Turn in and weight aren't directly comparable, it has more to do with the suspension setup (sway bars, rigidity, tires, and just overall suspension dynamics from the factory). In general, lighter cars do accel, but there are heavier cars that handle quite well. Remember, there are always exceptions to the rule. Matter of fact, I'd bet that my all aluminum engine isn't too much heavier than that of a larger four banger with an iron block. Not really engine weight as much as it is the suspension stuff I mentioned above as well as where the engine is located in the car (front of front axle, over it, behind it, mid engine, rear engine). Look at a car like a McLaren or Lambo or Ferrari or anything, looking at V12 cars and some of the best handling cars out there, or even a BMW M5 (V8) and cars of the like. Engine size, weight, and vehicle weight aren't all there is to handling.
Erm, this one i really must disagree. Also, I think I know a thing or two about handling, and what the characteristics of the car would be like if the engine were placed either in an FF, MR, FR or RR setup.
You mentioned the Mclaren... do you know just how much engineering has gone into the car to make it as light as it is? I don't, but I think it's prolly toomuch for the average joe like me to grasp fully.
Many MANY times in Japan as well as Korea, tests have been performed with Jap cars (stock) and European supercars. Yes, the ferrari F50 IS as fast as what people think, maybe even quicker. F40 too. The GT2 is a monster.
Sadly, the 500HP diablo isn't what it's cracked up to be. SUre, slalom figures say they are good handlers, but in reality, they're not that awesome a car to race in. Same goes for murcielago. Fuji speedway, you see it struggling and swapping positions with an NSX.
Ok, just to tell you how important being light is in a race: a motorsport elise wiih a 4 pot and 200BHP has the potential to stay RIGHT behind a Corvette in the nurburgring (except for the straightaway).
Being nose heavy has got EVERYTHING to do with handling. A 180SX, with a stock engine, sure it's not that powerful, but handles very well, drifting effortlessly. THe nose, as you want it to, will understeer then oversteer just enough to get the show on the road.
Now, on the same car, a skyline engine (RB26DETT)was dropped in. Sure, lots more power, but what happens to turn in? Like trying to turn quick on ice. Being nose heavy is also the primary reason why there's so much more wear on the front tires, and this is REAL bad news in a race.
I have not had the opportunity to see american cars go head to head over here (there aren't too many of them around, and the owners are neither professional racers, nor are they willing to allow professionals to race them), but if i had to chance to try an american car with a V8, with an all aluminum block as ou descried, i can give a more detailed comparison about it. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif