G/CYL question
G/CYL question SO, I am logging data and fine tuning my 69 nova,5.3L L33, PTE7675 turbo, 80LB injectors, 58 BASE psi, boost ref FPR, P01 ECM. Sorted out my fuel PSI drop and volt drop. At 15 PSI now and wanting to stay there since I am only 2 bar at the moment. Will switch to a P59 this winter to go to 20+PSI but want to hit the track and see if this combo will go 9's
Right now, I am trying to get the timing table dialed in but not sure what cells in that table are being selected for boost levels vs RPM vs, IAT, etc. The timing table of course has g/cyl & RPM on the axis. Is there a way I can log this to show which cells are being used for timing compared to my VE table or AFR error table? I am keeping my lower cells in the timing table at 10 degrees and want to start ramping up to get to 14 degrees at full tilt but don't want to keep guessing at my timing tables as to which cells are getting selected.
thank you
Right now, I am trying to get the timing table dialed in but not sure what cells in that table are being selected for boost levels vs RPM vs, IAT, etc. The timing table of course has g/cyl & RPM on the axis. Is there a way I can log this to show which cells are being used for timing compared to my VE table or AFR error table? I am keeping my lower cells in the timing table at 10 degrees and want to start ramping up to get to 14 degrees at full tilt but don't want to keep guessing at my timing tables as to which cells are getting selected.
thank you
I have added dyn cyl air to my channels. How do I use that and dyn air and dyn cyl air to determine the cells the ECM is picking from for the timing?
do I use DCA (dynamic cylinder air) after I have added to my channels to make a graph? I am in the process of doing that but wondering what axis I should use?
do I use DCA (dynamic cylinder air) after I have added to my channels to make a graph? I am in the process of doing that but wondering what axis I should use?
You look at a given point in the log and see what the dyn cyl air is and the corresponding RPM, for example .80 g/cyl at 4800 rpms. Now go to the spark table and look at the closest g/cyl and RPM and that cell is what the commanded base spark is, without factoring in all the IAT/ECT adders/subtractors etc.
If you haven't scaled the tune you are more than likely maxing out the table very quickly once in boost. Mine maxed out the table at about 5psi which left me very little to work with for timing control, I scaled the tune 50% and now have a usable table instead of the last row.
OK, I will log dyn cyl air and then correlate that based on RPM. That will then get compared to my spark table.
What will the graph for dyn cyl air look like by chance? Any examples?
As far as scaling, I have started a new tune file that will be 50% scaled. Seems simple enough to do....just more data logging. Still want to know exactly where my timing is at and what my grams/cyl comes out to.
What will the graph for dyn cyl air look like by chance? Any examples?
As far as scaling, I have started a new tune file that will be 50% scaled. Seems simple enough to do....just more data logging. Still want to know exactly where my timing is at and what my grams/cyl comes out to.
OK, I will log dyn cyl air and then correlate that based on RPM. That will then get compared to my spark table.
What will the graph for dyn cyl air look like by chance? Any examples?
As far as scaling, I have started a new tune file that will be 50% scaled. Seems simple enough to do....just more data logging. Still want to know exactly where my timing is at and what my grams/cyl comes out to.
What will the graph for dyn cyl air look like by chance? Any examples?
As far as scaling, I have started a new tune file that will be 50% scaled. Seems simple enough to do....just more data logging. Still want to know exactly where my timing is at and what my grams/cyl comes out to.
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good to go! thank you for the help. got the new data showing up, know EXACTLY where the timing is. Gosh, that can turn into RUSSIAN ROULET really fast if you are unaware where the timing is getting pulled.
Started to drizzle in a few degrees here and there. Car is showing 80 lbs/min of air tonight, so that is roughly 800 crank HP! Off the map at this point so might be done with HP gains until I go 3 bar.
again, thank you for the help.
Started to drizzle in a few degrees here and there. Car is showing 80 lbs/min of air tonight, so that is roughly 800 crank HP! Off the map at this point so might be done with HP gains until I go 3 bar.
again, thank you for the help.
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Verdad Gallardo Cool glad to see it worked out. Just be aware ,from experience when you skew a tune 50%, I think the lb/min of air can be a little misleading. I.e. high. I'm sure it's still making plenty of power and now you know the timing too 
If you haven't scaled the tune you are more than likely maxing out the table very quickly once in boost. Mine maxed out the table at about 5psi which left me very little to work with for timing control, I scaled the tune 50% and now have a usable table instead of the last row.
But I like only have the last row!
Also, just for reference, I am at about 1.16 g/cyl now at 6000 RPM and 205KPA. So I am back in control of the timing and dial the tune in with confidence. Will end up hitting the end of the table too like most but at lease I can run just over bar and still have timing numbers to play with.
The P59 will then get me over the 1,000 WHP goal...but that will take ID1300's, a new T56 and the whole winter to get this combo ready for spring.
Thanks again for the help
I was not stating that 50% scaled tuned wouldn't halve the airflow in the log, I was just saying that when you scale a tune, correlating the recorded airflow to HP is not exactly perfect any longer, i.e. usually its not just lb/min*10=fwhp.