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Old 07-23-2003, 19:17   #1 (permalink)
sluthy
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Formula for rwkw's?

Just wondering, is there any way of predicting how much drivetrain loss a car has? What's the average for an EA-ED Falcon? Also, I read that autos lose more power, but have more torque than manuals? I think that was in Motor.

I'm asking because I'm curious as to how many rwkw my EBII XR6 auto might have. The website says 161 at the fly, and mine is stock except for 2.5in through exhaust over 2-into-2.5.
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Old 07-23-2003, 19:36   #2 (permalink)
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Re: Formula for rwkw's?

I think the figure is roughly 30% for autos and 15% for manuals.
This is a fairly arbitrary figure though, doesn't take into accout diff ratios for example. I think the only real way to get a result is going to be to get the car dynoed...
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Old 07-23-2003, 20:19   #3 (permalink)
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Re: Formula for rwkw's?

as i understand it the torque converter multiplies torque, but you also lose some power due to the converter slippage. around 10% or so i think unless in lockup mode.
chiptorque have the ef xr6 dynoed at 114 rwkw standard but a manual. so yours would be a bit less than that. then add some since your car is modified a little.
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Old 07-24-2003, 06:59   #4 (permalink)
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General accepted figures for drivetrain loss is 25-30% for manuals and 30-35% for autos. Stock EB XR6 auto should produce somewhere around 100rwkw, depending on the dyno.
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Old 07-24-2003, 15:53   #5 (permalink)
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Re: Formula for rwkw's?

Quote:
Originally Posted by ****hy
Just wondering, is there any way of predicting how much drivetrain loss a car has? .
NO, they are all different.
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