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Old 01-20-2016, 11:31 AM   #1
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Drivetrain loss calculation

Hey all,

So I've heard 15% drivetrain loss, 17.5%, and 20% loss to name a few. Can anybody tell me which one is actually correct? Or the closest to actual power loss in an '01 V6. I need it to calculate power at the crank from a dyno graph
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Old 01-23-2016, 04:16 PM   #2
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Well, there really is no such thing as a "correct" value to assign to drivetrain loss. Every vehicle and is different. Dynamic loss, which applies when using a chassis dyno consists of inertia, drag, windage, and friction forces. These all attribute to power loss which is mainly caused within the transmission and drivetrain, not the main shaft (driveshaft) as all the aftermarket driveshaft manufacturers would have you believe.

What is more important than simply identifying an overall percent of loss is to evaluate your dynograph and calculate where the highest percentages of loss are occurring throughout the powerband.
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Old 01-25-2016, 02:41 AM   #3
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Quote:
Originally Posted by sonicpony03 View Post
Well, there really is no such thing as a "correct" value to assign to drivetrain loss. Every vehicle and is different. Dynamic loss, which applies when using a chassis dyno consists of inertia, drag, windage, and friction forces. These all attribute to power loss which is mainly caused within the transmission and drivetrain, not the main shaft (driveshaft) as all the aftermarket driveshaft manufacturers would have you believe.

What is more important than simply identifying an overall percent of loss is to evaluate your dynograph and calculate where the highest percentages of loss are occurring throughout the powerband.
Dang it, why can't anything for cars be simple lol Thanks for the good info
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The chargers are slugs lol
2001 3.8L - Cheap SR CAI, SF4/X4 w/ 91 Octane Bama Tuning, Pacesetter H-pipe and Borla Stingers, Auburn HP Limited-Slip Diff, FRPP 4.10 gears

Coming EVENTUALLY: BBK headers, Eibach Springs, FRPP Aluminum Driveshaft, Maximum Motorsports Caster Camber Plates
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Old 01-25-2016, 09:25 PM   #4
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Dang it, why can't anything for cars be simple lol Thanks for the good info
No problem. I mean if you want to use a value to roughly determine some numbers its semi plausible to say that 12-25% of the power generated at the engine is being lost by the time it is transferred to the pavement.

If you really dissect the dynograph you'll find that some losses are much higher than even 25% based on where the hp/torque is distributed and peaks.
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