I just finished the install ot the Detroit Tuned BPV

EDIT >>> I know I said TB ... SORRY !!!

WOW !!!

Now some back ground:
I Did VGS some time ago and was quite happy.
Over the last couple of months I had much lower vacuum than before. Thought that might be a hose issue.
I took the IC off and checked all hoses... seemed OK
Decided to do the DT BPV
look at my BPV as removed


The DT BPV had a butterfly that shut tight ... NO light gap
I did a ECU reset

Now I am back to 10 lbs + of vacuum
and the the car feels GREAT now
As you can FEEL the BOOST

Gets my

 

...

 

Thats how excited I was ... YES ... By Pass Valve !

OK so now my question is can I change a thread name ?

 

LOL! , sorry, I don't know how you change a thread name...

Congrats on your renewed boost!

 

Thanks "Mr. NAM" for correcting my thread name

 

Were you getting a CEL?

 

No CEL ...

 

wow; that's way worse than mine was.

 

Is there a possibility that the VGS could have caused your OEM valve to get like that?

 

Were you thinking that it caused the butterfly to shrink?

No, this is just sloppy parts and workmanship from the factory, that all fell within the tolerances they had allowed.

The Detroit BPV is the only way to go.

 

The BPVs are known to be bad.... crappy part with crappy quality. And if you want to know what these two items do (Modded BPV and VGS), and how they effect the car, read this post. It's too long to retype.

But FWIW, you can just reset the stop-screw and get your valve back to normal. Use some thread lock, and it's good to go!

Matt

 

This wasn't invented by Chad at DT. It was first done by Ryan (RyePhile here) and went by the name of RyeFix II. I guess I've just been around long enough to have seen the history, and how history forgets.....

Matt

 

You folks do know you can adjust this yourself, in about 5 minutes......for free??

Edit: What Matt said

 

But what they heay, if you buy the valve from Chad, you don't have to worry about breaking the tabs when you change the spring....

Matt

 

Forgot about the springs. Never found that bit useful.

 

What I said earlier without the drama.

Paul

 

My thought process was that since he had experienced a loss of vaccum/boost at some specific point in time after the VGS was done, the added air pressure dump from post S/C could have damaged the weak/cr$ppy OEM spring from the added velocity of the valve opening/closing, therefore causing the valve to not close properly/completely, as per the posted picture. Then again, who knows what it was like before the VGS.

Thanks Dr.O , I've previously read over the referenced post and other related threads and I (think) I understand what the mod is for and how it works.

And I also get the general consensus that the OEM BPV's are cr$ppy at best.

BTW, the butterfly didn't shrink , it's just not fully closed.

 

This was not against the stop when removed
The butterfly cioud be pushed closed but this is the position that it would return to.
Could VGS have weekened the spring .... maybe
but the valve that is actuated by vacuum shoud be able to handle vacuum

anyway I am now way better

 

What was your vacuum and boost numbers before and after the BPV change?

If the BVP is bad, would the idle vacuum be low? Like 4 to 6 in Hg?

 

No, shrink would be my pants since quitting the gym.

 

How? Any links other than Matt's above? His explains how it works but no info on an adjustment.

 

just remove the valve, and turn the set screw. In later valves, they use some good thread lock, so you have to apply a little heat to get it to give.

To modify the spring, I took the diaphram apart, and then stretched the stocker. IT's not the same as the spring in the DT valve, but it gives you some of the effects (earlier closing, but it will open all the way, and doesn't slam closed as much under light throttle driving). Taking the diaphram apart is a bit of a pain, and having 3-4 small jewelers screwdrivers helps (flat blade, not Phillips!). I think the Yo-Yo Chronicals has info on this as well. But that is a novel of a thread!

The VGS won't trash the spring.... Vacuum is what fights to open the spring, and boost forces it more closed. Higher boost doesn't really move too much in the diaphram... Sound like his just gave it up, like many have before!

Matt

 

Yep, right as always Doc (or almost always, just ask Chow ). Thanks for clearing up my erroneous theory. Somehow it made sense in my head.

 

whatever vendor is standing next to whatever broke is blamed! The two are connected, so it was a good guess. And who knows, maybe I'm wrong again!

Matt

 

i did the same thing to my bypass valve.... it didnt take long and i felt like i had accomplished something... as well as learning more about the car


i 'felt' a difference afterwards, but could have been me wanting to feel something.

Do it! you wont regret it