Post by
Q45tech »
https://forums.nicoclub.com/q45tech-u112.html
Thu Sep 05, 2002 8:54 am
It depends on where the pressure leaks are and the wear of the clutch material, Generally the timing is set by the software inside the tcu and the lags built into the valve body design.
The friction coefficient of the ATF [slip ratio] is optimized to reduce lock up shudder so a less slippery ATF [Redline High temp] or decreasing the ATF temperature will increase the viscosity which will automatically increase the pressure.
If the shift time increases as the tranny warms up in summer say from 5 minutes after a cold crank to 10-15 minutes you know the viscosity is one of the problem.
The problem with increasing the pressure is its effects on non worn parts which may dramatically reduce the units life.
Level Ten in New Jersey are the experts on modifying trannys for racing.
The JWT trimode tcu has a power 1st gear start position, along with normal 1st and 2nd gear start for snow. This unit increases the duty cycle on the pressure solenoid to allow the tranny to stay in gear longer and does crispen the shifts if the tranny is not worn!