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If you plan on running the engine above 6500 feet (2000 meters), you will need to reduce the minimum baro correction value from 80 kPa, as this is the point where normal atmospheric pressure drops to 80 kPa.

The defaults for вЂMax and Min KPA for Baro correctionвЂ™ are normally fine.

Under вЂMore Settings > Barometric CorrectionвЂ™:.

Under вЂBasic Settings > Engine Contants 1вЂ™ turn Barometric Correction вЂONвЂ™.

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Software Configuration for MSnS-E (029 and newer)

Power your MegaSquirt OFF and back on-this is required before several of those settings will take effect.

Set вЂConstant Baro CorrectionвЂ™ to вЂExtra MAP fitted to X7вЂ™.

The defaults for вЂMax and Min KPA for Baro correctionвЂ™are normally fine.

Under вЂCode Config > Barometric CorrectionвЂ™:.

Under вЂCode Config > MAP Sensor SettingsвЂ™ set:.

Under вЂContantsвЂ™ turn Barometric Correction вЂONвЂ™.

Expend SETTINGS.INI, then SETTINGS, then MAP_SENSOR and set it to вЂќMPXH6400A вЂ“ MPXH6400 вЂ“ 400 kPaвЂќ.

Before opening MegaTune, open the Megatune Configurator.

Software Configuration for MSnS-E (pre-029) ThatвЂ™s it! Realtime baro correction is enabled on your MS-II! A value of 60 kPa will be good for up to 13000 feet / 4000 meters. If you plan on running the engine above 6500 feet (2000 meters), you will need to reduce the minimum baro correction value from 80 kPa, as this is the point where normal atmospheric pressure drops to 80 kPa. MS3 puts these under Basic / Load Settings -> General Settings.Д«urn to ECU and click close. In MS2/Extra, this is found under Basic Setup -> General, Lags, and you also need to set the Realtime Baro Port to MS2 AD6/JS5. Other firmware variants put the setting elsewhere. Open Settings>General and set вЂBarometric CorrectionвЂ™ to вЂTwo Independent SensorsвЂ™ and set to these values:

Open Tools> Sensor Calibration and set to these values:.

Expand SETTINGS.INI, then SETTINGS, then MAP_SENSOR and set it to вЂќMPXH6400A вЂ“ MPXH6400 вЂ“ 400 kPaвЂќ.

Software Configuration Changes for MS-II and MS-III

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ThatвЂ™s it! If you ever upgrade to MS-II you can remove it then (I tested the capacitor with MS-II/III with no ill effect, though itвЂ™s not needed so I donвЂ™t recommend it with MS-II and later). Just solder it into the C1 holes in between the two MAP sensors.

If youвЂ™re running the MS-I with MSnS-E youвЂ™ll need that. If youвЂ™re running a MegaSquirt-II or III thatвЂ™s all you need to do for the hardware install! You wonвЂ™t need to do anything with the. (Look at the endplates, if the endplate with the DB37 is cutout for the shape of the connector it should fit fine, the older cases just had a rectangle cutout for the DB37 connector and will not fit.) All of вЂ™s ECU cases shipped since early 2006 have the proper case, some older kits/ECUs may have a different case without the proper amount of clearance. NOTE: You will need about 1/2вЂі of clearance between the PCB and the case. This is the same whether youвЂ™re running MS1, MS2, or MS3. Then solder the wire from the hole labled вЂBaro OutвЂ™ in the corner of the PCB over to JS5 on PCB3 or 3.57 units, X7 on PCB2.2 units. A small washer is included for PCBv3 cases that have a larger MAP hole, to be placed on the bulkhead fitting inside the endplate as shown. One sensorвЂ™s nipple lines right up where the 4250вЂ™s output would have been, so it will line right up with the hole in your case. Installation is simple, it just solders right in where the standard MPXH4250 would normally go. The new design has a blue circuit board, and the barometric pressure sensor does not have a hose barb. It has since been replaced by a new design that used a 4 bar MAP and a 1 bar barometric pressure sensor. These notes cover the original MapDaddy with a hose barb on both sensors and a green circuit board.

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