Simple math crew checking in:
ID1000cc injector @ 87% DC, ~14v, and 72.5psi (for example) flows ~1000cc/min.
Therefore 4 of these injectors is 4000cc/min.
1000cc per liter
60 minutes per hour
cc/min * 0.06 = liter/hour
4000cc/min = 240lph
A DW300 flows ~255lph at 72psi.
A while ago, I used Injector Dynamics' online calculator to get some basic horsepower capabilities for ID1000s at various fuel pressures. ID1000s at 70psi will support ~750bhp on gasoline at 70psi, or ~550bhp on E85.
Since the DW300 will flow enough fuel to support the flow capacity of the injectors, we can therefore say that a single in-tank Deatschwerks DW300 fuel pump will support 650+whp on gasoline.
Someday I will decide to crack 500whp on E85. Probably not with the 2871R, but as soon as I can actually get my hands on a twin-scroll BW 7064 .92a/r I'll switch over and see what that turbo will do at high boost. Since 240lph is a safe number for 400whp, 25% more fuel is 320lph. The DW300 will clear 325lph, but only at 30psi, so I'll use a DW300 in the tank and an external Bosch 044 to knock the fuel pressure up to ~90psi. This is the smart way to do a big power fuel system, since the track crew knows the importance of having the OEM fuel sock in the OEM location in the tank.