| Re: [GMCnet] Gauges [message #324472 is a reply to message #324467] |
Sat, 30 September 2017 14:54  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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While I agree with a lot of what has been written here, there is an important feature that has not been included. While bleeding the line to the instrument is important, the first fitting of the liquid line should also have a orifice installed. This orifice should be as small as can be tolerated and still allow the instrument to respond. In my labs, we regularly used a two sizes. The fuel pressure taps were typically #60 (0.040) and lube oil was typically #53 (0.0595). These gave effective response for the data acquisition system to secure the test.
Maybe I should also add that the pressure sensors we used were not like anything you ever saw in a vehicle. They were not a resistive sensor at all, but a diaphragm and strain gage set. In the more recent versions that strain bridge is coupled to an onboard op-amp that delivers a 0-5V output for the calibrated range. Shielding the 0-5 signal was never a problem. We tried the RS-232 version, but they were too slow.
The data-ack/cell control system we build used and sold to others did an entire data scan of temperatures, pressures and anything else at least once per second some inputs more often. Instruments or not, we could not count on the reaction time of a "dyno-jock" to recognize and deal with a situation.
I have a Digi-panel and I like it a lot because Mary likes to drive and I know that she does not run an instrument sweep. With a Digi-Panel, she does not have to do one.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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