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June 29, 2007
LRP Wear Measurements
Summary: Tire wear measurements were inconsistent, but the V710's grip and wear well. They are all starting to show separation at the butt splice in the center of the tread, after 1 day at Watkins Glen and 1 day at Limerock. Front brake pad wear was about .050-.075" at the front, and inconsistent in the rear. If the front pads wear about .070" per day, have .190" backing plates, are .800" total thickness new (.610" pad material), and wear stupid fast once pad material is down to .190", that gives 6 track days per $100 front pads, or $17/day.
I went through about 27 gallons of gas in about 50-75 laps, but something odd is going on, causing the Camaro to run very rich.
Tires: New Kumho V710's at Watkins Glen, 275-40-17's in the front and 315-35-17's in the rear.
Tread depth at wear holes: Inside-Groove-Middle-Outside
#1 RF .140 .132 .132 .132 (to be run on left front)
#2 RR .130 .126 .132 .135 (to be run on left rear)
#3 LF .110 .130 .130 .110 (to be run on right front)
#4 LR .130 .128 .132 .125 (to be run on right rear)
After LRP:
#1 LF .135 .130 .125 .120 (about .005 wear)
#2 LR .140 .130 .125 .125 (inconsistent)
#3 RF .125 .114 .125 .110 (inconsistent)
#4 RR .148 .140 .142 .130 (inconsistent)
I guess this means the tires didn't really wear that much. I'll see what it's like after another 2 day event.
Rear Pads
Rear before WGI:
PFC 90's 0413.90.13.04
.496, .471, .448, .405
Drivers Rotor .780"
Pass Rotor .785
Before LRP: drivers outer - .400" including backing plate
pass outer - .350" including backing plate
After: drivers outer - .350"
drivers inner .460R .480F
pass outer - .380"
pass inner .430R .435F
Not much wear, and inconsistent with an estimated first measurement. Inside pad has a .200" thick backing plate and outside pad has a .160" thick backing plate.
Front:
Wilwood Polymatrix B - 15B-5939K (7420 w/ bridge bolt)
C5 Rotors, both at 1.260 after LRP.
After WGI Front Pad, then after LRP (changed from left to right to reverse taper) :
#1 DriversOuter: .690 at front and .602 at rear, .635 middle top and bottom
After LRP: .575F .540R .550T .570B
#2 DriversInner: .638 front and .620 rear, .609 middle top and .640 middle bottom
After LRP: .597F .584R .604T .600B
#3 Pass Inner:.722 front and .625 rear, .673 middle top and bottom
After LRP: .620F .620R .625T .635B
#4 PassOuter: .638 front and .622 rear, .626 top middle and .642 bottom middle
After LRP: .585F .535R .550T .570B
The taper wore off nicely, and pads are much flatter. I think this is due to being a bit more gentle on the brakes, and doing a more thorough job bedding in the pads to the new rotor. The pad wear was about .050-.075" once flat.
50# 17x9.5 C5 wheel (speedline) with 275-40-17 Kumho ECSTA Supra
Posted by Z28tt at June 29, 2007 9:44 PM