Here in Florida (the FLAT state) I immediately noticed a difference after being used to driving a Yukon Denali for several years. When I have the cruise control set at 75mph, it maintains the speed just fine, until I come to a standard overpass. About half-way to the top, the cruise control causes the transmission to downshift and the rpms go from about 2250 to a little over 3000 rpms and the speed jumps from 75 to about 78mph. Then, as we reach the top of the overpass (not a steep hill by ANYONE'S judgement) the transmission shifts back, the rpms return to 2250 and the speed drops back to 75mph.
While I don't know if this qualifies as being a suction event --- it is definitely irritating, and the cruise on the GMC Yukon did not act this way. I have noticed that when accelerating up to 75mph on the level interstate, the transmission seems to stay in third gear (about 2500 rpm) until I back off on the accelerator pedal slightly. At that point, the transmission shifts and the revs drop from 2500 to 2250. Not a very big difference? Is this typical too? Is that the "overdrive" gearing?
What is torque control management? (in fifty words or less?)
Is this what they talk about regarding programmers being able to change shift points???
Ed
"Artificial intelligence is no match for natural stupidity"
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06-22-2003, 12:03 AM
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