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Modern efi 4 strokes, maf or map?

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What do the modern efi 4 strokes use, map or maf? Do they all run tps?

Ive only owned old 2 strokes so I havnt gotten to dig into any efi 4 strokes. Thanks!

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Is that common to all makes/models?

This question may be bike specific, but is the vac line usually accesible without removing any plastic or are the ecus tucked away under the tank or somewhere out of easy reach??

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All 'competitive' off-road and mx bikes currently use one version or another of the Keihin Throttle body, which has three sensors: temp, MAP, and TPS

There is no vacuum line, because it is an in stream sensor, not a manifold pressure sensor.

KTM

Honda

Suzuki

Yamaha

Husqvarna

Kawasaki all use the same set up, more or less, with vastly different applications of the ECU programming, different FI nozzles, nozzle positions, and quality of sensors.

There is no adjusting any of the sensors as they are fixed (the TPS just gets calibrated)

There are several companies 'modding' the throttle body sensors to fool the ECU that the motor needs more advance and more fuel, thus tricking the Ecu in increase performance.

Several others have 'piggyback' modules the interupt sensor data going to the ECU, to also alter the ECU's output (Bazzaz, Dynatek, etc)

Most ECU's are 'locked' or 'restricted' from complete manipulation by the owner, without purchase of a software program and interface (Honda, KTM,  Yamaha). 

Others have limited access period, and have limited tuning capaicity (Kawi, Suzuki).

S

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I dont know what these guys are talking about, but the MAP is a Manifold Pressure sensor, it has nothing to do with mass flow, and they all have a vacuum line running to them, or be somehow directly mounted to a vacuum source.

And there are 4 sensors, not only 3: Coolant temp, air inlet temp, TPS and MAP.

All 'competitive' off-road and mx bikes currently use one version or another of the Keihin Throttle body, which has three sensors: temp, MAP, and TPS.

There is no vacuum line, because it is an in stream sensor, not a manifold pressure sensor.

KTM

Honda

Suzuki

Yamaha

Husqvarna

Kawasaki all use the same set up, more or less, with vastly different applications of the ECU programming, different FI nozzles, nozzle positions, and quality of sensors.

There is no adjusting any of the sensors as they are fixed (the TPS just gets calibrated)

There are several companies 'modding' the throttle body sensors to fool the ECU that the motor needs more advance and more fuel, thus tricking the Ecu in increase performance.

Several others have 'piggyback' modules the interupt sensor data going to the ECU, to also alter the ECU's output (Bazzaz, Dynatek, etc)

Most ECU's are 'locked' or 'restricted' from complete manipulation by the owner, without purchase of a software program and interface (Honda, KTM, Yamaha).

Others have limited access period, and have limited tuning capaicity (Kawi, Suzuki).

S

Mass air pressure

Throttle Position Sensor

Edited by Eddie8v

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