The option (other than color) I agonized over the most and how it turned out
07-04-2020, 05:17 PM
#61
Drifting
OK, that settles it then. That IS a lot of weight saved. I'm guessing that diff (weight loss) is much smaller for the GTS 4.0 since it doesn't sport the big reds of the GT4/Spyder.
I think my biggest issue with PCCB now would be the 200 yard gravel/dirt road that connects my house to asphalt. I would guess it drastically increases the risk of either caliper & wheel barrel scoring or, much worse, a rotor scoring from an unlucky pebble/rock that lodges itself in there. Then I saw Janko on the video has a similar gravel/dirt road too.
Did he end up choosing the PCCB?
I think my biggest issue with PCCB now would be the 200 yard gravel/dirt road that connects my house to asphalt. I would guess it drastically increases the risk of either caliper & wheel barrel scoring or, much worse, a rotor scoring from an unlucky pebble/rock that lodges itself in there. Then I saw Janko on the video has a similar gravel/dirt road too.
Did he end up choosing the PCCB?
As always, I could be wrong about his choice. Perhaps you can tell better than I can from this video, at about 4 mins: https://rennlist.com/articles/art-of...he-718-spyder/ Those look like the iron rotors to me.God bless,
TT
07-04-2020, 05:37 PM
#62
Rennlist Member
The tire and wheel he hauls out really illustrate the point! I believe he chose "Big Reds" but with black calipers (he is working on a silver/black color theme for his Spyder) ...maybe that makes them Formerly Big Reds? As always, I could be wrong about his choice. Perhaps you can tell better than I can from this video, at about 4 mins: https://rennlist.com/articles/art-of...he-718-spyder/ Those look like the iron rotors to me.
God bless,
TT
As always, I could be wrong about his choice. Perhaps you can tell better than I can from this video, at about 4 mins: https://rennlist.com/articles/art-of...he-718-spyder/ Those look like the iron rotors to me.God bless,
TT
I wonder if his gravel driveway was a factor in deciding to forego the PCCB.
07-04-2020, 05:44 PM
#63
Drifting
God bless,
TT
07-05-2020, 10:29 AM
#65
Drifting
Back in the 996 era, I asked Walter Röhrl if he could tell the handling differences between the two cars. Always a straight shooter in my experience, he thought for a moment, then said no. I'm not sure I have ever been able to detect a difference in the way a particular Porsche steers or handles with and without PCCB, but I am not sure I've ever had that perfect circumstance in which to try and detect it.
God bless,
TT
Last edited by TomTarzian; 07-05-2020 at 10:54 AM.
07-05-2020, 01:23 PM
#66
Rennlist Member
Pete, you were quoted in a post here in this thread:
https://rennlist.com/forums/718-gt4-...l#post16748669
The part which I understood says that iron calipers and pads are lighter was the bolded part below. Maybe I didn't understand it correctly:
"Thus looking at the front, worn iron rotors and pads with a shaved tire will cut the absolute weight difference to PCCBs to zero (4 lbs of shaved rubber, 2.5 lbs of lost rotor mass, 1.5 lbs for worn pads, while the calipers and pads were 1 lb lighter to begin with = 9 lbs, where the stock PCCB rotor is ~9 lbs lighter to begin with)."
https://rennlist.com/forums/718-gt4-...l#post16748669
The part which I understood says that iron calipers and pads are lighter was the bolded part below. Maybe I didn't understand it correctly:
"Thus looking at the front, worn iron rotors and pads with a shaved tire will cut the absolute weight difference to PCCBs to zero (4 lbs of shaved rubber, 2.5 lbs of lost rotor mass, 1.5 lbs for worn pads, while the calipers and pads were 1 lb lighter to begin with = 9 lbs, where the stock PCCB rotor is ~9 lbs lighter to begin with)."
His point, out of context, had me quickly asking myself: Who wants to drive around on worn-down tires, brakes, and rotors?
But, seriously, Pete's post brings up a good point: A lot of the obsession over various things on paper needs to be put into perspective—and the "massive differences" we see in a forum discussion are in reality not so massive.
I am also guilty of referencing Pete. I believe a key point both of us made is that the benefits of PCCB's are "in the eye of the beholder." We can all certainly disagree in good faith about their benefits...this is a 1st World problem! Wishing us all a blessed Declaration Day.
God bless,
TT
God bless,
TT
To your question, I have seen no experiential evidence that PCCB improves a car's ride compliance. Caveat is that I somewhat dismissed it when Röhrl said he couldn't tell the difference in a 996 Turbo with or without PCCB—but I'll be the first to concede I haven't had a "perfect storm" situation where the difference was plain. It's possible that he hadn't, either?
My view of PCCB has evolved over the years. The "918" system was arguably the best brake system I had tried when I first sampled it in 2012 or 2013, and seems to me a bargain at $7500-9500. Besides the improvements in braking, unsprung/rotational mass, dust, corrosion resistance, and appearance, I think ticking the box for PCCB also makes sense for people who will track their cars—as we've seen multiple 991.2 owners finding even the S/GTS system inadequate for track use. For those customers, PCCB + a set of aftermarket pads & iron rotors is less expensive than an inferior, non-factory setup—and possibly money ahead if the PCCB pads and rotors are sold. As a used car, I'd still look at those big yellow calipers and the rest of the system as an upgrade over a car with standard brakes—though I suspect I am probably one of very few who would.
07-05-2020, 03:19 PM
#68
Rennlist Member
On the GT4/Spyder there is no rational reason to get CCBs to improve braking performance. The stock irons are overkill for this car already. The 991.2 GTS has 50hp more with an extra 200lbs and has very good braking performance using smaller brakes than the 718.
There are other valid reasons to get CCB but improved performance over the irons on this car isn’t one of them.
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