Re-calibrating speedometer and odometer?

C

coldryder

New member
Assuming that I decide to move from 265/70/17 to 285/70/17 when I get my lift, how do I go about re-calibrating my speedometer and odometer so that they are accurate with the larger tires?

Thanks.
 
Register to hide this ad
There are aftermarket systems that do that, but I wouldn't bother. As a matter of fact, the speedometer is more accurate with the 285's. I have verified this with a '11 limited and limamikes '10 SR5.

Just check it with a GPS unit, smart phone app, or mile markers.
 
Ducmonsta said:
There are aftermarket systems that do that, but I wouldn't bother. As a matter of fact, the speedometer is more accurate with the 285's. I have verified this with a '11 limited and limamikes '10 SR5.

Just check it with a GPS unit, smart phone app, or mile markers.
Click to expand...

I like the mile marker approach. I can picture Antman furiously writing down his calculations as he's trying to drive at night, utilizing some of his high-speed LEDs to see his handwriting... as he creeps into the lane of an old man and gets his truck dinged-up. :lookout:
 
Ducmonsta said:
There are aftermarket systems that do that, but I wouldn't bother. As a matter of fact, the speedometer is more accurate with the 285's. I have verified this with a '11 limited and limamikes '10 SR5.

Just check it with a GPS unit, smart phone app, or mile markers.
Click to expand...

My experience to this was quite the opposite. Using a speedometer app (GPS based) on my iPhone, i found that the stock tires were quite accurate to the 4Runner's speedometer @ 60mph. However, once I put on 33" tires, the speedometer @ 60mph was wrong (compared to the GPS) by almost exactly 4mph or 1/15th (the difference in outer circumference from the stock tires vs the 33" tires).
 
So, I guess, it's back to my original question. If it turns out that after installing the larger tires on my 4Runner, I determine that the speedometer is less accurate than it was before, how do I re-calibrate? What are these aftermarket systems that Ducamonster referenced? Is the re-calibration something the dealer can do (will do)? What sort of cost?

Thanks all.
 
limamike said:
I like the mile marker approach. I can picture Antman furiously writing down his calculations as he's trying to drive at night, utilizing some of his high-speed LEDs to see his handwriting... as he creeps into the lane of an old man and gets his truck dinged-up. :lookout:
Click to expand...

Hey! I resemble those remarks!
 
Why do you want to recalibrate it?

I think it's counter-intuitive to recalibrate it because you're deprecating the value of your car. With larger tires, the odometer is rolling slower than it should be, prolonging your warranty and preserving the value of your vehicle.


If you went from stock tires to 33" tires, you're effectively shutting off your odometer 2 days/month.
 
According to my GPS I am now spot on accurate with my 285s. So no need to re-calibrate, unless my tire guy did it with out me knowing.
 
KO,

I guess my primary concern is having an accurate speedometer. I don't need any (more) speeding tickets.

I am not concerned as much with the odometer, other than ensuring my oil changes and other maintainence is done at the right mileage. My last vehicle was at well over 200,000 miles when another driver ran a red light and t-boned me, sending the car to the big junk yard in the sky. I run my vehicles into the ground and I'm not looking to preserve resale value.
 
Ducmonsta said:
As a matter of fact, the speedometer is more accurate with the 285's. I have verified this with a '11 limited and limamikes '10 SR5.
Click to expand...

I agree, well I don't have the 285's, but I have noticed how much my speed on the dash differs from multiple GPS units that all read the same. I figured for something produced in 2010 they could at least get the speed right (one of my few complaints about the 4R).
 
westwind77 said:
I agree, well I don't have the 285's, but I have noticed how much my speed on the dash differs from multiple GPS units that all read the same. I figured for something produced in 2010 they could at least get the speed right (one of my few complaints about the 4R).
Click to expand...

Yup agreed, My Tacoma was the same way. I'm thinking that all Toyota trucks are the same way. With the different models all having different editions with different tire sizes I guess Toyota feels Close is good enough :shrug: You'd think Toyota would make it easier for the speedo to be calibrated.
 
Two stealer's told me no way to recalibrate the 5th Gen 4R. Now, since they "could" charge me to do the work and I would have paid....I think they are telling me the truth.....:mad: Be safe.
 
Would any of the Hypertech Inline Speedometer Calibrator Modules work? There isn't one made specifically for the 4Runner but there is for the FJ. :shrug:
 
Oh , it can be done. We just have to talk antman into bigger tires first to motivate him. He CAN do it! All those wires up under the dash look the same to me!
This guy did it with a speedohealer on a 4th Gen......... Speedometer correction - Toyota 120 Platforms Forum

Qjake said:
Would any of the Hypertech Inline Speedometer Calibrator Modules work? There isn't one made specifically for the 4Runner but there is for the FJ. :shrug:
Click to expand...

Good find!If it works for the FJ ,then it should work on the 4Runner.
 
Last edited:
I'm kind of surprised these speedometer correctors are even legal . You could go and in theory, set it so your reading way on the low side and it would keep your mileage low. Then just use your GPS to get your actual speed and not even pay attention to the factory speedometer.
 
You must log in or register to reply here.

Members online

No members online now.
Total: 187 (members: 1, guests: 186)

Forum statistics

Threads
278,306
Messages
3,554,045
Members
248,016
Latest member
Advally Service

Share this page

Trending content

Back
Top