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  1. Replies
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    N54: The pressure to the injectors still needs to be...

    The pressure to the injectors still needs to be controlled. So that when you do a fuel cut, you do not continue to supply fuel to a rail without consumption, you would eventually reach the 245 bar...
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    N54: 54804 This is what I have so far from reading...

    54804
    This is what I have so far from reading the technical documents and eyeballing the pump parts.

    Thing is, there might be a connection between the tip of the FCV - Fuel Control Valve and the...
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    N54: Disclaimer: These are assumptions based off the...

    Disclaimer: These are assumptions based off the technical documents, shoot it down if it's wrong! :awesome:

    When looking at the technical document for the S55 engine, it looks like that fuel pump...
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    N54: I had the one that came with the car, 08 model. I...

    I had the one that came with the car, 08 model. I got a fuel code at the tracks so figured I could replace it and get the newest revision/version.
    As I understand BMW went through a few revisions...
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    N54: I opened my old HPFP after I changed mine to a...

    I opened my old HPFP after I changed mine to a new version.
    And I have to admit, I still dont understand how the fuel meter valve is being used to control the pump flow without causing cavitation...
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    E82/E88: Thanks Alex, I will check this out!

    Thanks Alex, I will check this out!
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    E82/E88: Noise from steering rack

    I have an '08 135i with 180 000km on the clock. Lately after some M3 bits at the front and some track abuse it's started to make a "cracking" noise when steering from lock to lock when stationary. At...
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    N54: I had a spark plug issue a while back causing...

    I had a spark plug issue a while back causing misfire on cylinder 1. When going WOT the car would misfire a few seconds, followed by what seemed like a cylinder shutdown and SES light. Restarting the...
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    N54: AWSAWS, isnt it the other way around? Pumps in...

    AWSAWS, isnt it the other way around? Pumps in series give double the pressure, and pumps in parallel give double flow.
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    N54: When I installed the guibo, I considered which...

    When I installed the guibo, I considered which way it's supposed to be assembled, but quickly figured that it can only go in one way. This is because it has (or atleast the one I got) metal rings...
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    N54: I would say about 25-75ml came out. The HPFP is...

    I would say about 25-75ml came out. The HPFP is oil filled, scared it might come from that via a broken shaft seal.
    I do not know where the vacuum pump dumps the air it pumps, but I guess maybe that...
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    N54: Update: Walnut blasted the intake ports, not...

    Update:
    Walnut blasted the intake ports, not huge amounts of buildup. This did nothing to the vibrations.

    Replaced the coils, spark plugs, injectors, HPFP and changed back to stock transmission...
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    N54: Did a compression test today, just to check that...

    Did a compression test today, just to check that stuff is in order on that front. Got the following results when running the starter motor for five gauge needle movements on each cylinder:
    Cylinder...
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    N54: I'm using the 034 motor sport density line motor...

    I'm using the 034 motor sport density line motor mount set and the UUC Black transmission mounts.
    My old motor mounts were pretty much shot, the new ones were about 10mm higher because the old ones...
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    N54: As far as I understand it, the damper is there to...

    As far as I understand it, the damper is there to save the crankshaft, and the dmfw is there to prevent you from feeling the vibrations that are already there.

    When did this ATI damper get...
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    N54: Yeah, I understand what you mean. The vibrations...

    Yeah, I understand what you mean. The vibrations do not feel like normal engine noise or vibrations, it kinda feels like a quarter misfire on each revolution.
    I will check the work that I did the...
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    N54: I recently replaced guibo, driveshaft carrier,...

    I recently replaced guibo, driveshaft carrier, DMFW, clutch, and diff mount bushings. The problem started when the gearbox and motor mounts were changed. Or the problem was there, but I never noticed...
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    N54: Update: Car is 6mt. When going down a hill in 5...

    Update:
    Car is 6mt. When going down a hill in 5 or 6 gear with 0 throttle, the vibrations still happen when rpm rises to 1800.
    Does this then exclude the injectors? And then uneven compression and...
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    N54: Engine speed dependent vibrations

    I recently replaced my motor and transmission mounts with new slightly stiffer than stock ones. And after that I can feel the motor a lot better, which is a good thing.
    This however has made me feel...
  20. Thread: MHD question

    by mal97
    Replies
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    N54: I tried one of the cheap ebay cables for MHD...

    I tried one of the cheap ebay cables for MHD first, but did not work. Then I tried one of the pre-tested ones, cannot remember what site. That worked perfect.
    Both my cables look identical to the...
  21. N54: Any news on the ball bearing option? :-)

    Any news on the ball bearing option? :-)
  22. Replies
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    N54: Nice explanation, thanks! Further question...

    Nice explanation, thanks!
    Further question though, is it then possible to have the table similar to the load ECT factor use the actual factor in Torque Reduction Factor (Temp) instead via logic...
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    N54: I see your point regarding keeping it slow and...

    I see your point regarding keeping it slow and easy until the oil is up to temp.
    The protection would just be nice, in my opinion, as an added safety, preventing the motor from targeting higher...
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    N54: Dont you have both ECT and OT factors in this...

    Dont you have both ECT and OT factors in this table?
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    N54: Maybe you can trace some of it through when it...

    Maybe you can trace some of it through when it happens.

    Logically, if it only happens at 1100 rpm regardless of speed, its located from the gearbox and forwards, as it is dependent on rpm only....
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