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Registered
Join Date: Jul 2009
Location: Nova Scotia
Posts: 533
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Gear Ratio Calculator
I have a non-stock ring & pinion and would like to reproduce a chart similar to the one pictured. I'm assuming that this is a printout from an excel spreadsheet. Does anybody have a link to a gear ratio calculator. This one includes tire diameter which I think is critical.
This chart also would give a good indication of effect of tire size on actual speed vs speedometer reading. 
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08-06-2010, 07:36 AM
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Tinkering Pays!!
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__________________
LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR. |
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08-06-2010, 08:29 AM
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Registered
Join Date: Jul 2009
Location: Nova Scotia
Posts: 533
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Thanks.
Anybody know of any others . I'd like to cross reference at least two just to be sure calculations are accurate. |
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08-06-2010, 09:52 AM
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R.I.P.
Join Date: Aug 2009
Location: Nicholson, Ga
Posts: 2,160
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it's simple math.
speed x 336 x final drive ratio / tire diameter = rpm |
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08-06-2010, 11:29 AM
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Registered
Join Date: Jul 2009
Location: Nova Scotia
Posts: 533
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hmmmmm...
tire diameter x rpm / 336 x final drive ratio = speed what is the 336? |
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08-06-2010, 11:46 AM
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R.I.P.
Join Date: Aug 2009
Location: Nicholson, Ga
Posts: 2,160
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The constant
120mph x 336 x 2.63 (4th gear x R&P) / 24.5 (tire dia) = 4328 rpm |
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08-06-2010, 03:02 PM
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Tinkering Pays!!
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Quote:
__________________
LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR. |
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08-06-2010, 03:56 PM
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R.I.P.
Join Date: Aug 2009
Location: Nicholson, Ga
Posts: 2,160
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haha, I can't take the credit for that. Hell I had to forget 3 things of mid level importance just to remember that formula
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08-06-2010, 05:58 PM
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Porsche 930
Ford Truck
