re: MAP sensor resolution
There is no significant disadvantage using a 4 bar MAP sensor over any other MAP sensor with regards to resolution.
All MAP sensors produce an analog output with a range of 0V - 5V, with an infinite number of possible voltages in between, so the MAP itself has no bearing on the resolution as read by the ECU. The quantization effect of the ECU AD converter determines the resolution ? this is approximately 0.8 mbar for a stock MAP sensor, 1.5 mbar for a 3 bar MAP sensor and 2.0 mbar for the 4 bar MAP sensor.
The 4 bar MAP sensor gives a worst case resolution of approximately 1% at minimum load, 0.4% at normal driving manifold pressures and 0.2% at atmospheric pressure. While this is less resolution than the stock MAP sensor, the ECU fuelling accuracy is likely to be within 0.05 air fuel ratio points from the tuned setting, and as such is within the resolution requirements for a MAP sensor.
Other factors such as pressure fluctuations from the intake manifold and electrical noise on the MAP sensor wiring produce approximately 2 mbar variation in the MAP sensor signal and produce a greater inaccuracy for the ECU than the MAP sensor resolution.
Hondata 4 Bar MAP sensor
Hondata 4 Bar MAP sensor
Hondata
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