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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications B58 HPFP mod to N55 possible
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      06-05-2019, 05:21 AM   #1
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Hey y'all there's a thread with a few people that have used the B58 HPFP plunger and modded wiring harness with claims of 13% higher fueling. I'm following the thread and investigating more but if all is true then the XDI $2k HPFP can be skipped.

HPFP New Option https://f30.bimmerpost.com/forums/sh....php?t=1589774
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      06-05-2019, 11:54 AM   #2
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The B58 HPFP is only better because its volumetric efficiency is slightly better than the N55 HPFP. The XDI pump has different sized pistons... I think XDI came in to explain a lot of their engineering & design on that thread.

This doesn't mean that the XDI can be skipped, especially if you're trying to put down serious power.
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      06-05-2019, 12:45 PM   #3
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I have the old school n54 style hpfp, which I know flows better than later 535i's. Would this be benefit over that hpfp?
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      06-05-2019, 08:37 PM   #4
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Quote:
Originally Posted by doodlebro View Post
The B58 HPFP is only better because its volumetric efficiency is slightly better than the N55 HPFP. The XDI pump has different sized pistons... I think XDI came in to explain a lot of their engineering & design on that thread.

This doesn't mean that the XDI can be skipped, especially if you're trying to put down serious power.
True if you're heading for 600 plus. I guess i meant if you're looking for 500whp range. Also yes I read their whole post about the science of fuel flow.
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      06-10-2019, 02:49 PM   #5
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Quote:
Originally Posted by Bmw doubles View Post
True if you're heading for 600 plus. I guess i meant if you're looking for 500whp range. Also yes I read their whole post about the science of fuel flow.
Bro i just installed the XDi 35. Night and Day difference!!!
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      06-11-2019, 03:21 AM   #6
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Quote:
Originally Posted by $howtime456 View Post
Quote:
Originally Posted by Bmw doubles View Post
True if you're heading for 600 plus. I guess i meant if you're looking for 500whp range. Also yes I read their whole post about the science of fuel flow.
Bro i just installed the XDi 35. Night and Day difference!!!
Oh shit car is more responsive, power, etc?
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      06-11-2019, 07:35 PM   #7
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Quote:
Originally Posted by Bmw doubles View Post
Oh shit car is more responsive, power, etc?
Brooo... the delivery once you mash on the gas is crazy.. i havent got it tuned yet.. still on my previous tune but hoping to break 570+ with the new upgrades. I tested the pump on e45 and it held up perfect.
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      06-12-2019, 06:19 PM   #8
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Quote:
Originally Posted by $howtime456 View Post
Quote:
Originally Posted by Bmw doubles View Post
Oh shit car is more responsive, power, etc?
Brooo... the delivery once you mash on the gas is crazy.. i havent got it tuned yet.. still on my previous tune but hoping to break 570+ with the new upgrades. I tested the pump on e45 and it held up perfect.
Do you have a upgraded lpfp?
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      06-13-2019, 09:34 PM   #9
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And we're off to the races.
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      06-14-2019, 10:02 AM   #10
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I still wonder if this flows better than the n54 style hpfp.
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      06-14-2019, 03:25 PM   #11
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Quote:
Originally Posted by ziekxq View Post
I still wonder if this flows better than the n54 style hpfp.
Anything flows better than a N55 hpfp
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      06-14-2019, 03:30 PM   #12
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Quote:
Originally Posted by Bmw doubles View Post
Anything flows better than a N55 hpfp
I guess makes sense why I am hitting 20psi, I just want to know if there will be any benefit for me to this route or if this pump share similar flow to n54 hpfp.
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      06-14-2019, 05:35 PM   #13
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Quote:
Originally Posted by ziekxq View Post
Quote:
Originally Posted by Bmw doubles View Post
Anything flows better than a N55 hpfp
I guess makes sense why I am hitting 20psi, I just want to know if there will be any benefit for me to this route or if this pump share similar flow to n54 hpfp.
I'll datalog and we can go over the results
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      Yesterday, 01:21 PM   #14
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NICE!!!
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      Yesterday, 01:22 PM   #15
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Quote:
Originally Posted by ziekxq View Post
I still wonder if this flows better than the n54 style hpfp.
even if it does the n54 is plunger style so def. cant use it on our motors.
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      Yesterday, 01:24 PM   #16
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Quote:
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Do you have a upgraded lpfp?
yes sir. Precision Raceworks LPFP. Yo have you thought about opting for the Evolution Race Fuel Pump Module. I bought it.. bit on the expensive side but fuel flow was more stable and ekpm3 wasnt collapsing like the oem was.
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      Yesterday, 01:31 PM   #17
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Quote:
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even if it does the n54 is plunger style so def. cant use it on our motors.
My 535i has the n54 style hpfp. Its the early 2011 production car.
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