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SVT Shelby GT500
Boost at minimal throttle - normal?
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<blockquote data-quote="fullboogie" data-source="post: 13416850" data-attributes="member: 23633"><p>Everything I've ever read is that boost is solely controlled by the mechanical bypass valve, and nothing else. If you look at the vacuum hose routing to and from the bypass valve, it's pretty simple - one line from the blower, one line from the CAI. There are no electronics or anything else in the circuit.</p><p></p><p>Odd thing is that I took off the CAI/TB/elbow last night and tested the bypass valve - it's functioning perfectly, both holding vacuum and closing all the way. Using a borescope (its' tight in there with everything assembled!) I verified that the bypass valve is pulling the valve completely open when the engine is running. That rules out a mechanical issue. I also don't see any way to "adjust" the valve. </p><p></p><p>I'm going to strap a vacuum/boost gauge to the windshield and see if the mechanical gauge tracks with the dash gauge. If not, I don't know what's wrong with it. If it does, I guess I have super blower or something. I tend to think that it is seeing boost that early, because my WB immediately goes rich when the dash gauge shows boost.</p></blockquote><p></p>
[QUOTE="fullboogie, post: 13416850, member: 23633"] Everything I've ever read is that boost is solely controlled by the mechanical bypass valve, and nothing else. If you look at the vacuum hose routing to and from the bypass valve, it's pretty simple - one line from the blower, one line from the CAI. There are no electronics or anything else in the circuit. Odd thing is that I took off the CAI/TB/elbow last night and tested the bypass valve - it's functioning perfectly, both holding vacuum and closing all the way. Using a borescope (its' tight in there with everything assembled!) I verified that the bypass valve is pulling the valve completely open when the engine is running. That rules out a mechanical issue. I also don't see any way to "adjust" the valve. I'm going to strap a vacuum/boost gauge to the windshield and see if the mechanical gauge tracks with the dash gauge. If not, I don't know what's wrong with it. If it does, I guess I have super blower or something. I tend to think that it is seeing boost that early, because my WB immediately goes rich when the dash gauge shows boost. [/QUOTE]
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Boost at minimal throttle - normal?
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