Look at my Log.. Questions... (PocketLogger OBDII/2g)

[Zmann42087]

I finally got my old M105 to HotSync so I could get the PocketLogger program back on my Palm. This is the second summer I've had my PocketLogger but I've never got into examining/reading logs that much. Probably because I still have the stock injectors and no AFC so I haven't really needed to. Regardless, I'd like to kinda have a better idea what I'm looking at. I know the basics for a 2g. For instance, on a 2g when the knock sensor detects detonation, the ECU pulls ignition timing. Unlike the 1g loggers where you can actually log knock count but I won't get into that. Anyways, one of the things I'd like to know is what does pulled ignition timing look like? Below you'll find one of my logs.. how does it look? Also, can someone explain the meaning of the numbers associated with the timing parameter? For example, in the log below the timing is at 9. Does this mean that the ignition pulse is being sent 9 degrees before top dead center (BTDC)? Thanks in advance for the help..

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[spyderturbo007]

There isn't really much help I can provide with just the graphs. We need the raw data from the pull. Additionally, you really only want to log rpm, timing, front O2 and airflow during a 2.5k to redline 3rd gear pull.

The less parameters you log, the higher the number of data points.

 

[Zmann42087]

There isn't really much help I can provide with just the graphs. We need the raw data from the pull.

First off, thanks a lot for the reply. Second, what do you mean the "raw data"? Do you want me to upload the actual file of the pull instead of just that screen shot?

Additionally, you really only want to log rpm, timing, front O2 and airflow during a 2.5k to redline 3rd gear pull.

The less parameters you log, the higher the number of data points.

Did not know that. I'll definitely only log the parameters mentioned above next time.

 

[r1991_4g63t]

There isn't really much help I can provide with just the graphs. We need the raw data from the pull. Additionally, you really only want to log rpm, timing, front O2 and airflow during a 2.5k to redline 3rd gear pull.

The less parameters you log, the higher the number of data points.

wouldnt knock be a good idea too? i always log it on mine

 

[Zmann42087]

wouldnt knock be a good idea too? i always log it on mine

Knock is a great idea, but you can't log knock with the OBDII PocketLoggers (on 2g DSMs). You can only log knock with 1g DSM PocketLoggers. So yeah, you're lucky.

 

[snowborder714]

First off, thanks a lot for the reply. Second, what do you mean the "raw data"? Do you want me to upload the actual file of the pull instead of just that screen shot?

By raw data he means numbers. It is most helpful to see a table of numbers to see, for example, what your airflow Hz are at a certain RPM. Graphs are only useful if they are interactive, such as a DSMlink file where you can view the graph (to see an overall correlation between different logged values) and the raw data points.

 

[r1991_4g63t]

Knock is a great idea, but you can't log knock with the OBDII PocketLoggers (on 2g DSMs). You can only log knock with 1g DSM PocketLoggers. So yeah, you're lucky.

sorry ill shut up now

 

[Zmann42087]

By raw data he means numbers. It is most helpful to see a table of numbers to see, for example, what your airflow Hz are at a certain RPM. Graphs are only useful if they are interactive, such as a DSMlink file where you can view the graph (to see an overall correlation between different logged values) and the raw data points.

Man, I feel like I have so many questions..

Just to clarify, you would like me to arrange my log data like people have here and here? If thats what you want, I could just plug the raw data in a Excel spreadsheet for you guys.

Also, I was looking again at the parameters spyderturbo recommended and throttle position wasn't included. TPS really isn't needed?

Lastly, back to a question in my original post.. could someone please explain the meaning of the numbers associated with the timing parameter? For example, in the log I attached the timing is at 9. Does this mean that the ignition pulse is being sent 9 degrees before top dead center (BTDC)?

 

[snowborder714]

Man, I feel like I have so many questions..

Just to clarify, you would like me to arrange my log data like people have here and here? If thats what you want, I could just plug the raw data in a Excel spreadsheet for you guys.

Also, I was looking again at the parameters spyderturbo recommended and throttle position wasn't included. TPS really isn't needed?

Lastly, back to a question in my original post.. could someone please explain the meaning of the numbers associated with the timing parameter? For example, in the log I attached the timing is at 9. Does this mean that the ignition pulse is being sent 9 degrees before top dead center (BTDC)?

That's ok to have a lot of questions. You ask - we answer!

Yes, that would be the way we'd like your data posted. Here's a tech article to help you with that:
http://www.dsmtuners.com/forums/art...st-logs-so-people-can-actually-read-them.html

You can log TPS if you'd like to. I'd try it with and without and see if you get enough data with it. It's nice to have, but not entirely important.

The numbers associated with timing deal with timing advance. Your goal is to get this number as high as possible without any signs of knock. Since you have no way to log knock, you'll want to be more conservative with your tune.

 

[spyderturbo007]

Also, I was looking again at the parameters spyderturbo recommended and throttle position wasn't included. TPS really isn't needed?

No need to log TPS anymore. I noticed that in your graph, the ECU is reporting a TPS value of ~98%. Once you verify that the TPS is >95%, there isn't a reason to keep logging that parameter anymore.

You can export the data from PLViewer if I remember correctly into a text file, but I don't have any old logs on this computer to check. Either that, or a spreadsheet is fine. Just make a 3rd gear pull, from 2.5k to redline, logging the parameters I listed above and we'll get you all fixed up.

 

[Zmann42087]

No need to log TPS anymore. I noticed that in your graph, the ECU is reporting a TPS value of ~98%. Once you verify that the TPS is >95%, there isn't a reason to keep logging that parameter anymore.

You can export the data from PLViewer if I remember correctly into a text file, but I don't have any old logs on this computer to check. Either that, or a spreadsheet is fine. Just make a 3rd gear pull, from 2.5k to redline, logging the parameters I listed above and we'll get you all fixed up.

Sounds good.. I'll log the parameters you mentioned sometime in the next day or so and post it up. Thanks again for the help guys!