ZR1 vs. C6R - Help with understanding acceleration

[Bonnell]

I can comprehend how the C6R is faster around a track with special suspensions, etc. but it is hard to grasp how the C6R is so much faster in the 1/4 mile (first video link below) than the ZR1 which apparently has 138 more horses. How is this? Is it gearing? If so would the C6R top out at a lower speed than the ZR1 given enough road?

Corvette Drag Race - YouTube

Chevrolet Corvette ZR1 vs C6.R - The Ultimate GT Showdown - YouTube

 

[Huskerman]

Gearing may have some input but I think it is the power to weight ratio that makes up the big difference.......The C6 R is going to weigh less. ZR1 = 3300 lbs C6 R = 2700 lbs

 

[catbert]

One is a racecar and one is not. The reduced weight (600 pounds), sequential gearbox and all the trick bits and pieces that a million dollars can buy does make a difference. Top speed is a matter of horsepower vs. weight and drag, and the downforce additions and flares on the R might detract from top speed. The street car might take it on the top end. It would be interesting wouldn't it?

2012 Corvette ZR1 and Corvette C6.R Specifications

[TD="width: 143"] 2012 Corvette ZR1 [/TD]
[TD="width: 171"] 2012 Corvette C6.R [/TD]

[TD="width: 179"]Displacement (L / ci):[/TD]
[TD="width: 143"]6.2 / 376[/TD]
[TD="width: 171"]5.5 / 336[/TD]

[TD="width: 179"]Horsepower:[/TD]
[TD="width: 143"]638 @ 6500 rpm[/TD]
[TD="width: 171"]491 @ 5800 rpm[/TD]

[TD="width: 179"]Torque (lb-ft):[/TD]
[TD="width: 143"]604 @ 3800 rpm[/TD]
[TD="width: 171"]485 @ 4800 rpm[/TD]

[TD="width: 179"]Bore diameter (mm / in):[/TD]
[TD="width: 143"]103.25 / 4.06[/TD]
[TD="width: 171"]103.89 / 4.090[/TD]

[TD="width: 179"]Crankshaft stroke (mm / in):[/TD]
[TD="width: 143"]92 / 3.62[/TD]
[TD="width: 171"]80.90 / 3.185[/TD]

[TD="width: 179"]"V" angle (deg):[/TD]
[TD="width: 143"]90[/TD]
[TD="width: 171"]90[/TD]

[TD="width: 179"]Cylinder bore spacing
(mm / ci):[/TD]
[TD="width: 143"]111.7 / 4.40[/TD]
[TD="width: 171"]111.7 / 4.40[/TD]

[TD="width: 179"]Valvetrain:[/TD]
[TD="width: 143"]pushrod with overhead valves, titanium inlet[/TD]
[TD="width: 171"]pushrod with overhead valves, titanium inlet and exhaust[/TD]

[TD="width: 179"]Valves per cylinder:[/TD]
[TD="width: 143"]2[/TD]
[TD="width: 171"]2[/TD]

[TD="width: 179"]Camshaft drive:[/TD]
[TD="width: 143"]chain[/TD]
[TD="width: 171"]chain[/TD]

[TD="width: 179"]Cylinder case material:[/TD]
[TD="width: 143"]aluminum[/TD]
[TD="width: 171"]aluminum[/TD]

[TD="width: 179"]Cylinder liners:[/TD]
[TD="width: 143"]dry iron[/TD]
[TD="width: 171"]aluminum[/TD]

[TD="width: 179"]Cylinder head material:[/TD]
[TD="width: 143"]aluminum[/TD]
[TD="width: 171"]aluminum, CNC ported[/TD]

[TD="width: 179"]Lubrication system:[/TD]
[TD="width: 143"]dry sump[/TD]
[TD="width: 171"]dry sump[/TD]

[TD="width: 179"]Fuel system:[/TD]
[TD="width: 143"]sequential EFI[/TD]
[TD="width: 171"]sequential EFI[/TD]

[TD="width: 179"]Throttle system:[/TD]
[TD="width: 143"]supercharged w/intercooler, throttle body[/TD]
[TD="width: 171"]individual runner, two 29.2mm intake air restrictors (series mandated)[/TD]

[TD="width: 179"]Fuel:[/TD]
[TD="width: 143"]premium unleaded gasoline required[/TD]
[TD="width: 171"]E85R ethanol (ALMS)
E10 (Le Mans)[/TD]

[TD="width: 179"]Body style:[/TD]
[TD="width: 143"]two-door hatchback coupe[/TD]
[TD="width: 171"]two-door hatchback coupe[/TD]

[TD="width: 179"]Drivetrain:[/TD]
[TD="width: 143"]longitudinal front engine, rear-wheel drive[/TD]
[TD="width: 171"]longitudinal front engine, rear-wheel drive[/TD]

[TD="width: 179"]Transmission:[/TD]
[TD="width: 143"]Tremec TR6060 6-speed manual transaxle[/TD]
[TD="width: 171"]Xtrac 6-speed sequential transaxle[/TD]

[TD="width: 179"]Chassis:[/TD]
[TD="width: 143"]hydroformed aluminum chassis, composite body[/TD]
[TD="width: 171"]hydroformed aluminum chassis, composite body[/TD]

[TD="width: 179"]Wheelbase (mm / in):[/TD]
[TD="width: 143"]2685 / 105.7[/TD]
[TD="width: 171"]2685 / 105.7[/TD]

[TD="width: 179"]Length (mm / in):[/TD]
[TD="width: 143"]4476 / 176.2[/TD]
[TD="width: 171"]4476 / 176.2[/TD]

[TD="width: 179"]Width (mm / in):[/TD]
[TD="width: 143"]1929 / 75.9[/TD]
[TD="width: 171"]2047 / 80.6[/TD]

[TD="width: 179"]Height (mm / in):[/TD]
[TD="width: 143"]1236 / 48.7[/TD]
[TD="width: 171"]1166 / 45.9[/TD]

[TD="width: 179"]Weight (kg / lb):[/TD]
[TD="width: 143"]1521 / 3353[/TD]
[TD="width: 171"]1245 / 2745[/TD]

[TD="width: 179"]Front suspension:[/TD]
[TD="width: 143"]independent, short/long arm double wishbone, cast aluminum controls, transverse-mounted composite leaf spring, monotube shock absorbers, anti-roll bar[/TD]
[TD="width: 171"]independent, short/long double wishbone, fabricated steel upper & lower, machined aluminum knuckle, coil-over multi-adjustable shock absorbers, anti-roll bar[/TD]

[TD="width: 179"]Rear suspension:[/TD]
[TD="width: 143"]independent, short/long arm double wishbone, cast aluminum control arms, transverse-mounted composite leaf spring, monotube shock absorbers; anti-roll bar[/TD]
[TD="width: 171"]independent, short/long arm double wishbone, steel fabricated upper & lower control arms, machined aluminum knuckle, coil-over multi-adjustable shock absorbers, anti-roll bar[/TD]

[TD="width: 179"]Brakes:[/TD]
[TD="width: 143"]front and rear power-assisted carbon-ceramic disc with 6-piston front and 4-piston rear calipers, cross-drilled rotors, ABS[/TD]
[TD="width: 171"]4-wheel disc with monoblock calipers, steel rotors and ceramic composite pads[/TD]

[TD="width: 179"]Wheels (in):[/TD]
[TD="width: 143"]19 x 10 (front); 20 x 12 (rear)[/TD]
[TD="width: 171"]18 x 12.5 (front); 18 x 13 (rear)[/TD]

[TD="width: 179"]Tires:[/TD]
[TD="width: 143"]Michelin Pilot Sport 2,
P285/30ZR19 (front),
P335/25ZR20 (rear)[/TD]
[TD="width: 171"]Michelin racing tires,
30/68-18 (front),
31/71-18 (rear)[/TD]

[TD="width: 179"]Fuel capacity (L / gal):[/TD]
[TD="width: 143"]68.1 / 18[/TD]
[TD="width: 171"]90 / 23.77 (E10)
110 / 29 (E85)[/TD]

 

[Hib Halverson]

"Catbert" hit the nail squarely on the head with his comparison.