I have my AFR's exactly how I want them for closed loop boost and WOT and my tune is pretty much spot on at this point. For closed loop it's between 13.0 and 12.5, and at WOT it's between 11.7 and 12.0. Pretty much perfect. This is done by skewing the O2 sensor and removing and adding fuel by modifying the fuel injection pulse.
However, my timing is still not where I want it to be. Cruising on the highway it runs 24-25 degrees of timing advance with the highest value occurring during downhills where it hits 30 degrees. However in closed loop boost that drops to 13 degrees, which will max out at 15 degrees at WOT near redline. With the methanol injection and 91 octane fuel, I'm really running about 96 octane fuel so I should be able to handle more ignition timing without any spark knock/pinging.
I'm going to be utilizing the third fuel map, the MAF table to try and increase ignition timing. From looking at past runs, I know that the MAF voltage peaks at 4.74 volts at 5500 RPM and the low is 1.4 volts at idle. I'm hoping to either modify or clamp the MAF voltage, say about 3.5, to trick the ECU into running more advance ignition timing to gain more power. I've got plenty of fuel to use, since some of my values on the fuel map are -20%, with the max being +10% at redline. I need to collect more data on when the engine starts pulling timing and at what MAF voltage so I can clamp it at that point in an attempt to advance ignition. Here goes nothing!
