INTRODUCTION:
After so many hours spent on trying to tune my VAFC while having a set of check valves, I came across this tech thread by Liam Slusser. The thread explained that it is possible to tune the AFC for boost application without the help of a bypassed MAP sensor, such as the use of missing link or check valve. The theory is simple. MAP input is vital for the ECU to calculate fuel efficiency. The ECU constantly compensates to changes of the power plant through various sensors. What the AFC does is allow MAP reading manipulation while assisting the ECU on fuel enrichment per RPM status.....and there it is..... the AFC "hack" in the works. Unlike a Boost Dependent FMU which only provides fuel enrichment at boost condition, the AFC actually assists the ECU on fuel management at all RPM band. It lets the ECU compensate with the changes while the AFC is manipulating the voltage output of the MAP sensor. It hides the "actual" true reading of the MAP but still lets the ECU thinks that the input is an actual reading. The problem with this AFC 'hack" is that, it has to set the fuel on the "lean" side of the AFC to avoid MIL/CEL with a MAP code. This is where bigger injectors come into play. I do not recommend to try this "hack" with stock injectors. In my case, I'm using a set of DSM 450cc. Please take note that the DSM 450cc rig has nothing to do with the AFC hack. Any bigger injectors will work just as well, but I suggest a minimum of a 440cc set....... -thermalfi'd16
Click me for DSM 450cc injector install
NOTE:
Prior to commencing the tuning/setting process. The AFC must be installed as recommended by the manufacturer. |
