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Finally in order to achieve the higher currents that the high torque targets require, and the increased current targets allow, you will need to trick the TCM into raising the current at high target pressure. Next you will We need to do this because the calibration of current required for a given clutch pressure has a hard coded input limit of 16.7 bar, and while the clutch is in a “hold” phase during steady state, it is all fully open loop control.
We need to change the Clutch A/B solenoid compensation maps (example attached) which are not currently scaled but numbers are essentially milliamps.
Below we can see that where the fixed stock calibration would stop at 16.7 bar we add pressure target inputs up to 20 bar, and increase the current required.
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Increased line pressure.
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And set your line pressures (Min Tgt Line Press A & D and Target Line Pressure E)
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Clutch Friction
Bad Shift behaviour with built transmissions and aftermarket clutches can often be improved by fine tuning the clutch Friction tables. These form the initial part of calculating the required pressure for a given torque transmission.
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