STFT's still active in open loop?
06-18-2005, 10:59 PM
#1
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STFT's still active in open loop? I was preparing a logging run using widebands with the commanded AFR / actual AFR method. I did the following to prepare as has been recommended:
Disable LTFT's
Raise DFCO speed to 255 to disable
Raise closed loop temp to 255 to disable
Car is already in speed density mode.
I noticed that during the logging run, STFT's are still active. Are they still affecting A/F in open loop, or just innocently flipping numbers. If they're still affecting the mixture, is there a way to shut them off altogether? Perhaps I missed something simple.
Thanks
Disable LTFT's
Raise DFCO speed to 255 to disable
Raise closed loop temp to 255 to disable
Car is already in speed density mode.
I noticed that during the logging run, STFT's are still active. Are they still affecting A/F in open loop, or just innocently flipping numbers. If they're still affecting the mixture, is there a way to shut them off altogether? Perhaps I missed something simple.
Thanks
06-21-2005, 12:53 PM
#5
Originally Posted by mistermike
I was preparing a logging run using widebands with the commanded AFR / actual AFR method. I did the following to prepare as has been recommended:
Disable LTFT's
Raise DFCO speed to 255 to disable
Raise closed loop temp to 255 to disable
Car is already in speed density mode.
I noticed that during the logging run, STFT's are still active. Are they still affecting A/F in open loop, or just innocently flipping numbers. If they're still affecting the mixture, is there a way to shut them off altogether? Perhaps I missed something simple.
Thanks
Disable LTFT's
Raise DFCO speed to 255 to disable
Raise closed loop temp to 255 to disable
Car is already in speed density mode.
I noticed that during the logging run, STFT's are still active. Are they still affecting A/F in open loop, or just innocently flipping numbers. If they're still affecting the mixture, is there a way to shut them off altogether? Perhaps I missed something simple.
Thanks
You should not be getting any fuel triming in open loop, as the PCM doesn't use O2 sensor feedback when in this mode.
06-21-2005, 05:44 PM
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Thanks everyone for the response. I'll try to answer everyone's questions is one gulp.
Yes. I'm running a custom OS that keeps both spark maps in SD mode. All of the appropriate MIL's have been disabled. I put it in open loop by raising the enable temp all the way, but the STFT's persist. There are plenty of other STFT related parameters under the O2 section, but I'm not familiar with what their effect is, so I'll wait for more detailed advice and/or smarten up a bit. I'll definitely check out the thread over at HPT and report back.
Yes. I'm running a custom OS that keeps both spark maps in SD mode. All of the appropriate MIL's have been disabled. I put it in open loop by raising the enable temp all the way, but the STFT's persist. There are plenty of other STFT related parameters under the O2 section, but I'm not familiar with what their effect is, so I'll wait for more detailed advice and/or smarten up a bit. I'll definitely check out the thread over at HPT and report back.
