That's on all the time and comes with the car whether or not you order ACC. But it's really quite a "Last Second" sort of thing. It's not really about avoiding a collision IMHO. I think it's about mitigating the impending damage, by getting the car slowed down as much as possible, in an extremely short time and distance.

 

I'm not sure how long the delay is, but I'd guess at something like 10 or 15 seconds; after which you need to tap the gas pedal or tap the Resume function.

 

Yes, it is incredibly useful. I use mine quite often…although it took me a while to get use to it and feel comfortable with how it works. On the other PID thread, I mention some of the cool things it will do, that the ACC will not.

Per the video I linked, if you are fully stopped behind a car, for 15 seconds or less, once traffic in front of you begins to move, the PID will automatically activate and accelerate your car once the car in front of you begins to (also) move. I suspect the 15 seconds is more useful for stop and go traffic, or stop sign, than as opposed to when you stop at a light. Although it has worked for me at a stop light.

PS - Since I am far more concerned about the system NOT allowing the car to advance, when it shouldn’t, I always have my foot ready down by the brake pedal. So, when the traffic in front of me begins to move, I (usually) just tap the accelerator peddle to get my car moving again….rather that waiting a sec or two for the PID to do that for me. But if I forget to tap the accelerator peddle, the PID will accelerate for me. The delay in the PID activating to accelerate your car is based on what’s happening with the car in front of you. Case in point - if the car in front of you slowly/inches advances, your car probably won’t move until the car in front of you has advanced a 1/2 or a full car length…there’s an algorithm used by the PID that looks at all the variables before taking the appropriate action.

 

I had it on my previous 718 Boxster with 35,000 miles on when I traded and now on the 5,200 on my 2021 911. Never had a single time when it had a fault. I use it almost every time I drive, in stop and go and at high speed on the highway. It is just a very good safety factor, when on high speed driving it only reacts when you need to slow down because of something in front of you. ACC is a not save all like on the self driving cars. If you are at high speed and traffic has stopped in front of you may have problems because it doesn't look far enough ahead of you to made a comfortable stop. It may have to make an emergence stop and not stop in time. There are other quirks that can get you in trouble for instance coming up on slow traffic and want to change lanes at the last minute, and it may start slowing just as you start changing lanes. To me normal cruise control is useless because you have to have 100% attention on the road all the time. As with all options if you think you would like it, get it because most cannot be added later. I did not get FAL and in San Diego very very very sorry.

 

isn’t this what is required when driving a car?

 

My question is do the safety features intervene driving on a track.

I’m sure it’s great on the highway, but my question is should I leave it off a car that will see track days a few times per year so it’s not slamming on the breaks when I’m driving in another car’s slipstream.

 

It only operates when you activate it, so it will have no affect when you are on the track.

 

Point of fact - self driving cars from Tesla have their problems, too:

https://www.bloomberg.com/news/video...llisions-video

The PID System is NOT as autonomous as the self driving system on Tesla…it’s a step or two down from that…and quite frankly, I’m glad it is. IMO, these systems should ONLY be intended to be a driver’s aide, not a replacement. In my case, I use it as a safety aide, to help, or remind me when I get distracted…and we all get distracted, whether we care to admit it, or not. That’s where these systems are worth their weight in gold.

 

Not a fan. Have and have had it on a few cars and SUV's. I've found myself behind slower drivers for too long when I could have passed them. It leads to driving complacency IMO.

 

It does, but ultimately you have the final say as to whether you want to use, or not. There are times when it’s very helpful to have, and other times, as your would say, it leads to driver complacency (ie boredom). I tend to use in situations where it’s congested, and there’s little chance to go fast.

 

If you’re going with PDK, an added bonus of 992 ACC is that you get advanced and improved PDK shift logic in auto that also takes in account of what’s in front of you. It’s quite slick and a nice bonus on top of the cruise control features.

 

No I do not spend 100% of my time looking straight ahead. I am looking in the mirrors, and cars entering from side streets and being aware what is going on around me.

 

I ordered C4S with LKA and LCA but without ACC by thinking that it may be similar to ACC on my Audi A7, which was not very reliable.
Upon checking more and more posts about ACC option, it seems that many of you guys love it.
As my 992 is on a ship already, I can't go back and change option.
Does anyone know if ACC option can be retrofitted?

 

Like most things Porsche related, yes but expect an unreasonable quote.

While it works well and better than other cars I had, it gets old quick and driving the car yourself is far more entertaining.

 

Thanks for making me feel a bit better, John.
I'm just banging my head on the wall about missing out this option for $2K. sigh. lol