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Full power shift tend to break the tires loose. Looks, sound and feels cool but........There is a risk of loss of control when the tires break loose on a shift. Also the 1/4 mile time may improve when the tires stay in full contact and the chassis/suspension does not have to absorb a shock load. Backing off the engine torque a little during the shift isn't all bad. Makes for simple reliable and smooth shifts from one clutch pack to another.
Quarter mile? You're speaking my blood. Worked on funny car engines mid to late 60's. There you had to adjust clutches with sufficient slip dependent on the track you were on, weather conditions and who was driving. Had a 68 Mustang that if you stomped on it in 4th while doing 65 mph, you'd break the tires loose until you got back out of it. Currently built a 318 95 Dakota enough to do high 12's w/o nitrous and still be streetable. This new stuff "computer torque reduction" makes me a bit nauseous.