Flow comparisons of fuel pumps
#1
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Independent test of several common pumps, interesting read
http://realstreetperformance.com/sto...on-test-5.html
http://realstreetperformance.com/sto...on-test-5.html
#2
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Independent test of several common pumps, interesting read
http://realstreetperformance.com/sto...on-test-5.html
http://realstreetperformance.com/sto...on-test-5.html
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How are the variables constant? They test each pump at a different amperage... Only fair comparison is a constant amperage as a walbro flows quite a bit more at 14 amps than 11. Quite a big jump going up to 17 amp. Maybe I just don't understand the test, can someone fill me in?
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Amperage is a result of the power requirements of the motor, you do not alter this. You can only compare pump flow at a common voltage.
As for the test results, I am not confident with the results posted. Most of the pumps shown have pressure reliefs set for approx 80psi, so I'm unsure of how they got some of these values.
The test voltage was not disclosed for the flow test or the amperage chart.
I have some personal test results here & they look quite different.
As for the test results, I am not confident with the results posted. Most of the pumps shown have pressure reliefs set for approx 80psi, so I'm unsure of how they got some of these values.
The test voltage was not disclosed for the flow test or the amperage chart.
I have some personal test results here & they look quite different.
Last edited by Lonnies Performance; 06-05-2011 at 10:37 AM.
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How are the variables constant? They test each pump at a different amperage... Only fair comparison is a constant amperage as a walbro flows quite a bit more at 14 amps than 11. Quite a big jump going up to 17 amp. Maybe I just don't understand the test, can someone fill me in?
The integrity of the test is sound. The pressure release was at 105psi, the data was truncated to cut off anything after the first pressure relief valve opened to compare only data where the pumps were actively flowing.
This is a very straight forward test with very straight forward results. The point was not to bash the walbro, but to see by how much the pumps differ. The description actually clearly describes how this test proves the walbro worthy for most people.
Lets focus on the results instead of looking for loop holes in the flow readings. I guarantee theres no magic error in there that will shine a holy light on one of the other pumps skewing the ranking of flow.
Last edited by claytonm; 06-13-2011 at 05:46 PM.
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Sorry you are correct and that is why I asked someone to fill me in, like Lonnie did. I did not see the voltage listed or did I have any idea 13.2 volts is industry standard fuel pump voltage. I was not discrediting their work at all, but other test I've seen listed different flow rates at different voltage. Why do you jump to conclusion that I'm looking for "loop holes" or trying to "discredit" anyones work? This benefits me in no way possible as a consumer.
If you beleive public forums are the end all be all for technical information than we have much bigger issues to worry about. I do realize you can alter voltage to the fuel pump and achieve higher flow rates. So what is your agenda here claytonm, as it appears you joined this forum just to comment on this post?
If you beleive public forums are the end all be all for technical information than we have much bigger issues to worry about. I do realize you can alter voltage to the fuel pump and achieve higher flow rates. So what is your agenda here claytonm, as it appears you joined this forum just to comment on this post?
#9
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Sorry you are correct and that is why I asked someone to fill me in, like Lonnie did. I did not see the voltage listed or did I have any idea 13.2 volts is industry standard fuel pump voltage. I was not discrediting their work at all, but other test I've seen listed different flow rates at different voltage. Why do you jump to conclusion that I'm looking for "loop holes" or trying to "discredit" anyones work? This benefits me in no way possible as a consumer.
If you beleive public forums are the end all be all for technical information than we have much bigger issues to worry about. I do realize you can alter voltage to the fuel pump and achieve higher flow rates. So what is your agenda here claytonm, as it appears you joined this forum just to comment on this post?
If you beleive public forums are the end all be all for technical information than we have much bigger issues to worry about. I do realize you can alter voltage to the fuel pump and achieve higher flow rates. So what is your agenda here claytonm, as it appears you joined this forum just to comment on this post?
i have nothing against you, but the post existing at all is accidentally discrediting the work.
Like i said before, its a very straightforward test that was completed by a very respected name in the fuel injection industry. The test was held at industry standards so that the data would be comparable and credible. My agenda is not to bash anyone on here, i make mistakes too, so im no better than you. But the thread was veering off course and needed to be steered back straight.
The most interesting thing I think the results show is how large of a portion of the racing community that the walbro is perfectly fine for. Its the least expensive, and most popular option, and most of the people you see out there modding their cars wont over-power one. But at what point does a bigger pump become necessary? which bigger pump is better for what you are doing? do you need more than one? how much power can you make theoretically before you need the second pump? Up until recently, people would guess, or through out very generalized assumptions like "500hp" whether they were talking about turbo cars or all motor cars. This data sheds a little more light on the optimal ranges of each pump and makes it a little bit less of a swing in the dark.
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Interesting results. I'd like to see those compared to some of the external pumps (IE: A1000 or A2000).
The Amperage draw of the pump while holding the Voltage steady is a rough way to show the actual efficiency curve of the pump/motor combo.
The Amperage draw of the pump while holding the Voltage steady is a rough way to show the actual efficiency curve of the pump/motor combo.