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Originally Posted by FTS
I cannot speak for 991 electronics, but keeping the electronics on the 997 GT3s make it more dangerous near or at the limit. The electronics are really not designed for it. So, when you are at the limit in a corner, with a balanced slide and you apply the throttle, PSM thinks you are about to spin and applies the outside rear brake to stop any rotation, which then shoots you off track. Same at corner entry, if you are too sudden with the brakes, the front dive is too pronounced due to lack of enough springs, ice pedals greets you (although this happens even when you turn off the nannies, but less frequently).
After few unpleasant surprises, I turned off the nannies, except traction control. It is not about leaning the GT3 or 911 or being brave, but you cannot get near the mechanical limits of the car with the nannies safely. I hope this improved with the 991, but I doubt it withe the standard shove in the face of PTV  |
Why does it brake the outside REAR to counteract oversteer? Everything I've read about stability control, as well as common sense, says that oversteer is best controlled by braking the outside front (and understeer best controlled by braking the inside rear). Braking the outside rear definitely seems like it could have nasty side effects, or at least be a lot less effective, especially if the rear has already begun to lose grip while the fronts are still fine -- which would happen a lot given that that's basically the definition of oversteer.