Thread: HPFP swap
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hardparker hardparker is offline
Junior Member
Posts: 57
Join Date: Nov 2017
Car: F25
Default 03-03-2019, 09:36 AM

Originally Posted by houtan
Nice work.

So is the N55 hpfp (hdp5) in your car the weaker pump or the stronger one in the early e series N55s (2011 and early 2012)? Just trying to gauge if the b58 would be an upgrade for those cars or if it would even fit.
The N54 and early N55 pumps are stronger than the standard N55 HDP5. The B58 plunger style pump won't fit to replace those rotary style ones.

Originally Posted by bmw63
do you have any info on the S55 pump? I know it has 2 but what is the piston size, flow etc if we use one of them? they are direct bolt on and wiring is the same.
The S55 pump is an HDP5 pump. I suspect it's equivalent to the N55 pump, thus the need to use two of them on the S55.

F25 X3 35i M Sport | Pure Stage 2 turbo + inlet | UR de-catted thingy | VRSF Race IC | FTP full thingies | BM3 PTF tuned | XDI-35 HPFP | Stage 2 LPFP | Ethanol mixed | WMI | Oil cooler | xHP | 50iX brakes
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