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Message: [QUOTE="Mark Kovalsky, post: 490418, member: 1654"] Locking the converter at the right time will pass 10-15% more torque from the engine to the transmission. Locking too soon can [I][B][U]CUT[/U][/B][/I] the torque by at least 25%. When I was engineering these things I plotted tractive effort (the force the wheels exert against the pavement) in each gear with the torque converter locked and unlocked. Then I locked the converter at the speed where the lines intersected. At lower RPM when the torque converter has a large amount of slip it is [I]creating[/I] torque. There is more torque out of the torque converter than the engine is putting into the torque converter. If you want to see how, go to [URL="www.howstuffworks.com"]www.howstuffworks.com[/URL] and look up how a torque converter works. Once the RPM comes up the torque multiplication goes away and now the converter is just a fluid coupling that is losing about 10-15% of the torque the engine is putting into the converter. That's when locking up makes sense. [/QUOTE]

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