Power FC Pressure Gauge Testing - PFC vs. GReddy
06-18-02, 08:23 PM
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Pressure Gauge Testing - PFC vs. GReddy
OK. I took an air pressure source and an accurate digital manometer, and plumbed them into a loop with the PFC (through the stock MAP sensor) and a GReddy boost gauge (electronic – plumbed to its transducer).
I have tabulated the results and attached an XLS spreadsheet.
Obviously there is some error in reading the GReddy gauge (analog), but it is surprisingly accurate. For all intents and purposes, I would call it a +/-5% device for a 5:1 turndown (reads 1.5 kg/cm^2 max), and probably a +/-2% (or better) device for 2:1 turndown.
The stock MAP sensor results were quite the opposite. I did test the sensor and its output is within spec (-9.67 PSI = 1.38V, 0 PSI = 2.62V & 14.31 PSI = 4.47V).
The difference between the stock and the GReddy was (from 0.3 to 0.8 kg/cm^2) about 11% throughout this range. The stock being consistently 11% lower.
Not too sure what to think at this point…any comments???
I have tabulated the results and attached an XLS spreadsheet.
Obviously there is some error in reading the GReddy gauge (analog), but it is surprisingly accurate. For all intents and purposes, I would call it a +/-5% device for a 5:1 turndown (reads 1.5 kg/cm^2 max), and probably a +/-2% (or better) device for 2:1 turndown.
The stock MAP sensor results were quite the opposite. I did test the sensor and its output is within spec (-9.67 PSI = 1.38V, 0 PSI = 2.62V & 14.31 PSI = 4.47V).
The difference between the stock and the GReddy was (from 0.3 to 0.8 kg/cm^2) about 11% throughout this range. The stock being consistently 11% lower.
Not too sure what to think at this point…any comments???
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