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2011-2014 Mustangs
How-To
Correct Speedo After Gear Swap
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<blockquote data-quote="FiveLeeter918" data-source="post: 15391873" data-attributes="member: 86065"><p>Useful math problem...</p><p></p><p>Go into the tune and verify that the rear gear ratio is correct for what you have. Also write down the current tire revs/mile.</p><p></p><p>Use phone's GPS and get to 60 mph (on your car speedo) on a safe road. Look at GPS to see actual speed. </p><p></p><p>Needed Revs/mile = (revs/mine in programmer) * (gps speed)/(speedo speed)</p><p></p><p>You'll find that the number it gives is typically a good deal higher than what you thought.</p><p></p><p>Reload tune, then go for a drive a verify. If additional changes are needed, you might need to rerun the problem.</p></blockquote><p></p>
[QUOTE="FiveLeeter918, post: 15391873, member: 86065"] Useful math problem... Go into the tune and verify that the rear gear ratio is correct for what you have. Also write down the current tire revs/mile. Use phone's GPS and get to 60 mph (on your car speedo) on a safe road. Look at GPS to see actual speed. Needed Revs/mile = (revs/mine in programmer) * (gps speed)/(speedo speed) You'll find that the number it gives is typically a good deal higher than what you thought. Reload tune, then go for a drive a verify. If additional changes are needed, you might need to rerun the problem. [/QUOTE]
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How-To
Correct Speedo After Gear Swap
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