jamie
Can anybody tell me where the stock bov is on the turbo 850 wagon please.i cannot find it anywhere! And also,how do i change it to an aftermarket one?
Rob
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
I will be doing the same task in the next day or 2.
94_850_t5
Don't forget that the ECU via MAF accounts for all of the air in the intake system so removal of OE and fitment of an aftermarket vent to air BOV will cause some unusual operating conditions for the ECU resulting in misfire and some other weird behaviour.
Of course none of that will apply if you vent the air back into the intake.
jamie
Has anybody got a picture of the stock bov on the compressor housing at all by any chance?
94_850_t5
Check the attached link and you'll see pic of a TD04 turbo with Compressor Bypass Valve (CBV) marked by arrow.
http://www.ipdusa.com/products/4898/114437-heavy-duty-compressor-bypass-valve
Officially it's called a CBV as it does not blow off air to atmosphere, it simply recirculates it.
If you want to close it off you purchase a blanking plate, remove the valve assembly and fit the plate.
See following link for a brief writeup of fitment of a BOV. In this instance it also recirculates the air but utilizes a separate BOV unit.
https://ovlov94blog.wordpress.com/2014/10/06/out-withe-cbv-in-with-the-bov/
Hope that helps.
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.
