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Old 03-11-2011, 01:34 AM   #11
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Just work from memory then. If you know you accelerated but didn't go WOT then the lean parts are certainly you letting off the throttle.


Probably best to start simple though. Let the car idle and log that. Don't step on the throttle once. Log about a minute or so and look at what it shows. Basically any closed loop log should look similar if the car is running well. Anything that goes rich will be WOT or damn close and leaner will be letting off the throttle. If you have a good baseline everything else will fall into place.
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Old 03-11-2011, 01:45 AM   #12
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Quote:
Originally Posted by iminhell View Post
Just work from memory then. If you know you accelerated but didn't go WOT then the lean parts are certainly you letting off the throttle.


Probably best to start simple though. Let the car idle and log that. Don't step on the throttle once. Log about a minute or so and look at what it shows. Basically any closed loop log should look similar if the car is running well. Anything that goes rich will be WOT or damn close and leaner will be letting off the throttle. If you have a good baseline everything else will fall into place.
What is closed loop?
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Old 03-11-2011, 02:13 AM   #13
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Closed loop is anything not Wide Open Throttle. That is, the ECU used feedback from the O2 sensor to control fuel trims and shoots for a Stoichiometric AFR, 14.68 for Gasoline.
If you look at your graph that's how I can tell you where closed loop, most of the graph is centered around Stoich.

Open loop does not use the O2 sensor. It used a different loop up table in the ECU that is based on MAF Counts (voltage) only. That table says the X counts equals Y amount of fuel and it doesn't shoot for any AFR. So at WOT if you are lean you have to adjust either tha amount of fuel or the MAF counts to get you to the AFR you want to see, it isn't automatic like closed loop is.
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Old 03-13-2011, 03:36 PM   #14
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I would need a dyno to do that right? I think before i try WOT ill wait to get the SCT unit so i can record more data. Im not even sure if i can get to WOT with the way my car is setup. Ill have to wait for the SCT thing to know though what i have right now doesnt have enough sensors and stuff to measure anything.

Its just a basic AFR gauge that i can log with. Its kinda fun for now though
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