Speedo Calibrations

Bigharm27 · Jul 4, 2017

I tried searching for it first and if any one knows of a thread with the answer just post it and ill go and read it. 2012 with 37 inch tires. Running a H&S tuner and wondering if there is any fix. Looks like hypertech has a device that corrects up to 54s. Can I use this with my current tuner? Current speed is 5mph over than what Speedo reads. thanks

8WR_ZJ · Jul 4, 2017

Yes hypertech will work fine in your application. You mivht be able to calculate the effective ratio of the factory tire and gear ratio and to what your current setup is.

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Bigharm27 · Jul 5, 2017

8WR_ZJ said:
Yes hypertech will work fine in your application. You mivht be able to calculate the effective ratio of the factory tire and gear ratio and to what your current setup is.

Sent from my SAMSUNG-SM-G891A using Tapatalk

ok so on the hypertech it supposedly only goes to 34 inches but u can change the gearing input. do u know where a calculator is to figure that up and play with the different gear ratios and tire sizes to get me where I need to be. I guess that's what ur talking about?

BigRed97 · Jul 5, 2017

I have the hypertech unit with 37s, no need to mess with gear ratio settings.
Works perfectly

Bigharm27 · Jul 5, 2017

BigRed97 said:
I have the hypertech unit with 37s, no need to mess with gear ratio settings.
Works perfectly

Hypertech only advertises up to 34 inch tires though?

8WR_ZJ · Jul 5, 2017

Agreed have used half dozen times on customers trucks two with 40's. For calculators use randys ring and pinion.

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BigRed97 · Jul 6, 2017

Says No upper limit

BigRed97 · Jul 6, 2017

Well the picture is chit but thats what it says haha

Bigharm27 · Jul 6, 2017

8WR_ZJ said:
Agreed have used half dozen times on customers trucks two with 40's. For calculators use randys ring and pinion.

Sent from my SAMSUNG-SM-G891A using Tapatalk

OK IT SEEMS BIG RED IS USING THE CABLE THAT PLUGS INTO THE CLUSTER AND YOU ARE USING THE ELECTRONIC SPEEDO CALIBRATOR? WOULD LIKE TO FIND OUT HOW TO USE THE ELECTRONIC DEVICE IF POSSIBLE BUT HAVE NO IDEA HOW THE CALCULATIONS ON RANDYS GO INTO THE DEVICE. CAN U EXPLAIN A LITTLE MORE? THANKS

PowerStrokePops · Jul 7, 2017

Quit screaming at us!
Get the one BigRed is suggesting. I'm running the same one and it works like a charm with my 37's. Connect it to a laptop, punch in the required settings and then plug it inline with the speedo cable. If running a tuner leave tuner options set to the stock settings.