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  #1  
Old 05-26-2012, 01:12 PM
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Thumbs up Hypertech Speedometer Calibrator--Works great on 2011/2012!

For street 'n strip purposes, I changed the factory tires on my 2011 Ram ST RCSB from the stock 265/70R17's to new 275/55R17's on the front staggared with new 305/45R18's on the rear. Both of the new tire sizes are within 1/10" in diameter at slightly under 29" (stock diameter was 31.6"). Obviously, I needed to correct my ECU for the new tire height.

A call to my dealer revealed that they could flash the ECU for about $95. I thought damnnn, that ain't cheap for 5 minutes work. I remembered that the Hypertech Speedo Calibrator was mentioned in a thread on this forum and one of the posters said it worked on 2011 models...! A quick visit to Hypertech's web site confirmed that information and I ordered one. It cost twice what the dealer wanted to flash the ECU but at least I would own it. It can read and erase codes, change gear ratios, calibrate the speedometer, and return to factory settings anytime. Possible tire sizes range from 22.5" to 44" in .25" increments. It's not a real tuner but it's as close as I can get for now.

The package arrived by UPS and included a USB cable, an OBD port cable, a CD that contains both instructions and an installable computer application for updating the Hypertech firmware online. I installed the app, ran it, and was promptly informed that I had the latest firmware. Cool! I then read the CD instructions which specified that no electrical device should be allowed to operate (draw current from the battery) while the Hypertech unit was connected to the OBD II port (apparently it is VERY voltage sensitive). I pulled the fuse for the sat radio, closed the door, fastened the seat belt, turned the key to "On" and connected the Hypertech to the OBD port under the dash. The unit's display came alive with checks and easy instructions. It said there was one DTC (data trouble code) which I looked up at an online OBD II website. It was..."Failure to communicate with radio". Well, of course, I just disconnected the radio fuse! More coolness--it works!

Happy that it all seemed to be connecting properly, I followed the simple screen prompts and entered my new tire size which was flash-written to the ECU without any issues. I am impressed that the unit does what Hypertech claims it does.

I rate it A+.





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Last edited by WarBaby; 05-27-2012 at 03:47 AM.
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Old 07-30-2012, 03:57 PM
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What unit of measure do you enter to calibrate the tire sizes ?
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Old 07-30-2012, 04:08 PM
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What unit of measure do you enter to calibrate the tire sizes ?
As mentioned above, "Possible tire sizes range from 22.5" to 44" in .25" increments".
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Old 07-30-2012, 11:10 PM
Jchaney579 Jchaney579 is offline
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Nice post man!!! This is a great find for somebody who goes to the track a lot and changes their rear tires out to DRs then back to their daily drivers setup!! Instead of having to go to the dealer each time, and paying 95 dollars... Or just dealing with the speedo being different! I am going to have to invest in one of these for sure!
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Old 07-30-2012, 11:17 PM
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Nice post man!!!
Many thanks to you.
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Old 01-30-2013, 12:16 PM
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Thanks for the great post WarBaby!. I will probably be changing my factory tire size (275-70-17) as it's an odd market size and limited to only a few manufacturers. This Hypertech Calibrator will be great for re-calibrating to a new tire size.
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Old 01-30-2013, 03:20 PM
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Originally Posted by CanuckHRAM View Post
Thanks for the great post WarBaby!. I will probably be changing my factory tire size (275-70-17) as it's an odd market size and limited to only a few manufacturers. This Hypertech Calibrator will be great for re-calibrating to a new tire size.
Glad my post was helpful.
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Old 03-22-2013, 04:34 PM
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Any of them work on more than one vehicle at a time?
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