If you race a stock 6 speed 13b-msp rx8 and a 1jz rx8 in a straight line obviously the 1jz would win but around a bendy track the 13b would win because of the weight which is devided 50% back and 50% front.
Do you have any idea about the weight difference between a 13b-msp and a 1jz?
13b-msp : 122kg (unmodified)
1jz : around 230kg and thats without trans
The people at mazda who designed the rx8 arent stupid they did the 50 - 50 weight split because that was appropriate for the car it would cause less wear on specific parts on the car.
And yes i also know about the traction problems and bump steer you get .....from a 1jz rx8
I have a car with 1jz-gte and guess what its not a rx8