Re: I gave up.... - Saab Performance Bulletin Board - Saabnet.com
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Re: I gave up....
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Posted by Stratmoen (more from Stratmoen) on Sun, 17 Dec 2000 17:32:57 Share Post by Email
In Reply to: Re: Dump valve questions - Dean / Karl / Mathias???, Dean, Sun, 17 Dec 2000 13:12:22
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With further study it turns out that the T7 cars use a bypass control valve which plays a little trick to get more out of the stock Bosch valve. When the car is on boost the signal port of the bypass valve is connected in front of the throttle plate. This minimizes pressure loss seen by the signal port and in fact given the stock orientation adds to the spring’s force thus ensuring the valve is closed at high boost levels. When the computer closes the throttle plate the bypass valve’s signal line is connected downstream of the throttle plate thus permitting the valve to quickly open.

If we believe that Saab has properly controlled the bypass control valve then on boost leakage should be minimized without resorting to high spring force.

On the Viggen the turbo outlet duct is made out of plastic and incorporates a restriction in its design to limit compressor speed (yup just look at the duct). The bypass valve is fitted to the side of the duct via a more or less bogus plastic fitting, which is really just thin plastic. The stock bypass valve’s port outer diameter is about 0.75”. On the other hand the Forge valve is about 1”. Given the unyielding plastic fitting on the turbo duct I could not find any way to fit the Forge valve without risking splitting the fitting. Alternatively one could fabricate some plumbing or machine the valve to thin down the wall of the port. I decided to just replace the Bosch valve and return the Forge for credit.

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