I bought my 2000 tj used from a broker. It came with 30x9.5 tires. Is there a way to determine if this was the original size tire from the factory so I know where to start from when changing the odometer gear?
TIA JD
2K-TJ
"There are some simple truths...And the dogs know what they are." Joseph Duemer
Ok, what's right. the door sticker list the original tire size at P215/75R15 .. When I called a local dealer and gave them the Vin# he said P225/75R15.
JD
2K-TJ
"There are some simple truths...And the dogs know what they are." Joseph Duemer
The owners manual to my GPS says that the groundspeed on my GPS will not always be accurate:
"For security reasions, the U.S. Government introduces small errors(selective availability)which can affect positioning information. These errors are most noticeable while viewing speed, heading, and elevation."
Now, I know you're in Canada, but don't you guys use the same satellites as us for GPS purposes?
-- Old Crow '82 Shovelhead FLT 92" 'Pearl' '95 Jeep YJ Rio Grande ASE Certified Master Auto Tech + L1 TOMKAT, BS#133, SENS, MAMBM, DOF#51
I had thought that the US gov't had declassified the GPS offset thing. Basically that they had turned off the function that causes inaccuracies. If it's still on now...well....I've been able to get 3m accuracy which seems to me to still be pretty good. Any small warhead would still do damage if it was 3m off!! So I dunno!!
We use the same network of GPS satellites. I'm not sure of the "spacing" of them but I don't think we use the same sat in the Yukon that someone in florida uses. Isn't there like 30 sats for gps?? I know that towards the poles, sometimes there's not enough sats 'visible' to your reciever to give it a proper reading!
If you are getting 3m accuracy it is turned off. With the inaccuracies switched on it was about 50m off IIRC. Some GPS receivers support supplementary readings from (usually costal) radio transmitters which can get it down to 1.5m ; this is called DGPS (Differential GPS).
Interesting you mention that. My GPS will give me an accuracy reading according to how many satellites it is picking up. On the 401 corridor in Southern Ontario where I do my speed tests, I get 7 to 11 solid hits and the speed matches the speedometer every time I check it.
However, in one deep bush area I camp, the military uses part of it for some kind of drop training (6000' old bush airfield) and my GPS has gone insane on me twice for a couple days. Both times it reported me about
10 km east of reality. In this area, I only tag 2 to 4 satellites and sometimes only get a '2D' fix instead of the 3D it usually gives.
I don't know for sure, but it sure seems like someone is messing with the signal consistently in/for that area.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Most of the replies talk about the speed, it's much more accruate to set it by the odometer. find a highway with mileposts, drive 10 miles (10km if you are in the northern provinces of the US LOL!) The difference between actual and your odometer is the actual % it is off. Multiply that times the number of teeth on your speedo gear to find out how many teeth you need to go up or down.
My guess is that you will be right > I bought my 2000 tj used from a broker. It came with 30x9.5 tires. Is
I know they can "JAM" GPS in certain areas...but it's all ground based jamming! I don't think they can skew the readings from teh actual satellites as the sats are only kicking out a timing signal. The Sats don't actually know where we are as our GPS units don't transmit back....
wonder what sort of "materials" have been left behind in some of those cold war bombing tests?!!?
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