Bosch 44 pump question?
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From: houston
Bosch 44 pump question? Specs show the Bosch 44 inline fuel pump to operate at 72.5psi. If my regulator and rail pressure is 80psi, will the 44 pump supply enough pressure or will my pressure drop to 72.5 , if I instal this pump? Any suggestions?
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From: Norn Iron
The 044, or indeed any pump will try and oeprate at teh pressure determined by the pressure regulator....hence the name.
If there is no restriction applied to the pump, then it will generate no pressure.
And an 044 maintains good flow to a little over 100psi before it starts to tail off. Walbro starts to fall flat after about 75psi.
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From: Norn Iron
It may do, but carries a hefty price...and is apparently only a hand picked and tested 044.
And if you are needing in excess of 7-8bar pressure.....some area of the fuel system is lacking already.
And if you are needing in excess of 7-8bar pressure.....some area of the fuel system is lacking already.
That's not necessarily true.. higher fuel pressures atomize better and therefore normally make better horsepower compared to an = setup of less pressure. Then you can shorten the injection time and that opens a whole new window of being able to play with injection timing (phasing) that can net even more power.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
That's not necessarily true.. higher fuel pressures atomize better and therefore normally make better horsepower compared to an = setup of less pressure. Then you can shorten the injection time and that opens a whole new window of being able to play with injection timing (phasing) that can net even more power.
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Teching In
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It's not just the super high operating pressure. The higher pressure relief valve will cause greater output at moderate pressures. In alot of normal operating conditions, the pressure relief valve is partially open or just starting to open. This bleeds off fuel flow delivery. So with a higher pressure setting, it will be closed until very high pressures are reached.
It's the same principle as the W340 with the relief valve epoxied shut (XP+). Take a look at the flow charts and they show more output at normal operating pressures.
Granted with the 413 it's prolly only a little more flow, and the extra expense doesn't justify the purchase.
