where is the BOV on a Turbo 850 wagon

jamie · 2015-10-01T09:41:33+00:00

There is a bov of sorts on the compressor housing of the turbo. You will need to remove it, blank it off and fit one to the intercooler pipework.

Rob

Shiny silver thing in the middle of the pic. :)

jamie

Thanks guys,is it possible to me to fabricate my own blanking plate at all?

Ex850R

jamie;59932 wroteThanks guys,is it possible to me to fabricate my own blanking plate at all?

Sure you can if you are able.

jamie

Thanks for all your help guys,I've watched a few ipd videos online about it and pretty sure I van fabricate one.i was reading a thread about a bloke who was running no cbv,or bov and had blanked off the bypass on the turbo to create the flutter sound.he says it doesn't cause any damage etc but surely all that pressure bouncing off the turbo couldn't be good :/ what are peoples thoughts on this?

Ex850R

Sound like recipe for disaster and less performance to me. They are there for a reason.....

Rob

I agree, if you are going to remove the cbv it should only be in order to upgrade it to something better.

the blanking plate is just a flat plate so is easy to make.

jamie

Ex850R;59950 wroteSound like recipe for disaster and less performance to me. They are there for a reason.....

Yeah,that's what I thought.surely all that pressure wouldn't make your turbo or engine last long

94_850_t5

Easy to make a blanking plate out of thin aluminium .i.e 2mm thick, coat with silicon both sides and then just put the CBV assembly back on top to hold it in place. That's how I did mine, works perfectly well. Sure it still looks like the CBV is there but can assure you that it seals the vent holes perfectly.

jamie

94_850_t5;59983 wroteEasy to make a blanking plate out of thin aluminium .i.e 2mm thick, coat with silicon both sides and then just put the CBV assembly back on top to hold it in place. That's how I did mine, works perfectly well. Sure it still looks like the CBV is there but can assure you that it seals the vent holes perfectly.

I was actually thinking of doing that myself haha

94_850_t5

Just make sure that you use some gasket silicone which can withstand reasonable temperatures. Not that it gets real hot on that side of the turbo. Good Luck!

jamie

Will do mate.probably wouldn't hurt being the engine temperatures around that area also.you guys wouldn't have any pictures of bov setups would you so I've got a bit of an idea where to go with this? There was something said about reticulating the air back into the air intake to avoid misfiring etc

94_850_t5

My 850 has reverse intercooler pipe setup and you can see image of where I fitted in the link I sent previously. There are several options but as mentioned if you whack the thing in and vent to air so that you get the loud wooosh sound you will most likely experience some idling and misfire issues. To overcome this you either recirculate the waste air back into the intake, or have the ECU reprogrammed to suit.

94_850_t5

The existing CBV on the TD04 turbos is effective so long as the rubber diaphragm is not damaged so I guess the question is What are you hoping to achieve? :)

jamie

I guess I was trying to get the infamous bov flutter sound really..

Sorry to change the subject,but while I here o thought id ask as everyone seems quite knowledgeable.i installed a mbc on my car today and bypassed the ecu controlled one.is this fine to do? And what sort of boost pressure can I run safely on a stock setup(besides exhaust and air intake)? I've ran it and driven it etc.i started off purely just off of wastegate pressure and wound it up to 11psi.a friend of mine who does drift racing said he wouldn't wind it up above 14psi on a stock turbo,but he races jap imports,not volvos.

Rob

Mechanically, the engine (including the stock turbo) can handle way more than 14psi. I would not be running high boost on a stock tune though. That could be bad news.

deleted_user_160

That flutter sound your talking about, is NO bov at all. Or running your adjustable bov really tight. (Also known as dosing)

Personally I'm
Running tight'ish and get flutter in the spooling areas around 5vac - +3psi

Dual port bov will give you best of both worlds, your plumbing back to pre turbo (of which you will have to modify the pipe inbetween the AMM and the turbo for the plumb back pipe)
And you will vent to atmosphere also gaining the pttsssshhhhhh sound.

jamie

blondejay;60119 wroteThat flutter sound your talking about, is NO bov at all. Or running your adjustable bov really tight. (Also known as dosing)

Personally I'm
Running tight'ish and get flutter in the spooling areas around 5vac - +3psi

Dual port bov will give you best of both worlds, your plumbing back to pre turbo (of which you will have to modify the pipe inbetween the AMM and the turbo for the plumb back pipe)
And you will vent to atmosphere also gaining the pttsssshhhhhh sound.

Thanks jay,your info is very helpful as I'm still new to these cars let alone the turbo side of things.is there anyway to get my cbv to flutter,or dose so to speak?

jamie

Rob;60110 wroteMechanically, the engine (including the stock turbo) can handle way more than 14psi. I would not be running high boost on a stock tune though. That could be bad news.

What sort of bad news are we talking about?

Ex850R

Running lean at high revs.boost.....
Bang.

jamie

Ex850R;60174 wroteRunning lean at high revs.boost.....
Bang.

Oh sh*t! Ok,what's a good safe everyday boost level to run until I get a bsr ecu remap done? I ran the mbc yesterday for a quick trip arond the block to check my levels and everything was fine.got up today to start my car and its started missing on one cylinder.im yet to take the plugs out and replace them with ngk copper plugs as I think the bit extra boost level couldve cooked one. Does this sound right?