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Nitrous
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- Dec 31, 2006
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IMO, any forced air inducted R3 should be running an upgraded MAP sensor.
I'm sure most (if not all) operators of FA R3s have noticed the "niggles" or "burps" in their engine when operating the throttle through the RPM range. Some kit makers have recommended disconnecting the MAP sensor to smooth out these throttle response problems. This is akin to chopping off your hand because you sprained your wrist.
The ECU uses the manifold absolute pressure (MAP) sensor to determine the absolute pressure (not the relative to atmospheric pressure) of the air inside the intake manifold and the atmosphere (barometric pressure). This information is used to determine the density of the air entering the combustion chamber in conjunction with the IAT (Intake Air Temperature) sensor, which is used to calculate the proper air/fuel mixture for the engine. This is especially important at WOT since the system is not in closed-loop at this time.
The MAP consists a silicon wafer that is thinner in the center (0.001") than around the edges (0.045"), which causes it to act as a diaphragm. The wafer is mounted with a perfect vacuum beneath the chip so that the air pressure from the other side flexes the chip. This flexing causes a change in resistance and the circuitry inside the sensor converts this to a voltage ranging from 0.02V to 4.94V when the output is pulled up towards 5V by the ECU.
1 Bar MAP Sensors are used on NA(naturally aspirated) vehicles.
2 Bar MAP Sensors are used on forced induction vehicles (Turbo & Supercharged). They can measure up to 2x the atmospheric pressure (29.4psi), so that means it can measure up to 14.7psi boost (the atmosphere is 14.7psi + 14.7psi from the turbo/supercharger).
3 Bar MAP Sensors can measure up to 44.1psi, which translates to 29.7psi boost from a Turbo/supercharger.
They all share a common pin-out, although the connector keying may be different:
Pin A -- Ground
Pin B -- Sensor output
Pin C -- +5 volts
Using a correctly rated MAP sensor for your boost application will remove the throttle burps from your FA R3. Additionally, IMO the upgraded MAP sensors are of a higher quality than the stock Triumph sensor... always a plus.
For FA R3s, upgrading the MAP sensor is as important as using larger injectors and a higher volume fuel pump. Not paying attention to these mods when going to FA induction on your R3 will result in not only a loss of power, but possibly a melted piston when running WOT for extended periods.
As discussed in another thread, good digital EGT and Wide-Band AF readouts are also recommended.
I'm sure most (if not all) operators of FA R3s have noticed the "niggles" or "burps" in their engine when operating the throttle through the RPM range. Some kit makers have recommended disconnecting the MAP sensor to smooth out these throttle response problems. This is akin to chopping off your hand because you sprained your wrist.
The ECU uses the manifold absolute pressure (MAP) sensor to determine the absolute pressure (not the relative to atmospheric pressure) of the air inside the intake manifold and the atmosphere (barometric pressure). This information is used to determine the density of the air entering the combustion chamber in conjunction with the IAT (Intake Air Temperature) sensor, which is used to calculate the proper air/fuel mixture for the engine. This is especially important at WOT since the system is not in closed-loop at this time.
The MAP consists a silicon wafer that is thinner in the center (0.001") than around the edges (0.045"), which causes it to act as a diaphragm. The wafer is mounted with a perfect vacuum beneath the chip so that the air pressure from the other side flexes the chip. This flexing causes a change in resistance and the circuitry inside the sensor converts this to a voltage ranging from 0.02V to 4.94V when the output is pulled up towards 5V by the ECU.
1 Bar MAP Sensors are used on NA(naturally aspirated) vehicles.
2 Bar MAP Sensors are used on forced induction vehicles (Turbo & Supercharged). They can measure up to 2x the atmospheric pressure (29.4psi), so that means it can measure up to 14.7psi boost (the atmosphere is 14.7psi + 14.7psi from the turbo/supercharger).
3 Bar MAP Sensors can measure up to 44.1psi, which translates to 29.7psi boost from a Turbo/supercharger.
They all share a common pin-out, although the connector keying may be different:
Pin A -- Ground
Pin B -- Sensor output
Pin C -- +5 volts
Using a correctly rated MAP sensor for your boost application will remove the throttle burps from your FA R3. Additionally, IMO the upgraded MAP sensors are of a higher quality than the stock Triumph sensor... always a plus.
For FA R3s, upgrading the MAP sensor is as important as using larger injectors and a higher volume fuel pump. Not paying attention to these mods when going to FA induction on your R3 will result in not only a loss of power, but possibly a melted piston when running WOT for extended periods.
As discussed in another thread, good digital EGT and Wide-Band AF readouts are also recommended.
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