Changing diff ratio

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Formula:

For what it's worth. Below is a formula to use that might save you $$$$
To get M.P.H. divide K.P.H. by 1.6 example (96KPH=60MPH)
At 60 MPH, x Axle ratio x 336/Tyre Diameter = R.P.M.@60 M.P.H
THEREFORE 60 X 2.18 X 336 / 24 = 1831 R.P.M.
RATIO: Equals tail shaft turns, to one revolution of wheel.
DIAMETER = Measure tyre height from top to ground with tape.
Listed below, examples of R.P.M @ 60 M.P.H (96K.P.H) 
Diff Ratio vs Tyre Diameter
Diff Ratio 24" 26" 28" 30" 32" 34" 36" 38" 40" 42"
2.18 1831 1690 1570 1465 1373 1293 1221 1157 1099 1046
2.50 2100 1938 1800 1680 1575 1482 1400 1326 1269 1200
2.74 2301 2124 1973 1841 1726 1625 1534 1454 1381 1351
3.08 2587 2388 2218 2070 1940 1826 1725 1634 1552 1478
3.23 2713 2504 2326 2170 2035 1951 1809 1714 1628 1550
3.50 2940 2714 2520 2350 2205 2075 1960 1857 1764 1680
3.73 3133 2892 2686 2507 2349 2212 2089 1979 1880 1790
3.90 3276 3024 2808 2621 2457 2312 2184 2069 1966 1872
4.10 3444 3179 2952 2755 2583 2431 2296 2175 2068 1698
4.56 3830 3536 3283 3064 2873 2704 2554 2419 2298 2189
4.88 4099 3784 3513 3279 3074 2894 2733 2589 2460 2342  
Might be something for all to use. It will give you a guide as to what your Revs will be.
Knowing Diff Ratio & Tyre Size, at a given speed.
Without taking your vehicle for a run & no tachometer required. Hope it helps,
Cheers, Jacks. --59.167.102.56 15:01, 24 Nov 2005 (CET)


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