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post #1 of 8 Old 11-21-2013, 04:47 AM Thread Starter
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BOV

whats the good/bad of having a blow off valve? where are they normally mounted ?
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post #2 of 8 Old 11-21-2013, 10:55 AM
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I'll do you a favor before you get flammed really really bad google it and just dont put one on. it's that simple, and check out on google what a external wastegate turbo is (on most diesels)

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post #3 of 8 Old 11-21-2013, 11:07 AM
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They exist... they do prevent the bark you get on letting off, especially when shifting if your truck is stick.

The one I can think of costs $700... Yes the turbo bark does put stress on your turbo, but people aren't regularly blowing the 38's to pieces. Besides you probably have a stock turbo, which you can have rebuild for a couple hundred if it does eventually fail.

The reason BOV's are so expensive for diesels is they must be electronic. A regular BOV or Bypass valve on a gas engine works on the pressure wave from closing the throttle plate. Diesel's don't have a throttle plate therefore a regular one does not work, it will do sweet nothing.

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post #4 of 8 Old 11-22-2013, 01:25 PM
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Alot of the higher hp 6.4 guys have them on their twin set-ups. Especially those running with a vgt. it keeps that bad boy safe from overspinning.
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post #5 of 8 Old 11-24-2013, 08:53 AM
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What exactly is stressed when you let off the throttle that would warrant the use of one anyone have one and would like to rationalize why

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post #6 of 8 Old 11-24-2013, 08:49 PM
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That's a turbo bark. (0.55 seconds in)


What's happening is all the boost pressure from the intake, intercooler piping, and intercooler is rapidly exiting through your air filter.... in other words the air is going the wrong way.

This causes your turbo wheel to go from spinning really really fast, to almost stop, back and forth until the pressure dissipates. Causes stress on the turbo.....

Will it make it blow up tomorrow? no

. Will a BOV help? yes

Is a $700 BOV worth protecting a turbo worth less than that? hell no. That's why aside from high boost non wastegated builds you don't see them in much use.

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post #7 of 8 Old 11-25-2013, 06:10 AM
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Quote:
Originally Posted by schlutzer View Post
That's a turbo bark. (0.55 seconds in)

turbo bark explained - YouTube

What's happening is all the boost pressure from the intake, intercooler piping, and intercooler is rapidly exiting through your air filter.... in other words the air is going the wrong way.

This causes your turbo wheel to go from spinning really really fast, to almost stop, back and forth until the pressure dissipates. Causes stress on the turbo.....

Will it make it blow up tomorrow? no

. Will a BOV help? yes

Is a $700 BOV worth protecting a turbo worth less than that? hell no. That's why aside from high boost non wastegated builds you don't see them in much use.
great explanation. made me giggle a little but you are right, sure as hell not worth the buy. I get mean turbo bark. its crazy. my girl will be in the truck and she goes, "what the hell was that?!" haha

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post #8 of 8 Old 11-25-2013, 12:53 PM
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That's not my video lol that's just a random one I found.

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