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  1. #726
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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    The following assumes the torque converter is not locked up. Torque converter lock up occurs when hydraulic pressure is feed to a clutch in the torque converter, and the engine and transmission input shaft are directly mechanically coupled. The mechatronics controls torque converter lock up.

    By design a torque converter allows the engine and transmission input shaft to spin at different speeds. The stall speed of the converter is some rpm at which the engine can spin no faster without causing the input shaft to turn. This speed is a function of the properties of the ATF used, and the internal design of the of the torque converter.

    Keeping this speed low causes less losses in the torque converter and higher fuel economy. However, in the case of the single turbo cars, torque is not built at such a low rpm as it is with twins. So what ends up happening is engine output is reduced at the stall speed when going to a single turbo. The way to fix this is to get a torque converter with a higher stall speed so that engine output is higher when the stall speed is reached.

    Until the torque converter is locked up, fluid dynamics is the only thing coupling the engine to the transmission input shaft. A higher stall speed allows a greater difference between the engine and the input shaft.
    Good info ! always nice to learn something new

  2. #727
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    Until the software is cracked...I would want to see some sort of frankenstein build between the Ford equivalent with the n54 Click here to enlarge

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