Does anyone know if the symptoms of a sprag clutch slipping in an autobox would cause really sluggish acceleration from standstill as i have this sluggish problem and it gets even worse the hotter the car gets to the point a 1.0 micra could out accelerate me, but at around 2500rpm shed loads of power comes from now where
any ideas please
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Possibly torque converter fault . try www.fedauto.co.uk for advice
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Sprag clutch is a one-way clutch that the toque convertor reactor-ring is mounted on. The clutch locks at low rpm, causing the TC to give torque multiplication. At higher RPM the sprag clutch will disengage and the reator will rotate freely with the turbine and impeller - ensuring minimal power loss.
If the clutch is faulty (slipping) then low speed take-off will be poor, but high rpm performance will be OK. You can try doing a 'stall test' to check out the TC. You need to hold the car on the brakes and briefly floor the throttle in 'D' - the engine will 'bog out' at a particular rpm (usually 1800 - 2200) - make a note of the exact rpm - this is the TC 'stall speed' and it will tell you (if you have the factory spec.) whether there is a problem with the TC.
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