6_tornado was saying.

[IH8TOADS]

easy to understand. As the air goes into the bov it actually compresses against the side of the internal piston and not underneath it like a conventional turbosmart style valve. In other words it's mounted in reverse. So on the XR6T's the valve is opened by vaccum from the top thin tube not from boost acting against the piston. When the car is at idle or cruising at a constant speed at low revs then the car is actually operating under vacuum and not under boost. Therefore the bov it open a little bit. By opening a tad it actually sucks in air that by passes the turbo, thus making the engine about 0.000000001% more efficient. On the turbosmart dualport valves the hole that releases to the atmosphere is located higher than the hole that vents back into the intake tract. This design ensures that when the valve is open slightly at idle or cruising the air is taken from the intake tract and not the atmosphere. On the std bosch valve when the car is cruising or at idle (ie under vacuum) the air is taken from the unfiltered atmosphere (if you have done the bov mod to make some noise).

Edited 05/05/07 10:27 AM by Dagabond

[mpsxr6t]

is that also true if u put the lil filter over the other end?

[Meggs_83]

here's mine