bov mod

[TTT]

here is a free mod that you can do to your standard skyline bov which will improve your throttle response..

if it has been posted before, then too bad..

I have found a mod that can be done to the standard skyline bovs to make the car a little more responsive without any side effects.

What you will feel is that the boost will come on quicker and the bov will not release till a little later.

meaning that you won't have that constant re-circulating sound you get with the standard bov.. (this sound is heard more if you have a pod filter..)

here is what you do..

take the standard bov off.

look at the bottom of it..

you will see the piston on the hole, then a small hole next to it.

you will need to find a small screw that will fit the hole.

the screw needs to have a FLAT head so that it doesn't protrude too much above the bov plate.

What I did was found a flat screw which fit in the hole easy, then I wrapped it in that plumbers tape (the white stuff) until it was fat enough that it had to be screwed in.

once in, I used some super glue on top to make sure that it is completely on there..

let it dry, put the bov back on and go for a spin..

You should be able to feel the difference..

no more KW's but I think that it comes on boost a lot quicker and doesn't release so early like a standard one does.

if you have any questions or want help doing it, then let me know.

the pics below are not mine but it shows what I am talking about..

[Dawzey]

so does it get rid of the sound u hear throu the air filter or does it just bring it on later??

cheers

[Gester]

Why would they make the hole in the first place? Other then that thanks for the guide helped a fair bit!

[TTT]

it doesn't get rid of the sound.

it just doesn't circulate the air unless you are like 10 in to the vacuum side of the boost guage..

normally, it will circulate the air at even just above 0..

this is all according to my boost gauge..

plus the spool up of the turbo is much quicker.

You will still hear the swoosh sound between gears and it will still re-circulate the air.. as it should..

but it just makes the car nicer to drive.

as for why the hole is there in the first place?

I'm not sure..

probably so that the bov doesn't have to open to circulate the air at normal cruise speeds/boost levels.

[dabigbolf]

thanks heaps for that. i am not going to do it, till i get the car started, so i can tell if it makes a difference.

why do nissan put it there, same question i have about why they have the throttle body in the position they do. should be at the front, makes cooler piping waaaaaaaay easier.

should have a front mount too.

thats just my bitch.

but good bov idea.

[Skyrine-Dave]

i did this mod thiss morning and removed it about 15mins later.

on about 10IN-Hg to 3psi you get the air reversion flutter noise

but once on boost and you change gears of snap the throttle closed you get a combined flutter and half ass 'psssht' bov noise. Made the car sound like something was wrong with it. I dont know if it was just my bov but it didnt sound too good.

[TTT]

that is definitely weird..

my one worked just fine and still is..

so you did exactly as the pics above?

[Skyrine-Dave]

haha yep followed them .. pretty easy to do...

the screw was in there tightly, with plumbers tape wrapped around... i had to force the thing in, so it was very tight and secure.

it had a nice flutter on low spool, but once i stomped it abit and let off it had a flutter mixed with the pssht at the same time... kinda sounded like the bov was dying

and i do have a r32 rb20det, so its not a NICS engine problem

maybe the vale has a weak spring in it... i dunno i just took the screw out

[TTT]

hmm.. oh well.

it's worked on mine and a couple of mates one..

so maybe you're special..

hahaha

[Gester]

lol well I ****ed mine completely. I put the screw there, it was fine. then it sounded monged. Got scared and tried tightening more in case it was the air escaping. Then the F*#KING bolt snapped

Had to take the whole pipe off to remove it. But I don't have another bolt. At least I might as well polish the pipe now.

I also lost the bit that goes in between the bov and the pipe the spacer tightening thing. It fell down into the engine, but it was night time and I cbf looking for it. Is this necessary? Does it matter if I need it?

[Brody]

been posted by jay before hand i think.

I did it a while back, seemed to make mine laggy, took it out the next day

[TTT]

LOL @ Gester..

the think plate thing is sort of like a washer for a bolt or a gasket.. how ever you want to look at it..

you should find it and use it..

it's weird that people have had different experiences.

[Gester]

Yeah heh, just went out and bought some gasket paper and cut a new one. Its all good now but what a pain just to get it back to what it was

[NismoR34]

Looks like another little project for me to try!

will let you know how it goes on my 34

cheers

[TurboX]

If you have an AUTO - DON'T screw around with this BPV - BY PASS Valve!

If you have a MANUAL - DON'T screw around with this BOV - Blow Off Valve.

If you dont realise the difference, dont screw around!

But consider instead of letting your boost reference for the wastegate be from the snail of the inducer where it comes from as standard, plumb it in to your intake manifold so your waste gate opens a bit later when the boost is actually at the intake of the engine. Caution, this could over speed your turbo:-)

Obviously you block the orig. hose from the snail to stop airleak.

You could also hook the hose from the BPV/BOV to the Intake manifold direct as well for better response.

[jezzerrr]

That blowing sound through the filter gives me the shiyats... can only just hear the turbo spooling over it! gonna try this mod, hopefully i dont get the problems others have had...

[TTT]

way to bounce an old thread to tell us you are going to try it.

[jezzerrr]

Doh... didn't look at the date...

Your AV comment says it all :crazy:

Made you look

[Chef_32]

i thought that little hole is there to equalise the pressure on both side of the bov piston

[jezzerrr]

sounds like it is, judging from the problems some people have had by doing the mod... I think it's just luck as to whether the spring is up to it or not, depending on the condition of the BOV