top speed for 4.44 on 18" rim
18-03-2009, 10:36 AM
#2
20K+ Super Poster.
I've covered this before, the above info is nowhere near enough to work this out.
You need tyre size/aspect ratio, top gear ratio, diff ratio(given).
Easy to work out then I put all this up about 1 month ago with all easy calculations.
tabetha
You need tyre size/aspect ratio, top gear ratio, diff ratio(given).
Easy to work out then I put all this up about 1 month ago with all easy calculations.
tabetha
18-03-2009, 10:56 AM
#3
Engine revs x 60, (example 7800rpm, 7800 x 60 = 468000)
then take the tyre revolutions per mile (example 225/40/18 kumho is 812rev/mile)
812 rev/mile x final drive ratio (cossie 5th is .8) x diff ratio (yours 4.44)
so... 812 x .8 x 4.44 = 2884.224.
Then divide one into the other..
468000 / 2884.224 = 162.26mph
then take the tyre revolutions per mile (example 225/40/18 kumho is 812rev/mile)
812 rev/mile x final drive ratio (cossie 5th is .8) x diff ratio (yours 4.44)
so... 812 x .8 x 4.44 = 2884.224.
Then divide one into the other..
468000 / 2884.224 = 162.26mph
19-03-2009, 01:39 PM
#5
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Quaife have a speed calculator that allows you to input the same data: http://www.quaife.co.uk/assets/QSpeedCalc.exe
Charlie
Charlie
19-03-2009, 05:48 PM
#7
They are good for a rough speed but not exact as tyres are different sizes from one manufacturer to another,
You could always measure the circumference of your tyre in mm's and divide it into a mile... 1 mile = 1 609 344 millimeters
then work it into the method above
You could always measure the circumference of your tyre in mm's and divide it into a mile... 1 mile = 1 609 344 millimeters
then work it into the method above
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