Introduction

Fueling

Power

Intake Airflow Sensors

Any intake metering device should be within the intake track of the turbo (know as "draw thru" or "pull thru"). It is not recommended to place your intake metering device (VAM, MAF, HFM, etc) in the charge-pipe (known as "blow thru") unless it is a specifically designed piece of hardware that can properly read a pressurized system. This is because these systems are designed to meter airflow at atmospheric levels (corrected for air temperature in the ECU). Therefore, when pressures are different than atmospheric, reported airflow becomes drastically different than actual airflow. The below graph (fig. 1) illustrates this effect in terms of positive pressure.

fig. 1 - A comparison of reported airflow by a MAF under different positive pressures.

Manifold Air Pressure Sensors

MAP (Manifold Air Pressure) sensors can be added to most any Motronic ECU through a piggyback converter board (available here)

Alpha-N

Alpha-N is a tuning solution utilizing the TPS (throttle position sensor) and vehicle RPM. This is not a good tuning solution for turbocharged vehicles, and is also a poor solution, but to a lesser degree, for supercharged vehicles.