I believe there is something in the GEN V control system that is sabotaging us. Something that is completely baffling me is how I can run my LT1 with a 228/236 cam under idle type loading conditions at 500 rpms and it run smooth as stock?
I used the dynamic testing tools to lock the TCC and lock it in 4th gear and basically idle up a hill at 500 rpms with a OLSD tune. I regularly do this to tune the high load/low rpm cells in the VVE table. However I logged this and you can see how I am at almost the exact same load on both MAF and MAP and around the same or lower rpms, only difference here is one is moving and the other is at 0 mph.
I am not sure I can even believe this, how is this possible with the huge cam (228/236 .635/.635 114-LSA) I have it is running this smooth, compare the left side of the graph where I am moving up a hill at 10 mph to the right where I am at 0 mph:
Capture.JPG
Look at the left side with its smooth RPM error and its constant flat line of spark advance along with the constant EQ error and wideband reading, then compare that to the right side with the timing bouncing all over the place and the jagged idle RPM error. How can this even be explained? Basically once the torque sources go from "axel" to "idle" the car starts running like crap.
I mean I expect to have diminished idle (and low rpm operation) quality with a cam, but how much to expect I am not sure. But according to what I see here and feel while driving you apparently don't have to sacrifice any driverability with a cam? But unfortunately the stupid GEN V control system with all the stuff going on we can't see and all the stuff that makes sense that we don't understand is apparently sabotaging our driveability and idle quality by throwing timing all over the place. As far as I know there is no difference in the 2 different loading scenarios on the engine, in fact it seems the load when moving would be more unsteady.
I really hope someone can explain this, or maybe in fact the DI and GEN V combustion system are just so good it can run with a cam like stock?
Log 97 Comparison of low rpms at idle vs under load while moving in high gear with TC locked.hpl