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Old 02-24-2009, 04:59 PM   #1
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Default Ring and Pinion Speed Calculator

Ive been searching for it and can't seem to find it...


Someone a while ago posted a ring and pinion excel calculator that would let you input the information and it would tell you the max speed in gear @ redline.


If not, I have a 94' with stock open and a dead tach and need to use my speedo as a tach temporarily. So speed to rpm with my open (I think it was 4.10) @ redline would be much appreciated, excel even better however.
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Old 02-24-2009, 10:10 PM   #2
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Here, I just wrote one in Excel that's Miata-specific. Enter your R&P ratio and tire diameter (in inches) the green boxes. Get the tire diameter from the manufacturer's datasheet. It's pre-loaded with the standard transmission gear ratios for a 5-speed, and the MPH comes out for each gear in 500 RPM increments in the yellow box.
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File Type: xls Miata Gear Calculator.xls (17.0 KB, 488 views)
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Old 02-24-2009, 10:28 PM   #3
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Quote:
Originally Posted by Joe Perez View Post
Here, I just wrote one in Excel that's Miata-specific. Enter your R&P ratio and tire diameter (in inches) the green boxes. Get the tire diameter from the manufacturer's datasheet. It's pre-loaded with the standard transmission gear ratios for a 5-speed, and the MPH comes out for each gear in 500 RPM increments in the yellow box.
You are a god good sir.
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Old 02-24-2009, 10:45 PM   #4
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Get the tire diameter from the manufacturer's datasheet.
Or you can put in the wheel size here Tire size calculator
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Old 02-24-2009, 10:51 PM   #5
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This is the best one yet, from our friends at FM.

Flyin' Miata : Technical info : Gearing calculator
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Old 02-24-2009, 11:00 PM   #6
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I re-did the sheet in 250 RPM increments, in case you need some extra resolution.

Also, be aware that the values which the tire calculator Artie posted are "nominal" values. Actual diameter will vary slightly between different tires of the same stated size, not just between brands, but even for different tire models from the same brand. To get the exact OD for your particular tires, you can either measure them with a cloth tape (of the sort used by tailors), or download the specs from the manufacturer's website.
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File Type: xls Miata Gear Calculator R2.xls (21.5 KB, 164 views)
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