Increased line pressure unsafe
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Increased line pressure unsafe
I have a superchips tuner and am using it to firm up my shifts in my 2006 f-150. I have been hearing that the increased line pressure the tuner uses to firm the shifts is undesireable. Can anyone tell me why.
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i may be wrong on this, so if I am sorry but i dont believe the tuner changes the pressure i believ it changes how fast the shift solinoids which are electric close to change gears. stock settings close slower to give a nice smooth shift. performance settings close much faster and give a good snap when it shifts.
Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
Originally Posted by t lindemann
i may be wrong on this,
You can't control the speed the shift solenoids change. When they are energized they move VERY fast. The speed of the shift is controlled by line pressure.
Higher line pressure works the pump harder. Also, if the chip asks for more pressure than the pump can deliver the pressure to the torque converter is shut off to help protect the clutches/bands in the trans. The torque converter can live with this for a short time, but it can cause problems if this happens for longer periods. The factory tune takes this into account. Does the aftermarket chip?
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Thanks Mark, that was exactly what I wanted to know. Can't beleive I didn't realize that myself though. I have been emailing the tech from the chip company back and forth and he seems to be skirting the question. I will be setting the transmission back to stock later today. A little more "performance feel" is not worth decreased reliablity in the trans.
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