Warmonger, from your descriptions it sounds like you get a fair bit of control. The workings of the air flow and fuel parts make sense to me in principle - just adding or subtracting to the feedback signal from the MAF in order to get the PCM to instruct the injectors to put out the fuel that you really want to see - very similar to the MAFterburner and APEXI approaches. And tuning is done by monitoring the exhaust for rich/lean. But the ignition timing is what separates the GReddy and that's the part that I'm unclear about in terms of timing. What response are you monitoring as you adjust the timing tables? Is your only feedback the onset of detonation or is there something else that you can monitor to be sure you aren't putting your engine in peril? By the way, what is it that prevents you from reducing the fuel input to lean things out? Thanks.
Eric