Diverter Valve For Viggen - 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 11-20-2007, 07:01 AM   #1
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Diverter Valve For Viggen

Has anyone changed the stock diverter valve on a Viggen? Its supposed to increase turbo spool up when changing gear. Is it noticeable?
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Old 11-20-2007, 07:05 AM   #2
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yea i installed a forge dv. it didnt incrase spool up, throttle response just seemed slightly more precise. it didnt make much of a difference to be honest the stock viggen dv is fine.
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Old 11-20-2007, 07:13 AM   #3
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All a diverter valve does is recirculate the air back into the intake using a metal spring that holds the pressure of the turbo. If you are making more than 280hp (Stage 3 or 4) then your stock one will start to wear out and wont hold the boost. Otherwise with an open air intake it just makes a crisper sound, not the sneezing sound.
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Old 11-20-2007, 07:24 AM   #4
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only way you would feel any difference really from a aftermarket valve is if your stock one was failing. so if this is purely a possible purchase in the intentions of getting better performance pass on it unless your running a ecu tune upgrade, or your stock valve is failing.
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Old 11-20-2007, 07:25 AM   #5
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I have a Hyperboost Compact HX and have been happy with it. Its stock in size. I dont know how noticeable the performance aspect is. Its not going to be noticeable. I bought it for the sound and underhood asethetics.
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Old 11-20-2007, 07:27 AM   #6
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I have a Hyperboost Compact HX and have been happy with it. Its stock in size. I dont know how noticeable the performance aspect is. Its not going to be noticeable. I bought it for the sound and underhood asethetics.
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Old 11-20-2007, 07:56 AM   #7
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If you are making more than 280hp (Stage 3 or 4) then your stock one will start to wear out and wont hold the boost.
Not necessarily true... Both the Automotion 2.3L GT30 ng and 9000 w/essentially the same motor both use the plastic bosch bpv.
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Old 11-20-2007, 08:11 AM   #8
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Quote:
Originally Posted by LeGiT SaaB View Post
If you are making more than 280hp (Stage 3 or 4)
It really has nothing to do with the power levels so much as the boost levels.

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Not necessarily true... Both the Automotion 2.3L GT30 ng and 9000 w/essentially the same motor both use the plastic bosch bpv.
QTF - both of which are 350+ whp cars.
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Old 11-20-2007, 08:29 AM   #9
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Thanks alot. Think i will just stay stock until it gives a problem then.
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Old 11-21-2007, 04:13 AM   #10
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Originally Posted by LeGiT SaaB View Post
If you are making more than 280hp (Stage 3 or 4) then your stock one will start to wear out and wont hold the boost. Otherwise with an open air intake it just makes a crisper sound, not the sneezing sound.
Seems to work fine on +450hp Viggens
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Old 11-22-2007, 07:31 AM   #11
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Seems to work fine on +450hp Viggens
Had a look at your pics. It looks awsum. I was thinking of making my bonnet black aswell. Think your pics just convinced me to do it. My friend has a branding company, so he can just put black vinyl on it. Might do the chrome grill cover in black too.
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Old 11-22-2007, 08:19 AM   #12
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Seems to work fine on +450hp Viggens
LOL im not even making 200 at the wheels and its starting to fail. You win.
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Old 11-23-2007, 12:26 AM   #13
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LOL im not even making 200 at the wheels and its starting to fail. You win.
Well if it's broken to start with
A healthy one has no problems.
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Old 11-23-2007, 12:45 AM   #14
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LOL im not even making 200 at the wheels and its starting to fail. You win.
LOL, I have my orig BPV intact from year 2000. Has seen over 100thousand miles out of which 80% bolted to a tuned engine. Now seems to works just fine with current 445whp But honestly its not the WHP that brakes the BPV, more like the boost...
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