Weight Diff Steel Vs PCCB
01-03-2016, 01:42 PM
#2
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It's about 1/2 that IIRC. Some of the weight savings of the ceramic rotor is offset by the larger and heavier calipers.
01-03-2016, 01:58 PM
#4
Race Director
Both the standard brake package and the PCCB's use monoblock aluminum calipers; 6 piston front and 4 piston rear. I don't think there's a difference in caliper size so I believe that part is a wash.
As Sloopy mentioned, one of the brake vendors posted weights a while back for the cast iron and PCCB rotors. IIRC, total weight savings is in the range of 35-40 pounds despite the larger ceramic rotors.
As Sloopy mentioned, one of the brake vendors posted weights a while back for the cast iron and PCCB rotors. IIRC, total weight savings is in the range of 35-40 pounds despite the larger ceramic rotors.
01-03-2016, 06:17 PM
#6
Race Director
Both the standard brake package and the PCCB's use monoblock aluminum calipers; 6 piston front and 4 piston rear. I don't think there's a difference in caliper size so I believe that part is a wash.
As Sloopy mentioned, one of the brake vendors posted weights a while back for the cast iron and PCCB rotors. IIRC, total weight savings is in the range of 35-40 pounds despite the larger ceramic rotors.
As Sloopy mentioned, one of the brake vendors posted weights a while back for the cast iron and PCCB rotors. IIRC, total weight savings is in the range of 35-40 pounds despite the larger ceramic rotors.
01-03-2016, 06:30 PM
#7
Nordschleife Master
10 lbs, per wheel/corner, after controlling for all differences in sizes of calipers, etc. 40lbs total rotating mass. Fact. Not speculation. Porsche has put this information out now. Explicitly in writing.
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01-03-2016, 06:57 PM
#8
Nordschleife Master
IIRC the LWB's are an additional 22lbs savings. I'm sure Mike will clarify this, he seems to have a much better memory than I.
01-03-2016, 07:24 PM
#9
01-03-2016, 10:55 PM
#10
Former Vendor
Front OE PCCB (410 x 36, 2-piece) - 15 lbs
Front OE Steel (380 x 34 2-piece co-cast) - 24 lbs
Rear OE PCCB (390 x 32, 2-piece discs) - 13.5 lbs
Rear OE Steel (380 x 30, 2-piece co-cast) - 23.5 lbs
Racing or aftermarket 2-piece upgraded 380 mm steel disc assemblies would be typically 2 lbs lighter per corner (roughly, each brand is different) than OEM Iron Co-cast discs but obviously nowhere as PCCB light.
Hope this helps.
Front OE Steel (380 x 34 2-piece co-cast) - 24 lbs
Rear OE PCCB (390 x 32, 2-piece discs) - 13.5 lbs
Rear OE Steel (380 x 30, 2-piece co-cast) - 23.5 lbs
Racing or aftermarket 2-piece upgraded 380 mm steel disc assemblies would be typically 2 lbs lighter per corner (roughly, each brand is different) than OEM Iron Co-cast discs but obviously nowhere as PCCB light.
Hope this helps.
01-04-2016, 12:23 AM
#11
Front OE PCCB (410 x 36, 2-piece) - 15 lbs
Front OE Steel (380 x 34 2-piece co-cast) - 24 lbs
Rear OE PCCB (390 x 32, 2-piece discs) - 13.5 lbs
Rear OE Steel (380 x 30, 2-piece co-cast) - 23.5 lbs
Racing or aftermarket 2-piece upgraded 380 mm steel disc assemblies would be typically 2 lbs lighter per corner (roughly, each brand is different) than OEM Iron Co-cast discs but obviously nowhere as PCCB light.
Hope this helps.
Front OE Steel (380 x 34 2-piece co-cast) - 24 lbs
Rear OE PCCB (390 x 32, 2-piece discs) - 13.5 lbs
Rear OE Steel (380 x 30, 2-piece co-cast) - 23.5 lbs
Racing or aftermarket 2-piece upgraded 380 mm steel disc assemblies would be typically 2 lbs lighter per corner (roughly, each brand is different) than OEM Iron Co-cast discs but obviously nowhere as PCCB light.
Hope this helps.
What does that equate into HP saved by the motor not having to rotate that 38 lbs of unstrung weight?
01-04-2016, 12:35 AM
#12
Rennlist Member
Can Mike, (with his awesome memory) or someone else comment on the weight savings going from the 4-way sofas to LWBs?
(I think many of those weight comparisons use the 18ways, and the 18 ways are heavier than the 4 ways)
(I think many of those weight comparisons use the 18ways, and the 18 ways are heavier than the 4 ways)
01-04-2016, 12:42 AM
#13
RL Community Team
Rennlist Member
Rennlist Member
For the pair:
Adaptive Sport Seats 128.0 lbs.
Regular Sport Seats 97.2 lbs.
Adaptive Sport Seats 128.0 lbs.
Regular Sport Seats 97.2 lbs.
01-04-2016, 12:52 AM
#14
Race Director
Can Mike, (with his awesome memory) or someone else comment on the weight savings going from the 4-way sofas to LWBs?
(I think many of those weight comparisons use the 18ways, and the 18 ways are heavier than the 4 ways)
While we are at it, how much weight do you save by putting in the new lightweight battery that was developed for the RS? This battery is also compatible with the GT3 as far as I know.
(I think many of those weight comparisons use the 18ways, and the 18 ways are heavier than the 4 ways)
While we are at it, how much weight do you save by putting in the new lightweight battery that was developed for the RS? This battery is also compatible with the GT3 as far as I know.
Weight shown is for both seats combined
18 way 128 lbs
4 way 97.2 lbs
GT 2 Sport buckets 78 lbs
I don't have exact numbers for the new 991 LWB's. Keep in mind that the GT2/997 buckets had airbags but were fully manual; no motor for raising the seat. I'll guess that motors might add 5 lbs so figure maybe 82-83lbs for the new LWB's, a savings of around 15 lbs over the 4 way seats..
40lbs for PCCB's, 15lbs for the LWB's, and let's say 20lbs (or more?) for the Lion battery; a total of about 75lbs. For a 475HP, 3175lb car that's the equivalent of an additional 11HP plus the benefits of lower sprung and unsprung weight.
01-04-2016, 12:58 AM
#15
Nordschleife Master
My memory was close but, to be honest, I checked where I had it written down to be sure...
Weight shown is for both seats combined
18 way 128 lbs
4 way 97.2 lbs
GT 2 Sport buckets 78 lbs
I don't have exact numbers for the new 991 LWB's. Keep in mind that the GT2/997 buckets had airbags but were fully manual; no motor for raising the seat. I'll guess that a motor might add 5 lbs so figure maybe 82-83lbs for the new LWB's, a savings of around 15 lbs over the 4 way seats..
40lbs for PCCB's, 15lbs for the LWB's, and let's say 20lbs (or more?) for the Lion battery; a total of about 75lbs. For a 475HP, 3175lb car that's the equivalent of an additional 11HP plus the benefits of lower sprung and unsprung weight.
Weight shown is for both seats combined
18 way 128 lbs
4 way 97.2 lbs
GT 2 Sport buckets 78 lbs
I don't have exact numbers for the new 991 LWB's. Keep in mind that the GT2/997 buckets had airbags but were fully manual; no motor for raising the seat. I'll guess that a motor might add 5 lbs so figure maybe 82-83lbs for the new LWB's, a savings of around 15 lbs over the 4 way seats..
40lbs for PCCB's, 15lbs for the LWB's, and let's say 20lbs (or more?) for the Lion battery; a total of about 75lbs. For a 475HP, 3175lb car that's the equivalent of an additional 11HP plus the benefits of lower sprung and unsprung weight.