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Old 02-06-2013, 05:34 PM
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Originally Posted by Jamesonsviggen View Post
Your 17-20% drivetrain loss is high for a modern engine. Today manuals are more in line with 10-12% and automatics are more like 15%. The n55 I saw dyno in person put down about 268whp. My guess is crank is 315 or so.
Interesting. Was that a Mustang Dyno or Dynojet (Mustang Dynos are always much lower). It's good to see more results from N55 dynos.

I can see 15% on a modern auto. 20% does seem pretty high. Some dyno sheets I've seen tell you to divide by a certain number (.something), and when you do, you usually get the same figure as you would if you just factored in a 15-18% drivetrain loss.

Here's the 277 RWHP Insideline dyno:

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