eCtune

Hey guys, im running a GM 2 Bar map sensor, ac delco 213-1520 I bought directly from the parts store, and using ectunes scaling of.. mbar @ 0V =8 mbar @ 5V = 2041 Key on engine off = 2.45v and im getting about -21inHg of vac at idle and -27inHg coming down from WOT. I know this is a new motor and all but something about this doesnt seem all that accurate. Has anyone verified these scaling numbers for the GM 2 bar sensor?

On my sohc with no pcv I see 26-27\" at idle. 20\" cruise. Sounds healthy for me.

well on the program this morning i checked the key on engine off voltage and the MAP reading was showing 2.31 on ectune, and I checked the scale i have vs what it was reading, seemed to be about .3inhg off. The known values i have are 29.1inhg @ .02v and 29.01psi @ 4.9v but the scale on ectune is 0v and 5v, not sure how if i should bother to change it. My 3 bar electronic boost gauge only shows -19 when my map sensor is showing -20.5inHg but i know the accuracy of the AEM boost gauge may be a little shitty.

Confirm lack of resistance on ground for map; Make sure PA/Baro isn't modifying the seen value; Compare ecu reading to a precision calibrated vacuum gauge. No auto meter or over the counter piece of junk for this test.

ok so basically, test the sensor at the connector rather then reading it right off the laptop, and disable PA/baro and use a mechanical gauge to verify the value. Ill have to see if i can find a vac gauge this weekend.

Just check for resistance on the ground feed; and power feed from ecu if you feel the new to go that far. I've found that sensors aren't exact these days; for instance several map sensors (stock) topping out at a total of 10.1psi and lower; causing customers to melt pistons because they demand x psi even though I highly recommend map sensors for this very reason for anything over 8.

welp the whole reason i went with a ACdelco map sensor brand new is because i know its at least a quality made GM replacement part, they make all the OEM parts for GM. Just unsure about the scalar in ectune thats all, but from what i can tell its not that too far off, id just like to fine tune it before i see randy on tuesday.