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| best odometer/speedo correction device ? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=3&t=27074 |
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| Author: | fasthid [ Fri Nov 30, 2007 4:57 pm ] |
| Post subject: | best odometer/speedo correction device ? |
It's time for bigger tires on our 4x4 '04 KJ, going to 245/75-16's from 235/70-16's, have an auto trans, 3.73 gears, and we want to keep the odometer accurate, helps following trail maps, and also the speedo too. anyone successfully corrected their speedo/odo themselves? 
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| Author: | q50055 [ Fri Nov 30, 2007 6:28 pm ] |
| Post subject: | |
yes I do it myself, with the stock tires I mentally reduce indicated speed by 5% (actually drive 5% faster). The MTRs are pretty accurate. 
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| Author: | fasthid [ Fri Nov 30, 2007 6:35 pm ] |
| Post subject: | speedo correction device |
oh, I meant I want a device to install to correct the speedo/odo |
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| Author: | FreeJeep [ Fri Nov 30, 2007 9:14 pm ] |
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Took mine to the dealer and they did if for free. Took 2 mins. DonC |
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| Author: | fasthid [ Fri Nov 30, 2007 9:18 pm ] |
| Post subject: | |
wow, for free? any clue as to how they did it? my dealer took 2 mins to program a spare key for me and after they already got me for $50 for the key, charged me $80 for the 2 minutes, or about $2400 per hour shop rate |
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| Author: | myjeepwalks [ Fri Nov 30, 2007 10:31 pm ] |
| Post subject: | |
q50055 wrote: The MTRs are pretty accurate.
same here, i'm within 1-2 mph |
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| Author: | DarbyWalters [ Fri Nov 30, 2007 11:05 pm ] |
| Post subject: | |
The odometer has been off since you got your KJ
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| Author: | ryno [ Fri Nov 30, 2007 11:27 pm ] |
| Post subject: | |
My speedometer was off about 2 mph at highway speed with the stock 235/70/R16 tires. After switching to 245/70's, the speedometer is spot on, GPS-proven. |
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| Author: | tjkoen01 [ Sat Dec 01, 2007 12:29 am ] |
| Post subject: | |
I made the same tire change you did. i bought the jet accuspeed thingy....i haven't gotten it to work yet and I'm not feeling to good about it. before i bought it i took it to my favorite dealer and they were going to charge me $90 so i bought the jet accuspeed. |
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| Author: | FreeJeep [ Sat Dec 01, 2007 10:06 am ] |
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spacomponents wrote: wow, for free? any clue as to how they did it?
my dealer took 2 mins to program a spare key for me and after they already got me for $50 for the key, charged me $80 for the 2 minutes, or about $2400 per hour shop rate Was a while ago, but I think I just gave them the actual diameter of the new tires and they hooked it up to a little portable scanner lookin thing and updated the program. |
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| Author: | itsajeepthing [ Sat Dec 01, 2007 10:11 am ] |
| Post subject: | |
Curious, how accurate are speed indications from GPS? |
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| Author: | Eddo [ Sat Dec 01, 2007 10:24 am ] |
| Post subject: | |
itsajeepthing wrote: Curious, how accurate are speed indications from GPS?
Much more than any mechinal speedometer. |
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| Author: | csukoh78 [ Sat Dec 01, 2007 12:29 pm ] |
| Post subject: | |
current GPS technology can maintain speed and distance to around +/- 0.1mph and +/- 0.5 meters. |
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| Author: | LostRenegade [ Sat Dec 01, 2007 3:57 pm ] |
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The dealer needs to reprogram the tire revolutions to correct the spedo and fuel economy gauges. I had several dealers tell me that it could not be done, several that would charge for a full hour of labor. I finally found one that wasn't sure, but would try it. They charged me for only a 1/4 hour of labor even though it took them a while to figure it out. I am running 245/75/R16 MTRs and my GPS is about 0.5 to 1 MPH off. |
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