Quite nice fuel pump comparison here 
https://www.realstreetperformance.co...t-performance/
https://www.realstreetperformance.co...t-performance/
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Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project -
Charts saved to the forum.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project -
That's quite a comprehensive and detailed test! I like how they did that, and they found some interesting figures there - some of the pumps made nowhere near what the were meant to at 40psi
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I was interested to read about the effect of voltages on the pump and can echo this as from recently adding a relay and much thicker power supply and earth wire to my pump, measured flow went up 100ml per minute for free (at no resistance - measuring it coming out of open pipe)
The other thing that article shows is that the horsepower a lot of those pumps are capable of are pretty big power... Standard pumps more than capable of even moderate power increases.
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Walbro 525 seems to be quite a monster.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - ProjectComment
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Yop, Hellcat is monster...Walbro succed in this test very good for...I will be using 450. Thuppu do you know differences between old 450 pump and new one?Audi Coupe Quattro 2.3 20VComment
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No, I don't have experience with walbro pumps(just have been using lph255 as lift pump to surge tank). Have been using Bosch 044's as pressure pumps.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - ProjectComment
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