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power losses through the drive train? 


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 Post subject: power losses through the drive train?
Posted: Thu May 12, 2005 9:05 pm 
Parts Gopher

Posts: 69

Joined: 2nd Feb 2005

Location: melbourne
VIC, Australia

can ne1 tell me the rough power loss from the engine to the wheels? its backed by a 4 speed auto?
Posted: Thu May 12, 2005 10:18 pm 
Getting Side Ways
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Age: 64

Posts: 3552

Joined: 7th Nov 2004

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Power: 482 rwkw

Location: Penrith
NSW, Australia

Well a 240 kw XR6t puts out 180 rwkw in auto form and little over 200 rwkw manual....On same dyno on same day...Over 8 to 10 different cars of same model..Whats that approx 10% difference...



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Posted: Fri May 13, 2005 12:44 am 
Stock as a Rock

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Ride: Fairmont

Location: Melbourne
VIC, Australia

A good manual box will loose around 15-20%, the ford 4 speed auto will be around the 25-30% mark. As with everything mechanical you must take into consideration age, kms travelled, engineering tolerances etc etc



V8 Windsor here we come.....

Posted: Fri May 13, 2005 8:14 am 
Stock as a Rock
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Age: 41

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Ride: ED Fairmont Ghia 5.0L

Location: Brisbane
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I have also found that the more power you have the less difference you will have between the motor and rear wheels.
The e-series v8 had about 110-115 rwkw with a 165kw donk.
If I took that diference and applied it to my 180odd rwkw, I would haveabout 270 odd fly wheel kw.
In reality i think it's more like 240 odd fwkw, like the BA turbos.
Just an observation I thought might be worth mentioning



ED Fairmont Ghia.
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Posted: Fri May 13, 2005 3:09 pm 
Getting Side Ways
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This topic is discussed heaps on the net. From what I know, from engineering school, a piece of equipment takes a certian amount of power to turn, you get the rest from its outlet. There from power lose isn't really a percentage of input power, it's a fixed number for a fixed load.

I'd say about 20-30kW for a manual and 40-60kW for an Auto. Chich is right though, a s**t condition box will have more loss.



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