How does the DG BOV mod work, what are its disadvantages?

[mhuffman]

I read about the dodgemod bov mod for 1g bov's

(http://www.thedodgegarage.com/turbo_bov_mod.html)

and i dont understand why it works. also, does it increase compressor surge or have any negative side-effects? I thought i'd be smart enough to understand the concept but the tutorial only says how to perform it, not how or why it helps.

Thanks.

 

[kidrabbit84]

Check this out:
http://www.dsmtuners.com/forums/showthread.php?t=220909&highlight=1g+bov

To summarize the above link: You are keeping pressure produced by the turbo from overcoming the spring and vacuum side of the diaphragm in the BOV.

You are doing this by plugging the hole which runs from the turbo's charge to the side of the diaphragm, opposite the spring. After plugging the hole you allow the side of the diaphragm, opposite the spring, to vent/breathe to atmosphere through the new tube you install.

Now the turbo's charge is no longer working against the spring in the BOV to open it. In other words the side of the diaphragm, opposite the spring, no longer sees 15 psi, but rather atmospheric (0 gauage psi).

Adam

 

[Cs4g63]

It allows the BOV to hold more pressure than it normally would.

 

[pboglio]

Just buy the Dejon CBV stop leak kit. Same thing as your mod above, although it adds a solenoid which returns the CBV function back to "stock" operation whenever you lift off the throttle. Holds boost to 30 psi and beyond, no downsides that I've seen.

 

[mhuffman]

Check this out:
http://www.dsmtuners.com/forums/showthread.php?t=220909&highlight=1g+bov

To summarize the above link: You are keeping pressure produced by the turbo from overcoming the spring and vacuum side of the diaphragm in the BOV.

You are doing this by plugging the hole which runs from the turbo's charge to the side of the diaphragm, opposite the spring. After plugging the hole you allow the side of the diaphragm, opposite the spring, to vent/breathe to atmosphere through the new tube you install.

Now the turbo's charge is no longer working against the spring in the BOV to open it. In other words the side of the diaphragm, opposite the spring, no longer sees 15 psi, but rather atmospheric (0 gauage psi).

Adam

Ok thanks, now i understand. But, doesnt this mod mean the 'quick release' no longer works and therefore increases the tendency of compressor surge?

Just buy the Dejon CBV stop leak kit. Same thing as your mod above, although it adds a solenoid which returns the CBV function back to "stock" operation whenever you lift off the throttle. Holds boost to 30 psi and beyond, no downsides that I've seen.

I'll look into this.

 

[alex99gst]

EDIT: Just saw this

Ok thanks, now i understand. But, doesnt this mod mean the 'quick release' no longer works and therefore increases the tendency of compressor surge?

Read below.

Go to www.dejonpowerhouse.com and look under the "BOV and Misc tools" section. Scroll down and you will find the leak stop kit. I was worried about installing this at first, but its a breeze to modify your BOV and install the kit. It works because the boost pressure actually holds the valve closed, to further help prevent leaks. The solenoid makes sure that at under 15psi you wont get any compressor surge because it acts like the stock BOV. Past 15psi it switches and helps you hold your boost. $50 vs. a brand new BOV, flange, welding...etc...

 

[mhuffman]

I think ill pressure test my intake system to see when my stock bov leaks and if it leaks before 18psi i'll go ahead with the Dejon mod. very innovative!

Thanks everyone.

 

[alex99gst]

I think ill pressure test my intake system to see when my stock bov leaks and if it leaks before 18psi i'll go ahead with the Dejon mod. very innovative!

Thanks everyone.

I was running 18lbs of boost and eventually bumped it up to 20. I noticed I could hit 20, but it would quickly fall off afterwards and drop to 17-18ish. I went ahead did the mod because now I will never have to upgrade my BOV no matter what boost levels I run. If you have the spare $50 and the time, it is a worth-while mod, no doubt.

 

[kidrabbit84]

I think ill pressure test my intake system to see when my stock bov leaks and if it leaks before 18psi i'll go ahead with the Dejon mod. very innovative!

Thanks everyone.

If your stock BOV doesn’t hold more than what people are quoting a stock BOV to hold, do not modify it. Instead modify one that can hold stock boost values. I modified one that would crack open at 7-8 psi and it did not help the BOV by more than 1-2 psi.

Lesson learned: Start with quality parts first.