Mr. Gasket 8703 Hot Rod Calculator - Manual (Page 45)

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8. Enter your RPM and cruising speed of 65 MPH:

rPM 3000.

sPeed 65.
MPH
9. Calculate the final-drive ratio:

(Final-drive ratio)
Gear
raTio
3.57**

(Manual trans final-drive ratio)
Gr-M
raTio
3.529
 *
(Auto trans final-drive ratio)
GR-a
RatIo
3.582
* Repeated presses of  will toggle through the inputs and outputs,
starting with the entered RPM
.
** It is estimated that in order to reach 3,000 RPM in 4th gear at 65
MPH, the LX will need a final-drive ratio of 3.57. And for the users who
have experience with the Larry Shepard correction method, your calcu-
lator also shows a manual transmission (
Gr-M) final-drive ratio of
3.529 and an automatic transmission (
Gr-a) final-drive ratio of 3.582.
Tire diameter — Based on RPM, Speed and gear Ratio
Instead of changing your final-drive ratio as in the previous
example, you could have solved for the performance another
way – by changing the tire size. Using the known parameters of
65 MPH, 3,000 RPM, and our current final-drive ratio of 3.08,
calculate a new tire size that will give similar results as the final-
drive ratio change in the previous example.
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
0.
1. Enter your RPM, cruising speed of 65 MPH and Gear Ratio:

rPM 3000.

sPeed 65.
MPH

Gear
raTio
3.08
2. Calculate the New Tire Diameter:
 *
(New Tire Dia)
Tiren
siZe
22.431
in
**
(cont'd)
UG8703E-B-inside.indd 43 3/3/2010 3:03:59 PM