CorvetteForum - Chevrolet Corvette Forum Discussion - Z06 Bone-Stock C6Z06 on Drag Radials

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.

http://www.rangeracceleration.com/ho..._slip_1074.jpg

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

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Update January 24, 2010
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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