C6 1/4 Mile Performance Challenge
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by mcv
Just ran another SuperCharged 560 Corvette at Lebanon Valley Dragway.
This time, a convertible with auto trans.
We only got three runs in at a very crowded Wednesday night session. Results of the third pass: 11.582 sec @ 122.78 mph.
Car Details:
2006 Convertible w/6 speed auto trans.
Callaway SuperCharged Package
Stock LS2, prototype Honker/Magna Charger intake/Double-D exhaust.
Stock exhaust manifolds and catalytic converters.
Callaway PCM recalibration.
Drag radials.
The time slip:
This time, a convertible with auto trans.
We only got three runs in at a very crowded Wednesday night session. Results of the third pass: 11.582 sec @ 122.78 mph.
Car Details:
2006 Convertible w/6 speed auto trans.
Callaway SuperCharged Package
Stock LS2, prototype Honker/Magna Charger intake/Double-D exhaust.
Stock exhaust manifolds and catalytic converters.
Callaway PCM recalibration.
Drag radials.
The time slip:
Mine is also on my A6. 1.8's is C5 territory.
These A6 tranny's should be faster off the line.
Last edited by shurite44; Oct 2, 2006 at 07:48 PM.
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Originally Posted by shurite44
Why do you think your 60's are so slow??
Mine are also on my A6. 1.8's is C5 territory.
These A6 tranny's should be faster off the line.
Mine are also on my A6. 1.8's is C5 territory.
These A6 tranny's should be faster off the line.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Originally Posted by shurite44
Why do you think your 60's are so slow??
Cruising
Joined: Sep 2006
Posts: 11
Likes: 0
From: Coral Springs FL
Moroso Last night!
Tack Temp about 78
06 3LT Z51 6A
Both AH and TC Off
Left tranny in S but let it shift
Launched @ 2000
Coolant Temp @ 218
60' ... 2.076
330 .. 5.750
1/8 ... 8.676
MPH ... 84.69
1000 ... 11.176
1/4 ... 13.267 @ 108.59
Is there something wrong with my car? I have 1500 miles on it! This was my best run of the night! I used to pull 13.0's with my 00 Z28!
Tack Temp about 78
06 3LT Z51 6A
Both AH and TC Off
Left tranny in S but let it shift
Launched @ 2000
Coolant Temp @ 218
60' ... 2.076
330 .. 5.750
1/8 ... 8.676
MPH ... 84.69
1000 ... 11.176
1/4 ... 13.267 @ 108.59
Is there something wrong with my car? I have 1500 miles on it! This was my best run of the night! I used to pull 13.0's with my 00 Z28!
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by sfadchi
Moroso Last night!
Tack Temp about 78
06 3LT Z51 6A
Both AH and TC Off
Left tranny in S but let it shift
Launched @ 2000
Coolant Temp @ 218
60' ... 2.076
330 .. 5.750
1/8 ... 8.676
MPH ... 84.69
1000 ... 11.176
1/4 ... 13.267 @ 108.59
Is there something wrong with my car? I have 1500 miles on it! This was my best run of the night! I used to pull 13.0's with my 00 Z28!
Tack Temp about 78
06 3LT Z51 6A
Both AH and TC Off
Left tranny in S but let it shift
Launched @ 2000
Coolant Temp @ 218
60' ... 2.076
330 .. 5.750
1/8 ... 8.676
MPH ... 84.69
1000 ... 11.176
1/4 ... 13.267 @ 108.59
Is there something wrong with my car? I have 1500 miles on it! This was my best run of the night! I used to pull 13.0's with my 00 Z28!
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Originally Posted by sfadchi
Moroso Last night!
Coolant Temp @ 218
1/4 ... 13.267 @ 108.59
Is there something wrong with my car?
Coolant Temp @ 218
1/4 ... 13.267 @ 108.59
Is there something wrong with my car?
So at 218F coolant temp you may have been hit with triple whammy.
There are guys here who assert that engine temps have no ill-effect on their ETs. I'd suggest they are keeping a detailed log book, or else they wouldn't say that.
Ranger
Tech Contributor
Joined: Jul 2002
Posts: 14,950
Likes: 264
From: St. Louis, MO
St. Jude Donor '08
Originally Posted by sfadchi
Moroso Last night!
Tack Temp about 78
06 3LT Z51 6A
Both AH and TC Off
Left tranny in S but let it shift
Launched @ 2000
Coolant Temp @ 218
60' ... 2.076
330 .. 5.750
1/8 ... 8.676
MPH ... 84.69
1000 ... 11.176
1/4 ... 13.267 @ 108.59
Is there something wrong with my car? I have 1500 miles on it! This was my best run of the night! I used to pull 13.0's with my 00 Z28!
Tack Temp about 78
06 3LT Z51 6A
Both AH and TC Off
Left tranny in S but let it shift
Launched @ 2000
Coolant Temp @ 218
60' ... 2.076
330 .. 5.750
1/8 ... 8.676
MPH ... 84.69
1000 ... 11.176
1/4 ... 13.267 @ 108.59
Is there something wrong with my car? I have 1500 miles on it! This was my best run of the night! I used to pull 13.0's with my 00 Z28!
I can't help you launch a A6, but here is an opportunity to practice and get it down. My first Test Day, along with Ranger's threads, dropped my et by about .4 with my C5, all in learning how to launch (as per my spreadsheet I now keep).
http://forums.corvetteforum.com/show....php?t=1493900
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Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Just an additional point, by managing engine temps, I can still run with a 190 coolant temp and cool cats when the air temp is mid-high 80s and the DA is 2500+ feet. The DA will affect power but not nearly as much as seeing 12-14 degrees of timing pulled by the ECU/PCM at high engine temps.
Ranger
Ranger
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Originally Posted by sfadchi
I'm sure it's a ignorant question, but what does DA stand for?
For racers, DA is a measure of how well the air will produce horsepower. The lower the number the better. DA is computed in a formula using the following variables:
(1) air temperature
(2) humidity
(3) air pressure
To be relatively indicative, those variable should be measured at the track not on a radio report from a nearby city or on the www by Accu-weather. Racers often use a hand-held weather station to automatically compute the density altitude at race time.
Ranger
Race Director
Joined: Feb 2006
Posts: 11,733
Likes: 15
From: SC
I'll add the following bit of info regarding heatsoak. 1st time at the track with the 05 GTO, hot lapping resulted in 102mph traps and mid-high 13's. I was DISMAYED at a 400hp car trapping 102, especially with the air in the 50's. 2nd time at the track with 45min cooldown 105 trap, a 2 hr cooldown and then the 1st person in staging lanes (nearly no idle time) 107mph trap, all with air temp in the mid 80's.
The stock tune GM gave the LS2 is a joke.
The LS2 will lose an easy 40+hp due to running hot.
The stock tune GM gave the LS2 is a joke.
The LS2 will lose an easy 40+hp due to running hot.
Race Director
Joined: May 2001
Posts: 15,324
Likes: 2,080
From: Guelph, Ontario
Originally Posted by Ranger
To be relatively indicative, those variable should be measured at the track not on a radio report from a nearby city or on the www by Accu-weather. Racers often use a hand-held weather station to automatically compute the density altitude at race time.
http://www.modulardepot.com/density.php
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by Ranger
Far from ignorant. Pilots and drag racers want to know about Density altitude. Pilot need it to calculate max load of their aircraft at take-off.
For racers, DA is a measure of how well the air will produce horsepower. The lower the number the better. DA is computed in a formula using the following variables:
(1) air temperature
(2) humidity
(3) air pressure
For racers, DA is a measure of how well the air will produce horsepower. The lower the number the better. DA is computed in a formula using the following variables:
(1) air temperature
(2) humidity
(3) air pressure
Alititude
Le Mans Master
Joined: Sep 2004
Posts: 7,027
Likes: 6
From: Shiloh Ohio
Originally Posted by glennhl
Don't forget one of the more important factors in calculating DA:
Alititude
Alititude
Of course like many math equations track elev could become a variable if you go to a different track.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by shurite44
Not to be picky but he said variables. Track elev would be a constant. Of course like many math equations track elev could become a variable if you go to a different track.
Of course like many math equations track elev could become a variable if you go to a different track.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Originally Posted by glennhl
I have to politely disagree. The altitude or elevation of the track is one of the variables that is plugged into the equation to determine density altitude. Without that variable you can not determine the DA. Think of it this way, it's only a variable because all the racetracks are at different (variable) altitudes.
And it's not enough to just have the weather station at the track in or on top of your car but one should actually be holding it near or right at ground level when you read it.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by LS1LT1
True, but I think what Ranger was trying to say (and maybe why physical track altitude was omitted from his list of variables) was that the only way to determine a true DA reading is while you're actually at your particular track using a properly functioning and accurate handheld weather station. The reading will have already factored the physical altitude into it so it might seem redundant to mention it as a variable at that point (though in reality it is of course).
And it's not enough to just have the weather station at the track in or on top of your car but one should actually be holding it near or right at ground level when you read it.
And it's not enough to just have the weather station at the track in or on top of your car but one should actually be holding it near or right at ground level when you read it.
