What is the load algorithm?
Jul 5, 2006, 12:00 PM
#31
Originally Posted by chmodlf
This is a quote from Evo4Mad (EvoScan programmer) found on openecu.org:
"Ok this is a calculation that I have found that works, this will do until we work out more about Evo8 Roms. Basically exactly what was suggested above already:
The ecu is doing something similiar to this:
load = Airflow weighted for both temp and pressure = air mass/rev
Load = Air Velocity/Rev * Air temp * barometer (0.00486xBar) * 0.625 (128th bar) / 4"
My .02 (chmodlf):
In my mind it seems that this is a more complete formula because it takes into account more variables than just MAF and RPM.
Even though I have looked high and low and most "definitions" of load are MAF and RPM I highly doubt that it is that simple of an algorithm. But I could be wrong.
"Ok this is a calculation that I have found that works, this will do until we work out more about Evo8 Roms. Basically exactly what was suggested above already:
The ecu is doing something similiar to this:
load = Airflow weighted for both temp and pressure = air mass/rev
Load = Air Velocity/Rev * Air temp * barometer (0.00486xBar) * 0.625 (128th bar) / 4"
My .02 (chmodlf):
In my mind it seems that this is a more complete formula because it takes into account more variables than just MAF and RPM.
Even though I have looked high and low and most "definitions" of load are MAF and RPM I highly doubt that it is that simple of an algorithm. But I could be wrong.
Absolutely, the forumla is not just as simple as MAF HZ and RPM. Barometric pressure and temperature as well as a few other variables may be involved. I simply gave a simplified equation that you can use with just MAF Hz and RPM.
After all the Mitsu Karman MAF measure air volume. That has to first be converted in air mass, using an equation that involves the cross sectional area of the MAF being used, the temperature and barometric pressure. That's why the Mitsu MAF also has a baro and temp sensor.
But, anyway, since we don't know the exact formula at this time, I simply made the variables into a constant that worked for my setup. Other people should be able to do this to while slightly adjusting that constant value.
Eric
Last edited by l2r99gst; Jul 5, 2006 at 12:04 PM.
Jul 6, 2006, 01:10 PM
#32
Alright I have just started using this formula that l2r99gst devised and have a few questions. Now before people get all worked up over my numbers, I am running a 3065 to 27psi.
Now on my most recent log (about 20 minutes ago) I have noticed that at 7047 rpms I am pulling in 2450hz of air. Now if we calculate all of this out using the formula I am in the load area of 296.21. Ok that seems pretty normal.
Now going down in the lower rpms right after full boost I get a rpm of 5411 and a HZ reading of 2016. now this equates to 317.43 in the load area. I have gone through the entire 3rd gear pull and this is the higest load I hit.
Now my real question is what is the higest load cell I can put in? I have been running on a 300 load scaling for some time but never thought I would be above that. Would it be safe to try and take out the 70% load since its basically the same as my 60% and at the end put in 320?
Now on my most recent log (about 20 minutes ago) I have noticed that at 7047 rpms I am pulling in 2450hz of air. Now if we calculate all of this out using the formula I am in the load area of 296.21. Ok that seems pretty normal.
Now going down in the lower rpms right after full boost I get a rpm of 5411 and a HZ reading of 2016. now this equates to 317.43 in the load area. I have gone through the entire 3rd gear pull and this is the higest load I hit.
Now my real question is what is the higest load cell I can put in? I have been running on a 300 load scaling for some time but never thought I would be above that. Would it be safe to try and take out the 70% load since its basically the same as my 60% and at the end put in 320?
Last edited by dryad001; Jul 6, 2006 at 01:13 PM.
Jul 6, 2006, 01:13 PM
#33
Originally Posted by dryad001
Alright I have just started using this formula that l2r99gst devised and have a few questions.
Now on my most recent log (about 20 minutes ago) I have noticed that at 7047 rpms I am pulling in 2450hz of air. Now if we calculate all of this out using the formula I am in the load area of 296.21. Ok that seems pretty normal.
Now going down in the lower rpms right after full boost I get a rpm of 5411 and a HZ reading of 2016. now this equates to 317.43 in the load area. I have gone through the entire 3rd gear pull and this is the higest load I hit.
Now my real question is what is the higest load cell I can put in? I have been running on a 300 load scaling for some time but never thought I would be above that. Would it be safe to try and take out the 70% load since its basically the same as my 60% and at the end put in 320?
Now on my most recent log (about 20 minutes ago) I have noticed that at 7047 rpms I am pulling in 2450hz of air. Now if we calculate all of this out using the formula I am in the load area of 296.21. Ok that seems pretty normal.
Now going down in the lower rpms right after full boost I get a rpm of 5411 and a HZ reading of 2016. now this equates to 317.43 in the load area. I have gone through the entire 3rd gear pull and this is the higest load I hit.
Now my real question is what is the higest load cell I can put in? I have been running on a 300 load scaling for some time but never thought I would be above that. Would it be safe to try and take out the 70% load since its basically the same as my 60% and at the end put in 320?
If so, I wouldn't see why you couldn't scale higher than 300, like you have suggested.
Eric
Jul 6, 2006, 01:27 PM
#35
To add on to what i think may be right I just re-scaled my map to peak at 320. But when looking over everything I think if your load goes off the chart like mine just did the timing will start to head to 0 degrees of timing and the fuel will get much leaner. Im not sure if this is true or correct it's just an observation I had.
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