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LM Wideband & AC Pressure Sensor

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Old Apr 24, 2004 | 01:29 PM
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Default LM Wideband & AC Pressure Sensor
If I hook the output of the LM up to the AC Pressure Sensor, how will I know what voltage corresponds to which AFR?
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Old Apr 24, 2004 | 04:33 PM
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Originally Posted by bomax
If I hook the output of the LM up to the AC Pressure Sensor, how will I know what voltage corresponds to which AFR?
The LM1 outputs 1.00V=AFR of 10.0 and 2.00V=AFR of 20, so for example 1.47V will actually be an AFR of 14.7. But you can write a PID in EFI Live that will actually multiply by 10 so it will actually read 14.7. You will most likely have to add or or subtract some voltage in the EFI Live PID to get the reading exact.
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Old Apr 24, 2004 | 04:45 PM
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And by using this method, I don't need to purchase the RPM hookup, because EFI Live can read that anyhow. Right?
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Old Apr 24, 2004 | 06:56 PM
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Originally Posted by bomax
And by using this method, I don't need to purchase the RPM hookup, because EFI Live can read that anyhow. Right?
That is correct!!! Just make sure your EFI Live reading with the correction factor is the same as the LM1 reading.
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Old Apr 24, 2004 | 08:06 PM
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Sounds very nice... so as I understand it, The O2 sensor will go in my I pipe and then through the floorboard into the cabin, where it plugs into the handheld unit. I will need to run a wire from the handheld unit (which will be in the cabin) and through the firewall up into the AC Pressure sensor. Is that correct? Also, were you able to find a plug to snap on the AC pressure sensor or did you just tap into the wires?

I will be moving the setup from vehicle to vehicle often and this is why I'm wondering
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Old Apr 25, 2004 | 02:21 AM
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Originally Posted by bomax
Sounds very nice... so as I understand it, The O2 sensor will go in my I pipe and then through the floorboard into the cabin, where it plugs into the handheld unit. I will need to run a wire from the handheld unit (which will be in the cabin) and through the firewall up into the AC Pressure sensor. Is that correct? Also, were you able to find a plug to snap on the AC pressure sensor or did you just tap into the wires?

I will be moving the setup from vehicle to vehicle often and this is why I'm wondering
So you have to have EFI Live?
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Old Apr 25, 2004 | 07:19 AM
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Originally Posted by WstSidHomE
So you have to have EFI Live?
YES you have to have EFI Live to write the PIDS,
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Old Apr 25, 2004 | 10:53 AM
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Originally Posted by ws6rufus
YES you have to have EFI Live to write the PIDS,
Is EFI Live vin locked like LS1edit is? Or is it not, like Autotap?
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Old Apr 25, 2004 | 11:37 AM
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Nope, it's not VIN locked.
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