[detroitm2]

Nostrum just released updated pricing on their N55 HPFP. Its now $1350, and I'm told there is a lifetime warranty. (They're working on a new website, which should reflect the warranty details).

proTUNING Freaks should have the data they need to add it to the HPFP dropdown on available OTS maps, so it's on them to release an update.

https://www.nostrumshop.com/product/bmw-n55-hpfp-kit/

[Raymondo1234]

Originally Posted by detroitm2

Nostrum just released updated pricing on their N55 HPFP. Its now $1350, and I'm told there is a lifetime warranty. (They're working on a new website, which should reflect the warranty details).

proTUNING Freaks should have the data they need to add it to the HPFP dropdown on available OTS maps, so it's on them to release an update.

https://www.nostrumshop.com/product/bmw-n55-hpfp-kit/

Is this expected to be available in MHD also?

[detroitm2]

Originally Posted by Raymondo1234

Is this expected to be available in MHD also?

Im not sure to be honest. I was only involved for the BM3 tuning. I can check for ya and let you know.

[detroitm2]

Originally Posted by Raymondo1234

Is this expected to be available in MHD also?

MHD support is in the works. No word on ETA yet, but I'll update here once I know.

[Raymondo1234]

Originally Posted by detroitm2

MHD support is in the works. No word on ETA yet, but I'll update here once I know.

Thanks for checking. Much appreciated.

[F87source]

Originally Posted by detroitm2

Nostrum just released updated pricing on their N55 HPFP. Its now $1350, and I'm told there is a lifetime warranty. (They're working on a new website, which should reflect the warranty details).

proTUNING Freaks should have the data they need to add it to the HPFP dropdown on available OTS maps, so it's on them to release an update.

https://www.nostrumshop.com/product/bmw-n55-hpfp-kit/

I'll correct the main post later.

[F87source]

Updated the main post, I should also mention that spool calculates their flow likely incorrectly for the n55 because they base it on cam lift which only applies to the b58 as the b58 hpfp is driven off the cam. The n55 hpfp is driven off of the back of the vaccumn pump which is timing chain driven. I should double check this.

So that also did mess me up because it led me to believe for the longest time that the n55 was the same way which is absolutely not true.

[ZM2]

Originally Posted by F87source

Updated the main post, I should also mention that spool calculates their flow likely incorrectly for the n55 because they base it on cam lift which only applies to the b58 as the b58 hpfp is driven off the cam. The n55 hpfp is driven off of the back of the vaccumn pump which is timing chain driven. I should double check this.

So that also did mess me up because it led me to believe for the longest time that the n55 was the same way which is absolutely not true.

Good to know. Are you able to properly calculate apples-to-apples flow bn the various pumps?

[F87source]

Originally Posted by ZM2

Good to know. Are you able to properly calculate apples-to-apples flow bn the various pumps?

Maybe but I think the answer is going to be no. Because spool talks about the pump cam lobe lift, are they talking about the lobe inside of the vacuum pump which is doing the lifting of the tapper at the bottom of the HPFP? Or are they referring to the B58 where the HPFP is actually driven off of the cam shaft - which is how everyone seems to be calculating these things because I think they developed these things for the b58 and then just ported it over to the n55 second and as a result calculations were done the same way. But if the are talking about the cam lobe in the vaccum pump: https://prussianmotors.com/2013-2017...e92-f10-28149/

Then spool is calculating it correctly.


Dorch is clear they are calculating on cam shaft so their data is wrong. "The table below serves as a reference for maximum fuel flow in cubic centimeters per camshaft revolution for various N55 fuel pump options. These calculations are based on the N55 cam lobe. Each engine will have varying fuel flow capacities depending on the lift and number of lobes on the camshaft."


Nostrum gives a LPH chart based on rpm but it is unclear how they calculated their numbers or if they give a measurement.


So in summary even comparing CC/rev is not accurate because the stroke distance changes if you use the wrong cam profile and thus less volume is pumped so you can't even compare it that way. So yeah now that I am looking into this area more cautiously I see the callous mistake I made before assuming the HPFP is also driven off of the cam shaft like the b58 when it does not, it is driven off of the vaccumn pump which is on the opposite side of the engine compared to the head so there is no way it can be cam driven (it is also driven by a chain so yeah dead give away if I had decided to look at the vaccum pump assembly earlier) - I am kind of beating myself over the fact that I didn't notice that before. Well that's what happens when you don't fully research a topic and just rely on manufacture data I suppose.

But what I said about the s55 is still true 2 hpfp's driven off the the chain which again is spun by the crank hub, and a mechanical water pump (I believe is belt driven or might be chain driven I actually never looked) also driven off of the crank hub provides alot more mass (and thus inertia it must overcome to do said speeding up and slowing down) that it has to spin up and slow down might be the reason why the S55 is much more proned to spinning the hub than an n54 and n55.

[Pray for Mojo]

If the N55 drives the HPFP off the vacuum pump, is it a myth then that the TU pump will damage anything other than maybe the vacuum pump with its wider spring. People were talking like TU pump would damage the cam over time.

Starting to wonder if it isn't partial misinformation by pump companies that invested a ton of R&D to be leg swept by DIYing an OEM part.

[F87source]

Originally Posted by Pray for Mojo

If the N55 drives the HPFP off the vacuum pump, is it a myth then that the TU pump will damage anything other than maybe the vacuum pump with its wider spring. People were talking like TU pump would damage the cam over time.

Starting to wonder if it isn't partial misinformation by pump companies that invested a ton of R&D to be leg swept by DIYing an OEM part.

For the n55 the pump won't damage anything except for the vaccumn pump if it does damage anything at all.

Now on the b58 that's where cam damage becomes a reality because the pump is driven off of the cam. This could be a weakness on the b58, but we will see.

[Pray for Mojo]

Originally Posted by F87source

For the n55 the pump won't damage anything except for the vaccumn pump if it does damage anything at all.

Now on the b58 that's where cam damage becomes a reality because the pump is driven off of the cam. This could be a weakness on the b58, but we will see.

The myth was around using the TU pump on the N55. It always seemed suspect to me, but it became gospel based on conjecture from so and so who knew a guy that designs HPFPs.

[F87source]

Originally Posted by Pray for Mojo

The myth was around using the TU pump on the N55. It always seemed suspect to me, but it became gospel based on conjecture from so and so who knew a guy that designs HPFPs.

Oh I missed the tu part, I don't think the concern would be damaging the cams, I think the concern would be damaging the fuel injectors because the tu hpfp operates at a significantly higher pressure (iirc) than the n55 hpfp's.

Also the way the b58 hpfp has to be modified to fit the n55 looks really sketchy.

[Pray for Mojo]

Originally Posted by F87source

Oh I missed the tu part, I don't think the concern would be damaging the cams, I think the concern would be damaging the fuel injectors because the tu hpfp operates at a significantly higher pressure (iirc) than the n55 hpfp's.

Also the way the b58 hpfp has to be modified to fit the n55 looks really sketchy.

It runs at lower bar on the N55s, you can reclock the connector easily with a screw driver, but the baseplate cutting is still fugly. I have one of the pumps, I originally planned to install on the N55, but I also have an X3 with the B58 that I will probably install it on.

[F87source]

Originally Posted by Pray for Mojo

It runs at lower bar on the N55s, you can reclock the connector easily with a screw driver, but the baseplate cutting is still fugly. I have one of the pumps, I originally planned to install on the N55, but I also have an X3 with the B58 that I will probably install it on.

Not the connector but the baseplate cutting and how little material holds it down, along with trimming of the manifold.

[Pray for Mojo]

Originally Posted by F87source

Not the connector but the baseplate cutting and how little material holds it down, along with trimming of the manifold.

Trimming the manifold was only because no one figured out to pop the connector and rotate it. The baseplate is ugly, I imagine it could be done better by someone with metal fabricating skills. You still have to bend the fuel lines to account for the difference in baseplate thickness.

Looking at the S55 vs N55, the vacuum pump timing sprocket and timing chain are identical parts, the S55 vacuum pump looks to be similar to the N55, except for the twin HPFP mounting locations.

I can't see how the TU pump would damage anything on an N55 other than maybe the vacuum pump cam, it certainly isn't going to add more load to the timing system than a two pump setup.

[F87source]

Originally Posted by Pray for Mojo

Trimming the manifold was only because no one figured out to pop the connector and rotate it. The baseplate is ugly, I imagine it could be done better by someone with metal fabricating skills. You still have to bend the fuel lines to account for the difference in baseplate thickness.

Looking at the S55 vs N55, the vacuum pump timing sprocket and timing chain are identical parts, the S55 vacuum pump looks to be similar to the N55, except for the twin HPFP mounting locations.

I can't see how the TU pump would damage anything on an N55 other than maybe the vacuum pump cam, it certainly isn't going to add more load to the timing system than a two pump setup.

Yeah it probably won't, but all those modifications make that pump seem so sketchy to me.

[detroitm2]

Looks like the Nostrum HPFP is available on BM3 now.

[F87source]

Originally Posted by detroitm2

Looks like the Nostrum HPFP is available on BM3 now.

Very nice.

[boldy1]

I have got the nostrum HPFP installed on my car now and will start tuning with it next week via Ecutek 🙌

[detroitm2]

Originally Posted by boldy1

I have got the nostrum HPFP installed on my car now and will start tuning with it next week via Ecutek

Whose doing your tuning?

[boldy1]

Originally Posted by detroitm2

Whose doing your tuning?

Originally Posted by detroitm2

Whose doing your tuning?

Indigo-gt here in the UK. Been waiting for a custom turbo to intercooler pipe to come, its arrived now so will be fitted on Tuesday.

They know how to tune a car so we will see what they can get out of the setup for me