Description

STM Speed Density Sensor Kit GM AIT & 4 Bar MAP for Evo 8/9 & DSM

Firstly, Buy STM Speed Density Sensor Kit Evo 8 9 with GM AIT, Omni Power 4 Bar MAP. The STM Speed Density Sensor Kit GM AIT & 4 Bar MAP for Evo 8/9 & DSM is a complete sensor package designed for Mitsubishi Lancer Evolution VIII, Evolution IX and DSM vehicles being converted to speed density engine management. The kit combines a GM Air Intake Temperature (AIT) sensor, Omni Power 4 Bar MAP sensor, matching pigtail harness and aluminum weld bung into one convenient package. It is designed to provide the key sensor hardware needed for a speed density setup without sourcing each component separately.

The kit is specifically listed for 2003–2006 Mitsubishi Evolution VIII and IX, as well as selected DSM applications including the 1990–1999 Eclipse GST/GSX, 1990–1998 Talon TSi and 1990–1994 Laser RS.

STM Speed Density Sensor Kit for Evo 8/9

Speed density engine management uses manifold pressure and intake-air temperature information as key inputs for calculating engine airflow. On a modified 4G63T, this approach can be used as an alternative to relying on the factory mass airflow sensor for airflow measurement.

The STM Speed Density Sensor Kit provides two critical sensors for this type of conversion: a GM AIT sensor for measuring intake-air temperature and a 4 Bar Omni Power MAP sensor for measuring manifold pressure.

STM specifically markets this kit for customers switching their DSM or Evo 8/9 to Speed Density.

GM AIT Sensor and 4 Bar MAP Sensor

Firstly, the kit includes a GM AIT sensor, part number 25036751. This sensor is used to measure intake-air temperature and can be positioned in the charge-air system where the tuner wants to monitor the temperature entering the engine. The kit also includes the matching STM pigtail harness.

Secondly, the kit includes an Omni Power 4 Bar MAP sensor, part number MAP-MITS-4BR. A MAP sensor measures manifold absolute pressure and provides the ECU with pressure information required by a compatible speed density calibration.

Thirdly, STM includes an aluminum 3/8-inch NPT weld bung, providing a mounting solution for the GM AIT sensor in an appropriate intercooler or charge pipe.

Together, these components create a practical hardware package for a speed density conversion.

4 Bar Omni Power MAP Sensor

The included Omni Power 4 Bar MAP sensor is designed for higher-pressure engine-management applications where a factory MAP sensor may not provide the desired measurement range.

A 4 Bar MAP sensor is particularly relevant to modified turbocharged engines where boost levels exceed the range of a lower-pressure sensor. The sensor supplies the pressure signal required by compatible engine-management systems and tuning strategies.

The exact usable pressure range and calibration should be configured correctly in the ECU or aftermarket engine-management system. The sensor should never be installed without confirming that its calibration is supported by the ECU being used.

GM Air Intake Temperature Sensor

The included GM AIT sensor provides a dedicated intake-air-temperature measurement point.

When converting an Evo 8 or Evo 9 to speed density, an appropriate intake-air-temperature sensor location is important. AEM’s Evo 8 speed-density documentation similarly recommends positioning the IAT sensor downstream of the intercooler so that the measured temperature more accurately represents the charge air entering the engine.

The STM kit’s aluminum weld bung allows the GM sensor to be installed into suitable intercooler or charge piping.

Complete Hardware Package

The STM kit eliminates the need to source the major sensor components individually.

What’s Included

• 1 × STM Aluminum 3/8″ NPT Weld Bung
  • Part number: STM-FAB-3/8-ALFB
• 1 × Omni Power 4 Bar MAP Sensor
  • Part number: MAP-MITS-4BR
• 1 × GM AIT Sensor
  • Part number: 25036751
• 1 × STM Pigtail Harness
  • Part number: STM-HAR-AIT

This combination provides the primary sensor hardware needed for the conversion while keeping the installation components together in one package.

Evo 8 and Evo 9 Fitment

The STM Speed Density Sensor Kit is listed for:

• 2003 Mitsubishi Evolution VIII
• 2004 Mitsubishi Evolution VIII
• 2005 Mitsubishi Evolution VIII
• 2006 Mitsubishi Evolution IX

It is also listed for the following DSM applications:

• 1990–1999 Mitsubishi Eclipse GST/GSX
• 1990–1998 Eagle Talon TSi
• 1990–1994 Plymouth Laser RS

Always verify your specific ECU, engine-management system and sensor requirements before ordering.

Ideal for Modified 4G63T Builds

The STM kit is particularly useful for Evo 8 and Evo 9 owners building a performance-oriented 4G63T setup.

It can be used as part of projects involving:

• Speed density conversions
• Large turbocharger upgrades
• Custom intercooler piping
• Aftermarket engine management
• ECU tuning projects
• MAP-based airflow calculations
• Performance 4G63T builds
• Track and competition vehicles
• MAF-delete configurations

A speed density conversion is an engine-management modification, so the sensors must be correctly configured and calibrated within the ECU.

Installation Considerations

The aluminum weld bung is intended to provide a mounting location for the GM AIT sensor. Proper installation requires the bung to be securely welded into suitable charge or intercooler piping.

The MAP sensor must also be connected to an appropriate pressure source and wired according to the requirements of the ECU or engine-management system.

Sensor calibration is critical. Installing a sensor without configuring its correct scaling can result in incorrect pressure or temperature readings and improper engine operation.

For this reason, the complete speed density conversion should be installed and calibrated by someone familiar with the specific Evo 8/9 ECU and tuning platform.

Speed Density Conversion Hardware

The STM kit should be viewed as the sensor hardware portion of a speed density conversion rather than a complete ECU tuning package.

A compatible ECU or engine-management system, appropriate wiring, calibration and tuning are still required. STM also offers other Evo 8/9 speed-density components, including speed-density intake options and related engine-management hardware.

For example, a separate speed density harness can provide the necessary wiring interface between the sensors and the vehicle’s existing electrical system.

Benefits of the STM GM AIT & 4 Bar MAP Kit

The STM kit provides several practical advantages for Evo and DSM owners:

• Complete sensor package
• GM AIT temperature sensor
• Omni Power 4 Bar MAP sensor
• Matching AIT pigtail harness
• Aluminum weld bung included
• Designed for speed density conversions
• Suitable for Evo 8 and Evo 9
• Also supports selected DSM applications
• Convenient alternative to sourcing individual components
• Suitable for modified turbocharged engines

By combining the major sensor components into one package, the kit simplifies sourcing for a speed density conversion.

Frequently Asked Questions

What is the STM Speed Density Sensor Kit?
It is a sensor package containing a GM AIT sensor, Omni Power 4 Bar MAP sensor, AIT pigtail harness and aluminum weld bung for Evo 8/9 and selected DSM applications.

Does this kit fit Evo 8 and Evo 9?
Yes. STM lists the kit for 2003–2006 Mitsubishi Evolution VIII and IX.

What MAP sensor is included?
The kit includes an Omni Power 4 Bar MAP Sensor, MAP-MITS-4BR.

What AIT sensor is included?
The kit includes a GM AIT sensor, part number 25036751.

Does the kit include the wiring for the GM AIT sensor?
Yes. STM includes an STM Pigtail Harness, STM-HAR-AIT.

Does it include a bung for the AIT sensor?
Yes. The kit includes an STM aluminum 3/8-inch NPT weld bung.

Is this a complete speed density conversion?
It is a complete sensor kit, but not necessarily a complete vehicle conversion. Compatible ECU software, wiring, configuration and professional tuning may also be required.

Can it be used with a modified Evo 8/9?
Yes. The kit is specifically intended for speed density applications on Evo 8/9 and DSM vehicles.

Why use a 4 Bar MAP sensor?
A 4 Bar MAP sensor provides a higher pressure measurement range than lower-rated sensors, making it suitable for many higher-boost turbocharged applications when correctly calibrated.

Does the kit include a speed density harness?
The kit includes the STM AIT pigtail harness, but it should not be confused with a complete vehicle speed-density conversion harness.

Buy the STM Speed Density Sensor Kit GM AIT & 4 Bar MAP for your Mitsubishi Evo 8 or Evo 9 and shop quality Mitsubishi Evo engine-management parts at evomotorparts.com.