N54 Dual HPFP
- Thread starter NoQuarter
- Start date
@NoQuarter are you doing your own tuning? If so, try raising your Fuel Pressure Target table to 22 (2200psi) along the 135 row. You may need to right click the table and change the max allowed value to something like 25. I believe the max value in the public XDF is set to only 20.
This will help with the large swings in rail pressure
This will help with the large swings in rail pressure
No, the large swings in rail pressure are because the base duty cycle and PID are calibrated for an n54 pump and his main pump is an N55 cam style. Also, the cam sync harness electronics need some work still.
Thanks for reaching out with the tip. As Jake said, this look pretty erratic at the moment but is expected. That said, @BQTuning has it looking pretty good with what he has to work with.
I thought the unit in the fuel target pressure table was mPa ? I also have huge swings in fuel pressure running single barrel shotgun.
Try raising the target to 22 across the board in that last row and it should smooth out.
Way back in August, This is what we had in mind on how the fuel pump needs to operate:
Yesterday, @bahn and I recorded this on my running Z4 with the S55 fuel pump:
Yesterday, @bahn and I recorded this on my running Z4 with the S55 fuel pump:
Testing continues. Current status is the engine idles and revs very nicely. Still working out keeping pressure up under load.
Below is the testing rig - you see a couple scope probes going into the cabin, the various plugs for the CAM sensor, pumps, DME, power, and the electronics being tested.
Below is the testing rig - you see a couple scope probes going into the cabin, the various plugs for the CAM sensor, pumps, DME, power, and the electronics being tested.
Hello . How is progress? Is it working ? Thinking about replacing too - need information .
Still making progress on this. Just delayed with normal life stuff.
This is some testing being done just a couple days ago
This is some testing being done just a couple days ago
Perfect! Very interesting what needs to be done so that all this works ... While looking for a used M4 pump .
Just as a precaution, I would not recommend buying S55 pumps at the moment. We are not at a place of knowing if this is going to work, and what it would take to make it work in total. I bought a set of pumps because I'm expecting to be guinea pig #2 if this gets far enough along that we need a second car in for testing.
Filippo
Thanks ! I will not rush in this case . Until spring, there is a lot of time, and in winter in Russia we don’t particularly drive ))
I'd like to say a few things about this project, as well as how this kind of thing tends to work. This may be insightful for people not directly involved in advancing this effort, but that are interested in where this goes and possibly be a benefactor of a positive result.
@NoQuarter initially undertook the idea of trying to figure out how to get the S55 dual HPFP to work on the N54 with native DME control. This is not a commercially-oriented project. What do I mean by this? The end goal was not trying to bring a product to market, but rather the interest in pursuing and solving this problem. Could products on the other side of a solution? Maybe. But it's neither here nor there. In many ways, this smells like an open source project - take that statement directionally, not literally.
So how does that work? @NoQuarter had begun dialoging with a few of us about this effort. In part with the help of the Spoolstreet forum, a collection of people were gathered on a private thread. Over time a few additional people were added. The effort moved along, @NoQuarter leading it and various people pitching in where they could provide help.
The project has been non-trivial and a number of people have pitched in: tuning, fabricating, electronics, etc. There is some spin-off work that has occurred during this period, some of this effort hopefully moving ideas and knowledge forward to bring more solutions to the platform.
When the group had enough sea legs and something to share, this thread was started. Of course there is an interest to share this stuff in public. The sausage-making ... is better suited to the small group. A bunch of the conversations happen in two's or three's ... depending on what work is being performed and who is in the mix solving a particular problem. It's just the usual nature of work.
There is a pretty good group of folks on tap, helping to push this forward. Fingers are crossed but no one is holding their breath. Hopefully we'll have good news to share as we go forward
Filippo
@NoQuarter initially undertook the idea of trying to figure out how to get the S55 dual HPFP to work on the N54 with native DME control. This is not a commercially-oriented project. What do I mean by this? The end goal was not trying to bring a product to market, but rather the interest in pursuing and solving this problem. Could products on the other side of a solution? Maybe. But it's neither here nor there. In many ways, this smells like an open source project - take that statement directionally, not literally.
So how does that work? @NoQuarter had begun dialoging with a few of us about this effort. In part with the help of the Spoolstreet forum, a collection of people were gathered on a private thread. Over time a few additional people were added. The effort moved along, @NoQuarter leading it and various people pitching in where they could provide help.
The project has been non-trivial and a number of people have pitched in: tuning, fabricating, electronics, etc. There is some spin-off work that has occurred during this period, some of this effort hopefully moving ideas and knowledge forward to bring more solutions to the platform.
When the group had enough sea legs and something to share, this thread was started. Of course there is an interest to share this stuff in public. The sausage-making ... is better suited to the small group. A bunch of the conversations happen in two's or three's ... depending on what work is being performed and who is in the mix solving a particular problem. It's just the usual nature of work.
There is a pretty good group of folks on tap, helping to push this forward. Fingers are crossed but no one is holding their breath. Hopefully we'll have good news to share as we go forward
Filippo
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