A'PEXi BNR32 Fuel Pump
I
had RC Engineering test my fuel pump that I
purchased from SR Motorsports.
SR modifies the pump to accept the stock "sock" pickup filter, which
makes it pretty easy to install. This was the original SR "Ultimate"
fuel pump, but I think they are selling another pump now.
I had RC test the pump at 13.2 volts because I could then compare it to the
Bosch pump. However, I am quite sure it does not get 13.2 volts while it is
installed in the car with the stock wiring. I plan to upgrade the wiring and do
some before and after testing to see what voltage it will really be operating
at. But I haven't done that yet...
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Here is a flow graph, showing flow in gallons per hour versus gauge pressure:
I was really happy when I saw this. This is "one hell of a pump",
as RC's Russ Collins put it. You will notice that the graph stops at 75 psi. The reason for this is that
the pump has an internal pressure regulator that limits pressure to 75 psi. If
you go over this pressure, flow drops off very quickly. Don't use this pump if
you plan to run more than 75 psi of fuel pressure.
Here is the full data sheet:
| Volts: |
13.2 |
| Test Fluid S/G: |
0.76 |
| Fluid Temp: |
72 |
Horsepower value @ BSFC of 0.6 is shown in last column at right.
(Note that 0.65 is more appropriate for a rotary, so the BHP values are
about 10% higher than should be expected for this application. Also this does
not take into account the pressure drop from the fuel system plumbing.)
| PSIG |
Amps |
Lbs/Hr |
Gal/Hr |
Ltr/Hr |
Ltr/Min |
CC/Min |
Gr/Min |
Gr/Sec |
BHP |
| 35 |
11.4 |
506 |
84.33 |
319.24 |
5.32 |
5320.73 |
3825.39 |
63.76 |
843.3 |
| 40 |
11.5 |
498 |
83.00 |
314.20 |
5.24 |
5236.61 |
3764.91 |
62.75 |
830.0 |
| 45 |
12 |
494 |
82.33 |
311.67 |
5.19 |
5194.55 |
3734.67 |
62.24 |
823.3 |
| 50 |
12.7 |
493 |
82.17 |
311.04 |
5.18 |
5184.03 |
3727.11 |
62.12 |
821.7 |
| 55 |
13.2 |
493 |
82.17 |
311.04 |
5.18 |
5184.03 |
3727.11 |
62.12 |
821.7 |
| 60 |
13.6 |
485 |
80.83 |
305.99 |
5.10 |
5099.91 |
3666.63 |
61.11 |
808.3 |
| 65 |
13.9 |
463 |
77.17 |
292.11 |
4.87 |
4868.57 |
3500.31 |
58.34 |
771.7 |
| 70 |
14.2 |
433 |
72.17 |
273.19 |
4.55 |
4553.12 |
3273.51 |
54.56 |
721.7 |
| 75 |
14.5 |
402 |
67.00 |
253.63 |
4.23 |
4227.14 |
3039.15 |
50.65 |
670.0 |
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