Aeka GSR

iTrader: (4)

It seems like the AEM does not have any kind of voltage smoothing for the MAP signal and it is a bit difficult to tune. When the car is off the map signal is fairly stable, under idle it moves around a bit but still stays within a cell. However once I start driving the map signal jumps across several cells at a time. When I had my powerfc this was not an issue.

Has anyone encountered this? Is there a way to smooth out the signal? I'm going to run some fresh wire from the map sensor to the computer to see if the problem clears up.

scotty305

iTrader: (2)

There is an option called MAP filter, you should be able to find it in Setup>>Sensors>>MAP sensor>>options. If you filter the signal too much, the car might not respond very well to quick throttle inputs. I've got it set to 10 in my car's calibration, don't remember when I adjusted it but 10 seems to be working OK from what I can tell.

Aeka GSR

iTrader: (4)

oh wow. I saw it before and "teeth" made me wonder what the hell it was for since I couldn't equate crank teeth with the map signal. I will try this first thing in the morning and I'll let you know how it went.

D Walker

iTrader: (1)

If you save and send a datalog along with your cal file and setup specifics I will be glad to take a look at it. I personally have never had an issue with the MAP sensor jumping around erratically.

Just out of curiousity, what MAP sensor are you using?

Aeka GSR

iTrader: (4)

gm 3bar. The filter fixed the problem. Everything is well =)

D Walker

iTrader: (1)

The GM 3-Bar is notoriously in-accurate, have you thought about replacing it with an AEM 3.5 or 5 bar sensor?

Aeka GSR

iTrader: (4)

as long as it is consistently inaccurate, I shouldn't have a problem. I've been running 400whp with no problems on my PowerFC with it.