Quote:
Originally Posted by sjgrimsley
The 4L60 has a 3.06:1 1st gear and the 6L80 has a 4.03:1 1st gear. For a reference, the C6 08+ Corvettes with the 6L80 come with a standard 2.56:1 ratio or an optional 2.73:1 'performance' ratio.
With the torque this 406 already makes, I am tempted to try the 2.56:1 rear with the current 4L60 trans.
And these are C5 Z06 replicas 17"x8.5" front, 18"x9.5" rear. I have them to clear the future brake upgrade. The factory wheels won't clear the front rotors I'm looking at getting.
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I think that your wheels and tires are going to ruin your chances for 28-mpg.
The TA originally had 205mm rubber,the MOON-esque wheel covers,and the rear spoiler,for Cd 0.315.
With John Shinella's secret wheel covers and narrower tires (195s),the drag could be Cd 0.283.
*The original airdam was too low to begin with,but WAS optimized aerodynamically.
*The side skirts were optimized as well.
*The 'widening' of the C7 Corvette,with the Z06 package degrades the Corvette's drag ,from Cd 0.29,to Cd 0.37.
*Your TA already has a frontal area challenge compared to the 'Vette.
*If you were to have a chance at the mpg,my opinion would be that you'd have to lose the wheels and tires and restore the car to stock spec,and add "narrower" rubber.
*I don't know how you'll be able to keep the airdam on the car.North Texas streets are littered with the originals.Same for the Corvettes
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