Sure, it's not hard. For any power tune (you can "re-do" the one you're using), once you select the tune level, select "Custom Options". If you've done this before, make sure you "Reload Previous Settings", as the first step once you're in the Custom Options menu. If you've never used Custom Options, please read through my Q & A on this confusing menu here:
http://dygytalworld.ehost-services13...ead.php?t=1101 (in fact, it would be a good idea to do it regardless).
Once you insure that your tire size and gear ratio are still correct and have all the other settings to your liking, Go to the "Part Throttle Upshift/Downshift" and "Torque Converter Lock/Unlock" choices. These change the speed at which these events happen by a small amount. As I recall, the Up/Downshift points can be adjusted +/-2, +/-3, and +/-5 mph for each gear change. I wanted mine to change at a lower speed, so I adjusted all of them to the negative maximum. Supposedly, this can improve your fuel economy a bit by getting you into higher gears sooner and keeping you there longer. I just wanted to reduce the tendency of the transmission to downshift when I thought there was still a power reserve.
I did the same thing with the Torque Converter Lock/Unlock points. These are a bit more aggressive and there are four of them (one for each gear). They can be adjusted +/-2, +/-3, +/-5 and +/-10. Again, I reset all of them to the negative maximum, hoping to keep the TC locked up longer.
It seems to have helped. I don't get the overeager unlocking on the slightest incline that I used to have.
Note these "Part Throttle" adjustments have no effect whatsoever on WOT shifts. And, since part throttle shift and TC change patterns depend on both speed and throttle position, just a little more throttle at a given speed is all it takes to cause a downshift or TC unlock if that is wanted.
Hope this makes sense.
- Jack
Sat, June 27th, 2009, 07:12 PM
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