Recalibration after new tires - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 13 Old 07-24-2017, 10:37 AM Thread Starter
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Recalibration after new tires

So I have new tire on my hew 2017 wrangler sport and I got the dealer to recalibrate the speedometer and everything for me using flashcal. My question is the flashcal lets you calibrate tire size 32.5 - 32.75 and my tires are 32.6. Should the computer not be programmed for 32.75? At 40mph and above the speedometer is off.


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post #2 of 13 Old 07-24-2017, 01:20 PM
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Exactly 32.6? Did you measure them while on the jeep?

The difference between a 32.6 tire and a 32.5 program is .2 miles per hour off. Do you think your speedometer is actually spot on at say 65 mph?

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I think too much of a pressure variant between Earth and outer-space... lack of oxygen... something like that.
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post #3 of 13 Old 07-24-2017, 11:59 PM Thread Starter
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Exactly 32.6? Did you measure them while on the jeep?



The difference between a 32.6 tire and a 32.5 program is .2 miles per hour off. Do you think your speedometer is actually spot on at say 65 mph?


I know it's off at 65 for sure. I think by 2 or 3 mph.


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post #4 of 13 Old 07-25-2017, 12:02 AM Thread Starter
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If speedometer reads 65 I am actually under that, maybe 63. At 70 I was actually going 67 according to traffic speed signs.


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post #5 of 13 Old 07-25-2017, 05:03 AM
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just use your flashcal and set it to 32.50psi or 32.25psi settings and test. Don't use stupid street-alert detectors for speed measurement , use google maps or some other phone accelerometer app like TorquePro to determine your true speed. Ya have to play with the settings a bit on your superchips tuner to get it right ...air pressure in tire can make a difference , environment can , tarmac temp can...you'll find sweet spot but I wouldn't let dealer play with my tuner , heh.


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post #6 of 13 Old 07-25-2017, 06:09 AM
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Quote:
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I know it's off at 65 for sure. I think by 2 or 3 mph.


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Quote:
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If speedometer reads 65 I am actually under that, maybe 63. At 70 I was actually going 67 according to traffic speed signs.


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2 replies and you didn't even answer the question I asked.

How accurate do you think the traffic speed signs are?

Quote:
Originally Posted by lohchief View Post
If people don't take a stand now,you'll be bitches under their thumbs tomorrow.
Quote:
Originally Posted by StubEXrube View Post
I think too much of a pressure variant between Earth and outer-space... lack of oxygen... something like that.
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post #7 of 13 Old 07-25-2017, 09:09 AM Thread Starter
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Quote:
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I know it's off at 65 for sure. I think by 2 or 3 mph.


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No I didn't measure them I went off manufacturers specs for the tires.
As far as speed I also used a speedometer app on my phone that registered the same difference as the highway signs. The only reason I mentioned them is I drove 1500 miles and passed 8 of them that all read the same numbers. They were all at least 100 miles or more apart.


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post #8 of 13 Old 07-25-2017, 11:36 AM
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Take a measurement of you tires.

You have to measure the tires. Then put that measurement in the procal. When I had my 33's, i put 33 in the procal and my speedo was off ( I didn't know any better at the time). Once i properly measured my tires, and put that number in the procal, the speedo was correct.
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post #9 of 13 Old 07-25-2017, 12:54 PM
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You really need to measure them while on the jeep aired to normal pressure to get the exact measurement.

Quote:
Originally Posted by lohchief View Post
If people don't take a stand now,you'll be bitches under their thumbs tomorrow.
Quote:
Originally Posted by StubEXrube View Post
I think too much of a pressure variant between Earth and outer-space... lack of oxygen... something like that.
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post #10 of 13 Old 07-25-2017, 01:33 PM
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I measured center hub to ground, times two, entered that figure into my AEV ProCal. Speedo is spot on at 70mph when compared to GPS.
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post #11 of 13 Old 07-25-2017, 03:24 PM Thread Starter
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Just measured 31.25. Now to reprogram and see how it goes. Thank you all!! New to this tire and computer thing. Didn't have it on my 91 wrangler (which I still didn't know to much about).


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post #12 of 13 Old 07-26-2017, 06:33 AM
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Its a big learning curve sometimes.

Quote:
Originally Posted by lohchief View Post
If people don't take a stand now,you'll be bitches under their thumbs tomorrow.
Quote:
Originally Posted by StubEXrube View Post
I think too much of a pressure variant between Earth and outer-space... lack of oxygen... something like that.
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post #13 of 13 Old 07-27-2017, 09:33 AM Thread Starter
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Quote:
Originally Posted by Uncle Sams Misguided Child View Post
Its a big learning curve sometimes.


Well I appreciate the help. Speedometer is spot on now. Tested up to 75 mph. Thank you for the help.


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