Yeah, left foot breaking involve transfering more weight onto the front suspension, and the front squats down. Acceleration (on fwd will have more traction, and can pull harder) but will make the back end squat down as well, and the car can pull some harder speeds in turns. At least as i understand it.
As for heel-toe...its more for smooth transitions without sudden jerks than it is for synchros. As soon as you move the shifter from neutral into position (whichever gear it may be), whether the clutch is in or not, the synchros have done their job and are no longer part of the equation. As long as you have the pedal pushed in, the clutch that is, then revving then engine will do nothing to the transmission. Heel-toe has nothing to do with synchros unless your double cloutching as well. AS for synchro life, all of mine have lasted as long as the tranny, which has been as long as the engine coincedintally. Anyway, mine all have had 200k+ miles on em. one above 250k so far. So double cloutching isn't neccesary for your synchros, and they wont die if you shift normally. If they go out, they are relatively simple to replace, and by no means indicates the end of a tranny.
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