AEM WB consitently lean on analog output
Posted: Mon Aug 17, 2015 3:36 pm
Hello,
First post here so I'll try not to be too annoying.
I'm working on tuning a new engine for my 2007 Mustang. I have an AEM wideband setup that is using a LSU4.2 sensor. I am tuning with HPTuners and have the 0-5V analog output from the gauge installed on one of the analog inputs of the tuning interface. The gauge display is somewhat erratic and difficult to watch so I've obviously been using logged data from the analog output for my air/fuel tuning.
The ECU is forced into open loop for WB tuning. If I tune to the WB and then re-enable closed loop, the ECU is consistently pulling between 10 and 20% fuel out at pretty much every MAF voltage and load step per the short term fuel trims. I've tried a couple different formulas in the analog input of the tuning interface, but have not been able to come up with a WB curve that remotely aligns with what the ECU tries to do in closed loop. Essentially, the ECU says rich and the WB says lean.
To date, I've tried configuring as voltage to AFR as well as voltage to lambda. The gauge reads 10:1 at 0V and 20:1 at 5V per the manual for reference. I've replaced the O2 sensor thinking maybe I had a bad sensor but no delta in output was noticed.
With that said, I have a couple questions:
1) Is the AEM controller just not a good controller?
2) Is there a way to calibrate the sensor and gauge? The manual says no calibration is required.
3) I'd like to try an aftermarket WB controller that just has a known analog output, are there any available that are "inexpensive" that will produce acceptable steady state output?
4) Could I have some kind of grounding or other electrical issue that hasn't been obvious to me yet?
I had the car remote tuned by someone else with the original engine so I can't comment on whether or not the analog data was accurate before the engine swap.
Thanks in advance for any advice.
CSR
First post here so I'll try not to be too annoying.
I'm working on tuning a new engine for my 2007 Mustang. I have an AEM wideband setup that is using a LSU4.2 sensor. I am tuning with HPTuners and have the 0-5V analog output from the gauge installed on one of the analog inputs of the tuning interface. The gauge display is somewhat erratic and difficult to watch so I've obviously been using logged data from the analog output for my air/fuel tuning.
The ECU is forced into open loop for WB tuning. If I tune to the WB and then re-enable closed loop, the ECU is consistently pulling between 10 and 20% fuel out at pretty much every MAF voltage and load step per the short term fuel trims. I've tried a couple different formulas in the analog input of the tuning interface, but have not been able to come up with a WB curve that remotely aligns with what the ECU tries to do in closed loop. Essentially, the ECU says rich and the WB says lean.
To date, I've tried configuring as voltage to AFR as well as voltage to lambda. The gauge reads 10:1 at 0V and 20:1 at 5V per the manual for reference. I've replaced the O2 sensor thinking maybe I had a bad sensor but no delta in output was noticed.
With that said, I have a couple questions:
1) Is the AEM controller just not a good controller?
2) Is there a way to calibrate the sensor and gauge? The manual says no calibration is required.
3) I'd like to try an aftermarket WB controller that just has a known analog output, are there any available that are "inexpensive" that will produce acceptable steady state output?
4) Could I have some kind of grounding or other electrical issue that hasn't been obvious to me yet?
I had the car remote tuned by someone else with the original engine so I can't comment on whether or not the analog data was accurate before the engine swap.
Thanks in advance for any advice.
CSR