BUSCHUR RACING

WRX/STI DOUBLE-PUMPER

Buschur Racing WRX/STI Double-Pumper ReviewFew may remember the short period of time where Buschur Racing was developing hard-core solutions for the Subaru market. Unfortunately much of this development was done at a time when Subie enthusiasts were more interested in the sound from their blow-off valves than real performance. Today, things have definitely changed and high-performance, bighorsepower STIs are a reality. Buschur Racing’s “Double Pumper” for the Subaru 2002-2013 again delivers the goods at a very affordable price. Much like the EVO X design, the modified Walbro GSS340 pumps feed into a Y fitting below the hat. This allows use of the factory fitting up top. The factory feed line or a -6AN line can be used. On the flow bench, this system also performed very well. To our surprise, the single outlet performed better than the individual lines run into a tee on the flow bench. Again, the modified pumps showed some of the least flow loss as operating pressures increased. Feeding fuel to a 750+whp EJ25 running 35psi of boost pressure should be no problem for this setup. A core exchange is required.


SPECS

MANUFACTURER:  Buschur Racing
PART NUMBER:  SUB-40000
DESCRIPTION:  Double Pumper for Subaru
VEHICLE APPLICATIONS: 2002-2013 Subaru Impreza WRX and STI

NUMBER OF FUEL PUMPS: 2
FUEL PUMP MANUFACTURER: Walbro
FUEL PUMP PART NUMBER: GSS340 28912-1

FUEL PUMP INLET TYPE: Snap Fit Sock
FUEL PUMP OUTLET TYPE: 5/16″ / 8mm
FUEL HAT OUTLET #1: 5/16″ / 8mm
FUEL HAT OUTLET #2: N/A
FUEL HAT RETURN #1: 5/16″ / 8mm
E85 Compatible (Y/N): YES

MSRP: $450.00


Buschur Racing WRX/STI Double-Pumper Review

FUEL CURVE SLOPE -28lph/10psi @ 12.5V | -30lph/10psi @ 14.0V

Boost Pressure 0 5 10 15 20 25 30 35 40 45 50 55
Operating Pressure 45 50 55 60 65 70 75 80 85 90 95 100
Flow (lph) 12.5V 390 371 356 341 329 314 300 283 275 258 246 228
Amps 12.5V 17.8 18.6 19.6 20.4 21.2 22.2 23 24 25 26.2 27.2 28.2
WHP (gas) 12.5V 1042 992 952 911 879 839 802 756 735 690 658 609
WHP (E85) 12.5V 802 763 732 701 676 646 617 582 565 530 506 469
Flow (lph) 14V 460 444 430 415 401 385 370 355 339 326 312 299
Amps 14V 19 20 21 22 23 24 25 26 26 27 28 29
WHP (gas) 14V 1230 1187 1149 1109 1072 1029 989 949 906 871 834 799
WHP (E85) 14V 946 913 884 853 825 792 761 730 697 670 642 615
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