Has anyone logged actual pedal position vs. actual throttle position enough to notice anything weird on these E38's? I've been trying to figure out why the correlation between pedal and throttle vary between two distinctly different modes. Most of the time the throttle will open ahead of the actual pedal position, which makes acceleration feel stronger since your foot isn't pushing down more, but the throttle is still opening more. Stock trucks do this normally. (I'm talking about E38's in 5.3, 6.0 and 6.2 trucks and SUV's.)
The other mode, which seems to come and go at random times, is that the throttle will stay tracking pedal position, without the throttle opening faster and more than the actual pedal movement. When it goes into this mode (I call it low throttle mode) it will stay that way all day. It almost always goes back to normal the next day. It might not do it again for a few weeks. It has nothing to do with the actual tune, it will switch back and forth between these two modes on the same tune. (Meaning it's not something I change in a tune, it goes back and forth in between tune changes.)
My guess is there are some parameters that we don't have access to that affect the relationship between pedal position and throttle position. I wish I could figure this out, there is a huge difference in the feel of the power when it's in this "low throttle" mode. I can tell it's doing it as soon as I start driving, it just feels a little "flat" compared to when the throttle is advancing ahead of the pedal. I believe what I'm trying to describe is the equivalent of the throttle cracker and follower in the older LS1's?
Thanks guys, hopefully someone has seen this. If I get a chance later I'll try to post up a screen shot of the logs that show the difference.