Friday, April 15, 2011

Performance Torque Converter

Modify a daily driven engine is a tricky business compare to build up a track car. We need to sacrifice one to favor the other. Such as, fuel economy for acceleration, reliability for performance or low end torque for high end horsepower.

Power (more accurately, torque) is never delivered directly from the flywheel to the pavement, without first being multiplied by gear ratios in the transmission and differential. For an example,a car with a 4.0:1 gear ratio puts 33% more torque to the wheels than a car with a 3.0:1 gear ratio with no increase in engine torque. However, changing gear ratios may affect drive ability because the engine revs higher at all speeds which uses more fuel and simply wears out faster. Changing gears ratio will help the car accelerate faster but the engine keep on revving at the high rpm.

Torque Multiplier
There is a torque "multiplier" above and beyond the trans and gear for an automatic transmission. This unit is called the torque converter—a fluid coupling that disengages the engine from the transmission at idle so that you can pull to a stop or shift gears without stalling the engine. The torque converter is actually a misnomer—it should be called the "torque multiplier" because it doesn't simply provide a one-to-one connection to the transmission like a clutch does with a manual transmission.

Modify torque custom machines the internal components to provide the correct stall speed (slip). Besides that, modified torque able to increase durability by furnace-brazing the impeller and turbine vanes in place in addition to installing a larger ceramic-impregnated lock-up clutch.


The left torque converter is the modified converter which lighter of weight and smaller of size compare to the original torque converter on the right.

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