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      06-12-2016, 09:36 AM   #23
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Quote:
Originally Posted by abirmaher View Post
Nowhere specific but over my past few years with BMW's I've just always heard good about Fuel-It.

my apologies, I misread your post....I thought you were referring to the newly released Dinan LPFP. You're correct, Fuel-It is THE go to in LPFP's for the N55


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      06-12-2016, 09:54 AM   #24
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Originally Posted by abirmaher View Post
Nowhere specific but over my past few years with BMW's I've just always heard good about Fuel-It.

my apologies, I misread your post....I thought you were referring to the newly released Dinan LPFP. You're correct, Fuel-It is THE go to in LPFP's for the N55


.
Or at least I hope so. My OEM one died Friday. Planning on putting the fuel it one in today.
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      06-12-2016, 05:07 PM   #25
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Originally Posted by abirmaher View Post
Or at least I hope so. My OEM one died Friday. Planning on putting the fuel it one in today.
Later cars come fitted with same HPFP as m2 part nor 13518604321 - see below

http://www.realoem.com/bmw/enUS/part...231&series=F22

Might be worth replacing your broken Oem HPFP with this new Oem type....
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      06-12-2016, 11:03 PM   #26
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Originally Posted by Bee Pee View Post
Later cars come fitted with same HPFP as m2 part nor 13518604321 - see below

http://www.realoem.com/bmw/enUS/part...231&series=F22

Might be worth replacing your broken Oem HPFP with this new Oem type....
Im talking about my LPFP. Replaced it today running great.
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      06-12-2016, 11:11 PM   #27
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Originally Posted by Bee Pee View Post
Later cars come fitted with same HPFP as m2 part nor 13518604321 - see below

http://www.realoem.com/bmw/enUS/part...231&series=F22

Might be worth replacing your broken Oem HPFP with this new Oem type....
Also just checked and that part number is for the one that my car has which is a 3/14 build. When are you comparing to that the pump changed?
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      06-13-2016, 12:51 AM   #28
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Hpfp part numbers changed for cars built from 2015 onwards
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      06-13-2016, 02:55 AM   #29
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Quote:
Originally Posted by Bee Pee View Post
Hpfp part numbers changed for cars built from 2015 onwards
interesting..... does anyone have more information about new HPFP's if they are rated better than the one it replaced... a data sheet or something?
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      06-13-2016, 11:31 AM   #30
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interesting..... does anyone have more information about new HPFP's if they are rated better than the one it replaced... a data sheet or something?
My bad rechecked and HPFP changeover from old part nr to new part nr was mid 2014 ie build dates June 14 and later.....

No datasheet or product info only that the part nr I quoted above is whats used in M2 so should be capable of working at higher boost/torque.

If BMW M2 HPFP are failing then no doubt BMW will have an OEM fix as a QEP or similar recall that should also be retrofittable on Mx35i's and F3x N55's....
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      06-13-2016, 12:38 PM   #31
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Quote:
Originally Posted by Anas M235i View Post
interesting..... does anyone have more information about new HPFP's if they are rated better than the one it replaced... a data sheet or something?
I tried to get them from a Bosch distributor, but he told me the specs are held confidential between BMW and Bosch.
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      06-14-2016, 02:00 AM   #32
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I tried to get them from a Bosch distributor, but he told me the specs are held confidential between BMW and Bosch.
The struggle continues
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      06-14-2016, 02:03 AM   #33
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Quote:
Originally Posted by Bee Pee View Post
My bad rechecked and HPFP changeover from old part nr to new part nr was mid 2014 ie build dates June 14 and later.....

No datasheet or product info only that the part nr I quoted above is whats used in M2 so should be capable of working at higher boost/torque.

If BMW M2 HPFP are failing then no doubt BMW will have an OEM fix as a QEP or similar recall that should also be retrofittable on Mx35i's and F3x N55's....
I am getting frustrated by this HPFP ..... the VW guys for example are enjoying their cars better from this point of view
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      06-14-2016, 03:18 AM   #34
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Suppose the idea of mounting M3/4 twin vacuum pump c/w 2 x HPFP's, HPF rail and ancilliary plumbing to connect lines from HPFP's to HPF rail has been ruled out ????
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      06-14-2016, 10:47 AM   #35
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Quote:
Originally Posted by Bee Pee View Post
Suppose the idea of mounting M3/4 twin vacuum pump c/w 2 x HPFP's, HPF rail and ancilliary plumbing to connect lines from HPFP's to HPF rail has been ruled out ????
I think the conclusions was that it is cheaper to go with a PI kit and less complicated.

Now if there was a drop in OEM style solution I wouldn't mind spending a little more $$ for that.
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      06-14-2016, 01:00 PM   #36
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Quote:
Originally Posted by Bee Pee View Post
Suppose the idea of mounting M3/4 twin vacuum pump c/w 2 x HPFP's, HPF rail and ancilliary plumbing to connect lines from HPFP's to HPF rail has been ruled out ????
Yes, because you also have to put together the electronics to regulate the 2nd pump.
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      06-14-2016, 02:00 PM   #37
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Quote:
Originally Posted by rwalker
Quote:
Originally Posted by Bee Pee View Post
Suppose the idea of mounting M3/4 twin vacuum pump c/w 2 x HPFP's, HPF rail and ancilliary plumbing to connect lines from HPFP's to HPF rail has been ruled out ????
Yes, because you also have to put together the electronics to regulate the 2nd pump.
Indeed our dme does not control 2 hpfp's.
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      06-15-2016, 01:50 AM   #38
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Looking at how the m3/4 vacuum pump is configured it's similar to n55 unit but with 2 HPFP "ports" as opposed to one.


Plug in connection into vacuum body is the same part between S55 and n55 so not sure what electronics are needed to control a 2nd pump when they are driven off same drive shaft within vacuum pump body.

Both HPFP then tie into the same fuel rail so HPF sensor and regulator sees and controls rail pressure in the same way surely ?
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      06-15-2016, 10:56 AM   #39
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a picture is worth a thousand words:
http://www.atasoyotomotiv.net/image/...OR-800x680.jpg

the shot above illustrates that the pump has an electrical connection for regulation

on the S55, the pumps are regulated separately, and one is secondary, engaged sequentially by the DME

more pics: https://www.google.com/imghp?hl=en&q=bosch+hdp+5
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Last edited by rwalker; 06-15-2016 at 12:45 PM..
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      06-16-2016, 02:44 AM   #40
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RW,

Good info, Thanks. Sounds like it could be a right royal PITA to do any upgrade using OEM parts.

BP
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      06-17-2016, 02:02 PM   #41
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Quote:
Originally Posted by Bee Pee View Post
RW,

Good info, Thanks. Sounds like it could be a right royal PITA to do any upgrade using OEM parts.

BP
So the question still is in the air ..... how come there is no aftermarket products out there that replace the hpfp with higher out put one??

You see for me and i'm sure for alot of guys we dont have access to ethanol or bio fuel at all. So we NEED THIS SO BAAD lol
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      06-17-2016, 02:05 PM   #42
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Quote:
Originally Posted by Anas M235i View Post
So the question still is in the air ..... how come there is no aftermarket products out there that replace the hpfp with higher out put one??

You see for me and i'm sure for alot of guys we dont have access to ethanol or bio fuel at all. So we NEED THIS SO BAAD lol
because it's easier to develop and more profitable to sell upgraded LPFPs and supplemental fuel systems like PI and TBI

it's the same reason we'll never see tuners build something to let us run the S55 fuel pumps on the N55: they're flogging PI systems
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      01-04-2018, 08:11 AM   #43
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Quote:
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So the question still is in the air ..... how come there is no aftermarket products out there that replace the hpfp with higher out put one??

You see for me and i'm sure for alot of guys we dont have access to ethanol or bio fuel at all. So we NEED THIS SO BAAD lol
XDI are working on PnP upgrades for F series N55, S55 etc...

http://www.xtreme-di.com/index_files/HPFP35.htm
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      01-04-2018, 11:33 AM   #44
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The HPFP on my previous car was also cam driven (aka CDFP; I don't know if there are any non-cam driven fuel pumps). If you were mechanically inclined, you could easily swap out the OEM internals of the pump for upgraded internals (<$500, iirc) allowing higher sustained flow/pressures.

It's too bad such an option doesn't seem readily available for us.
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