Originally Posted by Pro4Jackster

To add to this.

Most Turbo cars making 600 on the stock motor reliably are running E85. Is that true?

Parasitic losses to spinning the S/C. I have read more than once that it takes up to 80 hp to spin a Vortec S/C. I know it will have a lot of variables, but it's a good number to think about, that puts a 450 whp S/C cars' engine feeling the same stress as a 530 whp turbo car. Am I wrong on that assumption?