How do I make car run at 14.0AFR closed loop?
07-30-2006, 05:25 PM
#16
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Re: How do I make car run at 14.0AFR closed loop?
Originally Posted by turbo_Z
Sounds interesting.. never knew such a sensor existed and always thought the wideband needed a 5 volt power source.
08-07-2006, 10:16 PM
#17
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Re: How do I make car run at 14.0AFR closed loop?
Well I tried the resistor trick and it did not change the A/F ratio at all. Apparently the PCM measures the resistance in the O2 Sensor circuit and uses that as a baseline before it goes into closed loop.
08-08-2006, 07:07 AM
#18
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Re: How do I make car run at 14.0AFR closed loop?
Originally Posted by 97WS6Pilot
Well I tried the resistor trick and it did not change the A/F ratio at all. Apparently the PCM measures the resistance in the O2 Sensor circuit and uses that as a baseline before it goes into closed loop.
08-08-2006, 07:29 PM
#19
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Re: How do I make car run at 14.0AFR closed loop?
Originally Posted by Sweetred95ta
How can it measure the resistance, know that it is different, and compensate for it, all while still maintaining an a/f of 14.7:1? Especially running in open loop first.
I'm making an assumption based on how my car reacted. According to my calculations a .450 ohm resister should have made a significant change in reported A/F ratio. I'm using a dynojet wideband commander so I can read very small changes as small as .1 AFR. It didn't change the A/F ratio or long terms at all. I tried it on the signal and signal ground wires to no avail.
Last edited by 97WS6Pilot; 08-08-2006 at 07:35 PM.
08-08-2006, 07:48 PM
#20
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Re: How do I make car run at 14.0AFR closed loop?
So, you changed the Voltage seen by the O2 sensor. I'm wondering if the computer picks up the range (0 to ?) of the current and changes it's parameters accordingly. That's crazy. I'm glad you attempted to do it though.
Last edited by Sweetred95ta; 08-10-2006 at 09:15 AM.
08-09-2006, 12:11 AM
#21
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Re: How do I make car run at 14.0AFR closed loop?
Originally Posted by Sweetred95ta
So, you changed the current seen by the O2 sensor. I'm wondering if the computer picks up the range (0 to ?) of the current and changes it's parameters accordingly. That's crazy. I'm glad you attempted to do it though.
08-12-2006, 03:31 PM
#22
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Re: How do I make car run at 14.0AFR closed loop?
i never used the above mentioned program. but when you tune as much as some of us guys do you need a wideband o2 to make sure you are where you want to be (A/F ratio wise). and if you have a wide band you can do it with tuning, all you have to do is limit the range of blms 128 is 14.7, so limit the max blm to 120 and see where that gets you. if its still to lean set the max at 118, and check it again.
and dont forget about the short term blm.
someone tell me if my thinking is wrong here
and dont forget about the short term blm.
someone tell me if my thinking is wrong here
08-12-2006, 09:06 PM
#23
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Re: How do I make car run at 14.0AFR closed loop?
Originally Posted by 97Z-M6
i never used the above mentioned program. but when you tune as much as some of us guys do you need a wideband o2 to make sure you are where you want to be (A/F ratio wise). and if you have a wide band you can do it with tuning, all you have to do is limit the range of blms 128 is 14.7, so limit the max blm to 120 and see where that gets you. if its still to lean set the max at 118, and check it again.
and dont forget about the short term blm.
someone tell me if my thinking is wrong here
and dont forget about the short term blm.
someone tell me if my thinking is wrong here
Last edited by 97WS6Pilot; 08-12-2006 at 09:09 PM.
08-12-2006, 09:55 PM
#24
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Re: How do I make car run at 14.0AFR closed loop?
Maybe doublecheck how you had the resistor was hooked up - if it was just limiting current, it might not have changed the voltage at the pcm. The pcm input might have a high impedance to not load the small signal coming from the O2 sensor. You need it hooked up as a voltage divider. You could doublecheck your circuit by measuring the voltage drop across the resistor or measuring the voltage before the resistor to gnd and after the resistor to gnd. if it isn't dropping voltage, it's hooked up wrong.
08-14-2006, 11:26 AM
#25
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Re: How do I make car run at 14.0AFR closed loop?
Originally Posted by turbo_Z
Sounds interesting.. never knew such a sensor existed and always thought the wideband needed a 5 volt power source.
Here' s a link to the entire setup
http://www.innovatemotorsports.com/products/lm1.php
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