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Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 11-11-2006, 02:35 PM   #11
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Couldn't get the link to work....But I'll trust whatever you say, seeing you have your own site about it!! I see now how the BCA works and which way the lever moves in boost mode. (Down when I throttle it, up when idling...) So what does the BCS do? Control the BCA? Because the BCA seems to be working correctly.
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Old 11-11-2006, 02:51 PM   #12
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The PCM commands the BCS to control the BCA based on gear selected, engine load, and various other parameters.

Think of the BCS as the go-between for the BCA and the Computer.
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Old 11-11-2006, 04:07 PM   #13
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So doesn't that mean the BCS is working, because the BCA is moving when you throttle it?
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Old 11-11-2006, 04:12 PM   #14
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When you remove that vacuum line from the top of the BCA and it moves FULLY, it means the BCA is CAPABLE of full travel/full boost if it'* commanded to.

So now you move back to WHY it'* not fully travelling when commanded.
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Old 11-11-2006, 04:22 PM   #15
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Man, quick replies!! Sorry to still be confused, but doesn't the BCS TELL the BCA to move when I throttle it? SInce it'* moving, isn't the BCS controlling it correctly? Or is that not how it works? Sorry to ask so many ??? about it.
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Old 11-11-2006, 05:15 PM   #16
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Do you understand duty cycle? The BCS is either OPEN or CLOSED. But it varies this by pulsing a duty cycle. This is how it VARIABLY controls the BCA.
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Old 11-11-2006, 05:19 PM   #17
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Aaahhhh...Variably....I didn't understand that part. Thanks for your help. I'm gonna get a BCS and let you know how I make out. Thanks!
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Old 11-14-2006, 12:24 AM   #18
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Just a shot in the dark here, but have you tested the boost guage itself? Have you put a mechanical guage on the plenum to see what the pressure is when accelerating?
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Old 11-14-2006, 12:33 AM   #19
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Quote:
Originally Posted by motorhead
Just a shot in the dark here, but have you tested the boost guage itself? Have you put a mechanical guage on the plenum to see what the pressure is when accelerating?
Motorhead, that'* a great idea, but in our rather extensive experience on this Forum, we have yet to see a single failure of a boost gauge. To take it even farther, we've yet to see a single failure of a MAP sensor on the Series 1 (which sole purpose is for a boost pressure indication).

Let'* stick to what we know are the most common failure modes.
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Old 11-14-2006, 11:16 PM   #20
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Ordered the BCS today, $28. I'll let you know when it comes in.
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