|
Matt37 -> ZR1 numbers are in... 638 HP/ top speed 205 MPH (4/25/2008 11:18:20 AM)
|
The official dyno numbers are in: The supercharged 6.2-liter V8 in the forthcoming Chevy Corvette ZR1 cranks out 638 horsepower.
That's about 20 hp more than the estimates from General Motors' powertrain gurus when they unveiled the new ZR1 and its monster motor last December.
To simplify the math: The LS9 engine in the ZR1 is rated at 103 hp per liter of displacement, or 1.7 hp per cubic inch (6.2 liters is equal to 376 cubic inches, for the old schoolers in the audience.)
All that power will push the Corvette ZR1, which goes on sale this summer, to a top speed of more than 200 mph, GM says. A suggested retail price for the car hasn't been set, but it is expected to be in the neighborhood of $100,000.
What about the grunt? The official number is 604 lb-ft of torque.
The key to that making all the horsepower and torque is a Roots-type supercharger with four-lobe rotors that sits atop the LS9 engine. A liquid-to-air intercooler is integrated into the supercharger's housing.
The supercharger has a volume of 2.3 liters, with a maximum boost pressure of 10.5 psi. Turning that blower required engineers to fit the LS9 with an 11-rib accessory drive belt.
The engine will be hand-built at GM's Performance Build Center in suburban Detroit, the same plant that hand-builds the LS7 V8 used in the Corvette Z06.
Time for some bench measuring, you say? OK:
-- The 6.0-liter V12 in the Ferrari 599 GTB Fiorano is rated at 620 hp and 448 lb-ft.
-- The 6.5-liter V12 in the Lamborghini Murcielago is rated at 580 hp and 650 lb-ft.
-- The turbocharged 3.6-liter flat six-cylinder engine in the Porsche 911 GT2 is rated at 530 hp and 505 lb-ft.
There is a video on the site as well..
http://www.autoweek.com/apps/pbcs.dll/article?AID=/20080425/FREE/411854900/1528/newsletter01
|
|
|
|
