When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have heard some say the driveline losses on a ZR1 are as high as 18%. An 18% loss on 638 crank would yield 523 WHP.
The actual number is closer to 10% since the ZR1 shares the same drive system as the Z06. This was proven by Victor (FNBADZ)6) when he dnoed his engine at 765 HP, it made ~670 on a Dyno with 3.90 gears which are about 3% less effiecent on the dyno as 3.42's!