[gahanna-6.4]

The 6.4 throttle response is not sluggish due to turbo lag. The sluggish feel is due to the 'fly-by-wire' throttle setup. The computer is dampening fast sharp throttle changes at certain lower speeds, especially from a dead stop. If the truck is completely stopped and you floorboard it (without power-braking it) the computer will dampen the throttle throw. Same if you're just rolling along under 25mph or so. I've found many speed ranges where I cannot even 'blip' the throttle... no response at all on fast blips. Im assuming Ford has done this to decrease jerkiness, prevent drivetrain damage or prevent occupants from bashing their heads on the headrests. I've also found that the computer wont return the throttle right away either in some instances. I was in a drive-thru and blipped the throttle while pulling up in line and it held itself 1000 rpm or so for about a second - definitely felt kind of weird. I was also able to get a CEL while playing around in a parking lot blipping the throttle. The truck began idling around 900 in or out of gear and the response was horrible as if it was in limp mode. To clear the CEL all i had to do was shut it off and restart it. Now that I have the SCT I'd like to try to get that CEL again so I can post the number.

Im sure the Ford engineers put a lot of time and effort into making our driving experience much nicer by dampening the throttle response for us... but I dislike it. If the electronic throttle position scale goes from 0 to 100 and I call for 100, i want it opening the throttle body instantly to 100, not ramping it up to 100 over a 2000ms time step.

I'm hoping that in the next release of tunes from either SCT or Spartan that they have the ability to get into the portion of code that controls this dampening on the throttle response and tighten it up a bit so that the throttle response is a bit more like having a physical cable connected to the throttle body.