MegaSquirt S-AFC Conversion
The Plan
To implement a MegaSquirt stand-alone fuel controller, eliminating the need for the AFM and allowing the fuel mixture to be self tuned.
The Reason
Using this system will allow the highly restrictive Air Flow Meter (AFM) to be removed, improving throttle response and power output. The MegaSquirt uses intake manifold pressure and RPM as its main inputs, along with others (throttle position, air temperature, coolant temperature) to calculate the proper fueling mixture. There is some work involved in this, however.
First, you must BUILD the system yourself. For about $300 you can get all of the parts needed, and that is a steal for what you are getting. Similar systems go for well over $1000. You also must tune the volumetric efficiency (VE) tables yourself. MegaSquirt uses these as a baseline for how much fuel to add at various engine speeds & manifold pressures. Similar tuning must be performed on other systems as well.
What will this do for me? Well, it will allow me to try to keep the mixture optimized for power production when I need it. A dyno reading from my car from a couple years ago shows that it runs a bit lean at higher engine speeds. I will be able to remedy this with some careful tuning. I will most likely have a few configurations made: one for power, one for economy & maybe one "special" one for smog check time.
I have scrapped this project. While I nearly had my first car running from it, other electronic control projects have taken my interest from the MS. It is a VERY good, capable unit, and I am not abandoning it because of any sort of dissatisfaction with the unit itself. Installation was a royal pain, which is to be expected with something like this. I am planning to design my own engine control unit though, hence the calcellation of the MS project.
Parts Needed