Jon,
Two great points! :) Never thought about using a GPS or the effect that not
correcting for the gear ratio change.
Dave Clement
99 SLT+ CC 4x4
In article <dj89ei$mi7$1@bent.twistedbits.net>, jon@dakota-truck.net writes:
>
>
> david.clement@verizon.net wrote:
> : Aaron,
>
> : You have to remember the speedo's up near the top of the scale have huge
errors
> : and they are optomistic so you were not going any where near the indicated
> : speeds. Plus, just to go from 115 to 130 with your 2.5 would require almost
> : doubling the horsepower.
>
>
> Yep, for us "non professionals", using a GPS is probably the
best/cheapest
> way of getting an accurate speed reading.
>
>
> : I am assuming it's a typo when you said 5.13's in the Fury. Assuming a
26-to
> : 28" tall tire that is going to put the rpm in the 7500 to 8100 rpm range.
No
> : 318 2bl will spin those kinds of rpm.
>
>
> Maybe not - it strikes me that if the gears were swapped to 5.13s and
> the speedometer gear in the transmission wasn't corrected, the speedometer
> would read high. If the car were originally equipped with 3.55s and 5.13s
> were swapped in, 118mph indicated would be closer to 80mph. If it originally
> came with 3.91s, then 118mph indicated would be about 90mph. For 4.10s,
> just under 95mph. I don't recall where that 318 would tach out, but assuming
> 6,000rpm with 5.13s and a 28" tire, the speed would be 97mph.
>
> So... This may be completely wrong, but my guess is something
> along the lines of 5.13 gears were installed and maybe the 4.10
> speedometer gear was the max correction the person who did it could
> find, which would mean that 118mph indicated was more like 95mph,
> assuming the 318 2bbl could get to 6,000rpm in third gear?
>
>
> --
> -Jon-
>
> .-- Jon Steiger --- jon@dakota-truck.net or jon@jonsteiger.com --.
> | '70 Barracuda, '90 Dakota Convertible, '92 Ram 4x4, '96 Dakota |
> | '96 Intruder, '96 Kolb FireFly, '99 Cherokee, '01 Ram 3500 |
> `----------------------------------- http://www.jonsteiger.com --'
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