Can Dashlogic display injector duty cycle?
04-20-2017, 10:45 AM
#1
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Can Dashlogic display injector duty cycle?
I see injector pulse width but I don't see duty cycle? Can you add a formula and if so does anyone have it. I am guessing it is injector pulse width divided by (120/rpm), right?
Thanks
Thanks
Last edited by Wilkinshc; 04-20-2017 at 07:06 PM.
04-20-2017, 11:02 PM
#2
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Can anyone tell how I would type a PID calculation expression to show: Injector Pulse Width divided by (120/RPM). Would this be right? (pid(1008) / (120 / pid(10)) )
Last edited by Wilkinshc; 04-20-2017 at 11:15 PM.
04-21-2017, 08:21 AM
#3
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St. Jude Donor '15
I'm not driving the corvette so I don't have dash logic with me, but yes, it can display anything you can pretty much come up with a formula on. Inj duty cycle is pretty basic.
I can look up the formula tonight if you still need it.
Try what you've got and see what it does. Not going to hurt anything.
I can look up the formula tonight if you still need it.
Try what you've got and see what it does. Not going to hurt anything.
04-21-2017, 10:51 AM
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St. Jude Donor '15
He clearly knows that, thus the reason he's asking for the formula.
There's no reason Dash Logic couldn't add it to the drop down list if they wanted to. Boost, for example, is calculated, and it's in the drop down list
There's no reason Dash Logic couldn't add it to the drop down list if they wanted to. Boost, for example, is calculated, and it's in the drop down list
04-21-2017, 12:54 PM
#7
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That formula didn't work. It gave me a number but it went to 100% at part throttle, so I must need to move or adjust something. I will keep working on it but it you have it would sure appreciate the help.
04-21-2017, 02:07 PM
#8
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St. Jude Donor '15
I have some alerts setup for it already so I've got it. I'll look it up tonight.
04-22-2017, 02:18 AM
#9
is there an extra space behind your parenthesis at the end? I didn't check the pid # but that expression looks right,
IPW/(120/RPM)
IPW/(120/RPM)
Last edited by SlowBusa08; 04-22-2017 at 02:34 AM.
04-22-2017, 11:57 AM
#10
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St. Jude Donor '15
Inj PW by default is in milliseconds and RPM is of course in revolutions per minute. The / 120 part is getting you to revolutions per second (x 2 since you have two revolutions on a 4 stroke to inject fuel), so it's still seconds vs. milliseconds IMO
I'm apparently not using inj duty cycle on mine. The alert I had set was for fuel pressure, not duty cycle, so I don't have the formula in front of me.
You're close, it's just a matter of moving some decimals around now it looks like.
I'm apparently not using inj duty cycle on mine. The alert I had set was for fuel pressure, not duty cycle, so I don't have the formula in front of me.
You're close, it's just a matter of moving some decimals around now it looks like.
Last edited by schpenxel; 04-22-2017 at 11:57 AM.
04-22-2017, 04:06 PM
#13
Instructor
(pid(10)*pid(1008)) /1200
(rpm*ms)/1200
Still need to double check by logging but I need to replace an idler pulley that's making alot of noise before I can drive it around.
DJ
(rpm*ms)/1200
Still need to double check by logging but I need to replace an idler pulley that's making alot of noise before I can drive it around.
DJ
04-22-2017, 09:42 PM
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St. Jude Donor '15
The divided by 1200 one should be right. Have to go from seconds to millisecond then x 100 since you want percent so that cancels out 2 of the 3 decimals
I'm going to try it on mine tomorrow also
I'm going to try it on mine tomorrow also
04-26-2017, 02:58 PM
#15
subd
04-26-2017, 06:08 PM
#17
Safety Car
04-27-2017, 01:28 PM
#18
Burning Brakes
FYI - I've tried just about every combo listed above and nata...
If anyone has any ideas, I'm listening. IDC would be great to see.
If anyone has any ideas, I'm listening. IDC would be great to see.
04-27-2017, 01:41 PM
#19
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St. Jude Donor '15
[injector PW in mins] x [RPM] / 2 * 100
This is the correct formula.
Inj PW will report in milliseconds though so you have to do that conversion (divide by 60000)
Try
pid(1008)/60000 * pid(10) / 2 * 100
That's assuming pid(1008) is inj PW and pid(10) is RPM which I'm not 100% sure of without checking
I'll play around with it when I get home if that doesn't work
This is the correct formula.
Inj PW will report in milliseconds though so you have to do that conversion (divide by 60000)
Try
pid(1008)/60000 * pid(10) / 2 * 100
That's assuming pid(1008) is inj PW and pid(10) is RPM which I'm not 100% sure of without checking
I'll play around with it when I get home if that doesn't work
Last edited by schpenxel; 04-27-2017 at 01:46 PM.
04-27-2017, 01:50 PM
#20
Burning Brakes
[injector PW in mins] x [RPM] / 2 * 100
This is the correct formula.
Inj PW will report in milliseconds though so you have to do that conversion (divide by 60000)
Try
pid(1008)/60000 * pid(10) / 2 * 100
That's assuming pid(1008) is inj PW and pid(10) is RPM which I'm not 100% sure of without checking
I'll play around with it when I get home if that doesn't work
This is the correct formula.
Inj PW will report in milliseconds though so you have to do that conversion (divide by 60000)
Try
pid(1008)/60000 * pid(10) / 2 * 100
That's assuming pid(1008) is inj PW and pid(10) is RPM which I'm not 100% sure of without checking
I'll play around with it when I get home if that doesn't work
But do you leave the spaces? Its still showing the formula ....
I must be lost.
