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Author Topic: Speedometer  (Read 1168 times)
jacmac
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« on: March 14, 2011, 06:46:33 PM »

What would be the difference in the speedometer reading going from a 307 to a 355 rear axle ratio??
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69 Z10,72 corvette
Ed Bertrand
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« Reply #1 on: March 14, 2011, 10:03:33 PM »

Too many variables. You need to know the tire diameter, the RPM's you going and the gearing of the transmission. HERE'S a nice little calculator you can use that'll give you several readings with different ratios.

Ed
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9T4Z
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« Reply #2 on: March 15, 2011, 06:37:07 AM »

.305/.357 = .85  If my high school math still works your speedo will read about 15% lower.
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Gary 9T4Z

94Z rag blower 491 rwhp (now 505!)
69 Pace Car, 70RS,91Z,91RS
jacmac
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« Reply #3 on: March 15, 2011, 06:38:26 PM »

Thanks for the help guys.Ill figure it out!
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69 Z10,72 corvette
tom
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« Reply #4 on: March 16, 2011, 08:54:27 PM »

Got a GPS ?  Go for a ride and see how far off you are. My old Honda read about 10% slow after I changed the tires. Never fixed it, as it was easy math.
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69 X11 Z21 L14 glide
looking for a 69 export model (KPH) speedo
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