Originally Posted by
evolmotorsprt
I've tuned quite a few Mustangs but this is my first coyote PD blower car. I've read the tuning school book, the coyote cookbook, and have scoured the forum and internet for good sources of data. I've spent a lot of time breaking down how the car interprets inputs and the flow of commands through the computer. I've also spent a lot of time in excel building worksheets and looking at other's spreadsheets. I'm just stumped because I feel like I can't achieve positive drivability results. BTW, I would like to thank Murfie for contributing as much to this forum as he does.
The car drives great at light throttle and full throttle, but terrible mid throttle. I find this to be a common issue with most threads about this topic. I've been able to accumulate several gen 3 coyote Whipple and Roush tunes on this forum, and have tried copying the majority of the Whipple file (SD, Spark, Torque Tables, etc.) into the Bullit calibration as a starting point. I then got the MAF in line, made recommended tweaks from the tuning school and coyote cookbook and took the car for a drive.
The throttle tends to overshoot and undershoot, oscillates at times, and just isn't acceptable on any level. To fix this I've tried tuning the predicted throttle angle, the torque tables, and speed density independently as well as combined. My results have either made no difference or have made the car drive worse. I've tried locking mapped points to eliminate variables, smoothing spark, slowing down the reaction of the throttle blade, etc, etc, etc...
So what am I missing? I want to understand what I'm doing incorrectly and how to fix it. I feel like I've been banging my head against the wall for a couple weeks now. I have a load bearing dyno all day Monday so I'd like to have a plan.
I'm considering flashing the entire Roush 2650 strategy to the car as a starting point. Is there really a difference between copying the parameters from the Roush file to the Bullit file, and paying for more credits so I can flash the entire Roush strategy?
I've attached some of the Roush/Whipple tunes I'm referencing along with what I currently have in the car. Any help would be appreciated. Thanks.