The 26" Hoosiers helped me set a new ZL1 M6 bolt-on fast list record of 11.5000 @ 125.67
Otherwise the car is still bone-stock.
Actual diameter of the Hoosier 335/30R18x12 is 25.8" at 21 PSI.
See
Help selecting replacement DRs for details on my decision process and
Hoosier DOT Slicks vs MT ET Street SS for info on comparing, installing, and testing the Hoosiers.
Car Setup:
Rear: Hoosier 335/30R18x12: 21 PSI cold
Front: Goodyear 285/30R20x10: 36 PSI cold
Fuel: 93 octane E10 pump gas - 1st pass with under 1/2 tank (approx 8 gal)
[Summary]
Last Sunday was a near perfect day for drag racing with DA from -350 to -580. That helped offset the 12 MPH headwind. The track seemed well-prepared, at least in my preferred right lane. Not too crowded to get in 3 hot-laps at a time without shutting down to wait.
Even though I screwed up the first pass I still ended up with an 11.5 ET. It was surprisingly fast between gears. I forgot and left the nannies on after my 2-sec line-lock burnout. Then that strange engine oscillation (intermittent cut-out) came back after shifting to 2nd gear (watch the video). I gotta dig some more into that to find the cause. I'm sure it would have been a 11.3 or 11.4 pass if not for these things.
Just as I had predicted, the shorter tire gave me more power at the launch and the wide, sticky slick tread pretty much kept the wheels planted (except pass 5 in left lane). Even if I did get wheel slip in 2nd gear, it was easy to drive through and recovered traction quickly (except pass 5 in left lane). There's still a short bog on launch if it hooks right away but it recovers much more quickly and accelerates much faster between gears. If I can manage a slight wheel slip at launch while maintaining traction on gear shifts, given some "good air" I'm confident I can break into low-11 territory on nothing but tires.
Once again I've got to adjust my launch technique, shifting, and throttle application. The car behaves completely different with these tires. There's a lot more torque available so I've got to be ready to adjust the throttle after breaking free at the tree. It's so much quicker that I have to wait maybe 1 or 2 10ths sec longer after the 3rd yellow at launch to avoid a red-light. I also have to watch my tach closely to be sure to shift between 6500-6600 RPM. Shifts come up a lot sooner now so my timing is a little off. By the time I cross the finish gate I'm nearing the top of 4th gear, whereas I'd be only mid-way on the Goodyears or MTs.
Below are all the details for each pass, including links to combined PDR/Helmet/Rooftop video. No spectator videos this time. I couldn't get anyone to record them. As always, I welcome constructive criticism and helpful comments.
This YouTube playlist contains all the passes:
20180304 CPD Hoosier Slicks - M6 Stock record 11.5 @ 125 MPH
Let 'er rip! 
--Cal
Time Slip Data:
(My 6th Gen ZL1 was Nr 04)
Code:
2017 6th Gen Camaro ZL1 Opposing Lane
Seq Time R/T 60 ft ET MPH Opposing Car R/T 60 ft ET MPH
19 14:51:01 0.0040 1.8630 11.5779 124.33 LittleGreenCar 0.1386 1.6720 11.0511 120.29
25 14:58:15 -0.0541 1.8581 11.5149 119.13 BlackChevyTruck 0.2910 3.1200 16.9719 93.72
30 15:03:03 -0.1400 1.9219 11.5000 125.67 Black5thGenZL1 0.3480 2.1209 12.0720 121.57
92 16:10:49 0.2859 1.9322 11.5480 124.61 BlackMustang 0.1621 1.9959 12.5230 113.58
97 16:15:19 0.4849 1.9042 11.7759 122.35 RedMazdaHatch 0.6060 2.1220 13.0839 110.02
103 16:20:35 0.3452 1.9388 11.8179 123.22 RedMazdaHatch 0.5370 2.1721 13.8550 74.47
[Lessons Learned]
1. Try to break the tires free on launch for short, slow wheel spin to hook 2500-3500 RPM.
2. Only use line-lock for 1st pass in temps below 55 F and only for a couple seconds.
3. If forced to use left lane, take care to line up with tire marks behind start gate, not in front. Otherwise, I'll be out of the groove to the right and spin wildly.
4. Pedal it if tires break free in 2nd gear but only enough to hook.
5. Watch tach closely for each shift - aim between 6500-6600 RPM.
6. Shift quickly and smoothly. More pulling force in 2nd & 4th. Just heel of palm for 3rd.
Time Slips 1-4
Time Slips 5-6
=============================================
20180304 CPD Pass 01 of 06 6th Gen ZL1 vs Little Green Car
20180304 Coastal Plains Dragway
Weather: Sunny, 52°F, wind N 13 mph (head wind), 43% humidity, barometer 30.14 in hg, DA -624 ft
Time Slip Data:
Code:
2017 6th Gen Camaro ZL1 Opposing Lane
Seq Time R/T 60 ft ET MPH Opposing Car R/T 60 ft ET MPH
19 14:51:01 0.0040 1.8630 11.5779 124.33 LittleGreenCar 0.1386 1.6720 11.0511 120.29
Notes:
25.8" Hoosier DOT Slicks
Right Lane
2-sec Line-Lock burnout w/ rollout
Forgot to turn off nannies
Idle @ 2200 RPM
Launch @ 4000 RPM - Bogged
Dropped to 1000 RPM @ 10 MPH
Momentary wheel slip 1800-1600 RPM
Hooked @ 1600 RPM, 16 (15) MPH
Shift 2nd @ 6400 RPM, 60 (57) MPH
Engine RPM occilated 3 times between 4200-5000 RPM (lost 4-5 10ths)
Shift 3rd @ 6400 RPM, 86 (82) MPH
Shift 4th @ 6600 RPM, 117 (111) MPH
Finish @ 6250 RPM, 134 (127) MPH
# Shorter tires: (subtract 5% speedo error)
Stability control stayed on (nannies) while WOT but didn't intervene (PTM mode Race)
##!! Wow! Engine issues in 2nd gear and slow shift to 4th and still finished with ET of 11.5779
Combined Helmet/PDR/Rooftop Video:
=============================================
=============================================
20180304 CPD Pass 02 of 06 6th Gen ZL1 vs Black Chevy Truck
20180304 Coastal Plains Dragway
Weather: Sunny, 52°F, wind N 13 mph (head wind), 43% humidity, barometer 30.14 in hg, DA -624 ft
Time Slip Data:
Code:
2017 6th Gen Camaro ZL1 Opposing Lane
Seq Time R/T 60 ft ET MPH Opposing Car R/T 60 ft ET MPH
25 14:58:15 -0.0541 1.8581 11.5149 119.13 BlackChevyTruck 0.2910 3.1200 16.9719 93.72
Notes:
25.8" Hoosier DOT Slicks
Ritht Lane
Rolling burnout
Idle @ 3000 RPM
Launch @ 3700 RPM
Dropped to 1100 RPM
Wheel slip 1100-2300
Hooked @ 2300 RPM, 23 (22) MPH
Shift 2nd @ 6600 RPM, 61 (58) MPH
Shift 3rd @ 6500 RPM, 83 (79) MPH
Shift 4th @ 6500 RPM, 117 (111) MPH
Missed shift to 4th - in gear @ 5500 RPM
Finish @ 6000 RPM, 129 (123) MPH
# Shorter tires: (subtract 5% speedo error)
##!! Incredible! Missed 4th and still finished with ET of 11.5149
Combined Helmet/PDR/Rooftop Video:
=============================================
=============================================
20180304 CPD Pass 03 of 06 6th Gen ZL1 vs Black 5th Gen ZL1
20180304 Coastal Plains Dragway
Weather: Sunny, 52°F, wind N 13 mph (head wind), 43% humidity, barometer 30.14 in hg, DA -624 ft
Time Slip Data:
Code:
2017 6th Gen Camaro ZL1 Opposing Lane
Seq Time R/T 60 ft ET MPH Opposing Car R/T 60 ft ET MPH
30 15:03:03 -0.1400 1.9219 11.5000 125.67 Black5thGenZL1 0.3480 2.1209 12.0720 121.57
Notes:
25.8" Hoosier DOT Slicks
Right Lane
Rolling burnout
Idle @ 3600 RPM
Launch @ 3800 RPM
Red Light
Drop to 800 @ 8 MPH
Slight wheel slip 1500-1200-2000 RPM
Hooked at 2000 RPM 20 (19) MPH
Shift 2nd @ 6500 RPM, 63 (60) MPH
Short Shift 3rd @ 6100 RPM, 82 (78) MPH
Shift 4th @ 6500 RPM, 108 (103) MPH
Finish @ 6300 RPM, 136 (129) MPH
Momentary engine RPM oscilation between 6200-6300 RPM in 4th gear WOT just before slowing down.
# Shorter tires: (subtract 5% speedo error)
##!! Even with slight bog and short-shifting 3rd, still finished with ET of 11.5000
Combined Helmet/PDR/Rooftop Video:
=============================================
=============================================
20180304 CPD Pass 04 of 06 6th Gen ZL1 vs Black Mustang
20180304 Coastal Plains Dragway
Weather: Sunny, 52°F, wind N 12 mph (head wind), 40% humidity, barometer 30.13 in hg, DA -541 ft
Time Slip Data:
Code:
2017 6th Gen Camaro ZL1 Opposing Lane
Seq Time R/T 60 ft ET MPH Opposing Car R/T 60 ft ET MPH
92 16:10:49 0.2859 1.9322 11.5480 124.61 BlackMustang 0.1621 1.9959 12.5230 113.58
Notes:
25.8" Hoosier DOT Slicks
Right Lane
Rolling burnout - tires bouncing
Idle @ 2800 RPM
Launch @ 3500 RPM
Drop to 800 RPM, 8 MPH
Slight wheel slip btwn 800-1700 RPM
Hooked @ 1700 RPM, 17 (16) MPH
Shift 2nd @ 6500 RPM, 62 (59) MPH
Slight wheel slip on shift to 2nd
Shift 3rd @ 6500 RPM, 87 (83) MPH
Shift 4th @ 6300 RPM, 112 (106) MPH
Finish @ 6300 RPM, 135 (128) MPH
# Shorter tires: (subtract 5% speedo error)
Combined Helmet/PDR/Rooftop Video:
=============================================
=============================================
20180304 CPD Pass 05 of 06 6th Gen ZL1 vs Red Mazda Hatch
20180304 Coastal Plains Dragway
Weather: Sunny, 52°F, wind N 12 mph (head wind), 40% humidity, barometer 30.13 in hg, DA -541 ft
Time Slip Data:
Code:
2017 6th Gen Camaro ZL1 Opposing Lane
Seq Time R/T 60 ft ET MPH Opposing Car R/T 60 ft ET MPH
97 16:15:19 0.4849 1.9042 11.7759 122.35 RedMazdaHatch 0.6060 2.1220 13.0839 110.02
Notes:
25.8" Hoosier DOT Slicks
Left Lane
Rolling burnout
Idle @ 4000 RPM
Launch @ 3700 RPM
Dropped to 1200 RPM, 12 MPH
Spun wildly beginning at 3500 RPM - Never hooked
Shift 2nd while spinning
Hooked @ 5300 RPM, 70 MPH after momentary wheel spin
Shift 3rd @ 6500 RPM, 87 (83) MPH
Shift 4th @ 6600 RPM, 117 (111) MPH
Finish @ 6200 RPM, 135 (128) MPH
Should have let out throttle when wheels kept spinning before shift to 2nd
# Shorter tires: (subtract 5% speedo error)
From helmet cam it looks like I didn't center on the groove. Tracks beyond start don't line up with tracks before the gate. Left lane mostly narrow track vehicles.
Next time in left lane, note where tracks are before burnout or just stay in right lane.
Combined Helmet/PDR/Rooftop Video:
=============================================
=============================================
20180304 CPD Pass 06 of 06 6th Gen ZL1 vs Red Mazda Hatch
20180304 Coastal Plains Dragway
Weather: Sunny, 55°F, wind N 12 mph (head wind), 37% humidity, barometer 30.12 in hg, DA -404 ft
Time Slip Data:
Code:
2017 6th Gen Camaro ZL1 Opposing Lane
Seq Time R/T 60 ft ET MPH Opposing Car R/T 60 ft ET MPH
103 16:20:35 0.3452 1.9388 11.8179 123.22 RedMazdaHatch 0.5370 2.1721 13.8550 74.47
Notes:
25.8" Hoosier DOT Slicks
Right Lane
Rolling burnout - wheels bouncing
Idle @ 3800 RPM
Launch @ 4000 RPM
Dropped to 800 RPM
Intermittent wheel spin btwn 800-1600 RPM
Hooked @ 1600 RPM, 16 MPH
Shift 2nd @ 6500 RPM, 61 MPH
wheel spin 1/4 sec at 5500 RPM
peddalled throttle
Hooked again at 4800 RPM
Short Shift 3rd @ 6000 RPM, 81 MPH
Shift 4th @ 6400 RPM, 113 MPH
Finish @ 6200 RPM, 133 MPH
Lots of wheel spin and short shifting
Should have added fuel for weight on this 2nd session
Combined Helmet/PDR/Rooftop Video:
=============================================