Speedo Calibration for 37s - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 02-28-2014, 08:13 AM Thread Starter
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Speedo Calibration for 37s

So has anyone figured it out yet? I would love to have my speedo correct again.

2011 F250 6.7 4x4 CC Lariat
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37" Toyo MT
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post #2 of 19 Old 02-28-2014, 08:38 AM
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The only way to do it is with the Hypertech online unit. I am not trying to sell anything in a non for sale forum. However, if you PM me I might know where you could get one. Haha.

For Sale: 2013 Lariat Ultimate CCSB 15K miles
3.55 ELD, Tinted, AMP setps, Retrax Pro, Two Spot Rigid D2 Dually's, Two Flood Rigid D2 Dually's, Fabtech 6in lift, Billstein struts, Dual Pro Comp Steering Stabilizers, 20in XD Addicts, 37x13.5x20 Toyo M/T, Line-X, Diversi-Tech 12" drop hitch, H&S Mini Maxx, 5in Flo Pro, H&S EGR delete, S&B CAI

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post #3 of 19 Old 02-28-2014, 08:44 AM
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So, the Mini Maxx is still not able to calibrate tire sizes greater than 34"?
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post #4 of 19 Old 02-28-2014, 10:01 AM
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No it isn't. I have mine set to 34 and I just live with the difference.

For Sale: 2013 Lariat Ultimate CCSB 15K miles
3.55 ELD, Tinted, AMP setps, Retrax Pro, Two Spot Rigid D2 Dually's, Two Flood Rigid D2 Dually's, Fabtech 6in lift, Billstein struts, Dual Pro Comp Steering Stabilizers, 20in XD Addicts, 37x13.5x20 Toyo M/T, Line-X, Diversi-Tech 12" drop hitch, H&S Mini Maxx, 5in Flo Pro, H&S EGR delete, S&B CAI

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post #5 of 19 Old 02-28-2014, 10:05 AM
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Oh that sucks! I was anticipating having my speedometer correct after my Mini Maxx was installed. Maybe the guy calibrating my 50 gallon fuel tank will be able to also do my tires.
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post #6 of 19 Old 02-28-2014, 01:50 PM
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The dealer is able to calibrate the tank to a 50 gallon tank but they can only change the speedo as much as the Mini Maxx can.

For Sale: 2013 Lariat Ultimate CCSB 15K miles
3.55 ELD, Tinted, AMP setps, Retrax Pro, Two Spot Rigid D2 Dually's, Two Flood Rigid D2 Dually's, Fabtech 6in lift, Billstein struts, Dual Pro Comp Steering Stabilizers, 20in XD Addicts, 37x13.5x20 Toyo M/T, Line-X, Diversi-Tech 12" drop hitch, H&S Mini Maxx, 5in Flo Pro, H&S EGR delete, S&B CAI

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post #7 of 19 Old 02-28-2014, 03:58 PM
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Quote:
Originally Posted by FMKeith View Post
The dealer is able to calibrate the tank to a 50 gallon tank but they can only change the speedo as much as the Mini Maxx can.
Yep. He was not able to calibrate the 37's.
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post #8 of 19 Old 02-28-2014, 05:51 PM Thread Starter
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But the hypertech unit can?

Sent from AutoGuide.com App

2011 F250 6.7 4x4 CC Lariat
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6" 4-link BDS
22" Fuel Hostage
37" Toyo MT
H&S BLACK MAXX,
5" MBRP straight pipe
AMP Steps
Truck pics ---->
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post #9 of 19 Old 02-28-2014, 06:26 PM
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Quote:
Originally Posted by mysticblu999 View Post
But the hypertech unit can?

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Yes it can. Here is how. When you go to the dealership to have the tire size changed in the ECU you are stuck within the stock perimeters of the ECU. The Hypertech unit goes between the wire harness and the gauge cluster. So it just changes the signal that the ECU is sending the cluster. It ask you what tires were stock and what you changed to. Including rear end gearing and it is able to change that signal to anything it wants. Make sense or did I muddy that up for you?

For Sale: 2013 Lariat Ultimate CCSB 15K miles
3.55 ELD, Tinted, AMP setps, Retrax Pro, Two Spot Rigid D2 Dually's, Two Flood Rigid D2 Dually's, Fabtech 6in lift, Billstein struts, Dual Pro Comp Steering Stabilizers, 20in XD Addicts, 37x13.5x20 Toyo M/T, Line-X, Diversi-Tech 12" drop hitch, H&S Mini Maxx, 5in Flo Pro, H&S EGR delete, S&B CAI

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post #10 of 19 Old 02-28-2014, 06:52 PM
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Quote:
Originally Posted by FMKeith View Post
Yes it can. Here is how. When you go to the dealership to have the tire size changed in the ECU you are stuck within the stock perimeters of the ECU. The Hypertech unit goes between the wire harness and the gauge cluster. So it just changes the signal that the ECU is sending the cluster. It ask you what tires were stock and what you changed to. Including rear end gearing and it is able to change that signal to anything it wants. Make sense or did I muddy that up for you?
Do you know if they're a single user product or can one device calibrate multiple vehicles? Maybe the guys at 4 Wheel Parts can make my speedometer accurate for free since I had all my wheel, tire, and suspension work done there.
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