Quote:
Originally Posted by steve99
Wont work mate, you would just be miss calibrating the maf and your fueling and load calculations will be will be wong. as you would be telling the ecu an incorrect mass of air entering the engine.
The maf is kind of measuring the velocity of the air passing the sensor. You know the size of the tube the sensor is in so you can calculate the volume\mass of air passing (offsets due to temperature and pressure done via map and iat sensors).
The maf scale table is the way the ecu calibrates the voltage provided by the maf sensor ( ie the velocity of air passing sensor) that produces the output volts is turned into a mass of air number in g\s. This table is only valid when using the correct maf sensor and the correct size maf tube.
So for a given velocity the maf sensor produces a cerian voltage, once the velocity hits a certian value and the sensor is maxed out ie reading 5volts thats it , no more flow can be read by the sensor..
You then need to change something
the size of the maf tube ie make it bigger so velocity is reduced and same sensor can be recalibrated for new tube size ie lower velocity of air past sensor now equates to a larger mas of air and hence less volts for same mas of air flowing past sensor.
or get a different maf sensor like the forester\wrx one thats plug compatable but is able to read about 30% higer flow rate for the 5v output, again you have to recalibrate for new sensor. But you wont need to alter your maf tube size. Assuming you only need 30% more flow
If you simply alter the g\s without changing anything your just going to get an incorrect mas of air reading.
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Thanks mate. So getting a bigger MAF tube and recalibrating again is the way to go I guess.
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Kodename47 yes Im on the stock MAP sensor.
My target is 0,7bar (~10psi) but SD is still not an option.
Thank you guys very much. Appriciate your help.
As you can see I hit my current boost target really late (WG on spring pressure) because I adjusted the WG actuator "for safeness" during tuning. The WG is not fully closed cause of less spring pressure (spring pressure is adjustible).