More logged data - timing, MAP, load
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From: Zulu Alpha Tango Foxtrot
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More logged data - timing, MAP, load
Ok, since I've bought my digimoto I've been logging a lot of data. Today I downloaded and tried another program that works with the elmscan tool - obd2crazy. Its a decent version of the logging software. The main reason I tried this was because for some reason my digimoto will not log the MAP sensor data properly.....have to contact them and see if its a bug or whatnot....
Anyhow, here are some graphs of data that was logged with the software:
Timing vs load. Data is plotted on seperate Y axis for a better comparison. As the engine load increases, timing decreases.
Timing vs MAP sensor. Data is plotted on seperate Y axis for a better comparison. As you can see from the graph, as the MAP pressure increases, the timing decreases. Almost a direct inverse relationship
MAP vs load. This is a key plot. This shows that the engine load is virtually identical to the MAP sensor.
What does this mean? It means that the ECU calculates engine load off of the MAP sensor. This has been discussed before at a few other forums, but I wanted to make everyone aware of this. When you use the E-manage, SAFC, or VAFC to adjust the MAP signal for larger injectors - you are affecting how the ECU sees load. This means that if your MAP voltage is halved (as an example), your ECU would see less load. This plays a big part in timing. As you can see from the graphs above, as the MAP pressure increases (greater load), the car decreases timing (to decrease chances of knocking).
Anyhow, here are some graphs of data that was logged with the software:
Timing vs load. Data is plotted on seperate Y axis for a better comparison. As the engine load increases, timing decreases.
Timing vs MAP sensor. Data is plotted on seperate Y axis for a better comparison. As you can see from the graph, as the MAP pressure increases, the timing decreases. Almost a direct inverse relationship
MAP vs load. This is a key plot. This shows that the engine load is virtually identical to the MAP sensor.
What does this mean? It means that the ECU calculates engine load off of the MAP sensor. This has been discussed before at a few other forums, but I wanted to make everyone aware of this. When you use the E-manage, SAFC, or VAFC to adjust the MAP signal for larger injectors - you are affecting how the ECU sees load. This means that if your MAP voltage is halved (as an example), your ECU would see less load. This plays a big part in timing. As you can see from the graphs above, as the MAP pressure increases (greater load), the car decreases timing (to decrease chances of knocking).
Last edited by opto_isolator; Apr 25, 2004 at 01:27 PM.
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From: Arizona
Rep Power: 326 yes that is tru but the emange will also prevent you from seeing too high of pressure, seeing that the map is not designed for pressure at all, setting the voltage limit at the max load point will not hurt performance, but will help it.
Also, the emanage has the ability to retard ignition timing. i've been wainting on my emanage and all the harnesses, they'll be here by thursday. I'm hitting a dyno up that sunday for a run untuned. then after a tuning i'll dyno again and we'll figure out the tru potential of the emanage.
Also, the emanage has the ability to retard ignition timing. i've been wainting on my emanage and all the harnesses, they'll be here by thursday. I'm hitting a dyno up that sunday for a run untuned. then after a tuning i'll dyno again and we'll figure out the tru potential of the emanage.
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From: Zulu Alpha Tango Foxtrot
Rep Power: 312 Originally posted by MadWheel
yes that is tru but the emange will also prevent you from seeing too high of pressure, seeing that the map is not designed for pressure at all, setting the voltage limit at the max load point will not hurt performance, but will help it.
yes that is tru but the emange will also prevent you from seeing too high of pressure, seeing that the map is not designed for pressure at all, setting the voltage limit at the max load point will not hurt performance, but will help it.
Also, the emanage has the ability to retard ignition timing. i've been wainting on my emanage and all the harnesses, they'll be here by thursday. I'm hitting a dyno up that sunday for a run untuned. then after a tuning i'll dyno again and we'll figure out the tru potential of the emanage.
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From: Zulu Alpha Tango Foxtrot
Rep Power: 312 I've contacted the guy from Digimoto about fixing the MAP sensor logging bug that I think exists - they are looking into it and will attempt to fix it in a week (so he claims).....the graphs from the digimoto software look much nicer. The other elmscan software packages aren't bad - considering they're freeware, but need some development.
Other thing to note is that the damn OBDII interface is freakin' slow! I sure wish that when they developed this thing they would have used a higher speed communications protocol. I'm guessing its around 9600 Bps.....
Other thing to note is that the damn OBDII interface is freakin' slow! I sure wish that when they developed this thing they would have used a higher speed communications protocol. I'm guessing its around 9600 Bps.....
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From: Zulu Alpha Tango Foxtrot
Rep Power: 312 Originally posted by Havok2k1
Nice!!!!
I asked to show the correlation of all three.....
I gots to get me one of dem dere thangs....
Nice!!!!
I asked to show the correlation of all three.....
I gots to get me one of dem dere thangs....
Last edited by opto_isolator; Apr 27, 2004 at 01:01 PM.
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