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So, how many of you guys remember the Laing D4/MCP650? ...anybody?
Okay, well, anyway, I was curious as to how the 'ole D4 would stack up against the D5 Basic... so, onetwothreego!
Equipment and Methodology:
This time around, I'm using an Omega FL-1504A-B flow meter, borrowed from the waterblock test system, to monitor flow (0.628-6.28GPM, +/- 2% full scale accuracy, +/- 0.5% repeatability, graduated every 2% of scale) and a Sper Scientific 840081 manometer, also borrowed from the waterblock test system, hooked up to a computer for dynamic head pressure data logging (-15 to 15PSI, 0.01PSI resolution, +/- 0.3% full scale accuracy, +/- 0.2% repeatability, and combined linearity & hysteresis of +/- 0.2%). The pumps being tested were kept at 12.00V (measured at the pump's power connector) throughout testing with my trusty HP 6264B variable DC PSU.
A quick photo of the test setup:
Each data point collected represents the mean of three trials, with 30 seconds of pressure data logged and averaged per trial (for a total of 90 samples per final data point). The reason for multiple trials and somewhat excessive data logging was to help mitigate any fluctuations in pump output and issues with the nut on the handlebars (e.g. anthropogenic flowmeter read error).
...and here's the resulting performance curve with power consumption:
...the chart that the data for the graph was pulled from:
With Laing's & Swiftech's specs for the D4 putting it so close to the current D5 Vario, I can't say that I'm terribly surprised the D5 Basic got walked over. I did, however, note a noticeable difference in the acoustic quality of the two pumps--the D4 has a much more pronounced electronic 'buzz' and is a bit louder than the D5.
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