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| peaandham |
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Ok so i got some new tyres fitted some time ago to my EB II and i got done for speeding the other day and i know my car is going slower than what the speedo is saying how do i find out how much slower it is going with the new tyres compared to stock?
This is a program i use to help me http://www.miata.net/garage/tirecalc My new tyres are 215/65 or 60/ R14 something like that, all i know is they are on the Door Card of my EBII
_________________ OLD CAR: EB II Falcon, Everglade Green, 250thous (Rough Guess), Wildcat Extractors, 2.5 Exhaust with Muffler + Hot Dog, 18 Inch Rodney Jane Mags, XH Snorkel, EA MPEFI Tubing ! |
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| cjh |
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I use an actual one........tyre diatmeter in inches X rpm ( ie 2,600rpm becomes 2.6 ) X 3 ( constant)
___________________________________________________________ Diff ratio X Gerabox ratio. Equals.......speed in MPH........times this by 1.61...= KMH. 26.1" X 1.8 X 3 = 140.94. Diff of 3.08 and 3rd on 4sp auto is 1:1. so 140.94 divided by 3.08 = 45.759 MPH X 1.61 = 73.673Kmh.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| pugsley |
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i use a gps. This is the best method i have found
_________________ EF GLi Wagoon |
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| phil545 |
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awesome little program, just tried it out, my speedo will say im going faster than i really am with my new rims and tyres (0.4% to fast )which is always a good thing.
_________________ I hate arriving at my destination as then I have to get out of my car! |
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| jonathon |
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http://www.miata.net/garage/tirecalc
if going by this my speedo is 0.6% to fast so when my speedo is sitting on 100 kph i am actually doing 99.4 kph
_________________ Owning 1 of 84,847 ebII. |
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