Z06 Bone-Stock C6Z06 on Drag Radials—New Record: 10.74 129.50 - CorvetteForum - Chevrolet Corvette Forum Discussion



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Bone-Stock C6Z06 on Drag Radials—New Record: 10.74 129.50

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Old 12-16-2009, 10:53 PM   #1
Ranger
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Default Bone-Stock C6Z06 on Drag Radials—New Record: 10.74 129.50

Back in November 2006 after first running 10.85 on drag radials in a bone-stock C6Z06, I opined that 10.7X was possible under the right conditions. Today, I had my first opportunity to run in really good air on my home track, Maryland International Raceway in Budds Creek. DA at the time was negative-1300 feet.

My series was
10.85 129.21 1.67
10.87 130.09 1.67
10.81 130.39 1.67
Then
10.74 129.50 1.59


Here is the video. It plays at youtube in HD full-screen



Here is the certified time slip.




I’ve hosted three rentals this fall and gotten my driving in pretty good shape. That track time, combined with frequent practice sessions of shifting drills and garage launch routines, have helped me internalize techniques that work, at least for me. My 60’ on DRs are now routinely in the 1.6X and stray occasionally to the low end of that range. Today was my first in the 1.5s, perhaps a fitting cap to the racing season.

After the 10.74 on Drs, I made some passes on the stock tires, but the racing surface was getting too cold to support a good launch and 1-2 shift on stock GY F1SC-EMTs

My four stock tire passes were:

11.10 127.76 1.79
11.12 128.89 1.88
11.14 127.65 1.80
11.18 129.01 1.89

My car is a bone stock 2006 Z06, built in Feb 2006, with 21K miles and more than 200 drag strip passes. Nothing whatsoever has been changed on the car from factory spec. Couple forum members witnessed my passes today and inspected my car. Perhaps they will post-up.

DRs on the car were BFG 315.35.17 on 17"x12" CCWs. The 10.74 was the 72d burnout/pass on this pair of drag radials and they still have life left in them.

There were six other racers with me at MIR today and all set PRs. Good driving in great conditions makes for happy memories. I suspect several of them will be starting threads on their respective boards.

Sorry to say I’ll be off-the-grid traveling for a while starting Thursday morning; so I will be late in responding to specific questions. I'll try to get the video posted before departing.

Best to all. Merry Christmas.

Ranger

--------------------------------
Update January 24, 2010
--------------------------------
I’m just back. Will start working my way through the queue of PMs that’s accumulated. Sorry for the delay in responding to those questions and the ones posted in this thread.

My drag logbook for this stock 2006 Z06 stands at 236 passes of which about 175 are on HD video.

Swapped the original clutch for a new stock LS7 clutch/PP/FW after 166 passes. Inspection showed the original still had a fair amount of life left. The current LS7 clutch now has 70 passes and is performing fine. Just must remain within the limitations of its finicky personality and keep the clutch fluid fresh and clean.

Regarding the 10.74 pass, analysis of the data I collected shows:

Stage. I put the car’s front wheels about 1.5 inches deeper than ideal. That adversely affected ET by about .045 seconds and trap by less than 1.0 mph. I know better than to make that mistake. But it is there on film.

Launch. Got the clutch out fast at 3600 rpm. On the in-car audio Torque Management can be heard attenuating power slightly. That helped limit wheel spin to just a touch immediately before the clutch locked up at 2900 rpm (about 21 mph). Throttle was on the floor right after that at about 12 feet of forward movement. The car’s nose stayed up from launch all the way through first gear. That is difficult to achieve unless the clutch and throttle are synchronized correctly. But this gave a 60’ of 1.59 and a 60’-330’ incremental of 2.93, both are PRs.

Shifts. Measured shift times were less than .250 seconds on the 1-2 and less than .220 on the 2-3. The 3-4 was about .270. Momentary invocation of Torque Management can be heard on the 1-2 shift. That helped minimize wheel spin.

Shift points were good, right before 7K. My foot came off the throttle peddle fully on each shift, in other words, no power shifting. That, coupled with a consistently very fast clutch pedal cycle time, gave shift completion without clipping the rev-limiter before or during the shifts. The 330’-660’ incremental, which includes the 2-3 shift, was 2.40. That’s a PR for me. The 330’-1320’ incremental was 6.20, also a PR.

Couple members posted that my shifts seemed slow. They might want to consider the wind direction shown by the pennants on the outside wall of the right lane. Pennants show the wind blowing straight across the lane, thereby carrying the sound of the exhaust away from the microphone on the camcorder that captured the video in post-1. Military folks, videographers, and hunters, among others, understand the tricks wind direction plays on sound perceptions.

All in all the 10.74 was a solid pass. A perfect stage would have improved it. If to improve my shift speed further, it will mean more time at the squat rack.

Ranger

Last edited by Ranger; 01-24-2010 at 06:04 PM.
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Old 12-16-2009, 11:02 PM   #2
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GREAT job...
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Old 12-16-2009, 11:05 PM   #3
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awesome accomplishment man
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Old 12-16-2009, 11:06 PM   #4
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congrats! thank you for continuing to push the envelope, you are doing us all some serious justice

what rpm were you launching at with the dr's? thanks!
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Old 12-16-2009, 11:09 PM   #5
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Quote:
Originally Posted by Burnin4 View Post
what rpm were you launching at with the dr's?
Thanks, everyone.

My DR launch is 3600.

Ranger
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Old 12-16-2009, 11:12 PM   #6
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WOW, amazing times Ranger
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Old 12-16-2009, 11:14 PM   #7
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The traps speeds are unreal. I understand hooking with DR's, but damn that's fast. Great driving!
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Old 12-16-2009, 11:15 PM   #8
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Congrats Ranger- wow!

130mph in stock form, d*mn thats movin.


Do you lift when shifting?
Also what package is your car- 1LZ, 2LZ, 3LZ?
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Old 12-16-2009, 11:21 PM   #9
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Congratulations! I'm sure you were having fun!
Awesome times.
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Old 12-16-2009, 11:22 PM   #10
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Congrats John!

And I though my recent 1.600 60' was incredible! You launched about 1000 rpm LOWER then I did to get my 1.600....That's very interesting!

Suffice to say, the conditions AND you're driving were PERFECT on that pass!..Congrats again on an incredible feat!

Ron
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Old 12-16-2009, 11:23 PM   #11
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wow pretty much sums it up.
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Old 12-16-2009, 11:25 PM   #12
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Congrats John.

Absolutely amazing, both the trap speeds and the ETs.

The consistency, speaks volumes.

Your driving had to have been flawless in order to produce results like those.
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Old 12-16-2009, 11:29 PM   #13
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John,
Simply amazing. That's awesome driving. Thank you for all of your help that you have provided unselfishly to ALL. Congrats.
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Old 12-16-2009, 11:34 PM   #14
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Good job John! I finally got a set of DR's, but as fate would have it the weather turned and I have only one day with 3 passes on them. I found launching at 4k was the ticket and stuck a 1.63 60' but of course missed 2nd gear. Hopefully you'll be back in Chicago next season and we can get together again.
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Old 12-16-2009, 11:48 PM   #15
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I can vouch for John. He is one heck of a driver and a great guy. All the hard effort and constant attention to details paid off. Car is 100% bone stock. Was a great day for everyone. Several other PRs set hopefully they will post up.
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Old 12-17-2009, 12:02 AM   #16
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So do you still think there's room for improvement or was that a flawless run?
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Old 12-17-2009, 12:05 AM   #17
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congrats Ranger
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Old 12-17-2009, 12:16 AM   #18
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Quote:
Originally Posted by LEAVINU View Post
...Do you lift when shifting?
Also what package is your car- 1LZ, 2LZ, 3LZ?
No power-shifting for me. Over 700 passes in three Z06s without any tranny issues. Want to keep it that way.

Car is a 2LZ/NAV

Appreciate the kind words from a group of guys whose posts I've enjoyed reading for many years.

Working on the video now.

Ranger
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Old 12-17-2009, 12:20 AM   #19
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Congrats on your pass! I would say I am surprised but when I saw your 60' I was no longer surprised as it is the best I have ever seen from a stock car. Great Run!
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Old 12-17-2009, 12:30 AM   #20
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Congrats John - Absolutely awesome accomplishment.

The numbers are stunning - 10.74, 103 in the 1/8th, 4.53 330'. Three 1.67's in a row?

This only happens through a ton of hard work, testing, analysis, relentless determination, and superb driving skill.

You've made everyone in Corvette-Nation proud.....
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