Quote:
Originally Posted by Hesh
Roughly thats about 20% 385-20% is 308. 15% is 327. Dont know where anyone is getting 28%. My math isnt great, worst subject but I know it wasnt done at 28%. So around 385 at the crank would be around the numbers you would be looking for to get somewhere around the 315 to the tires. Depending on if that car was a manual or auto.
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Actually, no it wouldn't be. If your car makes 315hp to the rear wheels and you factor in at a 15% loss through the driveline, which would only be appropriate for an auto transmission, you would take that 315hp and divide that by .85 which would net you a grand total of roughly 370.6hp at the crank. The twelve percent loss you could reasonably expect with a manual transmission car would garner you a corrected crankshaft horsepower rating of roughly 362.06hp at the crank. Not picking nits here, but a 15hp dicrepancy is hardly insignificant and a 23hp discrepancy is very meaningful at these overall power numbers.
Your understanding of the math as stated at the beginning of your post is correct, but the numbers you post regarding the 315rwhp ending up as a 385chp rating don't jive with the same. Just saying.