Converter efficiency
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 816
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From: Finland
Converter efficiency
Anybody having tried different ATF to get different slippage/efficiency out of the driveline? And would the different viscosity also effect the stall rpm slightly?
Was thinking of if there is a practical difference using RedLine Synthetic ATF vs RedLine Synthetic High-Temp ATF.
http://www.redlineoil.com/pdf/3.pdf
This crossed my mind after I found this text on web
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Efficiency
h (m) = is P(out)/P(in). This is a function of fluid viscosity, fin design in the turbine and impeller units, T(out), T(in) and other variables. Torque converters run at efficiencies anywhere from 0-95% depending on w(in), w(out), and T(in) and T(out). For example, when a car is stopped at a traffic light, the engine still applies power to the input shaft, but the brakes and transmission prevent the output shaft from rotating. Since P(out) = T(out) * w(out), and w(out) equals zero, P(out) equals zero. Therefore, the efficiency equals zero.
When a car is traveling at highway speeds, the turbine is rotating nearly as fast as the impeller. Recalling that they are attached to the output shaft and the input shaft respectfully, then P(in) » P(out) and therefore efficiency is rather high.
---
Was thinking of if there is a practical difference using RedLine Synthetic ATF vs RedLine Synthetic High-Temp ATF.
http://www.redlineoil.com/pdf/3.pdf
This crossed my mind after I found this text on web
---
Efficiency
h (m) = is P(out)/P(in). This is a function of fluid viscosity, fin design in the turbine and impeller units, T(out), T(in) and other variables. Torque converters run at efficiencies anywhere from 0-95% depending on w(in), w(out), and T(in) and T(out). For example, when a car is stopped at a traffic light, the engine still applies power to the input shaft, but the brakes and transmission prevent the output shaft from rotating. Since P(out) = T(out) * w(out), and w(out) equals zero, P(out) equals zero. Therefore, the efficiency equals zero.
When a car is traveling at highway speeds, the turbine is rotating nearly as fast as the impeller. Recalling that they are attached to the output shaft and the input shaft respectfully, then P(in) » P(out) and therefore efficiency is rather high.
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Last edited by Vesa; May 27, 2008 at 07:12 AM.
