Re: What is normal RPM at 55 MPH for a 72 Spit?

[Mark J Bradakis <mjb@spitfire.cs.utah.edu>]

You can figure out stuff like this quite easily.  There is a simple
spreadsheet program in ftp.team.net/pub/misc/gear.sc that does things
like figure out mph in various gears.  From the chart below, you can see
that the Killer Spit goes over 90 miles per hour in top gear at redline.
One of these days I might do some 0-60 timing on that car!


     Section Width (mm) >>       225   (These first four lines are user input)
           Aspect Ratio >>        45
Wheel Diameter (inches) >>     13.00
   Wheel Width (inches) >>      8.00
    Section Width (inches)      8.86
   Section Height (inches)      3.99
 Overall Diameter (inches)     20.97

         Rear end ratio >>      4.11   (also user data)

Transmission ratios              1st       2nd       3rd       4th
                        >>      3.50      2.16      1.39      1.00


                                 RPM       1st       2nd       3rd      4th

                             1500.00      6.51     10.54     16.38     22.77
                             2000.00      8.67     14.06     21.84     30.36
                             2500.00     10.84     17.57     27.30     37.95
                             3000.00     13.01     21.08     32.76     45.54
                             3500.00     15.18     24.60     38.23     53.13
                             4000.00     17.35     28.11     43.69     60.72
                             4500.00     19.52     31.63     49.15     68.31
                             5000.00     21.69     35.14     54.61     75.91
                             5500.00     23.86     38.66     60.07     83.50
                             6000.00     26.02     42.17     65.53     91.09