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fuse rating for fuel pump?

PHATR32

By PHATR32,
in Engines & Forced Induction

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pnblight Mentor

pnblight

Posted
Posted
Your on a dreamboat. The highest i could get out of the stocker was 420rwhp with same injectors as you and same computer. Same as everyone else 400-440 seems to be the limit of a good stock healthy pump .

BUT what regulator were you running at the time.(after market or std)

pnblight Mentor

pnblight

Posted
Posted
Im running a HKS regulator but is running very low base fuel pressure 30psi.

Well that my be the difference as i run a std reg and i remember a thread some time ago which i think sydneykid show bench test of different fuel pump and the gtr std pump was right up there but if you increase the pressure it start to really loose the volume it could flow (if the pressure goes up the total fuel flow went down quiet a bit ) i believe this is why i still run quiet high duty cycle times on 700cc for the hp i make as the fuel pressure is std.

Sydneykid had a great chart of different fuel pumps.

rob82 Mentor

rob82

Posted
Posted

Make sure you use equal gauge wire to the ground as well. Make it a positive trigger relay(I know it sounds trivial but I worked on a 520 rwhp WRX today running two 044 and the system run a negative trigger relay with a tiny ground cable and the entire fuel system including braided lines was active as it was doing the grounding-very scary as we saw sparks as we were putting the c16 in). The bosch 044 pump is rated at 30amps peak but usually they usually only run 12-17 amps from memory. So a 30 amp fuse should be sufficient.

Cubes Grand Master

Cubes

Posted
Posted

pnblight is on the ball.

As pressure increases flow drops off. You will always get more HP out of a pump if you run larger injectors rather than run the smaller items and try to squeeze that little bit more out of them with an increase of fuel pressure.

pnblight Mentor

pnblight

Posted
Posted
Well i played with the fuel pressure on the dyno and it helped slightly but that was it. I have some standard regs i can try but i dont think its going to make a difference.

it was only a suggestion as mine has never failed me ,not that i have tried get as much as i could out of it ,i just never needed to upgrade yet but i'm sure down the road somewhere i will. Sydneykid even did some calculation from the bench test results he had and the flow rate from the std pump was there for the hp i'm running(the thread was back some months ago)

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