Re: FORD LIGHTNING 90mm MAF - part number????
Posted: Sun Oct 21, 2012 3:46 pm
I'll post an update here... based on where this VQ map came from
- VQ map for the JWT Lightning MAF was used in the JWT 600hp application for the Z31 ECU
- Lightning MAF itself was not modified
- Z31 ECU hardware as configured to use a "less than unity" gain MAF input to the Z31 box. There was a 0.480 volt offset for the MAF scaler which was adjusted in the VQ table (shifting table left about 6 places)
- Lower end fail safe in Z31 ECU code was lowered to the minimum 0.080 volt offset
- VQ scale will just not work in the current form to get the air metering to run the higher Hp figures
For later model vehicles without the voltage offset...
- Install a less then unity gain op amp circuit.
- Offset the idle voltage lower by .480 volts from the MAF. This will effectively move the VQ starting point scale at idle to the left by about 6 places on the table.
- Change the fail safe bit to .040 volts. The ford sensor reads .080 volts when you turn the power on the sensor
Requires change to the ECU code to drop the minimum limp voltage (SR20s not necessary since there is a low AFM volt param, but other ECUs like Z32 etc will need a ECU code change). Also requires this circuit to perform the voltage drop
- VQ map for the JWT Lightning MAF was used in the JWT 600hp application for the Z31 ECU
- Lightning MAF itself was not modified
- Z31 ECU hardware as configured to use a "less than unity" gain MAF input to the Z31 box. There was a 0.480 volt offset for the MAF scaler which was adjusted in the VQ table (shifting table left about 6 places)
- Lower end fail safe in Z31 ECU code was lowered to the minimum 0.080 volt offset
- VQ scale will just not work in the current form to get the air metering to run the higher Hp figures
For later model vehicles without the voltage offset...
- Install a less then unity gain op amp circuit.
- Offset the idle voltage lower by .480 volts from the MAF. This will effectively move the VQ starting point scale at idle to the left by about 6 places on the table.
- Change the fail safe bit to .040 volts. The ford sensor reads .080 volts when you turn the power on the sensor
Requires change to the ECU code to drop the minimum limp voltage (SR20s not necessary since there is a low AFM volt param, but other ECUs like Z32 etc will need a ECU code change). Also requires this circuit to perform the voltage drop