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Old 01-25-2004, 01:34 PM   #1
Rickyh
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Default How can I monitor idcs

Is there anyway to monitor injector duty cycles without a utec?
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Old 01-25-2004, 02:13 PM   #2
MustGoFast
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yeah I believe many OBD2 scanners can monitor this as well. I know mine can.
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Old 01-25-2004, 06:03 PM   #3
Jon [in CT]
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Quote:
Originally posted by MustGoFast
yeah I believe many OBD2 scanners can monitor this as well. I know mine can.
There aren't any OBD2 scan tools that can monitor a WRX's injector duty cycle. The only standalone solution for logging injector duty cycles is DeltaDash from www.ecutek.com.
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Old 02-05-2004, 11:25 AM   #4
MustGoFast
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exscuse me? The scan tool I bought reads the IDC from the ECU... I have to look and see what it is but it's not deltadash.. that is just one example of a scan tool... Mine does not have nearly that resolution though so would not be as useful for tuning but cost a heck of a lot less.
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Old 02-05-2004, 03:07 PM   #5
mbiker97
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The SEC PSI^3 unit shows injector pulse width which is just one calculation away from IDC.
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Old 02-05-2004, 04:17 PM   #6
Jon [in CT]
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Quote:
Originally posted by MustGoFast
exscuse me? The scan tool I bought reads the IDC from the ECU... I have to look and see what it is but it's not deltadash.. that is just one example of a scan tool... Mine does not have nearly that resolution though so would not be as useful for tuning but cost a heck of a lot less.
Please do "look and see what it is." The WRX ECU doesn't report IDC to even a Subaru Select Monitor (the dealer's tool) or to DeltaDash. DeltaDash, however, can compute IDC from other data reported by the ECU when interrogating it using Subaru's proprietary (non-OBD2-compliant) communications protocol. If a scan tool relies solely on OBD-2 communciations protocols to interrogate the WRX ECU, it cannot report IDC.
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Old 02-06-2004, 01:47 AM   #7
jlevy
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Default alternate method

On a somewhat related note, you can monitor MAF values with some OBD-2 scan tools (I use a pocketlogger). Assume values for safe AFR, fuel density, injector size, and desired max IDC and you can easily come up with a maximum safe lb/min air flow target. Off the top of my head, I'd say it's somewhere around 26-28 lb/min for stock injectors.

...and no, my pocketlogger does not give any injector data.

-my 0.02

edited to add injector size to list of assumed values.

Last edited by jlevy; 02-06-2004 at 02:09 AM.
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