Recommend the best BOV for my boost levels. - Page 5 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-08-2014, 11:40 AM   #81
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Quote:
Originally Posted by 18psi View Post
There's got to be a problem. Either you have a defective valve, or something is up with your vacuum source.

The symptoms you're describing are just...not...normal.

change the vacuum source. it will take 2 seconds to do. run it off the back of the mani. report back.
Pretty much exactly what I was thinking. I don't trust that vacuum source based on what you are experiencing.
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Old 10-08-2014, 12:49 PM   #82
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Something is not right. At idle, my single piston opens with the blue spring, which is actually the one I'm staying with. Closes at part throttle on accel, but opens correctly on throttle lift.
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Old 10-08-2014, 12:51 PM   #83
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Oh, and don't anneal the spring. It will loose its properties and will either not have spring action, will break with use, or both. Cut and re-grind if you must, but better, find the problem.
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Old 10-09-2014, 02:45 PM   #84
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Do you have one of those quarter sized spacers in there or something? Something you can try just for the hell of it is to remove the small plastic piston temporarily and see if you get surges.

It's also possible that your line might be getting pinched or even closed shut from the vacuum.

3/16 line is fine. That's not a problem.
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Old 10-09-2014, 03:15 PM   #85
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I talked to Forge this morning. They said what I'm hearing is not compressor surge but BOV flutter at lower PSI's. I am a bit skeptical because I have been warned many times that lots of people think they have "cool" BOV flutter but its really compressor surge, so I took a quick video (give the link a try, not sure if it will work).

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Old 10-09-2014, 03:55 PM   #86
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Quote:
Originally Posted by Ds1 View Post
I talked to Forge this morning. They said what I'm hearing is not compressor surge but BOV flutter at lower PSI's. I am a bit skeptical because I have been warned many times that lots of people think they have "cool" BOV flutter but its really compressor surge, so I took a quick video (give the link a try, not sure if it will work).

Link works.

Listening to it.. and it does come off as a surge and not bov flutter.

Your vac source may not be strong enough to hold it open. Also if you're shifting with part throttle you could be taking away vac from your source and the bov never fully opens. And this bov is not adjustable is it?

Are you able to snap a pic of the engine bay? I'd like to see your vac source and where the hose is connected.


And per forge's site on this bov...
Quote:
Made from billet aluminium, this atmospheric diverter valve dumps the charge-air to atmosphere creating the "Whoosh" sound when the throttle is lifted.
AT MOST, even my Greddy FV holds enough at 'very' low < 5psi to create compressor surge. But when I'm on the throttle or do partial throttle shifts I still get no more than 2 choos and then release PSSSHH!

Last edited by Girz0r; 10-09-2014 at 04:28 PM.
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Old 10-09-2014, 04:37 PM   #87
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Will do. Nope, not adjustable. If you listen closely in the video, you can hear it open on the second shift for a split second, as I was trying to explain.

One of my friends is coming over later, I'll try revving the car and having him listen closely under the hood.
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Old 10-09-2014, 04:51 PM   #88
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As a test, try disconnecting BOV from vaccuum source and see if it changes the way it works at all. (when your friend comes over)

Btw, you realize you can rev the car from under the hood right? Just twist the throttle at the intake...
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Old 10-09-2014, 04:57 PM   #89
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Quote:
Originally Posted by Chiburbian View Post
As a test, try disconnecting BOV from vaccuum source and see if it changes the way it works at all. (when your friend comes over)

Btw, you realize you can rev the car from under the hood right? Just twist the throttle at the intake...
Ohh thats not a bad idea. I will have to find something to plug the line so I don't have a huge vacuum leak.

Don't worry I'm not THAT noob Its just tough to tell because my BOV is on the turbo side of my system.
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Old 10-09-2014, 05:53 PM   #90
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Quote:
Originally Posted by Ds1 View Post
Ohh thats not a bad idea. I will have to find something to plug the line so I don't have a huge vacuum leak.

Don't worry I'm not THAT noob Its just tough to tell because my BOV is on the turbo side of my system.
Wait, what?

While you CAN place your BOV there, it is by no means a good spot. Move it to about 6-10 inches from your throttle plate if/when you can. The exact distance may be off but you have it on the right side.
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Old 10-09-2014, 06:04 PM   #91
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Quote:
Originally Posted by Chiburbian View Post
Wait, what?

While you CAN place your BOV there, it is by no means a good spot. Move it to about 6-10 inches from your throttle plate if/when you can. The exact distance may be off but you have it on the right side.
^^ This

I want to see what the setup is under the hood
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Old 10-09-2014, 09:25 PM   #92
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I bought the IC and piping used and thats where the PO placed it, but have been having too much fun driving the car to want to move it yet.

Pics tomorrow!
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Old 10-10-2014, 12:47 AM   #93
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there is nothing, at all, wrong with having it on the hotside.

at all.
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Old 10-10-2014, 02:09 AM   #94
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Quote:
Originally Posted by 18psi View Post
there is nothing, at all, wrong with having it on the hotside.

at all.
It appears you are correct... but this is from the Turbosmart installation instructions:
Attached Thumbnails
Recommend the best BOV for my boost levels.-screen-shot-2014-10-10-12.06.02-am.jpg  
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Old 10-11-2014, 08:46 PM   #95
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It sounds like surge is coming from the compressor for sure. Here is something odd. The valve looks to be functioning just fine...

http://s745.photobucket.com/user/Bamfunkified/media/99E31828-8CF2-4120-818F-1C5F589251FE.mp4.html
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Recommend the best BOV for my boost levels.-th_99e31828-8cf2-4120-818f-1c5f589251fe.jpg  
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Old 10-11-2014, 09:24 PM   #96
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Here are under good pics. Notice the T from the boost gauge line.








Attached Thumbnails
Recommend the best BOV for my boost levels.-2ee2b22d-1426-44dd-8250-6318c2c58817.jpg   Recommend the best BOV for my boost levels.-77192933-35f0-43e3-a4c6-0cf89bf1dedf.jpg   Recommend the best BOV for my boost levels.-3df06fbb-8c6e-4cc9-ac17-bd5fc0de81d1.jpg   Recommend the best BOV for my boost levels.-e5be57db-abc2-4d1e-ada3-8cbf25f69f4a.jpg   Recommend the best BOV for my boost levels.-6b3538c0-bd1d-468e-81a3-a3826ac85f6a.jpg  

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Old 10-11-2014, 09:24 PM   #97
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Picture is supposed to show where the Vac/boost line is connected at the manifold, as well as the BOV. Also some reasonable level of photo quality is preferred. People want to help, but you're not cooperating.

*edit* you slipped. Some more pics in. I'm still trying to follow the hoses with some lack of success.
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Old 10-11-2014, 09:44 PM   #98
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either I'm seeing things, or you literally routed the vacuum lines around the whole bay. how long is the line in total from the manifold to the bov? I'm just curious
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Old 10-12-2014, 05:49 AM   #99
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T off this red hose here, cut the extra and report.



Also how stiff is this hose?
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Old 10-12-2014, 07:56 AM   #100
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Good catch. Is the clear hose collapsing?
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