Forge BOV & GS Intake questions - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 03-11-2008, 06:01 PM   #1
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Forge BOV & GS Intake questions

What up,

I have a 99 9-3 SE HOT and I just installed a forge bov & GS intake and was wondering what experiences others have had with them. The bov has the yellow spring in it, I took it apart and lubed it up with some mobil 1 synthetic grease before I installed it. The install was a peice of cake but it was a bit anti-climactic. When I fired the car up, I was expecting lots of lift throttle “pshhhhh” and “whoosh” noise but I could only hear it when the car was pulling rather hard and it sounded more like a “cough” Is that normal??? The car seemed to boost faster than before and the intake sounds great, no problems there but I want more “pshhhhhh”. Any ideas??? I guess its not that big of a deal. I cant wait to get the GS rack brace, SS lines and bushings in. I see a 3” downpipe in the future as well.

Thanks

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Old 03-11-2008, 06:19 PM   #2
 
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The Forge isn't loud at all.

One of the main reasons is because it allows boost to exit so smoothly, instead of having restrictive holes or horns.
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Old 03-11-2008, 06:23 PM   #3
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mine is freakin loud as hell and it takes very little boost to make it open. Try a different spring? Im not sure which one mine has in it.
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Old 03-11-2008, 06:32 PM   #4
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I have a FMDV001 forge BOV



My is VERY "talkative," very audible (in fact this is exactly why mcrowley sold it ), but other forge valves I have heard are less so. What model to you have Passenger 57?
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Old 03-11-2008, 06:40 PM   #5
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JK's=not quiet at all.

I would maybe call Forge and see what spring they suggest. If you are stock, you will see around 14psi of boost, peak.
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Old 03-11-2008, 06:41 PM   #6
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I have the FMDV004A

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Old 03-11-2008, 06:42 PM   #7
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Quote:
Originally Posted by mike saunders View Post
The Forge isn't loud at all.

One of the main reasons is because it allows boost to exit so smoothly, instead of having restrictive holes or horns.
This is my experience with it on my Viggen, i would say its just right and not annoying.
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Old 03-11-2008, 06:57 PM   #8
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I think the dual piston valves are less vocal than the single piston.

I have to only lightly back off the throttle (not even all the way off) with the 001, and its going to hiss. The dual piston has a second spring that is meant to keep things closed unless it needs to blow off. That's probably much of the reason.

Show up for a get together sometime this summer and I'd let you give the 001 a listen in my car, or if you were really up for it, try it on your car (although its pretty much going to sound the same ).
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Old 03-11-2008, 07:10 PM   #9
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JK is definitely right about the dual piston vs single. I've had both...single was WAY louder....by a mile.

I run single piston recirculating valves (006 and 007P) vented to atmosphere on both of my cars, both with the blue spring & 2 shims. They're both loud enough. Also consider the amount of boost passing through them and the size of the intercooler piping will have an effect on how it'll sound.
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Old 03-12-2008, 10:06 AM   #10
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I talked to Forge and they recommend the yellow spring for stock levels of boost.
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Old 03-12-2008, 12:07 PM   #11
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I have both of those mods and mine is pretty loud its not so much of a woosh noise but more of a chirp or whistle
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Old 03-12-2008, 02:26 PM   #12
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Quote:
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I have both of those mods and mine is pretty loud its not so much of a woosh noise but more of a chirp or whistle
Thats exactly what mine sounds like. I have yet to pop the thing open since i got it though, not sure what spring is in there.
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Old 03-12-2008, 02:50 PM   #13
 
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Try forcing a lot of air through a small opening by pursing your lips tightly. You'll probably hear a whistle as the air encounters resistance

Open your mouth wider to let air out more quickly, and with less resistance, and you'll hear a slight whuush....
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Old 03-12-2008, 04:35 PM   #14
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so Mike, youre saying that i might need to put a lighter spring in? I can tell you that I still get "blow-off" at 1-2lbs. of boost (its a very light whistle, but still obviously there)
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Old 03-12-2008, 04:44 PM   #15
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Thats exactly what mine sounds like. I have yet to pop the thing open since i got it though, not sure what spring is in there.
I opend mine the other day and cleaned up some gunk that had built up in there..i had a yellow spring which i think comes standard when you order it
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Old 03-15-2008, 08:46 AM   #16
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I dont want to beat a dead horse but, I am getting a weird "coughing" sound comming out of the intake when the BOV dumps boost. Does anyone else get this??? Any idaes what this could be??? Also the bov doesnt open when the car isnt under load, ie reving the engine with the clutch engaged. Maybe I am worring to much, but I dont want to do any damage to the turbo.
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Old 03-15-2008, 08:54 AM   #17
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Well, if the car is not under load, the turbo will not be making enough boost to open the BOV.

I can't help you with the other part though.
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Old 03-15-2008, 08:55 AM   #18
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Are you referring to turbo flutter?

From Tubrosmart.com:
Quote:
The "flutter" noise reported by many excited enthusiasts may sound good but is actually very unhealthy for the turbo. The "flutter" occurs when upon shutting the throttle, air caught between the free-spinning turbo and the shut throttle. The consequent back pressure forces the air back through the turbine blades. This process, more commonly called "cavitation" places enormous loads on the turbo and can lead to premature wear of the turbo bearings and other load-bearing components. The cavitation or "flutter" can be fixed by either fitting a blow-off valve onto a system that hasn't got one, or making sure the blow-off valve is matched to the output of the turbo and is not working outside its flow capacity and ensuring the blow-off valve is set up correctly.
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Old 03-15-2008, 09:52 AM   #19
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Uh oh....
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Old 03-15-2008, 11:23 AM   #20
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lol i bought an ebay bov to see if i could make it function... that cavitation flutter was all that i could get. I also didnt realize how bad it was and what exactly it was doing either
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