Originally Posted by Tech
Funny that GM put the MN12 in there to make the car seem more like a track car. Then, the track guys take it out in favor of the Coupe transmission. Are the guys doing the swap still around the same power level as stock?
YES. the Zr1 gear ratio ( modeled after the GM Motorsports gear box) would be the ideal choice for a road course with a 3.73 or 3.90 gear.
On the ZR1 it is also very good, but north of 580 to the ground, that is wheel speed or could be in each gear
Hell I only run 400 to the ground and I can wheel speed in 3 gears.
the MN12 was to get better Zero to 60 times, the MN12 3-4 is a great combo, but the 2-3 is too much of a jump.
part of the other challenge is with the MN12, 3rd is too high for many low speed corners,but 2nd is too low, where the mn6 3rd is just a better gear for many corners.