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i am trying to calculate my engine speed based on my gps datalogs. when i put in all the data like wheel size, road speed, gear ratio and diff ratio,
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09-19-2011, 12:24 PM
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#1 (permalink) |
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A True Z Fanatic
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Location: californee way
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engine speed / gears / road speed
i am trying to calculate my engine speed based on my gps datalogs. when i put in all the data like wheel size, road speed, gear ratio and diff ratio, the rpm is always off by 500 rpm. anyone know what it could be? is our gauge that far off in terms of revs or is the gear ratios incorrect or is it my gps
here is what i used 2nd gear limiter is 69.4mph final drive is 3.446 2nd gear ratio is 2.324 tire size is 26.8 as i have 285 35 19 what do u guys think |
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09-19-2011, 03:52 PM
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#2 (permalink) |
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Enthusiast Member
 
Join Date: Mar 2011
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Final drive on 6MT is 3.692 according to the spec sheet. Or do you have some other gearset in yours?
Also tirerack is telling me 26.9" for that size tire, but that's just a tiny difference, and if your tires are worn at all your value is probably closer. 
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09-19-2011, 03:54 PM
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#3 (permalink) | |
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A True Z Fanatic
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Quote:
Edit* just saw you added the table. 
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09-19-2011, 04:06 PM
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#4 (permalink) |
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A True Z Fanatic
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It is spot on when I calculate it - using the 3.692 ratio.
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09-19-2011, 04:10 PM
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#6 (permalink) |
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A True Z Fanatic
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BTW 3.446 is reverse, which means you can do 47 mph going backwards!
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09-19-2011, 04:36 PM
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#7 (permalink) | |
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A True Z Fanatic
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Location: Northern VA
Posts: 55,385
Drives: on two wheels
Rep Power: 6962 |
Quote:
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