Choosing between MAP or TPS: Difference between revisions
(New page: ==MAP vs. TPS== The MJLJ offers two different mechanisms for measuring engine load. See the guide below for determining which is best for your engine. ===MAP Sensor=== A MAP sensor dete...) |
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The MAP sensor requires a stable source of manifold pressure across all cylinders. If you have multiple runners, like a multiple sidedraft configuration, you will need a balance tube with a miniature 'plenum', or accumulator, to smooth the pressure reading across all cylinders. | The MAP sensor requires a stable source of manifold pressure across all cylinders. If you have multiple runners, like a multiple sidedraft configuration, you will need a balance tube with a miniature 'plenum', or accumulator, to smooth the pressure reading across all cylinders. | ||
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[[Image:Adapting map sensor for multiple runners.png]] | |||
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===Throttle Position Sensor (TPS)=== | ===Throttle Position Sensor (TPS)=== | ||
A Throttle Position Sensor measures the angle of the throttle plate, which can be used to infer engine load. Use this configuration if you have very aggressive cams and a manifold pressure reading is unstable, especially at idle. The sensor will need to be adapted to the throttle linkage and then wired to the MJLJ. | A Throttle Position Sensor measures the angle of the throttle plate, which can be used to infer engine load. Use this configuration if you have very aggressive cams and a manifold pressure reading is unstable, especially at idle. The sensor will need to be adapted to the throttle linkage and then wired to the MJLJ. | ||
Revision as of 03:53, 1 April 2007
MAP vs. TPS
The MJLJ offers two different mechanisms for measuring engine load. See the guide below for determining which is best for your engine.
MAP Sensor
A MAP sensor determines engine load by measuring manifold pressure (or vacuum).
It is typically considered more accurate because it directly measures how the engine is 'breathing' and automatically adjusts for varying conditions (altitude, temperature, humidity) and modifications to the engine which affects it's volumetric efficiency.
The MAP sensor requires a stable source of manifold pressure across all cylinders. If you have multiple runners, like a multiple sidedraft configuration, you will need a balance tube with a miniature 'plenum', or accumulator, to smooth the pressure reading across all cylinders.
Throttle Position Sensor (TPS)
A Throttle Position Sensor measures the angle of the throttle plate, which can be used to infer engine load. Use this configuration if you have very aggressive cams and a manifold pressure reading is unstable, especially at idle. The sensor will need to be adapted to the throttle linkage and then wired to the MJLJ.
