2012 Coupe v Grand Sport
11-17-2011, 02:15 PM
#1
Racer
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Member Since: Jul 2003
Location: N. Potomac MD
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2012 Coupe v Grand Sport
COUPE
ENGINE
LS3 6.2L V8
TYPE
90-degree pushrod, 16-valve V8, aluminum block
and heads, hydraulic lifters
and heads, hydraulic lifters
BORE AND STROKE
4.06 x 3.62 COMPRESSION RATIO 10.7:1
HORSEPOWER
430 @ 5900 rpm (436 w/dual-mode exhaust)
TORQUE
424 lb.-ft. @ 4600 rpm (428 w/dual-mode exhaust)
REDLINE
6500 rpm AXLE RATIO 3.42:1 manual;
2.56:1 automatic O TO 60 4.2 seconds
2.56:1 automatic O TO 60 4.2 seconds
QUARTER MILE
12.6 seconds @ 115 mph
top speed
190 mph SKID PAD (MAX. LATERAL ACCELERATION) 0.92g
BRAKING SYSTEM
Power-assisted 4-wheel ventilated disc
with BoschR ABS BRAKING DISTANCE 60 to 0 in 116 ft.
with BoschR ABS BRAKING DISTANCE 60 to 0 in 116 ft.
CURB WEIGHT
3,225 lbs.
POWER-TO-WEIGHT
7.5:1 (curb weight/hp)
WEIGHT DISTRIBUTION
51/49 DRAG COEFFICIENT 0.286
EPA-ESTIMATED FUEL ECONOMY
(MPG CITY/HWY) 16/26 manual; 15/25 auto
MAXIMUM HIGHWAY CRUISING RANGE (MANUAL/AUTO) 468/450 miles
GRAND SPORT COUPE
ENGINE
LS3 6.2L V8
TYPE
90-degree pushrod, 16-valve V8, aluminum
block and heads, hydraulic lifters with
dry-sump oil system on manual versions
block and heads, hydraulic lifters with
dry-sump oil system on manual versions
BORE AND STROKE
4.06 x 3.62 COMPRESSION RATIO 10.7:1
HORSEPOWER
430 @ 5900 rpm (436 w/dual-mode exhaust)
TORQUE
424 lb.-ft. @ 4600 rpm (428 w/dual-mode exhaust)
REDLINE
6500 rpm AXLE RATIO 3.42:1 manual;
2.73:1 automatic O TO 60 3.95 seconds
2.73:1 automatic O TO 60 3.95 seconds
QUARTER MILE
12.3 seconds @ 117 mph
SKID PAD
(MAX. LATERAL ACCELERATION) 1.0g
BRAKING SYSTEM
4-wheel ventilated, cross-drilled cast
iron rotors with 6-piston front calipers and 4-piston rear
calipers with Bosch ABS BRAKING DISTANCE 60 to 0 in 113 ft.
iron rotors with 6-piston front calipers and 4-piston rear
calipers with Bosch ABS BRAKING DISTANCE 60 to 0 in 113 ft.
CURB WEIGHT
3,330 lbs.
POWER-TO-WEIGHT
7.7:1 (curb weight/hp)
WEIGHT DISTRIBUTION
51/49 DRAG COEFFICIENT 0.34
EPA-ESTIMATED FUEL ECONOMY
(MPG CITY/HWY) 16/26 manual; 15/25 auto
MAXIMUM HIGHWAY CRUISING RANGE (MANUAL/AUTO) 468/450 miles
So I'm confused if engine and drivetrain are the same and the coupe is 100# less with a lower CD then why would the 0-60 and 1/4 mile times be less. Is it all because of the larger tires? I can understand why the skit pad g's are lower but why the rest? Poorer start on smaller tires?
11-17-2011, 02:43 PM
#2
Melting Slicks
This has been debated since the GS came out and for full disclosure I own an '11 GS coupe. Many will say it is advertising hype and in fact, the base coupe is superior due to the factors you cite. And, for the most part, I agree the coupe has an empirical advantage over the GS. That being said, in real-world application with average drivers, I would say there is no statistically significant difference between the two. You could put them side by side and they would probably run neck and neck 99% of the time with the only difference being how well the driver hit the 2-3 shift.
However, assuming a perfect launch by a skilled driver, the wider tires on the GS would give a nominal traction advantage. For anyone who's done any competitive drag racing, the value of traction can not be underestimated, and it is entirely conceivable the advertised performance difference between the two models is purely due to the traction advantage of the GS being a larger factor in ET and trap speed than the Cd and weight advantage the base coupe enjoys.
Stand by for countering arguments....
However, assuming a perfect launch by a skilled driver, the wider tires on the GS would give a nominal traction advantage. For anyone who's done any competitive drag racing, the value of traction can not be underestimated, and it is entirely conceivable the advertised performance difference between the two models is purely due to the traction advantage of the GS being a larger factor in ET and trap speed than the Cd and weight advantage the base coupe enjoys.
Stand by for countering arguments....
11-17-2011, 03:00 PM
#7
Burning Brakes
Corvette00Car;
I dunno where you got your numbers, this weight reference has been posted on the Corvette Forum for some time w/o challenge:
The Tale of the Scale.
The curb weights for the 2010 Corvette lineup Source 2010 Corvette Order Guide page 91 http://www.kerbeck.com/kerbeck/kerbe...OrderGuide.pdf
Base Coupe 3208 lbs
Base Vert 3221 lbs
Grand Sport Coupe 3311 lbs
Grand Sport Vert 3289 lbs
2010 Z06 3175 lbs
2010 ZR1 3333 lbs
Corvette00Car;
At a curb weight of 3311 lbs, the 436 hp Grand Sport Coupe, is the second heaviest of all C6 Corvettes ever produced, trailing only the 638 hp, 3324 lbs 2009 1ZR optioned ZR1..... by a mere 13 pounds.
Also, I believe your Drag Coefficients data is suspect:
2009 CHEVROLET CORVETTE COUPE 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.286
2011 CHEVROLET CORVETTE GS 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.29.
The number you quoted for the GS is much closer to the 201x Camaro's "slick" drag coefficient of 0.37!
I dunno where you got your numbers, this weight reference has been posted on the Corvette Forum for some time w/o challenge:
The Tale of the Scale.
The curb weights for the 2010 Corvette lineup Source 2010 Corvette Order Guide page 91 http://www.kerbeck.com/kerbeck/kerbe...OrderGuide.pdf
Base Coupe 3208 lbs
Base Vert 3221 lbs
Grand Sport Coupe 3311 lbs
Grand Sport Vert 3289 lbs
2010 Z06 3175 lbs
2010 ZR1 3333 lbs
Corvette00Car;
At a curb weight of 3311 lbs, the 436 hp Grand Sport Coupe, is the second heaviest of all C6 Corvettes ever produced, trailing only the 638 hp, 3324 lbs 2009 1ZR optioned ZR1..... by a mere 13 pounds.
Also, I believe your Drag Coefficients data is suspect:
2009 CHEVROLET CORVETTE COUPE 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.286
2011 CHEVROLET CORVETTE GS 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.29.
The number you quoted for the GS is much closer to the 201x Camaro's "slick" drag coefficient of 0.37!
11-17-2011, 03:47 PM
#8
Le Mans Master
Member Since: Oct 2005
Location: Plymouth Massachusetts
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Do not believe the GM times 0-60 they just have to say it to sell the GS.It is definately a DRIVERS RACE between the two cars . Just think this all could have been eliminated if GM gave the grand sport just 10 extra HORESPOWER no one would have questioned the perfomance times,JUST 10 extra HP that is all it would have taken to end this subject for good once and for all..................................
11-17-2011, 04:08 PM
#9
Race Director
The strangest thing I find between the base and GS is that the Vert is 13 lbs heavier in base model compared to the base coupe to 22lbs lighter for GS Vert compared to its GS sibling.
Gas mileage is also different between the two. My actual gas mileage dropped 10% or so in my 11 GS vert compared to my 08 Coupe. Both have same exact drivetrain (Auto, 2.73 gears). I wouldn't be surprised if the Vert is a majority of the reason though since the coupe's rear window is more automatic.
Since you cannot get the Z51 any more in the base it has non supercar tires while the GS comes with supercar GY tires (standard feature). That is a performance difference alone due to more grip. My 08 even dropped about .3 to 60 when I put A/S ZP tires on it, no other "mods". My 11 GS Vert is constantly in the 4.5 0-60 range or so at 4300 feet altitude.
Gas mileage is also different between the two. My actual gas mileage dropped 10% or so in my 11 GS vert compared to my 08 Coupe. Both have same exact drivetrain (Auto, 2.73 gears). I wouldn't be surprised if the Vert is a majority of the reason though since the coupe's rear window is more automatic.
Since you cannot get the Z51 any more in the base it has non supercar tires while the GS comes with supercar GY tires (standard feature). That is a performance difference alone due to more grip. My 08 even dropped about .3 to 60 when I put A/S ZP tires on it, no other "mods". My 11 GS Vert is constantly in the 4.5 0-60 range or so at 4300 feet altitude.
11-17-2011, 04:51 PM
#13
Le Mans Master
Corvette00Car;
I dunno where you got your numbers, this weight reference has been posted on the Corvette Forum for some time w/o challenge:
The Tale of the Scale.
The curb weights for the 2010 Corvette lineup Source 2010 Corvette Order Guide page 91 http://www.kerbeck.com/kerbeck/kerbe...OrderGuide.pdf
Base Coupe 3208 lbs 3225..
Base Vert 3221 lbs
[B]Grand Sport Coupe [COLOR="Red"][SIZE="3"]3311 lbs 3,330 lbs
Grand Sport Vert 3289 lbs
2010 Z06 3175 lbs
2010 ZR1 3333 lbs
Corvette00Car;
At a curb weight of 3311 lbs, the 436 hp Grand Sport Coupe, is the second heaviest of all C6 Corvettes ever produced, trailing only the 638 hp, 3324 lbs 2009 1ZR optioned ZR1..... by a mere 13 pounds.
Also, I believe your Drag Coefficients data is suspect:
2009 CHEVROLET CORVETTE COUPE 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.286
2011 CHEVROLET CORVETTE GS 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.29.
The number you quoted for the GS is much closer to the 201x Camaro's "slick" drag coefficient of 0.37!
I dunno where you got your numbers, this weight reference has been posted on the Corvette Forum for some time w/o challenge:
The Tale of the Scale.
The curb weights for the 2010 Corvette lineup Source 2010 Corvette Order Guide page 91 http://www.kerbeck.com/kerbeck/kerbe...OrderGuide.pdf
Base Coupe 3208 lbs 3225..
Base Vert 3221 lbs
[B]Grand Sport Coupe [COLOR="Red"][SIZE="3"]3311 lbs 3,330 lbs
Grand Sport Vert 3289 lbs
2010 Z06 3175 lbs
2010 ZR1 3333 lbs
Corvette00Car;
At a curb weight of 3311 lbs, the 436 hp Grand Sport Coupe, is the second heaviest of all C6 Corvettes ever produced, trailing only the 638 hp, 3324 lbs 2009 1ZR optioned ZR1..... by a mere 13 pounds.
Also, I believe your Drag Coefficients data is suspect:
2009 CHEVROLET CORVETTE COUPE 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.286
2011 CHEVROLET CORVETTE GS 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.29.
The number you quoted for the GS is much closer to the 201x Camaro's "slick" drag coefficient of 0.37!
Last edited by DRLC5; 11-17-2011 at 05:01 PM.
11-17-2011, 05:14 PM
#14
Sr.Random input generator
No no, GS has pretty much same high coefficient factor as C6 Z06, which is 0.34. That 0.29 number someone gathered and has been appearing at this forum is the base coupe's number (0.286) rounded to 2 decimals by a web site.
GS indeed has a much higher drag coefficient, but it is all made to make the car much more stable at higher speeds and to accommodate wider tires. If you track your car, you'd appreciate it. If you're only going to drive on the highway with your Corvette, then base Coupe or Convertible is obviously a better fit.
The minimal acceleration advantage of GS comes from the wider/stickier tires and the model-specific manual transmission that has shorter ratios for the first few gears.
GS indeed has a much higher drag coefficient, but it is all made to make the car much more stable at higher speeds and to accommodate wider tires. If you track your car, you'd appreciate it. If you're only going to drive on the highway with your Corvette, then base Coupe or Convertible is obviously a better fit.
The minimal acceleration advantage of GS comes from the wider/stickier tires and the model-specific manual transmission that has shorter ratios for the first few gears.
Corvette00Car;
I dunno where you got your numbers, this weight reference has been posted on the Corvette Forum for some time w/o challenge:
The Tale of the Scale.
The curb weights for the 2010 Corvette lineup Source 2010 Corvette Order Guide page 91 http://www.kerbeck.com/kerbeck/kerbe...OrderGuide.pdf
Base Coupe 3208 lbs
Base Vert 3221 lbs
Grand Sport Coupe 3311 lbs
Grand Sport Vert 3289 lbs
2010 Z06 3175 lbs
2010 ZR1 3333 lbs
Corvette00Car;
At a curb weight of 3311 lbs, the 436 hp Grand Sport Coupe, is the second heaviest of all C6 Corvettes ever produced, trailing only the 638 hp, 3324 lbs 2009 1ZR optioned ZR1..... by a mere 13 pounds.
Also, I believe your Drag Coefficients data is suspect:
2009 CHEVROLET CORVETTE COUPE 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.286
2011 CHEVROLET CORVETTE GS 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.29.
The number you quoted for the GS is much closer to the 201x Camaro's "slick" drag coefficient of 0.37!
I dunno where you got your numbers, this weight reference has been posted on the Corvette Forum for some time w/o challenge:
The Tale of the Scale.
The curb weights for the 2010 Corvette lineup Source 2010 Corvette Order Guide page 91 http://www.kerbeck.com/kerbeck/kerbe...OrderGuide.pdf
Base Coupe 3208 lbs
Base Vert 3221 lbs
Grand Sport Coupe 3311 lbs
Grand Sport Vert 3289 lbs
2010 Z06 3175 lbs
2010 ZR1 3333 lbs
Corvette00Car;
At a curb weight of 3311 lbs, the 436 hp Grand Sport Coupe, is the second heaviest of all C6 Corvettes ever produced, trailing only the 638 hp, 3324 lbs 2009 1ZR optioned ZR1..... by a mere 13 pounds.
Also, I believe your Drag Coefficients data is suspect:
2009 CHEVROLET CORVETTE COUPE 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.286
2011 CHEVROLET CORVETTE GS 6-speed
The value of a drag coefficient, estimated by a-c, is Cd = 0.29.
The number you quoted for the GS is much closer to the 201x Camaro's "slick" drag coefficient of 0.37!
Last edited by X25; 11-17-2011 at 05:21 PM.
11-17-2011, 05:24 PM
#16
Team Owner
Dear OP,
this subject has been beaten to death and judging by how few posts there are so far compared to when the first couple hundred of these identical threads came out is showing that the majority of us don't give a **** anymore, if ever. But look, there are some people who will still post paragraphs and paragraphs of crap trying to defend the one over the other.
Yours in I don't give a ****,
Racer.
this subject has been beaten to death and judging by how few posts there are so far compared to when the first couple hundred of these identical threads came out is showing that the majority of us don't give a **** anymore, if ever. But look, there are some people who will still post paragraphs and paragraphs of crap trying to defend the one over the other.
Yours in I don't give a ****,
Racer.
11-17-2011, 05:58 PM
#18
Team Owner
The following users liked this post:
dhpeck (04-14-2017)
11-17-2011, 06:33 PM
#20
Burning Brakes
No no, GS has pretty much same high coefficient factor as C6 Z06, which is 0.34. That 0.29 number someone gathered and has been appearing at this forum is the base coupe's number (0.286) rounded to 2 decimals by a web site.
GS indeed has a much higher drag coefficient, but it is all made to make the car much more stable at higher speeds and to accommodate wider tires. If you track your car, you'd appreciate it. If you're only going to drive on the highway with your Corvette, then base Coupe or Convertible is obviously a better fit.
GS indeed has a much higher drag coefficient, but it is all made to make the car much more stable at higher speeds and to accommodate wider tires. If you track your car, you'd appreciate it. If you're only going to drive on the highway with your Corvette, then base Coupe or Convertible is obviously a better fit.
Drag coefficient factor of GS to be 0.34
. . . It's not that I think you're wrong, I just want an authoritive source.
Show or tell, where/how, parts and locations "the higher drag coefficient, . . . is all made to make the car much more stable at higher speeds."