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Originally Posted by mazda6guy
Here is a little more info about this swap. I got to ride in one yesterday with an LS1 in it and it is the shiznit setup for an FC. The RX-7's layout and structure is well suited to engine conversions. The rotary engine's eccentric shaft centerline is way up in the center of the rotary engine, dictating a much higher transmission location than that of a piston engine. The rotary engine's low torque output required Mazda to use a very heavy flywheel and a high rear gear ratio, a combination of factors that combined induce large amounts of stress on the RX-7's rear axles and hubs.
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your looking at it the complete wrong way. the "high" centerline of the e-shaft does NOT dictate a higher transmission mount. it dictates a LOWER engine mounting location, which is just another reason dropping an ls1 (or any other piston engine) hurts the cars ability to turn, b/c it raises the vehicles center of gravity. a stock tII does not produce comparably low tq numbers, and why you think engineers used a heavy flywheel b/c of "low tq output", is beyond me. other than being a mating surface for your clutch, an flywheel has no purpose other than to carry momentum, and to smooth power impulses (which is less neccessary in a rotary).
i've never weighed a complete 13b, but ive held most of the main components (rotors, housings, etc..), and im pretty sure that a complete 13b does not weigh 400 lbs. adding that much weight DOES throw off the balance of the car. i said nothing about drifting. im no armchair engineer, and i care nothing about what weight distribution is prefered for drifting. im speaking only of real racing, in which moving the weight forward in an rx7 is in no way beneficial.