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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 07-15-2007, 11:35 AM   #1
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Boost gauge trouble

So i installed my boost gauge yesterday and its been acting a little funny. Its an autometer sportcomp 2, and is tapped into the vac hose after the Diverter Valve. When i start the car it reads at 25 vac, then after a couple seconds goes to zero. in nuetral when accelerating slowly it stays on zero, but if you rev it hard it goes to 25. When driving it shows boost fine and holds a good 14 psi, and when I let off it will go back to 25. Also in vac it never shows a gradual decrease it will either read 25, 10 or 0.
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Old 07-15-2007, 11:40 AM   #2
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Is it a mechanical or electric gauge?
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Old 07-15-2007, 12:58 PM   #3
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Mechanical
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Old 07-15-2007, 01:01 PM   #4
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Check the connections, and also make sure you do not have a kinked line somewhere. The line that comes with AM gauges is easy to kink.

Does the gauge itself make any noises?
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Old 07-15-2007, 02:00 PM   #5
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Somebody correct me if I'm wrong but on T7 cars to tap for a boost gauge isn't really picky about where you can tap. Second though checking the line for kinks and a new nylon is cheap at autozone. However I would think that if the line was kinked it wouldn't ever move from zero at start to 25 idle and then back to zero.



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Old 07-15-2007, 02:10 PM   #6
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I have a picture that shows the right place to tap for the gauge.
I'll see if I can find it...


Ok, it's on my computer at home. I'll post it later.

Here is a good thread:
https://www.saablink.net/forum/showth...ht=boost+gauge
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Old 07-15-2007, 02:16 PM   #7
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Quote:
Originally Posted by Palmer View Post
I have a picture that shows the right place to tap for the gauge.
I'll see if I can find it...
I think DIP has it (for the 9-5) if its the same regardless of 9-5 or 9-3.


This is from dips site on the 9-5 and he says that this t-fitting is there already but no explantion as to what it goes to. He says he used it. I'll provide the link to the 9-5 write up which in principle probably holds true for splice posistion on the t7 9-3.

Dip's Site.



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