Originally Posted by tom2112

I'll get you, and your little car too! <done in my best wicked witch voice>



But seriously, the math to determine the RPM-based top speed of a Crossfire isn't that complicated.

If the max RPM is 6,200 that means that your flywheel is spinning 6,200 times per minute. Fifth gear in an SRT-6 has a ratio of 0.831, and the differential has a ratio of 3.07.

So, for every 1 rev of the engine, transmission spins the drive shaft 1.203 times (1 / 0.831 = 1.203).

For every 1 rev of the driveshaft, the differential spins the rear axles 0.326 times (1 / 3.07 = 0.326 ).

For every 1 rev of the axle, the wheel spins once, which moves the car a distance equal to the circumference of the tire. The circumference of the _stock_ SRT-6 rear tire is 81.77 inches.

So, when the engine revs at 6,200 rpm, the driveshaft is spinning at 7,495 rpm (in fifth gear), and the rear axles are spinning at 2,432 rpm.

2,432 revolutions of the tire in one minute, would mean 145,920 revolutions in one hour.

145,920 revolutions of the tire would move the car 11,931,878 inches, or 994,323.2 feet, or 188.3 miles.

So the gear-limited top speed of an ECU-tuned Crossfire SRT-6 with stock gears and tires would be 188.3 MPH.

Now, it's a whole other set of figures to figure out how much horsepower the car would have to produce to get there. From my calculations it would require 363.5 horsepower at the wheel to overcome drag at sea level, that does not include roll resistance of the tires, which would vary depending on the driving surface.

So, Montana, are you putting over 364 whp to the pavement? You might just get to 188 mph then.