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What does it do? What kind of difference would you notice when you add one? Do they make them for our cars (mine being a 02 coupe AT)?

 
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all it does is let your brake launch at a higher RPM instead of it only going to 2700 RPM you can go to i think 3500-4000 RPM

 
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Torque convertor is part of an automatic transmission. It's the link between the engine and transmission. Compared to a manual tranny, the nature of a torque convertor results in some loss.

 
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I have heard that if you have a AT, upgrading your torque convertor is the best thing to do. Please inform me of knowledgable data [IMG]i/expressions/face-icon-small-smile.gif[/IMG]

 
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It converts the power from your engine to the tranny internals and driveline. Its sorta like a manual tranny clutch but based off of fluid coupling instead of a pressure plate. A higher stall TC will allow you to spool up more power and rpms before you launch.

 
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So I guess there wouldn't be much increase in power eh?

 
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check herecheck here
and here
and here too

 
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there would be if there were any power at the crank. e.g. if you've done a swap and/or turbo (and want an auto for some reason), a torque converter would be a good next choice to increase power to the wheels.