Stock brake subsystem.

 

An e-throttle still open and closes the throttle.

 

You are right. I stand corrected. I was able to generate the rasp by a quick strong blip, even at standstill in neutral. And if I blip after the autoblip I can duplicate the exact same rasp. Could it be from the throttle bodies?

Driving in the quiet of the night I can even hear a soft "glitch" when I gently tip in the throttle. Not sure if related to the rasp. Both throttle related.

 

its more of a click than a rasp

 

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These cars make a whole host of noises that you either live with and move on, or obsess over. I fretted for a while, but then moved on. Nothing wrong with wanting to understand them, though, of course. I am sure the dealers must get driven nuts with people asking or bringing their cars in for "repair."

Your comment above confuses me. Either you don't know what track braking is like (vs street), or you brake on the street like a lunatic. lol

 

I know. I have Ferraris. They make way many more noises than this. Still, the rasp (not from an exhaust heat shield) is a new one for me. I am an engineer. Just want to, as you said, understand it, is all.

I'll reiterate my pedal comment. The brake pedal on my car (btw, with PCCBs; don't know about steels) is set up too high for heel-toe. For me. YMMV. For reference, with car at rest, at firm/full engagement the brake pedal is 3" above the throttle. That difference/distance is bigger than what I am use to, too big for my right foot to roll over and cover comfortably in daily use. No, I don't drive like a lunatic. No, I can't make the brakes fade on the street. Imo, the original response (not yours) which brings up track use is gratuitous, irrelevant. This is a GTS, not a Clubsport. It's a street car, period. Nothing else in the car (stock) is set up for track day. You mean to tell me the brakes are?

 

Injectors click. This is a rasp. Thinking about it, mostly likely from a stepper motor actuator moving at max speed.

 

I would imagine car manufacturers of cars that will likely see track use have to choose about pedal engagement point...track based or street. Heel and toe is usually associated with track driving, in my estimation, so seems normal they would bias towards track. People that don't track all that frequently will likely disagree, but then they are also probably far less likely to be the sort that uses heel and toe.

This is my first Porsche with PCCB, and its first track date is this Spring, so I admit am curious how the supposed lessened ability to modulate the pedal with PCCB will interact with HnT. TBD I am sure plenty of folks can comment, and we will get assertions on both sides of that fence (works great / harder to do).

I will say that lots of owners of non-CS Porsches track their cars, and that Porsche therefore expects them to, and designs the cars accordingly. That's one of the reasons we love and buy Porsches. If you don't think anything else on these cars is set up for the track, then I suggest spending more time in non-CS Porsches on the track. That is not my experience at all. Even the humblest boxster is amazing on the track. If your bar is Challenge Stradale to be remotely competent, than I guess my point is lost.

But this is one of the main draws of Porsche...pretty much anything they make you can thrash all day at the track, do VERY well in it, and then drive home that night. (pads, brake fluid, and maybe tires notwithstanding; ie wear items only) They build them for just that. All of them.

 

These PCCBs are amazing so far (mountain passes, not track.) Totally linear/progressive. Zero screech. And, of course, zero dust. Unlike early CCBs which scrape, screech, grab. Talk about noises.

 

To your point, regardless of the correctness of intention / design, yes, the brake pedal engagement is high for normal HnT on the street. Heroics, and limber ankles, are required. PCCB likely exacerbates that.