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Secondary Boost troubles solved? Testing pressure/vacuum chambers

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Secondary Boost troubles solved? Testing pressure/vacuum chambers

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Old 04-25-10, 08:50 PM
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Thumbs up Secondary Boost troubles solved? Testing pressure/vacuum chambers

You got to check this video out of a test I performed. In the video I called the pressure tank the wrong name. I called it the vacuum tank. I meant pressure tank.


http://www.youtube.com/watch?v=OfAlNNPGtXo

Last edited by gracer7-rx7; 04-26-10 at 10:49 AM. Reason: better title
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Old 04-25-10, 09:02 PM
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Nice Find!

Congrats on finding the problem!
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Old 04-25-10, 09:03 PM
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That's pretty rare but glad you found the problem.

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Old 04-25-10, 10:38 PM
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thats pretty cool, good work finding that leak.
hell i'm goona test mine just cause you never know...
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Old 04-26-10, 08:41 AM
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what were your symptoms?
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Old 04-26-10, 10:44 AM
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Brilliant testing procedure.

FAQ has been updated with a link to this thread.

Last edited by gracer7-rx7; 04-26-10 at 10:48 AM.
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Old 04-26-10, 01:42 PM
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Originally Posted by surfmon View Post
what were your symptoms?

symptoms were secondary boost drop off through the gears. At 4500 RPM My boost whent to 5,6,7 if lucky. The only way I could get the secondary up to full boost was to drop a gear and floor it. Bottom line it had a pretty substantial leek. I have'nt put a new one on yet but i will in a couple days. I'll post a reply regarding if it helped or solved the secondary boost issues
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Old 04-27-10, 08:19 PM
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Just out of curiousity, why aren't you checking these lines/tanks with pressure and boost gauges instead of in the bathtub?
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Old 04-27-10, 08:28 PM
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Originally Posted by jmadams74 View Post
Just out of curiousity, why aren't you checking these lines/tanks with pressure and boost gauges instead of in the bathtub?
i dont own any gauges yet. and even still I would do it this way because it is very easy to spot even a slow leak
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Old 04-27-10, 09:27 PM
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Good find. The test of disconnecting the vacuum line to the pressure chamber and hearing the "woosh" is the first thing to look at. If that holds true, you've got a good tank, check valve, and solenoid in the circuit.

You could also cap one nipple and hook a MityVac to the other one - apply vacuum, if it leaks down, there ya go. But, it doesn't make a good Youtube video.

I hope you have my Viton check valves as well .

Good stuff!

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