Forge Motorsport Valve Tuning Kit - 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 10-10-2009, 09:30 PM   #1
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Forge Motorsport Valve Tuning Kit

Seems I can fine tune myBlow Off/Diverter Valve to the exact needs of my engine with this complete tuning kit (contains four springs and three spacers).
The strongest spring is the red, followed by the blue, yellow and finally the green which is the weakest. The spacers enable to fine tune the settings between two spring tensions if required.
If the valve is dumping more than required or is are loosing boost pressure it is normally an indication that a stronger spring is required. Conversely if the valve is failing to dump it may be necessary to install a weaker spring. If during this tuning of the valve so is faced for example with the red spring being too strong and the blue spring too weak, simply add the spacers to the blue spring to increase the tension by small increments, thus achieving a setting between the red and blue springs.
Valve Spring color coding
Green - 5-15 PSI
Yellow - 15-23 PSI
Blue - 23-30 PSI
Red - 30 + PSI
The above figures are estimates only and should only be considered as a guideline
Please note - fitting a stronger spring into a valve will not increase boost pressure unless existing pressure is being lost. Failure to allow the valve to operate by installing a spring which is to strong may cause damage to the turbocharger.

BUT: be fucked if I know what spring should I use for my current car set-up (some 320 HP).
Maybe you guys chime in and give an ideea.
Thanks
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Old 10-10-2009, 10:11 PM   #2
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On my JZW stage 3ish (TD04 15t) I had the same questions, I used everything from stock, yellow, green, and blue with different combos of spacers, and I found absolutely NO noticeable difference on the boost gauge or sound or anything. None at all. Now I use stock. This doesn't really help you at all but that is my experience with it.

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Old 10-11-2009, 12:24 AM   #3
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Yup had a forge. had the yellow in it, then knocked it down to the green, and I didnt notice a thing. I too am running stock (although atmos.) because I need to cover my ass if i get pulled over and look unmodified.
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Old 10-11-2009, 11:48 AM   #4
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It's even been suggested by Nick at genuine to just run the yellow. I had the kit and also changed springs with no noticeable difference.
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Old 10-12-2009, 07:36 AM   #5
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I run the softest Green springs in the t7 cars with recirculating valves. On the Open airs we spec them with yellow so they stay more closed at idle. Anything more and you just hit the turbo with a big pressure spike.

PS there is no way 320hp on stock turbo
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
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Old 10-12-2009, 12:38 PM   #6
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turbo uppgradering

Quote:
Originally Posted by GenuineSaab View Post
PS there is no way 320hp on stock turbo
Who said something about stock turbo? TD04HL19 #6 now.
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Old 10-13-2009, 04:46 PM   #7
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Quote:
Originally Posted by Adrenaline406 View Post
Yup had a forge. had the yellow in it, then knocked it down to the green, and I didnt notice a thing. I too am running stock (although atmos.) because I need to cover my ass if i get pulled over and look unmodified.
Any idea what spring it has now? Ie the one I bought from you... Cas there wasnt any color on the spring when I re-greased it.
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Old 10-13-2009, 05:09 PM   #8
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I never have a problem running the lightest spring, even at 26+ psi. Equal pressures on both sides means the piston should not move under full boost.
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Old 10-13-2009, 06:38 PM   #9
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Quote:
Originally Posted by Saabeh View Post
I never have a problem running the lightest spring, even at 26+ psi. Equal pressures on both sides means the piston should not move under full boost.
What nick was saying about the yellow in the BOV is just to keep it closed at idle, so nothing gets sucked into the engine while its in vacuum. On the BPV, that obviously wouldn't matter as it's pulling air from the intake post filter.
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Old 10-13-2009, 08:32 PM   #10
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Yeah I know.

In my experience, having any heavier of a spring just leads to partial throttle fluttering. Like, you have to get in boost and completely off in order for it to not flutter.
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Old 10-14-2009, 12:11 PM   #11
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Quote:
Originally Posted by sleepy7666 View Post
Any idea what spring it has now? Ie the one I bought from you... Cas there wasnt any color on the spring when I re-greased it.
Green. Im sure of it. And there should have been a good amount of grease in it when I shipped because I remember checking that, but good to hear that you're C.Y.A.

EDIT: mine never leaked at idle with the green.
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Old 10-15-2009, 10:48 AM   #12
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Quote:
Originally Posted by Adrenaline406 View Post
Green. Im sure of it. And there should have been a good amount of grease in it when I shipped because I remember checking that, but good to hear that you're C.Y.A.

EDIT: mine never leaked at idle with the green.
I wanted to tear it down and see how it worked... Always curious here.

Mine doesn't leak at idle either it has the green spring on my 99 9-3SE (T5 Suite Stg 1). (Adrenaline406's former Forge BOV)
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Old 10-31-2009, 04:39 AM   #13
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newsflash!

NEWSFLASH!
After some trial & errorr with the different kinds of springs for the Forge BOV, I got to the following conclusion:
- originally went with green spring... a lot of vibrations and some 16 liters/100 km. Turbo power delivered as from the a dump (i.e. at once). Used the green one more from inertia. Then I re-read carefully Nick`s above post: on the Open Air we spec the yellow (so down under);
- tried the blue one...more vibrations, changed it fast to
- yellow one. Best option for my set-up. Wayy less vibrations, a nicer power delivery and some 12,6 liters/100 km fuel usage.

Once again, Nick T is right in what he says! Yellow spring in Forge BOV with Open Air kit will remain.

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Last edited by av_dumitrascu; 10-31-2009 at 07:41 AM.
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Old 10-31-2009, 05:50 AM   #14
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I love the hyperboost valve as there isn't any nonsense with changing springs.
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Old 10-31-2009, 07:33 AM   #15
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Yeah I know.

In my experience, having any heavier of a spring just leads to partial throttle fluttering. Like, you have to get in boost and completely off in order for it to not flutter.
Yup, hence why I am still using a green spring even at 360chp. I too experimented with springs and spacers with that kit and found that I held the same amount of boost with the green spring. I thought the secondary spring for the twin piston BOVs was responsible for holding the valve closed at idle and to increase the responsiveness?
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Old 11-02-2009, 07:45 AM   #16
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Quote:
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I love the hyperboost valve as there isn't any nonsense with changing springs.

Agreed! There shouldn't be any with the forge.. Leave the green in it as supplied and run it.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 11-02-2009, 11:20 AM   #17
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yellow

on mine, yellow.
Don`t know, but engine runs smoother, better fuel usage, so dropped the green ones.
Anyway, I will keep you posted.

P.S. Nick, any word on my email? 10x
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