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What is lock-up?

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Old 12-16-2005, 11:19 PM
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Default What is lock-up?

Sorry for sounding dumb, but I just saw a dyno graph of a cam only trex a4 putting 420's rwhp to the ground locked and unlocked was like 380's. I have a yank 4000 extreme stall - when i get it dynoed, how can i 'lock' it up? Or can I?
Old 12-16-2005, 11:39 PM
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Originally Posted by TexasWS6
Sorry for sounding dumb, but I just saw a dyno graph of a cam only trex a4 putting 420's rwhp to the ground locked and unlocked was like 380's. I have a yank 4000 extreme stall - when i get it dynoed, how can i 'lock' it up? Or can I?
Lock up is when the tc is physically connected to the drivetrain as opposed to unlocked when it is hydraulically connected. Lock up is accomplished by using a clutch that is actuated by a solenoid which is, in turn, controlled by the pcm or a lock up switch.




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