How critical is the 6th gear retrain? I won’t be able to use 6th until I regear in 2 weeks. I’d like to fix my TPMS and speedometer until then.
Okay, i see where youre coming from. Thanks for the explanation.It isn’t just the speedo, it’s the odometer and the miles to empty calculator too.
In my case I’m off by just under 20% (32.6 to 38.5). If it was just 35’s I might ignore it, but this is a jump to 39’s.
I also pass through 4 school zones on my way to work. I would’t want to accidentally be speeding with the poor stopping distance of a Wrangler pushing big tires and the children of the people that live here with no situational awareness.
Just to be clear I meant I might get pulled over only while doing the retrain because I have to hold 6th with pressure for 30 seconds.Still fundamentally, bigger tires mean larger circumference which translates to less wheel revolutions per unit distance. This results in the speedometer reflecting a lower indicated vs true travelling speed. The difference is the percentage of the change in tire diameter. Worse yet, the higher the velocity the larger the error.
Telling a traffic officer that you willingly modified your vehicle's configuration, from factory specification, will only hurt (not help) your cause. Any tampering, even unintentional, may even yield you other maintenance related citations.
If your willing to go above the speed limit in general, running on larger rubber than stock will make it appear that your velocity is lower than it really is. So if you are thinking that the 10 to 15 over threshold is acceptable risk, you may in reality be facing a 20 over or more ticket. Maybe even a mandated court appearance, especially if out of state.
Running your rig with an inaccurate speedometer is like a pilot flying with a broken altimeter. It's just a matter of time until you find yourself in an unpleasant predicament.
Some things just require adjustment. Unless you are comfortable with performing all this velocity error math in your head (in real-time), don't trivialize your speedometer, odometer and distance-to-empty (DTE) guages. Life is too complicated enough already without more points on your driving record. I'm certain your insurance premium may seem way too expensive as it is.
On the bright side however, you'll retain a better trade-in value since the odometer will be clocking less miles travelled per true unit distance.
Then of course running out of fuel by relying on the distance-to-empty indication, whether accurate or not, just means you're either stupid, ignorant, poor (or more likely some combination of all three). Performing any kind of math is not likely in your vocabulary. The DTE is nothing more than an estimate and a crappy one at that. Way too many subtle variables such as quality of gas, tire pressure, wind speed even the Coriolis Effect of the Earth's rotation under your spinning tires.
Good luck. Happy Jeeping.
Avoid those school zones at all cost...