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Rb20 Bov / Vacuum Question

cassio
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cassio Rookie

cassio

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Hay guys,

Ok so when i bought my car it never had a blow off valve installed, just a blanking plate over the stock bov location.

post-69701-1272416877_thumb.jpg

post-69701-1272416908_thumb.jpg

This is how it was, see the 2 nipples coming out of the intake manifold have been circulated.

I took the top one (the one you can see best) and connected it to my new bov, and just plugged up the bottom one.

Is this correct? is this a vacuum line? what were these lines used for as stock?

and i have taken the car for a drive with the bov in and it sounds exactly the same as it sounded with the blanking plate.

Any help or advise would be greatly appreciated, Thanks guys.

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mad082 Grand Master

mad082

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how tight is the spring in your new bov? if it is too tight and you are running low boost then you might not have the pressure to open it properly, or it will just flutter as it doesn't have enough pressure to force all the air out in 1 go.

cassio Rookie

cassio

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how tight is the spring in your new bov? if it is too tight and you are running low boost then you might not have the pressure to open it properly, or it will just flutter as it doesn't have enough pressure to force all the air out in 1 go.

I first tried it at the level it came at, i would say 50% tightness, and then i tightened it up to about 75% but is still exactly the same as when i first put it in and is the same as no bov.

Do you know if that is connected to the right vacuum lines?

Thanks

mad082 Grand Master

mad082

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yes that is a vaccum line. it doesn't matter which vaccum line it is connected to as long as it is a vaccum line.

also making the spring tension tighter will only make the problem worse. that is like trying to push a car and not being able to move it very fast so having someone pull up the hand brake to see if that helps.

loosen the bov off as much as possible and see what that does.

might also be worth checking to make sure that there isn't something inside the hose that is blocking it. take the hose off and try and look through it.

also pull the bov off and make sure you can push the valve up by hand and that it isn't siezed. if it is brand new then there is a possibility that it was shipped with 2 springs in the bov, meaning that it is extremely tight and hard to open and you aren't running enough boost to open it.

cassio Rookie

cassio

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yes that is a vaccum line. it doesn't matter which vaccum line it is connected to as long as it is a vaccum line.

also making the spring tension tighter will only make the problem worse. that is like trying to push a car and not being able to move it very fast so having someone pull up the hand brake to see if that helps.

loosen the bov off as much as possible and see what that does.

might also be worth checking to make sure that there isn't something inside the hose that is blocking it. take the hose off and try and look through it.

also pull the bov off and make sure you can push the valve up by hand and that it isn't siezed. if it is brand new then there is a possibility that it was shipped with 2 springs in the bov, meaning that it is extremely tight and hard to open and you aren't running enough boost to open it.

Yeh, thanks mate, ill loosen it right off and see how that goes, i dont think it would be the hose as its brand new, but i do remember just mucking around and trying to push the valve open with my hand and it not budging i didnt take much notice at the time as i thought it just didnt work that way, but i will look into it.

Thanks

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