Join Date: Oct 1999
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Still Figuring Gears and RPMs
i've been a tad confused figuring out the rpms before and after the gear swap and tires. my numbers don't really make sense with how the truck was driving. the truck felt really doggy and slow of the line, and i had no clue as to which way my speedo was reading...but other traffic sure passed me right and left! :wall anyway....
according to the calculators:
3.42s + 265s = 1782rpm @ 70mph
ok, that's about right, if memory serves me correct.
then: 3.42s + 33s = 1706rpm @ 70mph
32.8 = 1717rpm @ 70mph
hmmm, why the big discrepancy on my seat-o-meter?
so, theoretically, after gears:
4.10s + 265s = 2136rpm @ 70mph
4.10s + 33s = 2046rpm @ 70mph
32.8 = 2058rmp @ 70mph
i guess my biggest beef is why was the truck such a weeny after going up a tire size. i weighed and measured the two tires. the difference was 1.2" and 5lbs for each tire. the only thing i can think of is i didn't weigh or measure them very good - so i can do that again. i just find it wierd :-?
am i missing something??