BMW N55 and N20 HPFP Capabilities – Navardi Tuned

Understanding the BMW N55 and N20 HPFP Capabilities

G'day guys, 

Today I would like to discuss the capabilities of the HPFP (High Pressure Fuel Pump) used on the N55 and N20 engines.

The HPFP better known as the BOSCH HDP 5 is a mechanically driven high pressure fuel pump driven by the camshaft on the N20 and a separate module that is chain operated via the crankshaft on the N55. 

A lot of the N55 community already know how weak the stock HPFP Pump is even on a stock turbo. What a lot of the N20 community isn't aware of is that the HPFP is also a severe limiting factor in making sizeable power on a stock turbo and through to larger turbo setups. Typically you'll see the EWG equivalent Motors max the HPFP earlier than the PWG cars. 

The HDP 5 Revision BMW chose to install on the N55 and N20 is the 200 BAR capable unit. That means the pump has been tested and rated to be able to provide a continuous 200 Bar of fuel pressure to the common rail and to the 6x or 4x HDEV5.2 BOSCH 1050cc (@100BAR) Injectors.

For the N55 this means being just able to supply enough fuel for around 15 - 18 PSI mid range with boost tapering into the high rpm range on 98 RON (93 Octane). This is however also dependant on the associated bolt on intakes, inlets and downpipes. As performance inlets, intakes and downpipes allow a turbo to flow more air and more air requires more fuel.

Where this becomes a problem for the N55 and N20 is commonly in the 3000 - 4500 RPM range, as the cam drive that operates the piston on the HPFP isn't spinning fast enough to force the pump to provide more fuel flow. Combine that with an ethanol mix that's too highly concentrated for your boost level and users will see the fuel rail pressure drop, which causes the injectors to starve and the car starts to misfire. Usually the misfire is enough for users either to have their tune revised to avoid that scenario or they look to upgrade the fuelling system. Luckily the N55 is well looked after in the fuelling upgrades department, with HPFP, PI and CPI upgrades.  

On the N20 its a little more complicated, firstly on 98 RON (93 Octane) the N20 won't see any fuelling related challenges until the turbo flows around the 36 - 42 lbs/min mark or the ~ +/- 10%, 420 Crank HP range - Note this is based on a Dyno Dynamics figure as its the dyno we use as a baseline for any R&D. However what we have also seen is in colder climates this HPFP limit can be lower as the colder air has more oxygen content in it thus requiring more fuel (We have seen in -5 to 5 Deg C on stage 1 turbo's the HPFP dip at just 22psi in the 3000 - 4000 RPM Range!). On ethanol mixes, typically the Stock turbo can be seen to max out the stock HPFP on mixes greater than E40 on the 28i model BMW's or E60 on the 20i model BMW's. To run Full E85 even on a stock turbo N20, you either need to run boost around the 16-18PSI mark (28i models are primarily referenced here), or install fuelling upgrades. Thankfully the N20 finally has some love in this department, with HPFP, PI and CPI upgrades now available. 

If a user continues to push the car without the necessary adjustments in the tune or the fuelling upgrades to avoid HPFP dip that has been discussed, then some of the damage that can occur is:
- Damaged injectors usually in the form of stuck/leaky Injectors (a leaky injector can cause hydro lock if its severe enough).
- Piston ring/Piston crown damage.
- Piston Skirt Damage.
- Spark Plug damage.

What we have seen on some tunes in the community is that they try to limp around the HPFP limitation by asking the HPFP to run at a higher pressure say 248 BAR (24 mPa) instead of 200 BAR, or they try to run as close to max power lean as they can (usually only done on ethanol mixes due to the cooling factor of the fuel). However these "band-aid" fixes don't bowed well for the life of the motor, asking the HPFP to run at a pressure above its certified and designed pressure rating severely reduces the lifespan of the pump. On top of that, increasing the pressure output of the HPFP doesn't actually increase the HPFP volumetric flow, it does however increase the flow rate of the injectors, but the injectors aren't the limiting factor in this situation. The risk to also try and run at max power lean for a given fuel allows for the chance that the combustion chamber gets that little bit too hot for whatever reason (sudden drop in fuel pressure, that little bit of boost spike, or hot IAT's to name a few), and your engine is sent to kingdom come with nothing left but a huge mess and the cost of engine builds/swaps.

Its worth noting too, being these are 4 cylinder motors they are under considerably more stress and load per cylinder than their 6 cylinder counterparts. A N55 running 24PSI is only 4 PSI per cylinder, where as the 4 Cylinder is running 6PSI per cylinder, the increased force within the combustion chamber creates more heat. Besides running "cold air intakes" or "big Intercoolers" or "sitting the turbo within its peak efficiency range" or "Meth/CP Injection" a primary focus on these 4 cylinder motors especially on stock cast pistons is to run as close to "Max power rich" as possible. This helps minimise piston ring damage from excessive heat, or injector damage as DI injectors are easily prone to heat damage. 

If you're facing HPFP limitations or seeing/experiencing some unpleasant results on your car, its important you get it checked out ASAP to avoid potential irreversible damage.

I hope this Blog post has been informative to you (The Reader), and look forward to discussing more BMW Tuning related topics in future with you. 

Max Power Lean = Running the leanest AFR during WOT that makes the most power, it is the most efficient use of fuel but provides minimal protection to combustion heat.

Max Power Rich =  Running the richest AFR during WOT that makes the most power, It isn't the most fuel efficient way to tune, but provides superior heat mitigation to the cylinders over "Max Power Lean". Stock Cast pistons do not like hot environments, it can cause cracked pistons and damaged piston rings etc.

Peace Out and Enjoy! 

8 comments

  • download facebook spy tool

    ]

    download mysql server for windows 10 64 bit freeantivirus trial version for pc free downloaddownload windows xp recovery disk cd freedownload halo 2 highly compressed pc freedownload mct for windows 10download disney hercules game for windows 10devil may cry 1 free download pcfraps download windows 10download software center windows 10botim app download for pc windows 10
    [url=https://bestsmiles.net.ru/download-slingplayer-for-windows-10-slingplayer/]free download on screen keyboard windows 10
    [/url]
    [url=http://hkszfwdh.blogspot.com/2021/05/group-policy-editor-windows-10-home.html]draw io download for windows 10
    [/url]
    [url=https://mixpresent.ru/dolby-advanced-audio-v2-lenovo-drivers-lenovo-g580/]mobogenie for pc windows 7 ultimate free download
    [/url]
    [url=https://fundamentservis.ru/msi-x99s-gaming-7-drivers-x99s-gaming-7/]messenger for windows 10 pc download
    [/url]
    [url=https://chromebrowser.ru/free-download-excel-2010-for-windows-10-microsoft/]euro truck pc game download for windows 10
    [/url]
    [url=https://fundamentservis.ru/oracle-database-mobile-server-oracle-database/]sims 4 free download pc windows 7
    [/url]
    [url=https://bestsmiles.net.ru/download-quicktime-7-7-9-for-windows-10-download/]download total commander windows 10
    [/url]
    [url=https://fundamentservis.ru/brazilian-players-fifa-15-fifa-15-ultimate-team/]dvd decoder windows media player 10 free download free
    [/url]
    [url=https://chromebrowser.ru/free-offline-pc-games-download-for-windows-10/]skype for windows xp service pack 3 free download free
    [/url]
    [url=https://chromebrowser.ru/ecm-titanium-download-windows-10-ecm-titanium-1-61/]snagit free download for windows 8 free
    [/url]
    kgb archiver download for pc windows 10
    download creative sound driver for windows 7 free
    microsoft dot net framework 4.0 free download for windows xp free
    csc exe download windows 10
    download microsoft windows media player 9.0 free

    https://chromebrowser.ru/free-download-adobe-acrobat-dc-for-windows-10/
    https://chromebrowser.ru/free-download-skype-for-windows-10-64-bit-full/
    https://bestsmiles.net.ru/download-vbscript-for-windows-10-vbscript-dll/
    https://chromebrowser.ru/firefox-download-latest-version-for-windows-10-64/
    https://chromebrowser.ru/free-galaga-download-windows-10-galaga-download/

    download usb tool windows 10
    best bus simulator games for pc free download
    halo 2 pc download full version free windows 7
    cisco packet tracer 5.3 3 free download for windows 10
    itunes latest version free download for windows 10

    free download winzip for windows 10 64 bit
    oracle sql plus 8.0 free download for windows xp free
    download hp p1102 driver for windows 10
    dino d day download free pc
    digimon masters pc game download

    download ludo game full version for pc
    gta vice city full game download for pc windows 10
    codec download for windows 10
    download octagon for windows 10
    free download nvidia control panel windows 10 32 bit

    https://rd-ok.ru/download-windows-10-student-discount-windows-10/
    https://bestsmiles.net.ru/download-utility-software-for-windows-10-what-is/
    https://rd-ok.ru/download-vlc-media-player-for-windows-10-pro-vlc/
    https://rd-ok.ru/download-windows-10-for-32-bit-operating-system/
    https://rd-ok.ru/download-windows-10-1607-iso-download-windows-10/

    game software for pc free download [/url] download lame mp3 encoder for windows 10 [/url] free download for pc windows 10 [/url] clock wallpaper for windows 7 free download free [/url] office 2019 free for windows 10 [/url] 10 pc os download [/url] screenshot for pc windows 7 [/url] imagine fashion designer pc game for free [/url] game download for windows 8 free [/url] creed game free download for pc windows 10 [/url]
    Annasysfat
  • .net framework 1.1 download windows xp freedownload windows xp pro startup disk freebest survival games for pc free downloadmicrosoft management console download windows 7 freedragon city windows 10 downloadhalo 2 for windows 10 downloaddownload unix for windows 10download windows 10 pro free 64 bitmtp usb device driver download windows 7 freebubble bobble game free download for pc full version
    [url=https://chromebrowser.ru/focusrite-control-download-windows-10-focusrite/]eclipse juno download for windows 64 free
    [/url]
    [url=https://rd-ok.ru/download-windows-10-with-product-key-iso-download/]download oracle database 11g for windows 10 64 bit
    [/url]
    [url=https://fundamentservis.ru/fallout-new-vegas-hardcore-mode-reward-hardcore/]windows home server 2011 download free
    [/url]
    [url=https://chromebrowser.ru/free-download-zip-file-reader-for-windows-10-zip/]download arial narrow font windows 10 free
    [/url]
    [url=https://rd-ok.ru/download-windows-10-usb-dvd-download-tool-windows/]download windows 10 64 bit update 2019
    [/url]
    [url=https://bestsmiles.net.ru/download-photoshop-cc-for-windows-10-adobe/]cant download windows 8.1 free
    [/url]
    [url=https://fundamentservis.ru/fallout-4-beta-1-5-fallout-4-154-available-on/]download microsoft fix it for windows xp sp3 free
    [/url]
    [url=https://rd-ok.ru/download-windows-update-reset-script-for-computers/]foxfire download windows 10
    [/url]
    [url=https://chromebrowser.ru/free-fire-pc-game-download-windows-10-garena-free/]kms activator windows 10 free download
    [/url]
    [url=https://fundamentservis.ru/verizon-v-cast-media-manager-verizon-wireless/]download picasa 3.9 for windows 10
    [/url]
    download windows 10 pro for workstations iso
    download windows xp drivers for dell free
    lenovo vantage download windows 10 64 bit
    4×4 off road games for pc free download
    windows loader 2.2.1 free download free

    https://fundamentservis.ru/windows-10-looks-ugly-how-to-fix-the-blurry-fuzzy/
    https://bestsmiles.net.ru/download-previous-versions-of-windows-10-how-to/
    https://bestsmiles.net.ru/download-virtual-router-for-windows-10-download/
    https://fundamentservis.ru/sound-blasterx-ae-5-drivers-sound-blasterx-ae-5/
    https://chromebrowser.ru/free-graphic-design-software-download-for-windows/

    malayalam font for windows 10 free download
    download free fire pc windows 10
    everio mediabrowser 2 download for windows 10
    download nvidia driver for windows 7 32 bit free
    download windows 10 build 15063

    tunein radio free download for pc windows 7
    nokia pc suite download windows 10
    fast copy download for windows 10
    download photoshop for pc windows 10
    download windows 10 for linux

    pdf windows 98 download free
    windows 8.1 free game download free
    download and install firefox for windows 10
    arcade games collection for pc free download
    realtek audio driver free download for windows vista free

    https://chromebrowser.ru/eclipse-free-download-for-windows-10-64-bit/
    https://bestsmiles.net.ru/download-themes-for-windows-10-pc-10-best-free/
    https://rd-ok.ru/alien-shooter-3-game-free-download-for-windows-10/
    https://chromebrowser.ru/forza-horizon-for-windows-10-free-download-forza/
    https://chromebrowser.ru/free-download-zip-file-reader-for-windows-10-zip/

    definition audio device windows 10 driver download [/url] pads 24 free download pc [/url] typing software free download for windows 10 [/url] racing pc free download [/url] explorer windows vista 32 bit download free [/url] xp notepad free download free [/url] 3 driver windows 10 download [/url] download for windows 8 free [/url] 3d cursors for windows xp free [/url] pc suite 64 bit windows 7 download [/url]
    Annasysfat
  • download the latest version of java for windows 10download windows 10 64 bit full version microsoftmkv video player free download for windows xp freenessus download free windows freeipa keyboard download windows 10davinci resolve windows 10 downloadcanon dpp download windows 10download latest realtek audio drivers windows 10download war mode pc freemodern combat 5 pc download free windows 7
    [url=https://fundamentservis.ru/armed-and-dangerous-download-buy-armed-and/]download software free for windows 10
    [/url]
    [url=https://fundamentservis.ru/dell-optiplex-3010-bios-optiplex-3010/]after effect free download for windows 10
    [/url]
    [url=https://fundamentservis.ru/what-is-road-munching-in-waze-driving-app-waze/]dragon city download for windows 10
    [/url]
    [url=https://fundamentservis.ru/pioneer-avic-5200nex-firmware-update-map/]best pc games free download car racing
    [/url]
    [url=https://fundamentservis.ru/amd-a10-4600m-benchmark-amd-a10-4600m-apu/]internet explorer 10 windows xp 32 bit download free
    [/url]
    [url=https://fundamentservis.ru/qualcomm-atheros-ar9485-802-11b-g-n-wifi-adapter/]download wireless driver windows xp free
    [/url]
    [url=https://fundamentservis.ru/harvey-birdman-attorney-at-law-psp-harvey-birdman/]eset nod32 antivirus free download windows 10
    [/url]
    [url=https://fundamentservis.ru/msi-990fxa-gd80-manual-msi-990fxa-gd80-series/]google chrome free download windows 10 32 bit
    [/url]
    [url=https://fundamentservis.ru/replay-media-catcher-6-key-download-replay-media/]disney hercules game free download full version for pc
    [/url]
    [url=https://fundamentservis.ru/toshiba-satellite-c55d-a5108-toshiba-satellite/]compass free download for windows 7 free
    [/url]
    free download virus free games for pc
    korean keyboard windows 10 download
    avira pc cleaner download free
    powerpoint 2003 download free windows 7 free
    download launcher pc windows 7

    https://fundamentservis.ru/asus-pce-ac56-driver-windows-10-asus-pce-ac56-2/
    https://fundamentservis.ru/tauren-chieftain-warcraft-3-warcraft-iii-reforged/
    https://fundamentservis.ru/battlefield-4-freezing-ps3-battlefield-3-freezing/
    https://fundamentservis.ru/samsung-bd-p1590-firmware-update-how-you-can/
    https://fundamentservis.ru/garageband-6-0-free-download-for-mac-garageband/

    avg pc tuneup 2017 full version free download with crack
    call of duty ghosts pc game free download
    data usage monitor for pc free download
    download free mystery case games for pc full version
    bluestacks download windows 10 32 bit

    windows defender for windows xp sp3 download free
    free download world of warcraft game full version pc
    download glassfish v2.1 for windows free
    download visual c++ redistributable windows 10 64 bit
    windows hello driver download free

    windows server 2012 download vhd free
    ashes cricket 2015 pc game free download
    hp simplepass fingerprint reader download windows 10
    download latest version of pdf reader for windows 10
    air hockey pc game free download

    https://fundamentservis.ru/ben-yedder-fifa-16/
    https://fundamentservis.ru/amd-radeon-hd-8350g-amd-radeon-hd-8350g/
    https://fundamentservis.ru/epson-stylus-nx105-driver-epson-stylus-nx105/
    https://fundamentservis.ru/corsair-link-not-detecting-h80i-corsair-link-not/
    https://fundamentservis.ru/south-park-stick-of-truth-trainer-download-south/

    free download for pc [/url] scanner software for pc free download [/url] city wars download pc free [/url] km 1650 driver download windows 10 [/url] eos utility for windows 7 download free [/url] download pc windows 7 [/url] driver vga intel windows 10 64 bit [/url] free download for windows xp professional sp3 free [/url] pc games list free download [/url] lide 120 driver windows 10 64 bit download [/url]
    Annasysfat
  • камень знака зодиака
    камни знаков зодиака водолей
    для знаков зодиаков камни
    камень знака зодиак овен
    камни скорпион знак зодиака

    https://hubsternews.blogspot.com/2021/05/blog-post.html
    https://aboutnews2k.blogspot.com/2021/05/blog-post.html
    https://znacheniyerun.blogspot.com/2021/05/blog-post.html

    чароит камень знак зодиака
    какой камень знаки зодиака
    камень знаки зодиака рыба
    камни знаки зодиака лев
    знаки зодиака телец камни

    [url=https://bopsneeews.blogspot.com/2021/05/blog-post.html]знаки зодиака камни рыбы
    [/url]
    [url=https://bopsneeews.blogspot.com/2021/05/blog-post.html]камень талисман знаку зодиака
    [/url]
    [url=https://bopsneeews.blogspot.com/2021/05/blog-post.html]знаки зодиака камень тельца
    [/url]

    терагерц камень знак зодиака
    знаки зодиака камень дерево
    знак зодиака какой камень
    знаки зодиаки драгоценные камни
    знаки зодиака из камня

    Annasysfat
  • ] Ukagaq zxu.rmqn.navardituned.com.tjx.xn http://slkjfdf.net/

    aseacall

Leave a comment