CM30 VS OEM BOSCH, Interesting RESULTS...
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Joined: Jun 2008
Posts: 3,834
Likes: 65
From: Texas
2003 CL55
What Bosch part number was used in the test? That unit shown does not look like the premium model?
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
Member
Joined: Jan 2008
Posts: 95
Likes: 1
From: The Land of self-moderated Anarchy
Black on Black stock ' 03 C32
Thanks for the test, but it's fundamentally flawed comparison to test a centrifugal pump under a single low load condition. Any two same size and rpm centrifugal pumps will have similar zero head flowrates. (Of course, assuming one of them is a very crappy POS)
To have a real comparison would require testing each pump having the output raised a certain amount, repeat multiple times, and plot the flowrate to graph a pump curve.
For example, at pump output level, then 1 ft elevated, 2 ft elevated, 3 feet elevated, etc, up to the point of no flow (could be about 20 feet for these little hackers) and the point where they have no flow is the output head, appropriately measured in feet.
IF (stress "If"), they have identical zero head flowrates, and one has a final greater head, that's the one you want, bc for any given head (the flowrate resistance when in service in the actual system cooling circuit), the one that has a greater output head will have a greater flow.
For example, if pump "A" has 2GPM @ ZH and a 20ft head rating, and pump "B" has 2GPM @ ZH and 15 ft head rating, and the circuit has 10 ft of head at 2 GPM, then Pump "A" will still be pushing with 10ft of head at the flowrate it gave at 10 ft of head, and Pump "B" will only have 5ft of head at the flowrate. THis is NOT an entirely accurate example, bc as you can see, as the flowrate increases, the system head will increase due to friction and turbulance, so it is not a linear relationship, but you get the idea I suppose.
Nonetheless, thanks for taking the time to do the test you did and posting it.
To have a real comparison would require testing each pump having the output raised a certain amount, repeat multiple times, and plot the flowrate to graph a pump curve.
For example, at pump output level, then 1 ft elevated, 2 ft elevated, 3 feet elevated, etc, up to the point of no flow (could be about 20 feet for these little hackers) and the point where they have no flow is the output head, appropriately measured in feet.
IF (stress "If"), they have identical zero head flowrates, and one has a final greater head, that's the one you want, bc for any given head (the flowrate resistance when in service in the actual system cooling circuit), the one that has a greater output head will have a greater flow.
For example, if pump "A" has 2GPM @ ZH and a 20ft head rating, and pump "B" has 2GPM @ ZH and 15 ft head rating, and the circuit has 10 ft of head at 2 GPM, then Pump "A" will still be pushing with 10ft of head at the flowrate it gave at 10 ft of head, and Pump "B" will only have 5ft of head at the flowrate. THis is NOT an entirely accurate example, bc as you can see, as the flowrate increases, the system head will increase due to friction and turbulance, so it is not a linear relationship, but you get the idea I suppose.
Nonetheless, thanks for taking the time to do the test you did and posting it.
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