I was curious how other people were configuring their MSII lag factor with the LC-1. I have the output of the LC-1 set to instant and my lag factor currently set to 100, but I'm not sure if that's a good thing seeing as it is having trouble with megatune's autotune (correction is going up, then down, then up, then down..)
Right now I use simple correction, but eventually I want to switch to PID control. Can the PID handle the lambda sensor at full speed (100 lag)?
What's the best way to tune the lag factor?
Thanks!
Mike
How to configure lag factor with LC-1
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
-
66fb
Re: How to configure lag factor with LC-1
Mike,
In Fuel Set Up/Other Fuel Settings...at the bottom of the menu you can set up to inject more fuel than would be called for by the VE table. You can control how much and how often.
This causes a spike in the O2 reading and by using the logging function you can read the time between the "higher" injector pw spike and the O2 spike and this should be the "transport delay". You figure it for two RPM points.
>EDIT Be sure to turn this feature off when finished <
In Fuel Set Up/Other Fuel Settings...at the bottom of the menu you can set up to inject more fuel than would be called for by the VE table. You can control how much and how often.
This causes a spike in the O2 reading and by using the logging function you can read the time between the "higher" injector pw spike and the O2 spike and this should be the "transport delay". You figure it for two RPM points.
>EDIT Be sure to turn this feature off when finished <
-
msoultan
- Helpful Squirter
- Posts: 58
- Joined: Sun Jun 27, 2004 11:04 am
- Location: Long Beach, CA - USA
Re: How to configure lag factor with LC-1
I was actually curious about the lag factor, not the transport delay. They are also referred to in the manual as "Input Smoothing Lag Factors".
-
msoultan
- Helpful Squirter
- Posts: 58
- Joined: Sun Jun 27, 2004 11:04 am
- Location: Long Beach, CA - USA
Re: How to configure lag factor with LC-1
More specifically, there are a few things I am trying to figure out:
First, the LC-1 has an instant response speed output - is that too fast for the MS?
If I do need to slow it down, should I slow it down on the LC-1 or the MS? Which will yield more accurate results?
How do I discern what is noise vs usable signal?
And is the PID controller meant to handle the full-speed signal from the LC-1 or just the slow oscillations?
Thanks,
Mike
First, the LC-1 has an instant response speed output - is that too fast for the MS?
If I do need to slow it down, should I slow it down on the LC-1 or the MS? Which will yield more accurate results?
How do I discern what is noise vs usable signal?
And is the PID controller meant to handle the full-speed signal from the LC-1 or just the slow oscillations?
Thanks,
Mike
Re: How to configure lag factor with LC-1
Mike,
The LC-1 will never be too fast because MS grabs the O2 only when it needs it, which is every n cylinder events, where you control the n (egocount). This is also the time for the PID calculations.
I would do the averaging in the O2 controller because it can probably be done a lot faster there. I would only average enough to keep the engine oscillations down enough that it isn't too noticeable.
To tell noise from signal, let the car run under steady state conditions/ full speed O2 outputs and look at the fluctuation. If it goes up and down by say +/-0.5 afr, then that is the system noise - some due to the engine and some due to the ego sensor process.
The LC-1 will never be too fast because MS grabs the O2 only when it needs it, which is every n cylinder events, where you control the n (egocount). This is also the time for the PID calculations.
I would do the averaging in the O2 controller because it can probably be done a lot faster there. I would only average enough to keep the engine oscillations down enough that it isn't too noticeable.
To tell noise from signal, let the car run under steady state conditions/ full speed O2 outputs and look at the fluctuation. If it goes up and down by say +/-0.5 afr, then that is the system noise - some due to the engine and some due to the ego sensor process.