Turbo system

[acrbill]

Originally Posted by DTM_Yaris

The maf sensor is able to output over 8 volts. Thats not the problem. The problem is the voltage the ecu sees!
If it sees over 2.8 volts at "x" rpm and throttle position it will go crazy. Trust me I have done it.
But I am working around this, meaning the stock ecu will never know that it is force fed.

If the MAF sensor is on the inlet side of the turbo Its not going to have compressed air going through it so the reading of the air going into the turbo will be accurate when your not in boost. Maybe once your in boost the turbo is sucking in more air there might be an issue, but all you would need would be a voltage clamp. Thats strange that it reads 8 volts. I would have assumed that it was 5v like a MAP sensor.

[DTM_Yaris]

Originally Posted by acrbill

If the MAF sensor is on the inlet side of the turbo Its not going to have compressed air going through it so the reading of the air going into the turbo will be accurate when your not in boost. Maybe once your in boost the turbo is sucking in more air there might be an issue, but all you would need would be a voltage clamp. Thats strange that it reads 8 volts. I would have assumed that it was 5v like a MAP sensor.

Whether the MAF is on the inducer or discharge side of the equation makes little difference for drivability. Closed loop operation was and is fine. My posts have been strictly about boost and open loop mode. The voltage clamp will not help when you are in boost either. The computer takes into account Airtemp, throttle position (or anticipated position for DBW), coolant temp, rpm and crank position.
It is not like the old days when we could just play the analog game. It has checks and balances in the algorithms.
It is very difficult to overcome.