my 1st FORD
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stopping tc lockup on any performance failure/drop increases trans temp dramatically and increases probability of trans damage. TC lockup lowers heat, open converter makes more heat than you can believe cooking trans in spite of large cooler.
Ken
Ken
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Joined: Apr 2005
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From: Washington state
the reason they turn off TC lockup under engine performance failures in the PCM firmware logic algorithm is to prevent heat and mech damage to slipping TC clutches in an uneven missing power application.
TC clutch slippage will destroy the LU clutch far faster than non lockup issues.
when the TC clutch slips for extended periods and overheats, it starts throwing friction material which causes catostropic failure of the torque converter which then feeds cuttings and broken parts into the main tranny
aka grenading.
the higher rpms from lockout cause higher ATF flow rates and higher coolant rates than there would be under constant slippage scenario.
the first early TC lockup auto trannies were grenading monsters.
TC clutch slippage will destroy the LU clutch far faster than non lockup issues.
when the TC clutch slips for extended periods and overheats, it starts throwing friction material which causes catostropic failure of the torque converter which then feeds cuttings and broken parts into the main tranny
aka grenading.
the higher rpms from lockout cause higher ATF flow rates and higher coolant rates than there would be under constant slippage scenario.
the first early TC lockup auto trannies were grenading monsters.
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Aug 16, 2003 01:07 PM
