Calibrating AEM 5 bar MAP

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cardelino18
MS/Extra Newbie
Posts: 18
Joined: Tue Oct 04, 2016 9:31 am

Calibrating AEM 5 bar MAP

Post by cardelino18 »

Ok so i wired up the MAP sensor and i picked the aem 5 bar option for the calibration on the settings, problem is that when i go with those settings the map reads ~30kpa with the engine off, and a friend of mine says it should read 100kpa, so when i adjust it to read 100kpa with engine off, its off under boost by around 10psi. my boost gauge reads 15psi, but my map sensor is reading around 115-120kpa... what am i doing wrong?

Per the aem instructions : http://aemelectronics.com/files/instruc ... Sensor.pdf

signal grnd - grounded to the body
sensor power (5v) - tapped it into the TPS sensor wire
signal (input) - the wire from ms3x that reads ext-map

i set the reading on the setting to ext-map.

Also, i noticed that to get a very accurate reading from my A/F gauge, i needed to ground it to the same ground of the ms3x. is that the same for the MAP sensor?

any help would be really appreciated!

Thanks in advance guys!
CRSTune
Experienced MS/Extra'er
Posts: 338
Joined: Thu Oct 20, 2016 9:12 pm
Location: Manassas, Virginia

Re: Calibrating AEM 5 bar MAP

Post by CRSTune »

Sensor ground absolutely needs to go to the MS sensor ground input pin.
I'm in the VA/DC area! Let me know if I can help you locally! I offer tuning and troubleshooting services.
http://www.msextra.com/forums/viewtopic ... 37&t=64269
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