Does this sound right? - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 06-30-2009, 08:36 PM Thread Starter
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Does this sound right?

So I am messing with my SCT Tuner.... and I get to where I have to adjust my speedometer and it goes by rev's per mile and I Running a 40x15.50R22 Toyo Open Country M/T and i was trying to figure out all the numbers and I came up with the truck did 658.2 on the stock tires and with the 40's it is doing 524.1.... does this sound correct?

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post #2 of 10 Old 06-30-2009, 08:43 PM
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I got 504.025 revolutions per mile with the 40's. I may be wrong.

40 x 3.1427 (tire circumference in inches) = 125.708
5280 (feet in mile) x 12 = 63360 (inches in mile)
63360 / 125.708 = 504.025 rev/mile.

Make sense or am I missing something?

Nick, BPS Historian
1995 F-250 4x4 7.3 Powerstroke
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post #3 of 10 Old 06-30-2009, 08:47 PM Thread Starter
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yeah but try the equation with the actual tire size from toyo's website.... 39.7

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post #4 of 10 Old 06-30-2009, 08:50 PM Thread Starter
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with that equation I got 508.1

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post #5 of 10 Old 07-01-2009, 04:25 AM
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This is where I go to calculate my revs per mile: Tire size calculator

It works with the metric system. If you have your tire size in the standard system, just figure the metric values first with this calculator and then go on to determine your revolutions per mile with the above calculator.

Metric Tire Conversion Calculator - Red Rock 4x4

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post #6 of 10 Old 07-01-2009, 04:30 AM
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I did it for you...

504...

2012 F-350 SRW King Ranch
SOLD - 2004 Lariat F-250 4x4
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post #7 of 10 Old 07-01-2009, 04:43 AM
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most tire sites have the revs per mile on the page with their tire specs...Toyo lists that tire as 522 revs per mile

"have not shot the gun yet but will next week when we see the mother in law." Quoted from a gun forum!

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post #8 of 10 Old 07-01-2009, 07:55 AM Thread Starter
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well then.... I am just going to plug in what Toyo says then... do you have a link to that page on their website?

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post #9 of 10 Old 07-01-2009, 08:04 PM
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here you go... http://toyotires.com/tires/suv-and-truck/full/OPMT/96

"have not shot the gun yet but will next week when we see the mother in law." Quoted from a gun forum!

2004 CC 6.0 4x4 lariat

MODS: BPD Remote Oil Cooler, MTW Stage 1, GoGo Diesel Direct Drive Soleniod, Swamps 58v FICM, ARP's, Sinister EGR Delete, SCT XCAL3 w/DJ's Looney, Dfuser coolant filter, 4" straight pipe, Ranch Hand, Tuff-Country Level Kit, Isspro Boost/Trans Temp/Fuel Pressure/Pyro gauges, Edge Insight CTS...
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post #10 of 10 Old 07-01-2009, 08:17 PM Thread Starter
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Thank you... I had the choice between 520 or 525 so I picked 520... hopefully my speedo will be correct....

for anyone with huge tires... this thing will adjust up to 46" or 48" I'd have to do the math, i highly suggest the SCT Livewire to anyone for its options and adjustability

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