hhojoe
07-09-2008, 08:35 PM
Evening all, been trying to get a handle on controlling the car's computer and all it has been doing is frustrating me.
A little background...
The car is a 2006 Subaru Baja Turbo. My generator can be seen at youtube if you search for "hhojoe". This weekend I switched to NaOH and production is up to about 800ml at 18 amps. Not the greatest but for what I have to work with (space limitation) I'm pleased for now. The HHO gas is connected to my air intake tube after the IAT and MAF sensors and as close to the turbo as I can get.
Now the PITA... First I tried no sensor manipulation, after resetting the PCM my mileage was great until the PCM 'learned' then mileage went into the toilet. Reset the PCM, mileage goes up for about 20 miles then bam, down again (monitored via a laptop).
Next I tried a MAP sensor adjuster to reduce the voltage the PCM sees and with the voltage down to about 2 volts my mileage is back to stock, for a while. Then I tried a MAF sensor reducer. This has much more of an effect on the engine where if i turn it too far I can stall the engine. Impressive, but mileage gains are practically still at zero.
Using a program on my PC and an odb-2 cable I am able to log data from many different sensors and it seems that my manual sensor adjusters have an effect but inevitibly the PCM ends up compensating in some way. Right no I have both the MAF and MAP adjusters in place. Next thing I am going to try is attacking the O2 sensor but of course its not a regular O2 sensor, that would be too easy, the forward sensor is an Air/Fuel Ratio sensor.
I've considered purchasing the proper odb-2 cable (already have the software) and redoing the mappings but the drawback there is, what about when the generator isn't running?
If you would like to see any logs, graphs or are curious about anything else such as the build of the MAP or MAF adjuster I can certainly fill you in. At this point I am very open to suggestions on how to handle the PCM.
A little background...
The car is a 2006 Subaru Baja Turbo. My generator can be seen at youtube if you search for "hhojoe". This weekend I switched to NaOH and production is up to about 800ml at 18 amps. Not the greatest but for what I have to work with (space limitation) I'm pleased for now. The HHO gas is connected to my air intake tube after the IAT and MAF sensors and as close to the turbo as I can get.
Now the PITA... First I tried no sensor manipulation, after resetting the PCM my mileage was great until the PCM 'learned' then mileage went into the toilet. Reset the PCM, mileage goes up for about 20 miles then bam, down again (monitored via a laptop).
Next I tried a MAP sensor adjuster to reduce the voltage the PCM sees and with the voltage down to about 2 volts my mileage is back to stock, for a while. Then I tried a MAF sensor reducer. This has much more of an effect on the engine where if i turn it too far I can stall the engine. Impressive, but mileage gains are practically still at zero.
Using a program on my PC and an odb-2 cable I am able to log data from many different sensors and it seems that my manual sensor adjusters have an effect but inevitibly the PCM ends up compensating in some way. Right no I have both the MAF and MAP adjusters in place. Next thing I am going to try is attacking the O2 sensor but of course its not a regular O2 sensor, that would be too easy, the forward sensor is an Air/Fuel Ratio sensor.
I've considered purchasing the proper odb-2 cable (already have the software) and redoing the mappings but the drawback there is, what about when the generator isn't running?
If you would like to see any logs, graphs or are curious about anything else such as the build of the MAP or MAF adjuster I can certainly fill you in. At this point I am very open to suggestions on how to handle the PCM.