4bangerjp.com
General Forums => The Mess Hall => Topic started by: sharpxmen on November 22, 2013, 11:11:09 PM
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so i had 33'' tires and 4.88, by all calculations should have been very close to the factory impulse/mile rate with the stock speedo sender gear. I have measured the speed at the time and found that the speedo was showing about 6% more than the gps, never thought to check the odometer, i assumed it was showing more by the same amount. I just put new 35'' tires on and the speedo is pretty much on the money, (speedo=100kph, gps=99kph). Just out of curiosity i reset the trip on the gps and it turne out that 40.6km on the odo is actually 42.4km according to the gps (that's 4.4% more than what the odometer measures). I'll be using this correction factor as my mpg calculation. i'm kinda pleases that the speedo shows the correct amount although for the PCM would be nice to have the proper impulses/mile rate (dunno if it actually makes a difference though).
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Interesting. Pretty strange that speedo and odometer don't match.
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Interesting. Pretty strange that speedo and odometer don't match.
i measured the odo on the hwy today, it's 4.8% off acording to the milestones, gps is sometimes inaccurate when it comes to trip total, but i'll probably doublecheck this on a longer trip (was only about 20 miles or so not long enough for a good estimate).