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Type: Posts; User: murfie

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  1. Are you using the PMAS MAF data and getting that...

    Are you using the PMAS MAF data and getting that much error? It is probably more important to get that correct first than to mess with VCT with that error in your air model. If the O2's are showing...
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    DD torque or ETC torque plus the torque needed...

    DD torque or ETC torque plus the torque needed for the engine to idle is the scheduled/ indicated torque that comes from the torque model(MBT). Idle has a reserve so it's not always using MBT in its...
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    Pay attention to your MBT value. When you go from...

    Pay attention to your MBT value. When you go from 10* detonation limited, to 15* detonation limited, yes the ECU will think you are making 100hp less.
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    Mostly No... in certain conditions/ RPMs maybe....

    Mostly No... in certain conditions/ RPMs maybe. Kinda one of those user preference things with pedal feel.
    With a FI application you might see something like:
    at 3000RPM you might have a maximum...
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    HCCI, is basically MBT at 0 advance or TDC. No...

    HCCI, is basically MBT at 0 advance or TDC. No added loss to the compression stroke. The entire charge ignites all at once so you don't need the advance to achieve the smooth cylinder pressure rise...
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    I'm probably being to general in how I'm using...

    I'm probably being to general in how I'm using the pumping loss terminology.

    I think of the process as a single cylinder with net gain and loss of energy.
    I see how having the valves closed in...
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    The engine is has four strokes, some sort of...

    The engine is has four strokes, some sort of pumping loss happens in all of them, as the engine is always pumping, even when both the valves are closed. During the intake and exhaust stroke you have...
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    WOT lambda table values don't matter too much on...

    WOT lambda table values don't matter too much on a stock car that should be going into COT protection.
    Get rid of that COT and look at the values in the MBT lambda modifier table that lower the MBT...
  9. stock is returnless. The fuel flow comes from...

    stock is returnless.
    The fuel flow comes from being the unknown in the ratio relationship of the target lambda and airflow. Rail Pressure is inferred from fuel flow.

    If fuel returned to the...
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    Looks more like voltage is erratic giving you an...

    Looks more like voltage is erratic giving you an erratic injector offset, not so much temperature based, but alternator control is kinda based on inferred battery temperature. Make sure you have a...
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    Its normal for pistons to rattle to one degree or...

    Its normal for pistons to rattle to one degree or another, it mostly goes undetected, and causes very minimal wear, but engines need proper clearances, and things tend to take the path of least...
  12. Thread: Math parameters

    by murfie
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    .155 is number, you probably want .156 for %....

    .155 is number, you probably want .156 for %. Then I'm not sure why you are squaring it the result of your average. You would only get positive numbers, making everything rich or lean look lean?? not...
  13. I would start by raising the limits in your SD....

    I would start by raising the limits in your SD. you will probably need to raise your MAP monitor IPC table values as well.

    89871

    Then rescale your torque model from the stock ones, or use...
  14. Ignore that last post, I was looking at the wrong...

    Ignore that last post, I was looking at the wrong tune file.
  15. This tune is for a return style fuel system and...

    This tune is for a return style fuel system and E85. you are just running a BAP?

    If you are on the stock returnless with a BAP, you would need to redo the fuel rail pressures, and injector data....
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    I think it says "react./ after decel", reaction...

    I think it says "react./ after decel", reaction kinda covers both meaning it's getting fuel from what the transient tables are saying.

    You might want to try new O2 sensors, it can show that fuel...
  17. I exported the visable range of that log that has...

    I exported the visable range of that log that has the WOT part. I do this so I can use the view entire in the graph. This allows you to look at the + and - views not just the average.

    Max error
    ...
  18. The best way I can describe it is axis values...

    The best way I can describe it is axis values should be evenly spaced over the range you will use. If you saw an RPM axis that went 500,900, 1750, 2000, 4000, 4250, 5750, 7000. And not...
  19. I would suggest redoing your period axis of your...

    I would suggest redoing your period axis of your MAF. Not having the resolution between 126u and 107u, and relying on interpolation to determine airmass is going to be hard to get the curve to fit...
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    Screen shot looks like down shift torque...

    Screen shot looks like down shift torque reduction.

    Would need to see a log of a launch from a dig, or screen shot of the launch.
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    When you are looking at LTFT, as you are, the...

    When you are looking at LTFT, as you are, the entire view works ok. Just keep in mind LTFT works out of KAM cells that define ranges of air flow, so it works on sections of the transfer. It becomes...
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    lambda is a ratio Phi is a ratio Where they...

    lambda is a ratio
    Phi is a ratio
    Where they become an equivalence ratios is:
    actual AFR/ target AFR. The ratio of two ratios, giving a defined point at which they could be equal.

    Ford uses...
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    It's simply divide with EQ ratio where you would...

    It's simply divide with EQ ratio where you would multiply with lambda, inverse. Not just invert the ratio.

    The names are wrong, but really the problem is the predefined math eq err% that uses...
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    Phi is what dodge uses.

    Phi is what dodge uses.
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    Ford uses lambda, GM uses EQ ratio. They are the...

    Ford uses lambda, GM uses EQ ratio. They are the inverse of each other. Both target 1.0 as stoic. out side of that they mean the opposite. The PIDs should say lambda for Ford vehicles as that's what...
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