Calculated Industries Hot Rod Calc 8703 User Manual page 40

Repeated presses of
outputs, starting with the gear ratio input.
From the above calculation, it is estimated that the mighty 5.0 LX
will be going about 70 MPH at 5,500 RPM in 2nd gear.
In this example, calculate your RPM at 65 MPH in 5th gear:
KEYSTROKES

You will need to find the correct multiplier for 5th gear. Recall that
the final-drive ratio is 3.08 and 5th gear is 0.68.
4. Multiply the final-drive ratio and 5th gear ratio, and enter that as
your Gear Ratio:

5. Enter your cruising speed of 65 MPH:

6. Calculate the RPM:

Repeated presses of
outputs, starting with the gear ratio input.
From the above calculation, it is estimated that the 5.0 LX will be
cruising at about 1,760 RPM while going down the highway at 65
MPH in overdrive, resulting in decent fuel mileage due to a low
load on the 5.0 liter engine.
In this example, you want to solve for performance out on the
highway. The 5.0 LX peaks in torque at about 3,000 RPM. When
you want to downshift from 5th to 4th and safely overtake another
car at the LX's peak torque RPM, what final-drive ratio will enable
the LX to reach 3,000 RPM at 65 MPH in 4th gear? Recall that 4th
38 — H R
OT OD

will toggle through the inputs and

will toggle through the inputs and
C ™
ALC
GEAR S 2.0944 RATIO
SPEED S 65. MPH
RPM 1760.004
DISPLAY
0.