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The Terminator
Engine/Tuning
03/04 Cobra Vacuum Lines Documented
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<blockquote data-quote="mwolson" data-source="post: 10176898" data-attributes="member: 16006"><p>Nice artwork. I drew mine with MS Visio.</p><p></p><p>I think you are missing the supercharger vacuum reservior and check valve that ensures there is always vacuum so the PCM can actuate the boost bypass valve any time it wants to. The way yours is hooked up, if the PCM tries to dump the boost when there is no vacuum, the boost bypass valve will not work. I suspect this just causes a slight delay when you drop off full throttle for some vacuum to build, so your bypass may open a little slower than stock.</p><p></p><p>I am not sure it is a big issue though. If you read this thread on how to eliminate boost drop-off, <a href="http://www.svtperformance.com/forums/how-230/611497-how-eliminate-boost-drop-off-eliminate-boost-solenoid.html" target="_blank">http://www.svtperformance.com/forums/how-230/611497-how-eliminate-boost-drop-off-eliminate-boost-solenoid.html</a>, you can see that they eliminate the vacuum reserviour and boost dump solenoid entirely.</p><p></p><p>Everything else you did is consistent with my drawing. And you have pictures of the Evap System under the fender. Very helpful. Thanks!</p></blockquote><p></p>
[QUOTE="mwolson, post: 10176898, member: 16006"] Nice artwork. I drew mine with MS Visio. I think you are missing the supercharger vacuum reservior and check valve that ensures there is always vacuum so the PCM can actuate the boost bypass valve any time it wants to. The way yours is hooked up, if the PCM tries to dump the boost when there is no vacuum, the boost bypass valve will not work. I suspect this just causes a slight delay when you drop off full throttle for some vacuum to build, so your bypass may open a little slower than stock. I am not sure it is a big issue though. If you read this thread on how to eliminate boost drop-off, [url]http://www.svtperformance.com/forums/how-230/611497-how-eliminate-boost-drop-off-eliminate-boost-solenoid.html[/url], you can see that they eliminate the vacuum reserviour and boost dump solenoid entirely. Everything else you did is consistent with my drawing. And you have pictures of the Evap System under the fender. Very helpful. Thanks! [/QUOTE]
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03/04 Cobra Vacuum Lines Documented
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