Im new to the ATV world, but not to computer tuning or fixing vehicles. Former Nissan tech, as well as some prototype work.
Im trying to understand the gap between the early OBD I automotive tunes (very primative). Versus the ATV ECMs of 2008. And Carb tuning.
Where Im confused is that it seems that the fuel injected ATVs respond identical to a Carb’ed ATV. In the automotive tuning world, this is not the case.
An example being: Add exhaust, you need a tune. Add a new intake, you need a tune. The risks being that the change may cause a lean condition. On most automotive computers, adding these things will not effect anything because the MAP or MAF sensor will tell the computer what part of the fuel/timing map to read.
So my question for those that tune ATVs is this. Do the factory ECMs not have the ability to detect air volume/pressure (MAP sensor Im assuming), and based off of those readings adjust fuel/timing (based off of RPM/load).
Im struggling to understand why a modern ECM (such as the one from my 08 Outlander) can not seek the correct sector of the binary grid when a very small change in air is detected. I mean even the most basic 16×16 binary OBDI automotive map had the ability to adjust fuel and timing if additional air was introduced pre MAF/MAP sensor.
Or is it that by adding additional air, such as the 09 intake mod, makes the high load, high RPM sectors of the maps inadequate?
Looking at some of the power commander maps, they look very similar to OBDI maps that I used to tune.
Anyhow, not trying to start a "need a tune, not need a tune" discussion. I have a power commander already, just want to understand what drives these ECMs.
Thanks
