SpeedFactory 4 Bar MAP Sensor for 06-09 S2000/12-15 Civic Si

SpeedFactory 4 Bar MAP Sensor for S2000, Civic Si, ILX, TSX, and CR-Z

The factory MAP sensor on these cars was built for a naturally aspirated engine and stops reading not far past atmospheric pressure. Add a turbo and ask for real boost, and the stock sensor is blind above its ceiling, which leaves your tune guessing about what is actually happening in the manifold. This SpeedFactory 4 Bar MAP sensor reads accurately all the way up to around 43 psi on a true linear 0 to 5 volt scale, so your engine management sees real manifold pressure across a serious boost range and you can set a boost cut to protect the motor. For a high-boost build, that visibility and that safety net are exactly what you want.

This is the New Style K-series-connector version, so it uses the later Honda MAP sensor plug and drops into the 06-09 S2000, the 06-11 R18 Civic, the 12-15 Civic Si, the 2013 and up ILX, the 09-10 TSX, and the CR-Z. It is dimensionally identical to the stock sensor and plug-and-play, so it looks factory once installed and reads boost the stock sensor never could. SpeedFactory hand assembles and function-checks each one in the USA, and because the pressure-to-voltage scale is truly linear, you do not need to re-tune every time altitude changes the way you do with some sensors.

3 bar or 4 bar: which one you actually want

This is the call worth getting right, because it comes down to your boost target. A MAP sensor spreads its 0 to 5 volt output across its whole pressure range, so a sensor sized close to your actual boost gives you the finest tuning resolution. The 4 bar reads to about 43 psi, which makes it the right choice for a genuinely high-boost build. The tradeoff is that spreading the signal across that wider range gives you slightly coarser resolution down low than a 3 bar would. So if your build is targeting somewhere under roughly 20 psi, the 3 bar version is the better fit and gives cleaner low-boost resolution. If you are chasing big boost, or you know the build is going to grow into it, this 4 bar is the one to run. Match the sensor to where the build is actually headed.

Specs

Color options

Red and black are the exact same sensor. The color is the housing, nothing else, so there is no performance difference. Pick whichever you like.

What to know before you buy

The big one: this sensor does nothing on its own. It requires a programmable engine management system, something like Hondata, KTuner, or Neptune, and a tune calibrated for a 4 bar sensor. If you install this and do not tell your engine management it is now reading a 4 bar sensor, the car will run wrong, because the ECU will interpret the new voltage scale with the old calibration. SpeedFactory publishes the scalar and offset values so your tuner can plug them straight in. This is a tuning component, not a plug-in power part. If you are on a programmable setup and your tuner knows what to do with it, the install itself is genuinely plug and play.

Consider how high you are really going. This 4 bar reads to around 43 psi, which covers the vast majority of high-boost street and strip builds on these platforms. If