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08-12-2011, 10:24 AM
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#1 |
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Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
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RPM Calculator
This is the best RPM Calculator that I have found on the internet. Fun to play around with and enter various gears and tire sizes. It helped me determine Which rear ratio, transmission, and tire size to go with...
http://www.chevellestuff.com/tools/rpm_calculator.htm For example... Old Setup: 275/60/15 tires + TH350 transmission + 3.08 Rear @ 70mph = 2600 RPM New Setup: 275/60/15 tires + 700r4 transmission + 3.73 Rear @ 70mph = 2194 RPM
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2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free  1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) Last edited by veinbar; 08-12-2011 at 10:32 AM. |
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08-12-2011, 10:59 AM
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#2 |
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Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: RPM Calculator
Here's another gearing calculator build for dodge cars that I sue alot
http://www.squirrelpf.com/gearingcalc/index.php this is another cool one for comparisons http://www.fatboyraceworks.com/gears/index.php
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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08-13-2011, 03:42 PM
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#3 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 5,014
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Re: RPM Calculator
Several years ago I made an Excel sheet that calculates RPM & Speedo gears based on tire size and axle ratios.
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08-15-2011, 10:11 AM
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#4 | |
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Registered User
Join Date: Mar 2007
Location: Austin, TX
Posts: 292
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Re: RPM Calculator
Quote:
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2008 Yamaha Zuma 50cc - Daily Driver 1979 Chevrolet Bonanza SWB; 357ci, TH400, 3.73 Posi - Daily Driver 1976 Chevrolet Sport Van SWB; 355ci, TH350, 2.73 Open - Rape Free 1972 Oldsmobile Cutlass S; 455ci, TH400, 2.73 Open - SOLD (but I still claim to own it from time to time) |
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09-14-2011, 06:10 PM
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#5 | |
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Moderator
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 5,014
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Re: RPM Calculator
Quote:
I'd put an unmolested copy in a safe place before you change any values. All of the Blue and Red numerals can be changed by hand without affecting formulas. You can hand enter the tire diameter in inches but it will overwrite the formula in that cell. The speedometer driven gears are automagically calculated from the tire diameter and the axle ratio. Enjoy. |
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09-14-2011, 06:21 PM
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#6 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,469
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Re: RPM Calculator
4lo.com is better, can factor in crawl ratios....
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS |
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09-14-2011, 07:43 PM
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#7 | |
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Moderator
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 5,014
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Re: RPM Calculator
Quote:
 All green rows have the splitter engaged... "1S" is 1st gear with a range splitter. The Low Range Table has RPMs with the transfer case in low range. Try changing Cell D10 from 1 to the Klune V Extreme Gear Splitter ratio of 4.1 |
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Linear Mode
