question about speed and rpm with bigger tires - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 2 Old 06-04-2015, 10:20 PM Thread Starter
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question about speed and rpm with bigger tires

hey. i just purchased another JKU, its a Sahara, 2007, mexican. i drove about 700 miles from where i picked it to where i live.

most of the time it was a flat, long desert highway, with very light traffic, basically empty. so i adjusted the cruise control to 80 mph, and i noticed the tachometer was a little under 2500 rpm. i also tried going at 70 mph and the tacho was just over 2000 rpm.

now, the jeep has 285/70 R 17 BF Goodrich Mud terrains, almost new, so they have a lot of live (and weight) on them.

and i checked the speed with my cell phone gps and it was within 1 mile of what the speedmeter said.

all of this made me wonder, did the PO had something adjusted on the computer?? i know i can check if the jeep is regeared by lifting a tire and counting how many times it turns and how many times does the driveshaft turns... but how can i check if they did something with the computer??

i averaged about 16 MPG....

2007 JKU, 2.5" Rock Krawler lift, 285/70 17 mud terrains....
shu2kill is offline  
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post #2 of 2 Old 06-04-2015, 10:51 PM
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Join Date: Jun 2013
Location: utah
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well it sounds like the computer has been adjusted to compensate for the bigger tires. not sure how to check it though.

opinions are like a$$holes, everyone has one and some stink
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