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Old 02-28-2008, 12:09 AM   #1
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Default Gauge reads very low

my 94 SSEi (stock airbox) reads at the far left side of the boost gauge (the negative side).
It only gets up to the "0" mark or into positive territory if I'm accelerating hard. Has anyone else seen this sort of thing? I apologize that I've not been used to superchargers and how their gauges typically read... I did suppose that the boost should not be in the negative territory when I'm cruising at highway speeds.

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Old 02-28-2008, 12:20 AM   #2
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Think of the boost gauge used with our type of superchargers as a gas pedal position gauge. The harder you push, the higher the needle goes. Does it get up to near the top at full throttle? If so, sounds about right.
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Old 02-28-2008, 10:55 PM   #3
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Thank you, that makes sense... I guess I didn't think that the gauge would read to the far left when at idle [negative boost]. If the numbers on the gauge are to be taken at face value (no pun intended) then:
if the engine'* at idle I have -10 boost.
if I am sustaining 70mph I have 0.
if I am flooring the pedal I have 4 or 5
For reference, I looked at DanThurs' gauges which seems to read differently at idle/ ignition on accessory. www.thurs.net/dan/personal/car/


Does that seem like an appropriate read? If so, I apologize for belaboring this. I'm trying to learn, and I didn't see any other threads with this question.
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Old 02-28-2008, 11:05 PM   #4
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His engine isn't running in that pic, but the key was turned. So the manifold pressure was ambiant (0psi). But floored, you should see around 9 psi.
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Old 02-28-2008, 11:21 PM   #5
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Maybe the gauge is simply miswired since even on accessory, the gauge reads in the negative territory.
Thanks for the help.
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Old 02-28-2008, 11:22 PM   #6
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Where does it read, with the key on and engine off?
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Old 02-28-2008, 11:27 PM   #7
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The needle rests at the extreme left; that is, -10. It is the same reading at idle. I appreciate your patience with this thread, perhaps I'm not explaining it well.
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Old 02-28-2008, 11:41 PM   #8
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When you turn the key forward to "ON", those three gauges (boost, oil pressure, and temp) should sweep to the end and back, and then settle on their readings. If you don't start the engine, the boost should settle on 0. If you turn the key back to ACC, they shouldn't do anything.
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