[Z06] C6Z06--New Best Bone Stock on Stock Tires 11.17 125.94
11-03-2007, 09:20 PM
#1
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C6Z06--New Best Bone Stock on Stock Tires 11.17 125.94
Been away from the Forum the past several weeks focused on other things. But I'd been missing my racing buddies and badly needing the diversion of serious seat-time in the Z06. A quick check of the weather forecast for Maryland International Raceway revealed generally favorable conditions; and that prompted a short-notice plan to make a few passes at today’s test and tune with five other CF members, including dgdoc, Steve Row, DickL, Jamie Furman, and Isaiah48.
The weather was pleasant, high-50s to low-60s, low humidity, and a decent barometer of about 29.65. A variable cross-wind was present throughout the day but had no effect on the performance of the car. Track surface temperature was 58-73 degrees; and the track preparation was very good, pretty much standard race day conditions for MIR.
Chose to run stock tires, focused on finding the natural lower-limit I'd estimated 18 months ago for a bone-stock C6Z, 11.15 or so.
After two initial passes that were within one-hundredth on every split, I knew my driving was at least consistent and would accommodate technique adjustments. The issue was the launch was bogging, even using a 3600 launch rpm.
So on the 3d pass, I focused on keeping everything the same except speeding up the throttle squeeze. That really meant launching the stock tires using the same throttle squeeze I employ with drag radials. I used my standard three-element launch and got the throttle to the floor very quickly, by about 10-12 feet of forward movement, rather than the usual 20-30. That single adjustment improved the 60’ and 330’ by enough to generate a new personal best. Of special interest, the 330’-1320’ incremental on that pass was 6.37, identical to the first two passes. Again ideal shift points and fast shift speeds pay a big dividend on this car.
Splits on the pass were:
60'........1.750
330'......4.806
660'......7.279 99.80
1000'.....9.390
1320'....11.177 125.94
DA at the time was 650 feet.
Again for the record, my car is bone stock. Stock tires. No mods at all. Original PCM that’s never been modified. As always, I ran with fuel load at half-tank, in this case Exxon 93 octane, standard pump gas in Maryland. Floor mats in place and 20 pounds of miscellaneous junk in the car. Odometer is just short of 13K miles.
My usual cameraman man wasn’t available on short notice; so no vid of this pass. But I've included the time slip, certified by a tower official, the entry card, tech inspection sticker, and racer bracelet. Plus, I suspect the several Forum member eye witnesses will post their observations once they find this thread.
Best to all,
Ranger
The weather was pleasant, high-50s to low-60s, low humidity, and a decent barometer of about 29.65. A variable cross-wind was present throughout the day but had no effect on the performance of the car. Track surface temperature was 58-73 degrees; and the track preparation was very good, pretty much standard race day conditions for MIR.
Chose to run stock tires, focused on finding the natural lower-limit I'd estimated 18 months ago for a bone-stock C6Z, 11.15 or so.
After two initial passes that were within one-hundredth on every split, I knew my driving was at least consistent and would accommodate technique adjustments. The issue was the launch was bogging, even using a 3600 launch rpm.
So on the 3d pass, I focused on keeping everything the same except speeding up the throttle squeeze. That really meant launching the stock tires using the same throttle squeeze I employ with drag radials. I used my standard three-element launch and got the throttle to the floor very quickly, by about 10-12 feet of forward movement, rather than the usual 20-30. That single adjustment improved the 60’ and 330’ by enough to generate a new personal best. Of special interest, the 330’-1320’ incremental on that pass was 6.37, identical to the first two passes. Again ideal shift points and fast shift speeds pay a big dividend on this car.
Splits on the pass were:
60'........1.750
330'......4.806
660'......7.279 99.80
1000'.....9.390
1320'....11.177 125.94
DA at the time was 650 feet.
Again for the record, my car is bone stock. Stock tires. No mods at all. Original PCM that’s never been modified. As always, I ran with fuel load at half-tank, in this case Exxon 93 octane, standard pump gas in Maryland. Floor mats in place and 20 pounds of miscellaneous junk in the car. Odometer is just short of 13K miles.
My usual cameraman man wasn’t available on short notice; so no vid of this pass. But I've included the time slip, certified by a tower official, the entry card, tech inspection sticker, and racer bracelet. Plus, I suspect the several Forum member eye witnesses will post their observations once they find this thread.
Best to all,
Ranger
Last edited by Ranger; 11-13-2007 at 12:42 PM.
11-03-2007, 09:36 PM
#5
Damn, you are amazing, my friend.
I'm glad the DA wasn't minus 20,000 feet..........LOL.
I'm glad the DA wasn't minus 20,000 feet..........LOL.
11-03-2007, 09:44 PM
#6
Been focused on other things the past several weeks and have been away from the Forum. But I was missing my racing buddies and badly needed the diversion always brought by some serious seat-time in the Z06. A quick check of the weather forecast for Maryland International Raceway revealed generally favorable conditions. That prompted a short-notice plan to make a few passes at today’s test and tune with five other CF members, including dgdoc, Steve Row, DickL, Jamie Furman, and one whose screen-name escapes me at the moment.
The weather was pleasant, high-50s to low-60s, low humidity, and a decent barometer of about 29.65. A variable cross-wind was present but had no effect on the performance of the car. Track surface temperature was 58F-73F. Track prep was very good.
I chose to run stock tires with aspirations of approaching the natural lower-limit I had estimated for a bone-stock C6Z 18 months ago, 11.15 or so.
After two initial passes that were within one-hundredth on every split, I knew my driving was at least consistent and would be responsive to technique adjustments. The issue was that my launch was bogging, even using a 3600 launch rpm.
So on the 3d pass, I focused on keeping everything the same except speeding up the throttle squeeze. That really meant launching the stock tires using the same techniques I employ with drag radials. I used my standard three-element launch and got the throttle to the floor by about 10-12 feet of forward movement, rather than 20-30. That one adjustment improved the 60’ and 330’ by enough to generate a new personal best. Of interest, the 330’-1320’ incremental on that pass was 6.37, identical to the first two passes. Again consistent shift points and shift speeds tell a story.
Splits on this pass were:
60'........1.750
330'......4.806
660'......7.279 99.80
1000'.....9.390
1320'....11.177 125.94
DA at the time was 650 feet.
Again for the record, my car is bone stock. No mods at all. Original PCM that’s never been modified. Stock tires. As always, I ran with half-tank of fuel, in this case Exxon 93 octane, standard pump gas in Maryland. Floor mats in place and 20 pounds of miscellaneous junk in the car.
My usual video man wasn’t available; so no vid of this pass. But there is a certified time slip and several eye witness members who I suspect will post their observations.
Best to all,
Ranger
The weather was pleasant, high-50s to low-60s, low humidity, and a decent barometer of about 29.65. A variable cross-wind was present but had no effect on the performance of the car. Track surface temperature was 58F-73F. Track prep was very good.
I chose to run stock tires with aspirations of approaching the natural lower-limit I had estimated for a bone-stock C6Z 18 months ago, 11.15 or so.
After two initial passes that were within one-hundredth on every split, I knew my driving was at least consistent and would be responsive to technique adjustments. The issue was that my launch was bogging, even using a 3600 launch rpm.
So on the 3d pass, I focused on keeping everything the same except speeding up the throttle squeeze. That really meant launching the stock tires using the same techniques I employ with drag radials. I used my standard three-element launch and got the throttle to the floor by about 10-12 feet of forward movement, rather than 20-30. That one adjustment improved the 60’ and 330’ by enough to generate a new personal best. Of interest, the 330’-1320’ incremental on that pass was 6.37, identical to the first two passes. Again consistent shift points and shift speeds tell a story.
Splits on this pass were:
60'........1.750
330'......4.806
660'......7.279 99.80
1000'.....9.390
1320'....11.177 125.94
DA at the time was 650 feet.
Again for the record, my car is bone stock. No mods at all. Original PCM that’s never been modified. Stock tires. As always, I ran with half-tank of fuel, in this case Exxon 93 octane, standard pump gas in Maryland. Floor mats in place and 20 pounds of miscellaneous junk in the car.
My usual video man wasn’t available; so no vid of this pass. But there is a certified time slip and several eye witness members who I suspect will post their observations.
Best to all,
Ranger
Great pass John. Absolutely fantastic.
11.177 @125.94 bone stock on stock rubber is going to be tough to beat.
Last edited by '06 Quicksilver Z06; 11-03-2007 at 10:17 PM.
11-03-2007, 10:52 PM
#8
Melting Slicks
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Ranger,
Congrats on your new best!! Also, congrats on part 2 of the interview Corvette Fever did on your driving style.
My next Z will be bone stock and have made myself a promise not to mod until I maximize what Chevy gave us.
Pio
PS - do you think the LS7 is getting stronger with more miles? A lot of folks believe they get stronger as the miles roll up. What do you think?
Congrats on your new best!! Also, congrats on part 2 of the interview Corvette Fever did on your driving style.
My next Z will be bone stock and have made myself a promise not to mod until I maximize what Chevy gave us.
Pio
PS - do you think the LS7 is getting stronger with more miles? A lot of folks believe they get stronger as the miles roll up. What do you think?
Last edited by Pio; 11-03-2007 at 10:56 PM.
11-03-2007, 10:56 PM
#10
Drifting
Great driving!
Lets see 10.99, come on you can do it
Man you're making the car look seriously awesome - You should join GM and be a test driver or something!
Congrats on the new personal best!
11-04-2007, 02:48 AM
#14
Drifting
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"The Man" proves the Z06 can - once again - beat or exceed many car's "wet dreams" of performance and reliability.
WOW!!
You Sir, should be on the GM payroll for R&D and development and testing!!
Sheesh!
Well, that should boost your DVD sales, a bit! LOL J/K my man!
Sooo- whats the latest forecast for the DVD availability?
American Pride Lives On!!
WOW!!
You Sir, should be on the GM payroll for R&D and development and testing!!
Sheesh!
Well, that should boost your DVD sales, a bit! LOL J/K my man!
Sooo- whats the latest forecast for the DVD availability?
American Pride Lives On!!
11-04-2007, 05:09 AM
#15
Burning Brakes
Congrat's
Now when are you going to the Nurburgring to knock down that record? haha. I am sure you could do it given enough time!
Who is game for the, "Send Ranger to Germany and Bust the N-Ring Record" Charity? We will have Ranger go over there, live for 6 months off of nothing but bread, cheese, and good German Ale, learning the track somewhere along the way!
Seriously though, keep it up.
Now when are you going to the Nurburgring to knock down that record? haha. I am sure you could do it given enough time!
Who is game for the, "Send Ranger to Germany and Bust the N-Ring Record" Charity? We will have Ranger go over there, live for 6 months off of nothing but bread, cheese, and good German Ale, learning the track somewhere along the way!
Seriously though, keep it up.
11-04-2007, 06:34 AM
#16
Safety Car
Nice Run!
I have noticed your best times seem to be in 50-60 and even 70 degree type weather.
Lots of people feel you would do better on a negative DA day, but I think the traction disadvantage from more power and less track bite on that type day would slow you down.
What do you think?
I have noticed my best times in manual tranny high powered cars came on cool and pleasant days, I slowed down on colder negative-DA days.
I have only went faster in less traction limited automatics on those negative DA type of days.
I know if and when I decide to run this beast, I will first attempt it on a pleasant day.
I want all the traction I can get.
Congrats again on a GREAT RUN!!!!
Howard
I have noticed your best times seem to be in 50-60 and even 70 degree type weather.
Lots of people feel you would do better on a negative DA day, but I think the traction disadvantage from more power and less track bite on that type day would slow you down.
What do you think?
I have noticed my best times in manual tranny high powered cars came on cool and pleasant days, I slowed down on colder negative-DA days.
I have only went faster in less traction limited automatics on those negative DA type of days.
I know if and when I decide to run this beast, I will first attempt it on a pleasant day.
I want all the traction I can get.
Congrats again on a GREAT RUN!!!!
Howard
11-04-2007, 07:24 AM
#17
ZR1TG
Congrats Ranger !
glad to hear you are still at it !!
hardhattg
glad to hear you are still at it !!
hardhattg
11-04-2007, 08:10 AM
#19
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Thanks for the kind words sent my way.
Just short of 13K. I've not sensed any power increase as the car has accumulated miles. What has definitely improved is the driver-car interface. So seat time and attention to correct techniques are amply rewarded.
Excellent point, Foosh.
Thanks. That was pretty much a perfect pass in those conditions. Were the barometer more cooperative, say 30.20 instead of the 29.65 we had, a faster ET would be possible. Someone may have the opportunity to run in those better conditions and capitalize on them.
Thanks, Pio. That article is worth reading; it's comprehensive but still compact in just four pages. Lot of insights that haven't made it to the web yet.
I don't thinks so Robert and 02HREBlue, but under ideal conditions with that elusive perfect pass, it might make mid-to-high 11.0X. That assumes low humidity (30%) and a high barometer (30.20+); I'm less concerned with the air temperature. And of course being at a well managed track with good surface preparation is a necessary ingredient too.
Not sure the basis of the question. I've never run a 130 trap.
MIR is a great track and the staff takes surface maintenance seriously. The track is scraped every Monday from the water box to the 150' mark. That practice is key to a consistently fast surface. But, of course, there are quite a few fast tracks in the country. Atco and Cecil County are two others within an acceptable driving range of my home.
I did a burnout of the stock tires to first smoke and launched at 3600 (same as DRs). Rears were freshly set to 25.5 psi. Very fast clutch release and extremely fast throttle squeeze.
You bring up an interesting point with a complicated answer.
Density altitude is a calculation that factors in the air temp, humidity and barometric pressure. And extremely low DAs often occur at very low temperatures. I measure the track surface temp and stop making passes when it reaches about 45 degrees. But above that temp, a properly heated rear tire (free of water) will still hook reliably. And that includes the stock C6Z tires. If instead the rears are cold too, they will definitely show compromised traction below a track surface temp of 60 degrees. Sun load can have a very positive benefit on a cold day. Full sun is best and can bring a surface temp 20-25 degrees higher than the air temp.
Ranger
Just short of 13K. I've not sensed any power increase as the car has accumulated miles. What has definitely improved is the driver-car interface. So seat time and attention to correct techniques are amply rewarded.
Excellent point, Foosh.
MIR is a great track and the staff takes surface maintenance seriously. The track is scraped every Monday from the water box to the 150' mark. That practice is key to a consistently fast surface. But, of course, there are quite a few fast tracks in the country. Atco and Cecil County are two others within an acceptable driving range of my home.
I did a burnout of the stock tires to first smoke and launched at 3600 (same as DRs). Rears were freshly set to 25.5 psi. Very fast clutch release and extremely fast throttle squeeze.
...I have noticed your best times seem to be in 50-60 and even 70 degree type weather.
Lots of people feel you would do better on a negative DA day, but I think the traction disadvantage from more power and less track bite on that type day would slow you down.
What do you think?
Lots of people feel you would do better on a negative DA day, but I think the traction disadvantage from more power and less track bite on that type day would slow you down.
What do you think?
Density altitude is a calculation that factors in the air temp, humidity and barometric pressure. And extremely low DAs often occur at very low temperatures. I measure the track surface temp and stop making passes when it reaches about 45 degrees. But above that temp, a properly heated rear tire (free of water) will still hook reliably. And that includes the stock C6Z tires. If instead the rears are cold too, they will definitely show compromised traction below a track surface temp of 60 degrees. Sun load can have a very positive benefit on a cold day. Full sun is best and can bring a surface temp 20-25 degrees higher than the air temp.
Ranger
Last edited by Ranger; 11-04-2007 at 08:12 AM.
