The Corvette Blogger via Jalopnik reports some independent chassis dyno results for the new 2009 Corvette ZR1 supercar. Now the LS9 supercharged 6.2L V8 in the Corvette ZR1 is not identical to the LSA 6.2L supercharged V8 in the new CTS-V. The one in the Corvette is hand built and hardened a bit compared with the more production engine in the CTS-V. The Corvette makes 638hp, the CTS-V 556hp. The Corvette has a larger supercharger at 2.3L vs 1.9L for the Cadillac. But it is interesting to see how the Corvette engine performs none the less as a ruler for where we might see the CTS-V perform.
Results? The average chassis dyno was 548hp. With tuning the shop was able to get them up to around 567hp. At 15% transmission/drivetrain loss, the 548hp matches up well enough with the claimed 638hp of output at the crankshaft. Put another way, 548hp represents 14% drivetrain loss which is in the expected range.
Hopefully we will see the CTS-V manuals put up similar numbers, hitting around 475hp on the chassis dyno.