Thursday, November 29, 2007

SAAB Secret: Retrieve Lost Turbo Pressure for FREE in Less Than a Minute

This trick comes from Chris 9-5, a moderator on the SaabCentral forums. It was in a thread from July of 2007. I found it while searching for Forge diverter valve information. The OP had posted about weak turbo pressure and Chris 9-5 suggested the following modification:

Remove the top vacuum tube from the boost control valve and then plug the loose tube.



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Chris 9-5 explains that it bypasses a one way valve that can become faulty.

It worked wonders for the OP. Chris 9-5 recommended that only people with weak turbo symptoms should make this modification.

As far as I knew I didn't have any problems, the car drove as spirited as the day I purchased it. I had all the power I needed, the car was quick... so I naturally decided it wouldn't hurt anything to try this trick.

The results were dramatic! It is like driving a different car. My whole driving experience is totally enhanced. The most noticeable change is when the transmission kicks down at wide open throttle on the highway. I really feel the torque steer for the first time, just like the OP in the thread described.




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Here is how I plugged the vacuum line; I found a bolt that was the right diameter and cut it down to about an inch long. I then painted the head to make it look nicer. It's that easy.

Some people in the thread didn't see a difference when they removed their line. Other people tried it and found the change remarkable. The people who have made this modification haven't seen any problems and I will make a post if I see any negative results on my 9-5. I'd say people should give this a try and see if they get back some turbo pressure. Just revert it back if there wasn't a positive change in performance.



13 comments:

  1. Whoa! I'm getting anywhere from 2-3 more PSI. I can get it up to 9 PSI in third gear. I haven't had room to give fourth a real workout yet. It definitely pulls harder in every gear though. So where was this boost before and why was I not getting it? Does that mean the BPC valve is bad?

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  2. I've read that it is caused by a failure of a one-way valve on the EVAP system. I tried finding a replacement valve and it seems it can't be purchased separately from the $300 set of EVAP hoses. So if you want a million dollar idea, find a cheap replacement for that one-way valve and 9-5 owners everywhere will beat a path to your door.

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  3. Where is this located on the 3.0t?

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  4. I'm not finding a listing for a Boost Control Valve on the 3.0 in the parts catalogs. That turbo setup on the V6 is unique enough that I don't have a clue how it works, to tell you the truth. I know the turbo and the manifold are basically one piece and the pressure from the turbo is only fed to three of the cylinders. It must have some other method for controlling pressure.

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  5. Did this and the car definetely felt more responsive. Only problem is after 3 days engine management light has come on - is this related??

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  6. I'd say to get the codes read and see what code readers finds. I haven't heard of it causing the CEL to turn on for anyone else and I've been driving with it disconnected since I made this post. If the codes do turn out to be something that this modification could have caused, make sure the hose you disconnected was the right one and that it's sealed completely so there isn't any vacuum leak.

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  7. I am trying this now. Question should I tape over the valve stem on the booster where this hose was attached?

    Thanks

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  8. Nope. Leave it open and the car will be happier than if you seal it up. I tried capping it once and the car didn't like it.

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  9. pressure...

    [...]SAAB Secret: Retrieve Lost Turbo Pressure for FREE in Less Than a Minute | Econmancer[...]...

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  10. Would this work for a 2003 93 Arc?

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  11. Good question. The equivalent 9-3 part I found when I did a search looks different than it is on the 9-5. I couldn't tell you if it would work or not.

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  12. [...] connects to this weekend. I did get the p1110 code to go away. I used the bolt mod as seen here. SAAB Secret: Retrieve Lost Turbo Pressure for FREE in Less Than a Minute | Econmancer Reply With Quote Promote to Article [...]

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  13. I tried the mod today. Before the mod, my 99 9-5 was putting out around 7psi of boost going up this hill in my neighborhood in 2nd gear. After the mod, i tried the same hill and it put out the same. Around 7psi. So I assume there's no problem with my BCV. I just reconnected the hose. Thought I'd post my results. Would LOVE to get closer to 9psi if anyone has any idea of how to get there! Thanks Econmancer! Love all your helpful posts!

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