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Message: <blockquote data-quote="Lightning Struck" data-source="post: 204108" data-attributes="member: 8009">I totaly disagree with that, your using a 20% drivetrain Loss and for the most part I think thats what is normally accepted as correct but if you do a little research on this subject you will find that may PRO"S in the performacne business thinks that using a % for drivetrain loss is a VERY flawed method for determing flywheel HP. I dont think there is a increased loss in power Thur the drivetrain just because there is a INCREASE in power at the motor. I may be wrong but thats what I think........I would have to go back and find all those write ups and articles on this subject, but trust me there are a LOT OF THEM. Even so I think using the 20% for a manual trans would be too high anyway, 5speeds would be in the 15% area and a AUTOMATIC in the 20% area. Again thats IMO and could be wrong, but I'm going off what I have read over the years.Look at it this yay......lets use that 20% you quoted and put that on my Lightning, my STOCK dyno was 351rwhp so that would mean its putting out 440HP ( thats 60 over factory rating ) and thats with my automatic. See what I'm getting at??? I DO remember reading that for a typical mustang with a manual trans that a 35hp loss Thur the trans was a pretty good average loss on any car weather is 200hp or 500hp.........what do you guys think? on a side note I would LOVE to believe that a 20% loss ( or more ) was true on my L, if that WERE true and I get sayyyy 440 on the dyno next week that would mean that I have 550 flywheel hp :bunny3: :dancing6: :bunny3: :dancing6: but who knows :dunno: I read a post on <a href="http://www.nloc.net" target="_blank">www.nloc.net</a> by a guy that said the L's only loose 12% from motor to wheels :-\</blockquote>