Investing in an A/F ratio gauge, 20psi. - SaabCentral Forums
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9-3 Sedan, Cabrio ('04+)/Combi & 9-3X Performance Mods & Tuning - ALL ENGINES Covers GENERAL Tuning & Performance modifications that are *non-engine specific* in nature

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  #1  
Old 19th July 2007
Frosty288's Avatar
Frosty288 Frosty288 is offline
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Default Investing in an A/F ratio gauge, 20psi.

I tried the old leak vacuum pressure trick and it amazingly worked. My boost gauge read a max of 20PSI and the car was crazy, but too crazy for me to keep it like that. I'm going to size down the leak and control it to maybe 16-17psi and invest my money in an A/F ratio gauge to compliment my boost gauge so I know what's going on in there. Luckily they make caps to fit on the end of T fittings so I can run normal boost as long as I keep that cap on. If this, for some stupid reason, works, then i'm only going to run it in ~15 second intervals to see how much of a difference it makes on the drag track. I'm definitely interested.
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Old 22nd July 2007
sleeper900 sleeper900 is online now
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I'm a little confused here...what is this 'old vacuum leak test' mod you speak of? I've never heard of it. It sounds like your gauge is wrong my friend, t8 doesn't like to operate outside of a certain range, a margin of error if you will, and 20psi is certainly outside that range. Can you tell us what you did? If this actually works, share the wealth!
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Old 22nd July 2007
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Leak the pressure from the wastegate by using either an MBC or T line. It will take T8 more pressure to open the valve then normal thus needing to build more boost. Unfortunately, as far as i've tested, it yields no performance increase. My time didn't budge on the track, regardless of being steady at about 15 psi. I'm guessing for the reason that the timing and fuel maps were not adjusted.
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