R34 - Block Bov = Low Boost

[illusiVe]

Hey guys/girls (pfft) ...

anyways I have an R34 GTT and when i block my BOV i get a maximum of 5psi, and it takes longer to build unless its a light LIFT-OFF. (which is why i wanted to remove it, better response).

But i want my full 10-12psi (stock turbo).

I've blocked my lines from the bov, and the boost controller im using is a Turbosmart dual-stage (amazing, never had 1 spike issue with it)

anyway, i just want my full boost without my BOV in use.

help

Edited September 18, 2006 by illusiVe

[Cubes]

lol... Your not blocking off the bov.

By blocking off the boost feed you are allowing it to open easily as there is no pressure on the opposite of the diaphragm, Pressure on the opposite side of the diaphragm equalises the pressure and holds the bov shut under boost.

[illusiVe]

my car flutters though.. so i thought it was blocked.. whats the best way to do it then

[mad082]

the best way to block it off is to remove it and put a plate over the top of the hole. then you need to block the return line.

and by blocking it off you won't get better respnse. in fact on gear changes you will have MUCH more lag as the air in the cooler piping hits the closed butterfly, turns around and heads back towards the turbo, and hits the compressor, slowing it down.

the bov lets the air out and keeps the air flowing in the 1 direction.

and at 12psi you wouldn't be losing any boost pressure. if you are want a bit more response you can block up the recirculation hole in the bov. just take the bov off, countersink a hole so that the head of the screw will be flush with the bov. then put a wood screw in.

[illusiVe]

any reason i get MUCH better response during gear changes and QUICK short lift offs with my current setup than stock?

cause it takes time for compressed air to vent..

[mad082]

but you aren't getting the same response. you are only getting 5psi. try the same thing without a boost controller, just off the wastegate (so its 5psi) and see which is better. and you said in your first post that it takes longer to build boost unless it is only light throttle lift off.

yes it takes time to vent, but since your current setup is holding the bov open the air is just flowing straight out. but once you step on the gas again and it buils up enough pressure to open the bov you would lose power, as the turbo keeps working harder and harder, but the boost doesn't rise.

Edited September 18, 2006 by mad082

[Abo Bob]

Faaark.

[illusiVe]

last time i take friends advice for 'removing a bov'

my poor turbo

so if i do something like this (as i understand it from your post)

will remove bov physically and car will run 12 psi with no leakage ?

not shown in the pic, i'd also have to block the original hose from the throttle body/intake area thingie ?

Edited September 18, 2006 by illusiVe

[Cubes]

You only need to throw a plate on the cross over pipe then bolt the bov back over the top of it. Be sure to use gaskets.

But...... Don't fiddle.. Just leave it.

The stock bov is there for a couple of reasons, improve part throttle drivability and to aid turbo life.

[illusiVe]

sooner my turbo dies.. sooner i have reason to upgrade..

[Adriano]

You could just give it to me, save yourself the time and hassle

[illusiVe]

not quite 100% serious on my last comment there...either way ill try it for 3-4 months, then go back.. see which i prefer.

[illusiVe]

so countersinking a screw into the return pipe (which goes back to turbo/intercooler piping i presume should only be blocked off, wont this effectively make it an atmo bov?

i just want flutterz

[Kinks]

in illusive's post, just cut a bit of sheet metal to size and block it where the yellow label is. Don't worry about disconnecting any of the other stuff or plugging anything else.

If you block it at the flange then no air will recirculate, no matter what the diaphragm does. Leave everything else connected so you have no air leaks, and presto.. blocked BOV and it looks stock

[illusiVe]

as done, and works AWESOME.

full boost is now by 2400, even after lift off... before it was 3.5-4k for full boost (stock as a rock btw)

the response and power is jaw droppingly different.

[Cubes]

GoT Da FLuTTeR?

[illusiVe]

thanks for confirmation, yer last thing u want to do is put a piece of metal in your engine by someone just saying 'do this' and being unsure.

when everyone was basically saying the same thing, i gave it a shot and it works awesumz.

my noBov mod is proudly sponsored by 1 wasted can of coke.

[illusiVe]

GoT Da FLuTTeR?

yes, yes i do

[shonen]

can of coke ????

hahahaha oh man I wanna see a pic of that !!

Anyways best way to block off the bov is to take out the black rubber hosing that connects the bov to the return pipe, go to the local hardware and buy 3/4' (from memory) rubber stoppers for chair legs haha and attach to the bov and the return pipe and do up the clamps and your done.....

I only done this to check if the bov was faulty as I seemed to be loosing boost somewhere...and I was right too I was losing boost but it wasnt from the bov....dont recommend leaving it blocked off for extended periods of time though.

[illusiVe]

coke can really worked a treat.

as per my pic,

1) take off bov from 'intercooler piping'

2)trace the gasket onto a can of coke

3)drill holes for bolts

4)match up the holes + gasket

5)bolt up tightly.

done