Originally Posted by viriiguy
I am the type of person who likes to educate themselves.. And I have done some reading.. Obviously not enough. So would one of you help me to understand why the tune is so horrible?
Tough love in this post. You've been warned.
Let's start with the timing map that you're going to blow your engine up on.
Stock ECUs run 24deg of timing at 100kpa. General rule of thumb says you need to pull ~1 degree for every ~7kpa of boost you add. This is a rough estimate that will get you a fairly conservative map. You might need to pull more than this in the midrange (peak torque is where detonation is most likely to happen), and you might pull less at high RPM to prop up the powerband.
At peak torque (5200rpm), you are running 25deg at 4psi and 24deg of timing at 7psi. IOW, you're essentially running what the stock ECU would request, and adding 7psi on top of that. This would be agressive on E85. It's suicidal on pump gas. If you don't think it's pinging, it's because you can't hear it.
Ignition maps should be taken from a known good basemap and not fucked with by amateurs. If you want to learn how to tune them, start by googling "MBST" or "minimum timing for best torque" and read for a few hours. The difference between "safe forever" and "blown up in an afternoon" is as little as 5 degrees in most cases.
Moving onto the fuel map that some "tuner" fucked with. Your "misfire" is caused by the fuel map jumping from 104%VE to 145%VE between 4500 and 5000rpm at 150kpa (7psi). The cell above that 145% cell is set to 81%, which means that your ECU will deliver about half the fuel at 10.5psi/5000rpm as it does at 7psi/5000rpm. Does that sound reasonable?
Fuel maps should smoothly transition from cell to cell. Idle cells should all be the same, or nearly the same, and fuel requirements should rise and fall with the torque curve (essentially). When viewed in 3D View, the fuel map should look like a rolling hill, not like a jagged bunch of rocks. Your fuel map looks like a seismograph during an earthquake in some places.
If a customer brought me this map to tune, I would zero the entire map and start from scratch.