Re: Brake bias / ABS / PTV issues after upgrades and running slicks.
I'm not sure it's as much PTV as PSM kicking in to keep the back-end in check. There are multiple levels of intervention by PSM. Only at it's most severe will the light blink on the dash. However, I can tell from experience it definitely intervenes more often than that.
I've been driving more with PSM off recently, and on corner exit of fast corners where I used to think the back tires were hooking up, I'm now discovering the back-end wants to step out. PSM was keeping that from happening and keeping grip in the rear tires. With PSM off, in that same situation, if the back tires start losing grip, the back-end will come right around and send you on an off-track excursion.
The car has considerably different handling characteristics with PSM off. You have to be much more attentive to what the back-end is doing, and get on power a little earlier in corners to get that weight transferred to the back end earlier to keep the rear tires from losing grip on corner exit. You also have keep committed to your line with equal or increasing power level on exit. If your line is a little ragged and you start thinking you're going to run out of track, any lift-off at corner exit and you're done. My fastest laps are still with PSM on, because I can throw the car around more and know it's not going to break loose. If I took the same line and throttle/brake combinations with PSM off, I would not be able to hold the car on the track. Eventually, I think that will change as I continue to learn and adapt to the movement of the back-end.
As far as PTV goes, I've found it to be less intrusive. When my Pagid pads are cold, I can hear PTV chirping the rear pads, and it's more on turn-in: early-to-mid-corner. At corner exit, the wheel is mostly opened up I don't hear PTV chirping.
digitalrurouni - what OPs post are you referring to?
Last edited by ledbette; 05-24-2019 at 10:40 AM.
2014 Boxster S - Racing Yellow, Sport Chrono, PASM, PTV, PDK, 3rd radiator, Cobb Stage 1 tune (Pagid RSL29's & Nitto NT-01's on the track)