I have been chasing a WOT tune problem for a while. This weekend I had my first chance to test on a track, and was able to determine a few things. My base parameter file is attached.
If I hold the throttle just shy of WOT, it will pull all the way through the 1/4 mile.
If I hold WOT at any point for more than about 2 seconds, it will hit what I believe is an overcurrent trip and shut off. Since I was on track, I couldn't pull up the error message before power cycling. (once I power cycle it starts right up and will run fine to get off track.) I have GoPro footage of the runs I haven't gone through yet to get some more accurate timing and see if that helps at all. I believe that it was at least 2 seconds because my 1.9 sec 60-foot time with a WOT launch was better than my 60-foot time when holding just shy of WOT.
I tried launching by holding throttle and brake, then dumping brake, and by rolling into WOT both quickly and slowly. All three ways, any sustained WOT caused a trip, and seemingly regardless of speed.
I tried the following, with no success:
- Raise fweak
- lower fslipconstmax
- lower fslipmax
- lower both fslipmax and fslipconstmax
In theory, my tune is "softer" than Jon Volk's or BoxsterEV's. I'm at a loss here, I cannot figure out what is going on.
I do not have a data log of the runs. My phone won't reliably connect to the LDU when I'm not physically holding the phone up to the LDU case, and I don't have a way to secure a laptop in the car. I'm working on a plan for the later, or a cheap tablet to do the same.
If anyone has some ideas, I'm all ears. The only possible idea I have that I haven't checked yet is maybe the potmax value is too low and WOT goes out of range? But I'm not sure why that wouldn't be instantaneous. Is there some other parameter that only comes into play at WOT that I'm missing?