Just starting out on some tuning for this car, coming from a background of GM tuning and having lots of fun learning the complexities of tuning Fords.
The car is mainly a toy, not daily driven, and just something I like to tinker with. Major mods are Kooks 1-3/4" x 1-7/8" stepped headers (part number 11542300), Kooks Green Cat X-pipe (11543300), 3" resonators, and factory axle-back pipes/mufflers with actuator valves. I just installed 4.56 gears on a new Torsen T2R differential and a QA1 carbon fiber driveshaft. Minor mods that could possibly affect tuning are Ford Racing/Airraid "blue" air filter, UPR catch can, and mildly ported (smoothed) throttle body. The car has 32k miles on it and runs great. I just loaded my first custom tune on it yesterday, which was simply to change the Speedo information from reading from BCM to calibration, and making the proper changes there.
Prior to this, the car would "buck" when shifting, and I thought I was going to have a problem trying to figure out what was causing it not to apply commanded throttle smoothly when releasing the clutch and adding throttle on an upshift, but it turns out that those changes completely resolved that issue. Not sure why it wasn't reading them from the BCM properly, as I had initially set the gear ratio and revs-per-mile in the scanner to change the BCM values there.
Now that's fixed, so I want to be sure my headers aren't causing any issues. As I said, I've had no issues with drivability thus far (the headers have been on for about three years now), but since I've bought the credits and have the license, I'm interested in tuning to take advantage of the better flow with the headers and hi-flow cats. Yes, I've had the P0420 and P0430 codes off and on since installing the headers, and I've just cleared them with an old nGauge any time they've popped up (my state is still a non-testing state). The VCM Scanner was showing those codes to be permanent, however when flashing for the gear ratio changes last night, those permanent codes were removed. I want to make sure they stay removed, so I've disabled the two codes and also the Catalyst MIL in Engine Diagnostics -> Exhaust.
I've read about O2 transport delay until my eyes bled, and I still don't see a definitive answer on how the ECM utilizes the table (along with the time constant) to determine the proper/expected delay. When logging Total Transport Delay last night, my numbers were between 2 and 3 times the numbers in the default table, but I can't imagine increasing the table entries by 200-300% is the best way to go. The car has always driven great and has plenty of power with no hesitations anywhere in its range, so maybe the answer is to leave that table alone. Advice appreciated.
I've attached a log of about a 20 minute drive around town with a mild WOT blast toward the end. If anyone would care to look at it and see if there are any glaring issues that I should look into, I would greatly appreciate it. The only thing that stands out to me thus far is the B1 fuel trims seem to be lagging negative quite a bit. Since I didn't do any scanning until recently, I don't know if that's new or something that has been there for a while.
Thanks for any opinions, dialog, and discussion!
Drive Around.hpl