I need the formula to find what RPM I'll have with a certain tyre size...
Search found this "RPM = km/h divided by 1.6 x gear ratio x 336 divided by tyre dia.".... What is 1.6 and 336?
My overdrive - 0.696:1 Final ratio - 4.11. I need about 2000RPM @ 100km/hr
Thanks in advance for the formula.
Dave.
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Ratio Question
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Ratio Question
Because I can...
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Smoking after sex causes pregnancy.
It's hard to be serious when you're naked.
Be around 29.9" or 759mm.
RPM = ( Gear ratio x T-case Ratio x Final drive ratio x RPK x SPD)/60
RPK : Tyre revs per km
SPD : Speed in km/h
RPK = (60 x 2000)/(0.696 x 1 x 4.11 x 100)
RPK = 419.5
RPK = 1000000/(Tyre Dia. in mm x 3.142)
Tyre Dia. = 1000000/(419.5 x 3.142)
Tyre Dia. = 759mm or 29.9"
There is also a tyre slippage factor at play which you could also take into account if you wish of around 3%.
RPM = ( Gear ratio x T-case Ratio x Final drive ratio x RPK x SPD)/60
RPK : Tyre revs per km
SPD : Speed in km/h
RPK = (60 x 2000)/(0.696 x 1 x 4.11 x 100)
RPK = 419.5
RPK = 1000000/(Tyre Dia. in mm x 3.142)
Tyre Dia. = 1000000/(419.5 x 3.142)
Tyre Dia. = 759mm or 29.9"
There is also a tyre slippage factor at play which you could also take into account if you wish of around 3%.
[quote="4WD Stuff"]
I haven't quoted Grimbo because nobody takes him seriously :finger: :finger: :finger: :finger: [/quote]
I haven't quoted Grimbo because nobody takes him seriously :finger: :finger: :finger: :finger: [/quote]
this link is pretty helpful as you can quickly look at all gears and the effects at different speeds
http://www.grimmjeeper.com/gears.html the only downside is you need to convert from mph to kph but I am sure your capable of that
http://www.grimmjeeper.com/gears.html the only downside is you need to convert from mph to kph but I am sure your capable of that
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