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Math question

Ok here it goes, knowing your tire size, your engine rpm, your trans drive gear, and your final rear end drive gear, how do you throw those together to get your final potential speed?

I tried rpm/trans gear/drive gear*tire size in inches/the number of inches in a mile* 60(the number of minutes in an hour since its rpM). What am I doing wrong, or not seeing right?

I found calculators on the internet for it which work great, but I want to be able to do the math myself, without having to run for a computer. $5.00 Solar crappy calulator, maybe.

Brian

Reply to
Led Sleddin'
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what website did you use? I don't know the formula, but maybe we can jack it from the JS in their pages :-)

Travis

Reply to
Travis Thompson

I can send you a Excel spread sheet and you can steal it from there.

Al

Reply to
Big Al

it s RPM= MPH x GR x FTR x 336 / TD

RPM = well RPM MPH = well MPH you want to see the rpm at GR = gear ratio FTR = final trans ratio if you are going to using overdrive

336 = magic number for it to work out right TD = tire diamter

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Reply to
Mrrjjdh03

MPH=Tire Radius/168 * RPM/Gear Ratio RPM=168 * Gear Ratio * MPH/Tire Radius Gear Ratio= Tire Radius * RPM/168/MPH Tire Radius=168 * MPH * Gear Ratio/RPM

Bird79

1979 Firebird Esprit 1973 455 YC
Reply to
Fa21Nov

Dang, thanks for all the replys. :)

Reply to
Led Sleddin'

Make sure the tyre size is the tyre's circumfence and NOT its diameter or radius. If you use a radius, you will need an additional 2 * PI in there.

ALSO: tyres slip at high speed. And I believe that they slip a lot. Over 10% I believe.

Bram

Reply to
Bram Stolk

Now let me get this straight, you measure the outside diameter of your tire, then multiply by the girth of your girlfriend's ass, minus her squat height, then figure-in her heffer donut needs for a month, and finally add how big her gut is after she japped you with 2 or 3 brat kids-- and that gives you the size of your blue balls at this point, right?

Reply to
F Fletch

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