mx594

iTrader: (4)

Actually I might be wrong about that linear equation part. The numbers might correspond to the map output at it's minimum and maximum voltage (0-5?), but the principle is the same- if you can apply at least two different steady pressures you should be able to use trial and error and eventually find the correct calibration pretty quickly.

Rated Z

Appendix A: TPS and MAP Calibration
TPS Calibration
1. To calibrate the TPS you need a UTEC and a PC.
2. Turn ON the ignition but do not start the car. With no pressure on the throttle pedal
record the TPS value (T0) under logger #4.
3. With the throttle pedal fully depressed record the TPS value (T1) under logger #4.
4. Min TPS = T0 / 51
5. Max TPS = T1 / 51
Note that these numbers are rounded off to one decimal place.
MAP Calibration
1. To calibrate the MAP sensor you need an accurate boost/vacuum gauge (note that 0 psi is
atmospheric pressure), a UTEC and a PC.
2. Turn ON the ignition but do not start the car. Record the pressure reading (P0) in psi on
the gauge and the MAP value (M0) under logger #4.
3. Start the car.
4. As an alternative measurement for P0. Place the engine under vacuum and record the
pressure reading (P0) in psi on the gauge and the MAP value (M0) under logger #4.
5. Place the engine under boost and record the pressure reading (P1) in psi on the gauge
and the MAP value (M1) under logger #4. Try to find a stable reading for this in boost.
6. Ideally the two measurement points should be as far apart as possible.
7. The gradient is calculated as follows;
Gradient = 1000 * (P1 – P0) / (M1 – M0)
Note that this number is rounded off to the nearest whole number.
8. The intercept is calculated as follows;
Intercept = ((Gradient * M0) - (1000 * P0)) / 100
Note that this number is rounded off to the nearest whole number.