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#1
08-22-2001, 10:07 PM
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Gear Change/rpms?????
IM RUNNING 3:21 GEARS WITH 255X70X15 TIRES. IF I CHANGE TO 3:90S HOW MANY MORE RPMS WILL I BE TURNING AT 70 MPH. IM TURNING 2900 RPMS AT 70 NOW. SHOULD I NOTICE A LOT OF DIFFERANCE OFF THE LINE? THANKS IN ADVANCE. RAM318
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#2
08-22-2001, 10:51 PM
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GO TO WWW.PRESTAGE.COM THEY HAVE AUTOMOTIVE MATH CALCULATORS FOR MANY QUESTIONS.
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#3
08-23-2001, 09:40 AM
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Simple mat shows that you will be turning about 3523 RPMs at 70 MPH
New gear ratio/old gear ratio times RPM at specific speed will give new RPM at same speed. 3.90/3.21 = 1.215 1.215 x 2900 = 3523.5 Don't forget to change the speedometer pinion as well, otherwise the speedo will be fast. To get the correct speedo gear, use the following: old gear ratio/new gear ratio times number of teeth in curren gear (last 2 digits of PN). This example will use a 28 tooth gear. 3.90/3.21 = 1.215 1.215 x 28 = 34.02 or a 34 tooth gear.
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