I just wanted to provide my feedback on the 3.1c file.
Startup:
As soon as I turned the key, there were subtle differences, the idle fell to it's normal 750rpm state much quicker & smoother than my old 3.0 file did.
Idle:
The engine idles smoothly and has no variation from what I can see on the cluster.
Throttle modulation is even "smoother" than my 3.0 file, a little bit of the jumpiness of 2.0 is back from idle to about 1k rpm, however as soon as the engine goes past this point it's smooth as silk. I've noticed more exhaust popping when revving in neutral, which is never a bad thing in my opinion, sounds awesome.
Starting off:
Taking off from a stop is no different than 3.0, except the minor issue described below.
The first thing you will notice is a much better response from the engine, torque is noticeably better than 3.0 and 2.0. They married both of these files and took the best of each.
Traction control/ first& second:
First and second gear will spin tires but the traction control reigns it in quite nicely.the program appears to dial back boost and timing, but doesn't cut the throttle plate heavily like stock tcs does. This allows for as smooth of a dialback in power as possible to keep wheel spin to a minimum.However that program is working overtime to contain the spin.
third & up:
third gear pulls and pulls, from idle up to 4k rpm the ecu requests 18psi of boost, and when i say 18 I mean 18 solid, it's like my boost gauge hits a brick wall. As soon as 4k hits, the ecu requests 26psi as indicated by my gauge and the car rockets forward.going from 50 to 100 is as effortless as rolling on the throttle & before you know it, your breaking the speed limit and exceeding it by a fair margin. Got the car up to 110 much quicker than the previous files, and was begging to go faster.
Shifts:
Quick shifting is no longer an issue, the engine responds to the pedal perfectly.it's honestly as close as cable driven throttle as humanly/electronically possible. However I can still get the engine to "pull" the revs down if I shift fast enough. However I don't believe that is a fault in the software, just the dual mass flywheel doing it's thing...
Driveability:
The car is in truth responds to your every input, it's like going from having corrective lenses your whole life and then one day you wake up with 20/20 vision. The clarity of the inputs are a joy to experience.
Criticisms:
The flash took over 2 hours to complete, this was explained that APR servers were bogged down, which I guess it's understandable due to the fact that the file was released only a few days ago, however i think they need to upgrade their internet connection/server to handle these types of requests.
slight jumpiness from idle to 1k, but it's only noticeable from a stop and when idling in first with the car moving, the throttle input is very sensitive which leads to a little bit of jerkiness from the motor which then goes away almost immediately, however I'm more sensitive to these little glitches than most, and others may not notice this.
My cbfa engine revs do not drop quickly at all when the car is on its air injection cycle, however I don't think this is truly a fault with the software but I'll leave it here until clarified.
I'll update this as I notice things but I feel this part is going to be a short list.
Final thoughts:
This is the epitome of the APR ko4 revisions,I firmly believe there will not be any more "incredible" updates after this one.They nailed this one on the head. addressing so many complaints and brought back the best features of the previous files. I can say I'm happy with this revision. Jamie & the rest of the crew that worked on this did a fantastic job. Anyone on the fence about this should immediately get this flash done.
I cannot wait to see comparisons to other competitors files.