coz 1g's are long and heavy as shit. they are old nuggety motors which turn the ae86 into a lead tipped arrow.
most of the weight hangs in front of the front wheels ruining the natural balance the ae86 has.
i did mention 1g's are shit? coz they are, your better off putting the 1uz in there than a 1g engine. at least the 1uz is all alloy and can make a shit load of power.
never heard of josh young with the 1uz in his drift car?
if you want power or turbo your better off turbocharging a GZE or something you will get just as much power and much better powerband.