sil80drifter wrote:I am using SAFCII, and don't know how this works for you guys, but I have it set for throttle position at 40% (low throttle) and 80% (high throttle), NOT TURBO YET, just installed the injectors.
I got 460cc injectors and at -25% all across the low-throttle settings, my car pings like crazy betewen 1000 and 3000 rpm, when just press the gas and there is a LITTLE load. My high throttle map is set to -30% all across the board, but when I hear the ping under low-throttle and punch it, (throttle position around 80% to 100%+) the ping goes away, as if the mixture richens out enough to not ping. It doesn't make sense to me.
-25% on low throttle + little load between 1000 and 3000rpm = ping-30% on high throttle, same rpm range at WOT = no ping. what is the matter here???
Is there a timing issue here? Do I not understand something about higher flow injectors? Is there something I am doing wrong with SAFC? Input is highly appreciated!
sil80
This has nothing to do with your throttle settings, well, indirectly. It has more to do with the nature of piggyback systems.
In order to allow your car to run larger injectors, the piggyback ALTERS the MAF signal, which tricks the ecu into thinking less air is flowing, and thus, opens the injectors for a shorter amount of time. However, the side effects of this is timing gets screwed up because now the ecu is looking up the wrong entry on its timing map because of the modified MAF signal.
I've also had this problem with the emanage but fortunately I have an ignition map that I can play around with to semi-fix that problem.
This is why HACKED MAF, piggybacks, dual MAFs, Z32 mafs etc etc don't work unless the system can also account for the timing changes.
Try backing down your base timing by a few degrees. I wouldn't be surprised if it takes more than 5 degrees to stop the pinging. But your performance will suffer across the board.
Do you have EGR?