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Originally posted by svxboy
[B]Makes total sense. Why have more power going to the tranny that isn't going to be put to the ground properly, through the slipping bands in the tranny. Could I just install a multiple throw switch that simaltaneously disables solenoid A for full line pressures shifts and at the same time eliminates the torque control function, for use when dragging/racing?
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You could Greg, be a bit crude, It would be better to use two Small cars vacuum switchs, one on the TCU line to the A solenoid, and one on the torque control line. That way the TCU unit could be adjusted to work at say 20% throttle and the other on the Torque control line, could be adjusted to switch at full throttle. At light throttle openings, it would be normal, at higher throttle openings it would firm up the shift, and at full throttle, firm, full torque shifts.
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The other question was as to when using a manual tranny when the TCU is removed, is the torque control always active since the ECU now recieves a 0 volt signal at that terminal? In my friends 5spd SVX, power seems to fall off fast after 3000rpms.
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With the TCU removed the Torque control line is pulled up to 5 volts by the ECU, it's the TCU that pulls it down to 0 volts to reduce torque. If it is removed it should stay up at 5 volte all the time. Does your friends SVX have the exhaust resonator still fitted, won't make top end power without it.
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Also, is there a way to manually control the Air Resonance valve in the intake manifold? Is this unit at all disabled with the replacement of a manual tranny? It too could be the cause for the loss in power on the higher end if it doesn't open properly.
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Anything is possibable, but the way it is set up is to open at the right change over point, changing it to some other rpm won't help. No the manual replacement won't affect the operation. If the valve does not open it will stay in the Inerta mode, fall flat over 4000rpm. You could check if it is working by useing a light to see the arm under the manifold, that works the valve, raise the rpm to about 4500/5000, the arm should move.
Harvey.
