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Query about Waste gates and BOV's 

 

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 Post subject: Query about Waste gates and BOV's
Posted: Fri Aug 14, 2009 9:36 pm 
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Hello all,

Still a bit new to this turbo thing...

Do you have both a BOV and a waste gate on a turbo install? or you can just have a waste gate?

Also what actually opens the waste gate, is it built into it? (ie when it sees say 9psi it just opens?)

The snort kit ones shown here http://www.snortperformance.com/IMGP0097s.jpg appear to have two hose barbs, are these what trigger them? and then what do these hoses hook too?

Anyone with a mud map of this would be awesome... :S

And a BOV goes after the turbo where the pressure is doesn't it? and does it connect to the waste gate so the gate triggers the BOV?

I have absolutely no idea how this works...

Any help is grgeatly appreciated...

Thanks,
Tim

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Sun Aug 16, 2009 12:22 am 
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Read this ..
http://www.theturboforums.com/turbotech/main.htm
Buy or read this book..
http://www.amazon.com/Maximum-Boost-Tur ... 0837601606

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Sun Aug 16, 2009 12:42 am 
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EBXR8380 wrote:


wow when i have time i will read that..

links ftw

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Sun Aug 16, 2009 8:59 am 
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awwww thanks EB XR8 looks good...

Will read later... I found some stuff about BOV's on google but still couldn't find what I was after for wastegates...

Thanks,
Tim

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Tue Aug 18, 2009 8:41 pm 
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wastegates regulate boost .so say you have a 6psi spring in the wastegate it wont run any lower.
the hose usually goes on the bottom fitting.
top one is usually for a electronic boost controller which will use boh of them .if you connect it to the top one it will just keep boosting.

bov is to release pressure in ya intake pipe to stop the turbo spinning back the other way which can cuase damage . if will usually go off when the t/b is shut closed .

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Tue Aug 18, 2009 8:45 pm 
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Cheers for that...

Continually reading stuff on the net and its slowly making sense...

Set up like this picture I found?
Attachment:
wstgate.gif
wstgate.gif [ 11.49 KiB | Viewed 1645 times ]

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Sat Oct 03, 2009 9:54 pm 
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the bov was created to release pressure and to also keep shaft speed up when changing gears to reduce lag from 2nd to top gear,

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Mon Oct 05, 2009 7:26 pm 
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Tezza393 wrote:
the bov was created to release pressure and to also keep shaft speed up when changing gears to reduce lag from 2nd to top gear,


Agree with the maintenance of shaft speed but not with the VL owner wives tail of the turbo spinning backwards. Still waiting a see a speed log showing the speed fall to zero for that myth to be confirmed/busted.

Also as the throttle shuts you get a massive pressure spike come back through the intake piping which loads up the compressor wheel and forces it to stall. What also happens then is that the torque on the compressor side of the shaft is much greater than, and in the opposite direction to the torque applied to the turbine side of the shaft. Over time, shafts snap when subjected to a lifetime of boost spikes. This is why blow off valves are fitted. To keep the turbo in one piece.

Warranty comes first, reduced lag between gears is just a side effect.
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 Post subject: Re: Query about Waste gates and BOB's
Posted: Tue Oct 06, 2009 12:02 am 
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On a twin turbo set up one turbo can spin backwards..
When coming off high boost on dyno with out BOV..

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Tue Oct 06, 2009 12:20 am 
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I still want to see a turbo speed sensor log because if you measure by eye, there will be certain speeds at which the turbo appears to be spinning backwards but is not. Something to do with the focus rate of the human eye.
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 Post subject: Re: Query about Waste gates and BOV's
Posted: Tue Oct 06, 2009 12:37 am 
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xcabbi wrote:
Tezza393 wrote:
the bov was created to release pressure and to also keep shaft speed up when changing gears to reduce lag from 2nd to top gear,


Agree with the maintenance of shaft speed but not with the VL owner wives tail of the turbo spinning backwards. Still waiting a see a speed log showing the speed fall to zero for that myth to be confirmed/busted.

Also as the throttle shuts you get a massive pressure spike come back through the intake piping which loads up the compressor wheel and forces it to stall. What also happens then is that the torque on the compressor side of the shaft is much greater than, and in the opposite direction to the torque applied to the turbine side of the shaft. Over time, shafts snap when subjected to a lifetime of boost spikes. This is why blow off valves are fitted. To keep the turbo in one piece.

Warranty comes first, reduced lag between gears is just a side effect.



Boost spike??? Its not boost spike. I also have never heard of a compressor wheel stalling. The back pressure or doseing they crap on about (VL guys) is the sound of the pressure wave of air flowing backwards past the tips of the turbine blades. The combined speed of the air flowing back past the tips of the blades reaches the level of the sound barrier. Hence converting pressure to sound energy (like the tips of the rotors do on a huey). The vids you see on you tube make it apear the wheel turns backwards but its like watching the tyres on the car next to you at the lights "turn" backwards while they accelerate.

I mean really, you think 30,000+ rpm can slow, stop and turn backwards in the second it takes to change gear? or just stall?

I am also yet to see proof that doseing has snapped a turbine shaft rather than over speed. Destroy comp wheels maybe, shafts no.

 

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 Post subject: Re: Query about Waste gates and BOV's
Posted: Wed Oct 07, 2009 8:29 pm 
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The correct term is a pressure wave (as you have discribed) but I have improperly called it a boost spike because of the pressure front.

And as for the snapped shaft caused by doesing? I'll post up a few pics of the evidence when I have the time. Mind you thins thing had been dosed for 300,000+kms so I dare say it outlasted the manufacturers expectations.
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 Post subject: Re: Query about Waste gates and BOV's
Posted: Mon Feb 22, 2010 4:42 am 
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Nicko nizpro measured it. The data is somewhere. I can't remember where though (maybe calaisturbo.com ;) ). The outcome was interesting. The wheel doesn't stop ever, it just slows down a few thousand rpm I believe. Marginal really.
The sound and how it is made is described a few posts up.
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