4L60e shift points
#2
03-07-2012, 01:36 PM
Join Date: Mar 2009
Location: Tokeland, Washington
Posts: 21,637
here is some info on the stock settings i copied, lets see if it worked. i think stock rpm shift at wot is 5600 rpms
With today’s technological advances transmissions are just as complicated as modern fuel injection engine management systems. These super computers can make adjustments to your transmission in just millionths of a second. The days of simply making a few mechanical adjustments and improving shift quality and feel are over with. We now must take into consideration shifting strategies within the pcm or tcm to compensate for the mechanical improvements we have provided within the transmission. Below you will see a good example:
Above we have a stock table from a 4L60E transmission. This is the desired shift time table. If you noticed this table is based upon ft lbs. of torque. Look at the top row and go to 240 ft. lbs of torque, you will see that the computer is looking for a .450 second shift in that cell. This is ½ second shift from 1st - 2nd. If we were to simply install a servo and boost valve in this transmission, the computer would see that the transmission is shifting too quickly. The adaptive strategies of the transmission would then increase the voltage to the force motor, trying to achieve a softer, longer shift. This would be a complete opposite of what we are trying to achieve. In high horse power or heavy towing this long delayed shift would result in added wear to the components in the transmission. The longer the shift (smoother) the more slippage that must occur. Automobile manufactures are faced with 2 issues, a dual edged sword if you will. While they are always searching for improved ways to increase the life of the transmission, they must also consider the NVH factor. NVH stands for Noise Vibration Harshness.
Next below you will find an example of another 4L60E table which involves Torque Management. This is a strategy to control the the amount of power the transmission sees in between shifts. Giving you longer, less desirable shifts. In our tuning we do delete some if not all of this according to your needs and the build you are getting. While the most efficient would involve no slip, improve acceleration, and reduce transmission temperature. This would also cause a harsh and abrasive shift that the majority of consumers would find unrefined. Our tuning can provide you with the best of both worlds. When combined with our components we can provide the perfect set-up regardless of your needs.
With today’s technological advances transmissions are just as complicated as modern fuel injection engine management systems. These super computers can make adjustments to your transmission in just millionths of a second. The days of simply making a few mechanical adjustments and improving shift quality and feel are over with. We now must take into consideration shifting strategies within the pcm or tcm to compensate for the mechanical improvements we have provided within the transmission. Below you will see a good example:
Above we have a stock table from a 4L60E transmission. This is the desired shift time table. If you noticed this table is based upon ft lbs. of torque. Look at the top row and go to 240 ft. lbs of torque, you will see that the computer is looking for a .450 second shift in that cell. This is ½ second shift from 1st - 2nd. If we were to simply install a servo and boost valve in this transmission, the computer would see that the transmission is shifting too quickly. The adaptive strategies of the transmission would then increase the voltage to the force motor, trying to achieve a softer, longer shift. This would be a complete opposite of what we are trying to achieve. In high horse power or heavy towing this long delayed shift would result in added wear to the components in the transmission. The longer the shift (smoother) the more slippage that must occur. Automobile manufactures are faced with 2 issues, a dual edged sword if you will. While they are always searching for improved ways to increase the life of the transmission, they must also consider the NVH factor. NVH stands for Noise Vibration Harshness.
Next below you will find an example of another 4L60E table which involves Torque Management. This is a strategy to control the the amount of power the transmission sees in between shifts. Giving you longer, less desirable shifts. In our tuning we do delete some if not all of this according to your needs and the build you are getting. While the most efficient would involve no slip, improve acceleration, and reduce transmission temperature. This would also cause a harsh and abrasive shift that the majority of consumers would find unrefined. Our tuning can provide you with the best of both worlds. When combined with our components we can provide the perfect set-up regardless of your needs.
Last edited by craby; 03-07-2012 at 01:40 PM.
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