Bosch bov issues

Turk · Dec 9, 2010

Troops
anyone having issues with their bosch bov,s? A buddy & I have identical powderlite turbo,s on 04 rx-1,s. we both upgraded to 2560 from 2554(awesome improvement) anyway as soon as we both cranked up the boost to 15 pounds we blew out the diaphrams in both our bov,s. At 10 pounds both bov,s worked great.It is allmost scary how identical it all occured & allmost at the same time.
I had another new bosch given to me by a good friend & will see if this one holds up any better at higher boost levels.

Wheel House Motorsports · Dec 9, 2010

did lots of reading on the net and sounds like at around 14/15# the diaphragms just blow out.. under that they last forever.. just get a metal housing ebay one with a 1" inlet tube and slap it in there.. no worrying then.

TTE · Dec 9, 2010

There are different bosch bovs on the marked. Read this link - some info on different product # on the bosch bovs. Hope it helps:face-icon-small-win

http://people.physics.anu.edu.au/~amh110/blow_off_valve.htm

powderlites · Dec 10, 2010

Bosch Blow off valves

make sure they are installed properly.
Once you crank up the boost and they are installed wrong it with try to push the diaphram out because backwards install.
Boost should exit out the opposite the vaccum fitting not the side where diaphram will be trying to blow out.
So many guys blame the blowoff valve when it is install!!

Turbo11T · Dec 10, 2010

powderlites

Can you post a pic of the proper installation. Your description is fuzzy to me.

Thanks

Turk · Dec 10, 2010

All the bov,s were all installed correctly. The intake off the charge tube hit the bottom of the diapghram; not comming in from the side.

powderlites · Dec 10, 2010

Blowoff Valve

should have the boost so equal pressure on diaphram so boost into side so blows out opposite the vaccum nipple!!!
Boost higher then diaphram can take it will be trying to rupture out he side.
Turk these blowoff valves never fail if installed properly

Turk · Dec 11, 2010

Ding ding ding.....we have a winner. Thanx dave. Been running our BOV,s bass ackwards for 3 years!!!!!!

Turbo11T · Dec 11, 2010

BOV

Is this pic right? Or is it backwards? I found it online, It is backwards from what I would think it should be?

Linc · Dec 11, 2010

The set up is as you have it pictured!

Linc · Dec 11, 2010

That BOV you have there is more of a recirculating valve than a BOV, it's found on turbo charged Audi's mostly, they work ok, but the real real performance of a BOV is found in the bigger units, the quicker the back pressure is relieved, the less the turbo stacks and and slows down, resulting in less turbo lag. On the Audi's it is dumped back into the intake before the turbo (recirculated ) and is a big part of the tuning on the car.

Turbo11T · Dec 11, 2010

Linc said:
The boost goes in the from the bottom ( you have the arrow going out, it should go IN that way) and out off the side.

I think the way powderlites is describing it is how I have it pictured. Hopefully they will be back on here to give a final answer. I am going to dump back into the intake side on my setup. I think it will blow, shake, vibrate, you name it the snow and ice off the prefilter.

Linc · Dec 12, 2010

Yup that's right, I had to go look at my car and see though, ****, I forgot how it went on! Ha Ha ha

powderlites · Dec 12, 2010

Blowoff Valve

Yup Good picture and hope you guys understand why the high pressure would cause them to fail when installed wrong!!
Diaphram would be poking out or rip right away.

Wheel House Motorsports · Dec 29, 2010

even thought this thread is a hair old.. i was digging around under the hood of my moms 1.8t VW which is one of the applications they run these in from the factory, and its setup identical to the way powderlites shows them.

this is how I will be setting mine up.. and pushing 15+ psi plenty if all goes as planned.

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Bosch bov issues

Turk

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Wheel House Motorsports

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TTE

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powderlites

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Turbo11T

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Turk

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powderlites

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Turk

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Linc

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