Those numbers are not really accurate, Phil. As i understand it, the basic
formula is thus:
15% for a modern manual
20% for a modern automatic
then add 5% if it is rear wheel drive and add another 5% if it is a old
musclecar or something.
But it's important to note that these numbers are just a general
guideline... the loss can increase or decrease based on what the exact
configuration is, and what quality of components are used, etc. Actually,
an exact scientific percentage can never be determined because at different
points in the operation of the vehicle the loss can change. (engine speed,
gear, position of the moon)
What the basic percentage gives you is a rough estimate of what you will
lose at PEAK horsepower. Keep in mind that the racing industry would have
better loss percentages than what is considered okay to have in say... a
stock pickup truck.
Hope that makes sense/helps.
Sean Bruckman
----- Original Message -----
> . Also, according to several dyno shops, engine
> builders, and personal experiences...the driveline loss (on the
> average) is: Manual = 20%
> / Automatic = 23%-25%.
> I saw this in an earlier post and was wondering why
> the loss is expressed as a percentage. How come its
> not a certain amout? So a motor making 400 HP loses 25
> percent= 100 HP and a motor making 300 HP loses 75 HP,
> even with identical drivetrains? I don't understand
> why. Could someone shed some light on this for me?
>
> =====
> Phil
> Havana IL
> 98 CC 318 Auto
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