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lets clear up the drive train loss theory! (archive)

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Posted by eric_m3 on December 17, 2001 at 16:22:13:

Well it seems that every time someone goes to the dyno they come back w/ rear wheel h.p. figures which are reasonably accurate. I mean you get an idea where you are but the best way to get a true median figure would be to do 4-5 runs and use the average of the runs to establish a better basline figure.

BUUUUUT! This bull shit about a percentage of drive train loss is totally inaccurate so please stop figuring a percentage of loss! Here is why.

Take a totally stock M3 and dyno as described above. You will naturally come up w/ the h.p. figures at the rear wheels. Now look at the factory figures for the engine ( we will assume 192h.p.) You will now be able to get two different figures. Subtract rated engine h.p. from wheels h.p. and you will get an actual loss of h.p. at the wheels
right? It may now also be represented as a percentage of power lost too right?

But what friggin' genius decided that all figures for pwer loss is a percentage of loss? Did you add some giant flywheel to your car and remove all of the tranny lubricant to increase drivtrain loss while increasing engine power?

Math 192 h.p. - 17%=159 rear h.p. loss of 33h.p. to drive train
238 h.p. - 17%=197 rear h.p. loss of 41 h.p. to driv train?

YOU STILL ONLY LOSE 33 h.p. from the drivetrain whether engine power is 192 or 238!!!!!!!!!

The same amount of h.p. would still be l;ost regardless of whether or not the engine h.p. went up or down right?

Another bad myth explained. Happy Holidays, you just found some accurate info although you think you just lost horsepower.


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