Speed Calibrator for Mahindra Roxor

Fix that speedometer reading easily with Lutz Auto.

Dec 19, 2020

The Mahindra Roxor is a cool rig. It's like buying a new (or relatively new, in our case) diesel-powered 1986 CJ-7. Ours is a 2018, or the first year Roxors were available. Sure, it's an unabashed re-envisioning of an iconic off-road vehicle one that Jeep Corporate, in fact, hasn't built since 1986. Love them or hate them, Roxors are out in the off-road eco-space and ignoring them would be like ignoring reproduction parts for any classic 4x4 that aren't made in the OEM factory. That's silly. Our Roxor, like many off-road vehicles, has oversized tires, and that causes an issue. It screws up the gearing and screws up the speedometer reading odometer readings. That defeats the purpose of having those two features on your Roxor. Luckily there is a very simple fix for this problem from Lutz Auto that will correct the factory speedometer and odometer on all Roxors, as well as Toyotas with a three-wire speed sensor, 80 and 100 Series Land Cruisers, and Lexus LX450 and LX470. The install is comically easy, and once in place you perform a quick test and push some buttons and the speedo suddenly works again. Check it out.

This is what you get from Lutz Auto, the Mahindra Roxor speed sensor calibrator/correction device. The part consists of some wiring and the unit that houses two buttons that allow you to change the signal going to the speedometer by .5 percent. The wiring is simple and just plugs in line with your factory wiring using weatherproof factory-style plugs.

Here is the speed sensor on our Roxor. It has a zip-tie and some shrink wrap that will have to be removed.

With that removed, we can easily unplug the factory wire from the speed sending unit. Push the connector together as you lightly lift the retaining clip.

The Lutz Auto speed sensor calibrator/correction device simply plugs into the wiring inline. Next step is to loosely secure the device to the vehicle and drive the Roxor with a GPS and note how far off the speedometer is from the GPS reading. Note the speedo and GPS reading at a given speed.

Then with a little math we know how many times to push the positive or negative .5 percent adjustment button inside the unit. The instructions lay out the math simply. Their example is if your speedo reads 59 while the GPS says 65 you can plug that into their equation thusly: (65/59-1) x 100 = 10.17 (but we will round to the nearest 2 digits), so 10 percent. That means you need to increase your speedometers speed by 10 percent. That means pushing the up button 20 times with the key in the on position (each button push is worth .5 percent). If the speedometer reads faster than the actual speed, you will need to do the math and push the down button the corresponding number of times. Holding both buttons down for 10 seconds will reset the unit to factory.

Once you've tested to make sure the calibrator is set properly, you can seal up the unit with a little silicon and do some sort of final attachment. The unit is light in weight so it can be zip-tied to the wiring. We used some self-tapping screws to attach the unit to the frame of our Roxor. The best news is when we regear the Roxor we can reset the calibrator and set the speedo with the new axle gears and tires.

The proof is in the pudding, and while difficult to photograph our speedo is way more correct than it was without the Lutz Auto speed sensor calibrator/correction device.

Source:
Lutz Auto, https://www.lutzauto.com

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