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    Lean Start Problem with pre-2003 OS

    The 2002 OS 02030003 has the same problem as previously seen in the 2003+ OS. When I enable semi closed loop, table A0008 has no effect. When in open loop, I can command an overly rich condition to...
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    The 2002 OS 02030003 has the same problem. When I...

    The 2002 OS 02030003 has the same problem. When I enable semi closed loop, table A0008 has no effect. When in open loop, I can command an overly rich condition to compensate the mismatch in commanded...
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    I think that if the maf falls below the fail...

    I think that if the maf falls below the fail frequency, the PCM uses its input immediately and sets a history code. Still need to confirm this though.
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    In the end I will probably not use the maf. When...

    In the end I will probably not use the maf. When I drive the car with the turbos initialy on low boost I am going to use it. I just heard someone say they were tuning like this and I wanted to...
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    Interesting. Do you have a link to this. I looked...

    Interesting. Do you have a link to this. I looked and only saw them for mustangs and they were only 80 mm.
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    Joe, you can set the fail frequency to 15000 Hz...

    Joe, you can set the fail frequency to 15000 Hz so it will hit 512g/s before it hits the fail freq. It will be stuck on 512 g/s thereafter. And yes you don't need the maf but some tuners want them on...
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    Ok, I have more info. If you exceed 512 g/s the...

    Ok, I have more info. If you exceed 512 g/s the computer won't know how much more air is coming in but will not set a code. If you exceed the fail frequency, code is set and program defaults to using...
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    Ttt

    Ttt
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    What is the max maf frequency you are seeing @ 7...

    What is the max maf frequency you are seeing @ 7 psi?
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    Check the burst knock tables as well.

    Check the burst knock tables as well.
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    People have been tuning forced induction (LS1)...

    People have been tuning forced induction (LS1) with the maf and pegging it for the last 4 or 5 years. SD is the new kid on the block :) Seems to make me think that the maf sets a trouble code and...
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    Now wait a minute. Then how do people tune a...

    Now wait a minute. Then how do people tune a forced induction motor with the maf? They use PE vs RPM. But at some point the maf maxes and I suppose defaults to sd mode (or something). Or what is the...
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    Oh, yes I see what you are saying now. That could...

    Oh, yes I see what you are saying now. That could be a problem. I was asking about it because someone said they were doing it this way.

    My maf will be on the shelf but I might light the motor...
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    Any more thoughts??

    Any more thoughts??
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    The accepted method to cause the computer to go...

    The accepted method to cause the computer to go into SD mode is to set the fail frequency to 1. This causes no reset etc as you speak of. I don't think it matters as far as functionality if you set...
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    Maf and custom op. sys. 3

    If one wanted to use the maf with cus. op. 3 and 2 bar map, is it possible? Meaning if you wanted to use the maf and set the fail freq to say 8000. When the frequency is surpassed, would it default...
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    I agree with you. Now that I think about it it...

    I agree with you. Now that I think about it it makes good sense to have it set up this way. Rather than having it command a fixed spark for a fixed boost level. May be a bit harder to initially tune...
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    This is not clear. I am sorry, I was not...

    This is not clear.

    I am sorry, I was not thinking correctly, spark is a function of airflow. Duh. Is it possible to exceed the max airflow in the tables?
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    Spark Boost retard table

    I just want to clarify. It states in the documentation that the boost timing table is subtracted from the values of the final timing. Is the base timing (of the final timing) taken from the 105 kpa...
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    It may also be useful as a safety mechanism. If...

    It may also be useful as a safety mechanism. If your fuel pressure drops, you could have the PCM retard the timing severely and cut off the fuel like a rev limit. That is what I would like to use it...
  21. Thread: emissions

    by hpcubed
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    I think custom OS 3 should not look for the maf...

    I think custom OS 3 should not look for the maf at all ! :grin:

    How bout it Ross?
  22. Thread: Injector PWs

    by hpcubed
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    You are correct. There seems to be a bunch of...

    You are correct. There seems to be a bunch of redundency with the short pulse time limit. According to EFILive
    "When a very short injector on time is commanded (between 0 - 4mS) the PCM will add...
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    Have you seen the same situation that I described...

    Have you seen the same situation that I described in my first post? I don't mean it just reads lean which would cause me a lot of concern. I see it go to 20.9% which is regular air. Seems that would...
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    Sorry for the lack of information. I am running...

    Sorry for the lack of information. I am running it N/A right now. It did the same thing with my high comp. 346. This motor is 9:1 with no boost. No wideband to compare to (no dyno). I am just...
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    Seems like I would here it ping if it was...

    Seems like I would here it ping if it was detonating. And get some KR.
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