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Old 03-03-2013, 07:04 AM   #1
Ciedric
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Default Adjust pre-load GFB bov or not?

I've got the TMS 9001 BOV on my Forester '05 but sometimes at iddle the engine doesn't run smoothly, it's going from 1200 rpm to 500 and so on, not stable and mostly when the engine is warm. I think the MAF is not happy with me putting on the bov :P

Now I can turn it more to ventilate but it will reduce the blow off sound and the great backfire pops. Can I adjust the pre-load allen key to solve the problem? Btw there are no caution lights flashing so all is well I guess.
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Old 03-03-2013, 08:20 AM   #2
crabsandwich
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Get ready for the 100,000+ to tell you take the BOV off and throw it in the trash....

Is it ventilating during idle? Did you change the gasket?

But my ultimate suggestion- take it off!
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Old 03-03-2013, 08:43 AM   #3
Ciedric
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Don't know if it's venting at idle. Sometimes the rev is getting up and down when the engine is warm.

For example, you drove a while got to the gas station. Fill it up and then start it again. The engine is reving from 1000 rmp to 1500 and then back to 500 or lower, back at 1500. During driving you don't notice any wrong things. Also waiting for a traffic light don't give issues.
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Old 03-03-2013, 08:50 AM   #4
Cathexis
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Logging, if you have the ability, will give you the answers you seek. If you are popping, you are running super rich, which would make sense since you are venting air instead of recirculating it. Tune for it, or, if possible recirculate it, otherwise take it off.
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Old 03-03-2013, 08:58 AM   #5
Ciedric
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Yes I think it's the MAF being fooled with the BOV. The BOV from GFB can be set on recirculate anyway.

The one problem is that it occurs once in a while.

Pops


Last edited by Ciedric; 03-03-2013 at 09:31 AM.
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Old 03-03-2013, 09:45 AM   #6
Cathexis
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Quote:
Originally Posted by Ciedric View Post
Yes I think it's the MAF being fooled with the BOV. The BOV from GFB can be set on recirculate anyway.

The one problem is that it occurs once in a while.

Pops

Video Link: http://www.youtube.com/watch?v=0ZQfJ46VyDs
If you still want the noise, get an intake, it wont be as loud but you will still hear it.
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Old 03-03-2013, 10:58 AM   #7
Ciedric
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Hmmm I think pod filters are overrated, using hot air filter less.
I got a Cosworth panel filter to fit the orignal airbox.

Maybe I should save money for a ECUtek ecu flash.
Map it less rich 'cause stock Subaru's runs to rich.
The thing is, it is expensive to do it. Overhere they don't uses a Dyno but will sit next to you and log your car in realtime. It also give my car a power gain will run less richer so it will save me petrol money.

Last edited by Ciedric; 03-03-2013 at 11:07 AM.
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Old 03-03-2013, 11:47 AM   #8
Cathexis
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Default

Quote:
Originally Posted by Ciedric View Post
Hmmm I think pod filters are overrated, using hot air filter less.
I got a Cosworth panel filter to fit the orignal airbox.

Maybe I should save money for a ECUtek ecu flash.
Map it less rich 'cause stock Subaru's runs to rich.
The thing is, it is expensive to do it. Overhere they don't uses a Dyno but will sit next to you and log your car in realtime. It also give my car a power gain will run less richer so it will save me petrol money.
Not sure about 06, but i know 08+ need a tune even for some aftermarket panel filters, but that would cause a lean situation.

My '12 ran lean up to 5000 RPM on stock tune to comply with US emissions regs. Stage 1 tune I lost 2 MPG since it richened the mixture starting around 2200 RPM.
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Old 03-04-2013, 12:54 AM   #9
Badmunky
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R.I.P Colin! :(

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Sounds to me like you BOV is leaking metered and the ECU is trying to compensate for it.
Put the stock BPV back on see if the problem gos away.

If it dose get rid of the BOV or set it to 100% recirculation like the stock one.

99.9% its the BOV. MAF cars hate BOVs!!!!!!!!!!!

Oh and the "pop" from your exhaust is NOT cool. It makes the sound like is messed up/ broken and your to cheap to fix it.
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Old 03-04-2013, 12:54 PM   #10
Ciedric
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Overhere petrolheads like backfire sounds. And yes it's the BOV for sure, I should try it when it's on fully recirculate.
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Old 03-04-2013, 03:55 PM   #11
Cathexis
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Quote:
Originally Posted by Ciedric View Post
Overhere petrolheads like backfire sounds. And yes it's the BOV for sure, I should try it when it's on fully recirculate.
I like backfire too.....as long as it accompanies flames!
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Old 03-04-2013, 06:17 PM   #12
Ciedric
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Yeah but a open exhaust system will cause me trouble during the yearly check up which is mandatory/required by the gouverment.
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