I just put a TSP Stage 1/2 228/236-114 .635/.635 cam and ported heads with 015in milled in my LT1 Camaro and nothing is making sense.
I've been trying to tune VVE and I have raised the coolant temperature limits to turn the MAF off, put in the maximum seconds to the closed loop enable delay, and disables LTFT coolant temp enablers as well (There is no STFT disablers I can find in my tune). I was able to make some corrections to decrease the VVE table in the lower RPMS (about -20%) based on wideband feedback, but when I tried to make more adjustments to more areas of the table it kept calculating bad coefficients.
I turned my attention to the MAF calibration, even though I am a strong believer in the only time you need to change MAF is when you alter the air intake by the sensor and any other time you change it is just a "band-aid" fix. I did'nt really get anywhere with the MAF, especially since the stock scaling basically maxes out in the 8500Hz range and with my cam and heads I am exceeding this reading up close to 10000Hz. I tried to change the scaling to get more resolution and I tried re flashing and the car wouldnt even run on it. So I kind of gave in for now on the MAF even though I don't think I need to change anything (I have a Rotofab intake, which you are supposed to be able to use the stock MAF calibration on).
Basically, I am almost back to stock now, and although, at least today, it seems WOT is running a little better. What makes no sense is WOT feels like it is missing and falling on its face, even though AFR looks decent and isn't too far off of commanded. Timing is around 10-20 degrees, which should be enough to make it run decent, with less power of course, but not enough to make it feel like it is missing and stumbling at WOT?
Even though I have returned all the closed loop and MAF fail to stock enable values, it is still stuck in closed loop. When I use the special functions to force closed loop it goes extremely lean (above 20:1 and past that as the wideband no longer reads) and somehow keeps running. Yesterday it was running rich, although I was running a little more E85 in the tank yesterday and I am returning to 93 to try to eliminate some variables. Either way nothing is following convention or making sense here.
Theoretically, it seems like to me even with the stock tune it should have some room to compensate for the theoretically lower VE at lower rpms and higher VE at higher rpms that the cam requires, besides that I don't get what else you even need, or should, change for a cam swap?
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