Date: Fri, 4 Jul 1997 10:45:35 +0000
Sender: Vanagon Mailing List <vanagon@vanagon.com>
From: vwbus@netbiz.net
Subject: Re: Formula for calculating speed w/given gear ratios
--Message-Boundary-24741
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> I know there's someone out there with a handy dandy formula for calculating
> top end for different gear ratio's and rear ends. This is for my `82 Westy
> Diesel. Anyone?
I though this one out a while back basiclly speed in mph
speed = (desired RPM * 60) * (circum tire in miles)
----------------------------------------------
(gear ratio) * (final ratio)
so say at 3500 RPM for a diesel with a 5.43 final and in 4th (.87?)
speed = (3500*60*.00127)/(5.43*.87)=56.5 mph
oh circumference of tire in miles
circ (in) = [ (width * percent sidewall series * 2) + wheel size ]
------------------------
25.4
circ (miles) = (circ (in)) * Pi
-----------------
(63360)
or for a 185 (80) R 14
circ (in) = (185 * .80 * 2)/25.4 + 14 = 25.65 in
circ (miles) = 25.65 * 3.1416 / (63360) = .00127
These of course are theoretical estimates, actual tire size will vary
by brand, I think these formulas are roughly correct but can not be
held responsible for my own idiotic mistakes.
Attached is a 123 sheet that calculates for different RPM's and gear
ratios speed at RPM. The ratios are across the top of the columns,
final ration on top, tire size on top right.
John
vwbus@netbiz.net
--Message-Boundary-24741
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