Speedometer calibration

Anyone use the hypertech on a 3rd gen? Running 285/70/17 Toyo MT's on the Pro. I know how off I am, roughly 6-7MPH, but I want to get the speedometer working correctly. Search feature and Google only show second gen threads.

Thanks!

 

I have the calibrator from hypertech. Works as advertised. Buy it, read instructions, and install. Just make sure you disconnect the battery before you unplug the instrument cluster or you get a crap ton of faults. It may just be a placebo effect, but I think it shifts better. In theory the speed sensor is now calibrated right and so the shift points are back to where they should be stock. I recommend it as it bugged the ever-living shit out of me that I was off.

 

Thank you, that was the answer I was looking for. It's definitely annoying and if anyone drives my truck but me, I don't want them to get into trouble.

 

I'm going to say that it has to be placebo effect. The combination meter is the "end of the line" and simply displays the speed you are going as a translation of speed pulses. The hypertech intercepts that signal going to the combination meter and alters the display only. It does nothing to modify the signal the ECU is receiving from wheel speed sensors.

Only way to "trick" the ECU is to regear to the proper ratio.

 

It's going to be a percentage and not a constant speed difference. It's about 6 or 7% faster than indicated speed. The speed differential is less at lower speeds (ie 30 on the dash does not mean 36, likely is closer to 33).

Just to be aware, FYI.

 

You might find this thread interesting, particularly post 7. https://www.tacomaworld.com/threads/p0500-code-vehicle-speed-sensor.434829/

I realize this is a 2nd gen thread I'm referencing, but do we know for sure the 'flow' changed for this with the 3rd gen. ?

 

I guess we don't. But we will never know because of the black magic going on inside of the ECU and combination meter.

Logic points to this flow though, especially with the new technology employed by the 3rd gen...why would the speed sensors feed information to the combination meter AND THEN to the ECU? That would mean you had to interpret the vehicle speed from the 4 wheels at the combination meter and not in the ECU...which means the wheel speed sensors all connect to the cluster in some way. This makes even less sense. The only way that makes sense is if the ECU can translate vehicle speed, and convey that speed to the combination meter.

Always open to believing that it acts differently, but I see no convincing evidence other than 2nd gen with older technology to say otherwise.

 

Hypertech did the job and installation was a breeze.

 

Does it get removed or stay plugged in?

 

Stays plugged in. It mounts behind the cluster.

 

Oh darn.

Do they make any that gets programmed and can store in closet?

 

If the factory Etune Navigation system comes with a tire/speedometer calibrator, why not use it?

APPS / SETUP / NAVIGATION / DETAILED NAVI SETTINGS

 

That is only for navigation use, hence why it is in the navigation setting. It does nothing to change the speed displayed in the cluster.

 

So, I'm going to revive this thread to ask @Sean73T if the hypertech unit fixed fuel economy and the odometer readings as well?

I would assume it does, but I'm currently exploring options to recalibrate my speedometer.

 

I can confirm that yes it does correct the speedometer and the odometer. Went to 35'' tires 2 weeks into ownership and the calculations are correct. As others stated this is an in-line addition that calculates the % difference of your stock tire diameter to your newly installed diameter. The hypertech unit does not adjust shift points.