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Registered
Join Date: Feb 2004
Posts: 81
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Speedo error
Does anyone know the speedo error that putting 195 50 15 tires will impart on a stock four cylinder 914 speedo? It is probably about 10% or so maybe?
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05-01-2012, 05:11 PM
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I have a link to a web page with a calcalator for that somewhere. I'll try and find for you.
Found it: http://www.dakota-truck.net/TIRECALC/tirecalc.html Enter sizes into "tire A" and Tire B" then hit compare. It'll show a chart with speedo adjustments Last edited by BobbyQ; 05-01-2012 at 05:49 PM.. |
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05-01-2012, 05:43 PM
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914world has a super sweet calculator too... but its down...
__________________
1973 - Porsche 914 - Black - Dead 1973 - Porsche 914 - Silver - AXer 1974 - Porsche 914 - Olympic Blue - Dead 1974 - Porsche 914 - Ice Green Metallic - Fair Weather driver 2008 - Subaru Forester - Blue Metallic - Bad Weather Driver |
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05-01-2012, 05:52 PM
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Registered
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,706
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You can download my GEARS application program from the site here in the tech articles section. It takes gear ratios (as decimal), final R&P ratio (as decimal) and the tire revolutions per mile OR Roll Out which is most accurate and the slider gives speed and RPMs in each gear.
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05-01-2012, 06:46 PM
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1974 Porsche 914
Calypso
Apollo
