Your first mistake is going off of hearsay instead of following the OEM documents.
Your second mistake is assuming that anyone of so called "pro tuners" has any clue about this. No they don't, all most of them know is how to % the torque limiters, with a few exceptions.
I seriously doubt anyone has ever looked into tweaking PU -> PUC transitions.
Instead of comparing calibrations and doing god knows what else, log the exact parameters.
Most likely you don't like the delay between normal state and PUC, this is called PU.
You can try changing to zero:
id_t_min_pu
ip_t_min_pu_cs[0]
ip_t_min_pu_cs[1]
Ah, so I had ASSUMED the people here had some general hacking interest, not just adjusting torque targets. You're suggesting that most of them don't. Noted.
And -
if I get rid of lv_pu entirely, what EVER will I do about all the flame and bang? That's also a problem. (note the sarcasm)
Those tables you mentioned are what help with/control rev hang (the cs ones are what force the car in lv_pu for a set period of time while you're shifting). Already 0'd those out and it makes a world of difference during *clutch in* conditions.
I do think forcing the car through lv_pu into lv_puc quicker is a fix, but I don't know if it's *the* fix. I haven't tried it myself but 2 friends did and they said the tach does some weird things. They set c_t_max_pu to very very low values - think .1. Here, the throttle does close immediately (.08 seconds) after letting off the pedal. Screenshot of the RPMs attached.
FWIW, the throttle *DOES* close in lv_pu "long" before the car switches into lv_puc. So there's some airflow behavior while *in* lv_pu that's causing it. I *do* know/acknowledge what you're saying about deactivating the cylinders. So I know the throttle isn't a good indicator. But in the log I originally attached it stays WOT when my pedal goes to 0. The only thing the car actually does when I let off the pedal is open the DV to start reducing airmass.
I had thought that the issue might be mechanical. I have a hybrid turbo with a big compressor wheel using the stock DV. The DV opens, it just takes a really long time for the put to actually come down. It doesn't drop as quickly as put_sp does (which doesn't drop that quickly at all anyway). My one friend has an IS38 and the other an IS20 and their cars exhibit the same behavior it just doesn't seem as pronounced as it is in my car.
As always, I appreciate your replies @prj.
