is 4wd not a better alternative to 2wd in the front or back. 4wd has more traction so it would make acceleration faster would it not? if so why do nascars, drag cars, etc not use it as opposed to rear/front wheel drive?
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Distributing the power to all 4 wheels requires a lot more metal in the parts that do the work. Those are some strong pieces of metal since they have to withstand the power of the engine and the roughness or the roads. Also keep in mind that wheels don’t all turn at the same speed, so a differential or equivalent is required to allow their speeds to vary. Now you’ll need a couple of those, and they typically have their own oil for lubricant, etc. Point is, your car is becoming much heavier.
And if you’re racing, weight is a huge concern. 2WD seems like a bargain. But even on the regular roads, saving that weight and material is a good thing, ultimately reducing cost.
There are other interesting technical hurdles, but this is probably the most serious one.
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