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  1. #1
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    Some N54 fuel pump testing at various voltages

    Hey guys,

    Had a chance to do some exploratory flow testing with a new stock pump generously on loan from RB. For this testing I used a simple rig. A variable voltage XP800 power supply, AM regulator set at 72psi, an iPhone timer, and an empty 2 liter bottle of diet coke. Each voltage was tested 2-3 times and averaged. Std deviation was quite low.

    Based on the testing @ 14v, the factory voltage, I came up with a theoretical whp curve. But the important thing here isn't the measured LPH or my theoretical power estimate. It's the flow and current variance at each voltage. Based on this testing I'd say this pump is an excellent candidate for increasing flow via increasing voltage. Which isn't surprising but always nice to verify. Click here to enlarge
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    Now those #'s look a bit more realistic to what customers are doing!!

    2 additional comments

    1. you forgot to add the Mtn Dew to your list of equipment

    2. Im ready when you are Click here to enlarge

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    Nice work terry! So do you think that something a little more complex then a simple BAP is needed to achieve the higher voltage?
    2008 BSM 335i coupe - JB4, BMS intake, meth : Weekend warrior.

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    niceeeee
    JB4LIFE

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    Great way to display the info! Was the pump getting really warm with the extra current draw?

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    Click here to enlarge Originally Posted by indy99gpgt Click here to enlarge
    Nice work terry! So do you think that something a little more complex then a simple BAP is needed to achieve the higher voltage?
    A basic BAP definitely works. Although the interface isn't really ideal because as a stand alone it provides only basic on/off operation and the voltage adjustment is fixed via a dial. Also the unit itself is sort of large and clunky. But it will be good enough for dyno testing.. Click here to enlarge

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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    Great way to display the info! Was the pump getting really warm with the extra current draw?
    It seemed OK but it was sitting in 3 gallons of fuel.

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    How much voltage can the pump actually handle?

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    When will you be taking this to the dyno? And any idea how this will affect the longevity of the pump?

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    I'll send the off the shelf BAP I have sitting around here over to LM for some dyno testing shortly. No idea on longevity but it will only be running the higher voltages for those few seconds you're making more than 450rw. So I don't foresee any issues. For kicks I left the pump on at 18v for a few minutes and it handled that just fine. Likely all we need to raise the fuel ceiling up a bit is 16v.

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    I'll send the off the shelf BAP I have sitting around here over to LM for some dyno testing shortly. No idea on longevity but it will only be running the higher voltages for those few seconds you're making more than 450rw. So I don't foresee any issues. For kicks I left the pump on at 18v for a few minutes and it handled that just fine. Likely all we need to raise the fuel ceiling up a bit is 16v.
    You are telling all that has been necessary to get more fuel is to raise the pump voltage?

    WTF has it taken forever to get to this point?

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    You are telling all that has been necessary to get more fuel is to raise the pump voltage?

    WTF has it taken forever to get to this point?
    It's just the next thing to test. If LM or one of these guys were here on the local dyno I would have tried it months ago. But as more and more cars get to this level of power getting more fuel for them will become increasingly a higher priority. Click here to enlarge

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    It's just the next thing to test. If LM or one of these guys were here on the local dyno I would have tried it months ago. But as more and more cars get to this level of power getting more fuel for them will become increasingly a higher priority. Click here to enlarge
    Click here to enlarge

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    It's just the next thing to test. If LM or one of these guys were here on the local dyno I would have tried it months ago. But as more and more cars get to this level of power getting more fuel for them will become increasingly a higher priority. Click here to enlarge
    It just seems incredibly ridiculous that this has not been done prior to this point.

    Is it simple to up the voltage?

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    As simple as buying a $250 BAP and plugging it in. Click here to enlarge


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    Well I'm looking forward to seeing the results with this. These pumps seem to be fragile so I hope it all goes well.

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    Damn, wish I had some extra cash and a dedicated shop......

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    By the way, you seem to be giving about 50 hp per volt. Does it really stay steady like that?

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    You get that thing shipped out to LM today Terry? Hopefuly he can get some dyno runs in this week or next and prove that this is a viable solution. With there only being a couple people to reach power levels that require this extra fuel and the availability of meth, I'm not surprised it's taken so long to get here.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    By the way, you seem to be giving about 50 hp per volt. Does it really stay steady like that?
    He is calculating HP off of LPH (Liters per Hour), not voltage. And yes, there would be a point to where increasing voltage draws more amps but does not flow much more, just like over-spinning a turbo.

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    Click here to enlargeClick here to enlargeClick here to enlarge

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    Click here to enlarge

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    A basic BAP definitely works. Although the interface isn't really ideal because as a stand alone it provides only basic on/off operation and the voltage adjustment is fixed via a dial. Also the unit itself is sort of large and clunky. But it will be good enough for dyno testing.. Click here to enlarge
    So would you be making a stream line unit? And "NICE WORK MY MAN!!"

  24. #24
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    If it works we'll make something specifically for the N54. Click here to enlarge

  25. #25
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    Looks promising. I would assume running the car beyond 14v at low fuel levels would be the worst case operating conditions for the pump. They rely on the fuel to keep them cool but once it drops to a minimum it might affect its characteristics.

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