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Originally Posted by IMR-Merlin
Are you telling me that the Bosch 044 is the high water mark for inline fuel pumps?
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Do some research. For the price point, it probably is - the JDM tuner guys seem to think so. One shop benched Walbros against 044's and published graphs. The 044 flowed more fuel at higher pressures than the Walbro was capable of ever, under any circumstance - and drew less current.
It's factory fitment on GT3's. It was factory (albeit a different factory) fitment on 500+HP Cosworth's. The WRC rally guys use them. It's widely used in motorsport.
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I would think that a high revving NASCAR engine or a 2000 HP drag car would be running a higher flow rate than a 265 lph 044.
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LOL. Then go buy a fuel pump for a 2000HP drag car, if it makes you feel happier.
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If you are fine with the single 044, then why the redundant system with 2 pumps? Is there an issue with pump cavitation and losing pressure under max flow? I am just curious as to the benefits of 2 equal rate pumps performing the same task a 1 higher flow pump.
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The reason for two fuel pumps is flow goes down as the pressure requirement goes up. CIS wants a system pressure of ~6-8 bar, depending on year.
Using two lower spec fuel pumps - as they factory did - enables them to meet both requirements.
But EFI more typically runs at 3 bar than 8 bar.
Fitting two pumps - in series - if one will do the job increases, not reduces, the chance of failure.
What happens if a pump dies? Exactly the same as the overboost protection kicking in. You have a pump forcing gas through a dead pump. Or a dead pump at the tank restricting flow to the good pump. You're in limp home mode.
The WRC rally guys and the endurance racers run multiple 044's - but they're in parallel. Because a single pump will do the job, and the extras are there for redundancy.