change for 10:1 to 11.5:1 using datalogs
#1
change for 10:1 to 11.5:1 using datalogs
At the moment I have no one to drive the car for me to datalog so I have a really rich map right now to go out and datalog.
I've always done live mapped and removed duty cycle on as the driver holds the revs.
I've got a datalog and I want to change the a/f ratio by upto 2 points in some places, how would i calcualte the difference in duty cycle % to add/remove on the map?
for exmaple i am at 2000 rpm , duty cycle 5.5%, a/f 12.36:1. I want 13.5:1. I have 1000cc injectors if it makes a difference.
at the moment I am sort of doing it be my instinct lol but I don't wanna upload it and then drive to find its meag rich or lean.
Thanks
I've always done live mapped and removed duty cycle on as the driver holds the revs.
I've got a datalog and I want to change the a/f ratio by upto 2 points in some places, how would i calcualte the difference in duty cycle % to add/remove on the map?
for exmaple i am at 2000 rpm , duty cycle 5.5%, a/f 12.36:1. I want 13.5:1. I have 1000cc injectors if it makes a difference.
at the moment I am sort of doing it be my instinct lol but I don't wanna upload it and then drive to find its meag rich or lean.
Thanks
#2
figured it out in the end.
say you get a value in the cell which is 14(%) (dutycycle) and has an a/f 12.5 and you want 14.5
you divide 12.5/14.5=0.86 so now multiply your cell value by this 14*0.86= 12.06. You may have to round up depending on software.
I'm sure a lot of you guys know this already but I'll put it up for the noobs like me lol.
say you get a value in the cell which is 14(%) (dutycycle) and has an a/f 12.5 and you want 14.5
you divide 12.5/14.5=0.86 so now multiply your cell value by this 14*0.86= 12.06. You may have to round up depending on software.
I'm sure a lot of you guys know this already but I'll put it up for the noobs like me lol.
#3
Holy crap thats a complicated way of tuning especially while driving, lol.
Rule of thumb is 1 AFR point =about 8%, so if your ar 12.5 and your target is 14 you would subtract 12% and it should get you close, just remember that the math isn't perfect because the ECU is actually interpolating the data from 4 different cells on the map at once and averaging them to find the correct pulse width.
Why are you watching duty cycle as a point of reference? using crome?
Rule of thumb is 1 AFR point =about 8%, so if your ar 12.5 and your target is 14 you would subtract 12% and it should get you close, just remember that the math isn't perfect because the ECU is actually interpolating the data from 4 different cells on the map at once and averaging them to find the correct pulse width.
Why are you watching duty cycle as a point of reference? using crome?
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05-06-2003 10:42 AM