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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 04-07-2005, 03:48 AM   #1
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viggen boost not impressed?

I am thinking I have a minor vaccum leak in the viggen. I got the stage 3 ecu for SQR, and was pretty impressed with the performance at first, but now about a month later, I am noticing that the spool up isn't as fast as it was when I first got the stage 3 ecu. I went through all of the things that I thought might cause this, but i'm at a loss unless there is a small vaccum leak. The car is still ver fast, but it feels more like it did before the ECU upgrade.
Anybody know of good tricks to determine vaccum leaks?
Any other thoughts as to what it could be.
I have a BPV which is a few months old and seems to be working well, I don't think its related to that.
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Old 04-07-2005, 06:07 AM   #2
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could be the BPV. That stock Bosch unit isn't that great, and will not consistently hold high boost.

I would go thru and replace all vacuum lines with new silicone vac lines.
(cheap & easy)

Best thing to do is get a boost gauge. You'll be able to monitor what's happening and see if there is a leak right away.
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Old 04-07-2005, 02:44 PM   #3
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its not a stock BPV, its a forge so I don't think its that..
I will replace the vacuum lines, but they look brand new
I definately need to get a boost gauge, but I am working on a custom setup for a guage cluster, but I don't want to give away too much about that cuase its freakkin rad

anything else it might be that I could check out?
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Old 04-07-2005, 03:38 PM   #4
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Try putting in some fresh new spark plugs. BCPR7ES-11 ...

This is the reason I got a datalogger. Keeps you from guessing. With T7, the boost won't be exactly the same every time anyway. With a logger you can log air-mass/second ... which will let you know for sure if you're losing power.

Adrian~
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Old 04-07-2005, 08:19 PM   #5
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I recall that they were having trouble with your car at SQR day trying to locate a vacuum leak. there are several methods of how to locate vacuum leaks, the one I prefer is to use propane around the suspected leak spots and monitor idle speed while you are checking around. a change in idle speed means there is a leak...
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Old 04-08-2005, 03:37 AM   #6
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I had a similar problem when I first dyno'd my stage 3 Maptun a couple years ago....

found my leak on the stock lines at the base of the throttle body. Take a look at the bottom of your turbo from the boost controller, mine actually slipped off but most likely pulled off after some other installs...so I used the plastic pull-ties that seem to help quite a bit.

I replaced all of my vacuum lines with some red silicon ones from SAAB Savior, then secured each end of the new vacuum lines with pull-ties, and trimmed it down to the tab so it's hardly noticeable.

Like mentioned before a boost guage will help you find it on a typical NG...but from what I understand about a T7, as it responds to temp changes to maintain relative power levels. You would probably see inconsistent boost levels all the time. That's why I'm more inclined to like Adrian's idea also.....
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