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Old 11-04-2015, 06:46 AM
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285/70/R17 worth flashing?

I just got new tires. Duratracs 285/70/R17. Is it worth flashing?

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Old 11-04-2015, 06:50 AM   #2
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Yes it is. Makes a big difference on an auto transmission.

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Old 11-04-2015, 07:26 AM
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Thank you. I wasn't sure since the change is so small ~2%.
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Old 11-04-2015, 07:35 AM   #4
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would this be true of a manual transmission too? (soon to do the same thing but with a manual)
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Old 11-04-2015, 07:43 AM   #5
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Originally Posted by UnaBonger View Post
would this be true of a manual transmission too? (soon to do the same thing but with a manual)
I would think you would want the computer to know how fast the car is really going, not sure if that info is sent to the ABS and stability control systems, or not.
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Old 11-04-2015, 07:51 AM   #6
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my 285/70R17 Duratracs measured out to 32" the same as my stock SRA's

GPS confirms the speed is the same etc - so I never bothered reflashing mine
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Old 11-04-2015, 08:07 AM   #7
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I just bought the same exact wheels and have auto transmission. Could someone educate me on what flashing is? Thanks!
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Old 11-04-2015, 08:19 AM   #8
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my 285/70R17 Duratracs measured out to 32" the same as my stock SRA's

GPS confirms the speed is the same etc - so I never bothered reflashing mine
Mine was the same when I went from the stock BFG km to the 285 duratracs. Speedo didn't change. Dealer told me new tire was same height but wider. So I moved to 35's. Definitely needed to flash for speedo change.
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Old 11-04-2015, 08:23 AM
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my 285/70R17 Duratracs measured out to 32" the same as my stock SRA's GPS confirms the speed is the same etc - so I never bothered reflashing mine
The gps gets the speed from the speedometer so it's always going to match.
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Old 11-04-2015, 08:26 AM   #10
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Not when you use a standalone GPS system (I don't have nav in my Jeep)

the 285's are the same diameter as my OE SRA's they are just wider

not sure what tires you're coming from - but this is my experience
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Old 11-04-2015, 08:27 AM
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Not when you use a standalone GPS system (I don't have nav in my Jeep)
Makes sense. Sorry about that
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Old 11-04-2015, 08:31 AM   #12
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Makes sense. Sorry about that
no worries - I should have specified
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Old 11-04-2015, 08:35 AM   #13
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I think the 285's are close enough to not need the flash. If you have 3.21's, it is still probably noticeable, even though the change is minimal.
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Old 11-04-2015, 08:36 AM   #14
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my 285/70R17 Duratracs measured out to 32" the same as my stock SRA's

GPS confirms the speed is the same etc - so I never bothered reflashing mine

Same here, including GPS reading.
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Old 11-04-2015, 08:42 AM   #15
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3.21, 285/70R17 Cooper AT3s. Did not notice a difference when I ditched the SR-A's... haven't flashed, been running them for a year.
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Old 11-04-2015, 08:48 AM   #16
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I just bought the same exact wheels and have auto transmission. Could someone educate me on what flashing is? Thanks!
Basically telling the computer there has been a "change" in this case - Tire size.
This can be accomplished with a handheld device (Flashcal, Procal, etc) sourceable from any of our forum vendors (Qtec, EXTRyan)
That way your speedo, odo, and everything else knows "Wutz up".
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Old 11-04-2015, 08:59 AM   #17
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Circling back on a thread regarding extended warranties:and the possible exclusions the contracts stipulate I wonder if re-flashing an ECU constitutes "altering original specifications" in relation to a warranty claim. Anyone have any experience this way?
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Old 11-04-2015, 09:07 AM   #18
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I always reflash back to stock before dropping the Jeep off at the dealership for any work
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Old 11-04-2015, 09:13 AM   #19
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I always reflash back to stock before dropping the Jeep off at the dealership for any work
Good call.
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Old 11-04-2015, 09:17 AM   #20
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The gps gets the speed from the speedometer so it's always going to match.
This isn't true at least on our 2016 with a 430n, test it going up a steep hill at speed - the GPS sees you moving slower than you actually are because of angles and all that (your relative position to the satellite is changing at a slower rate than you actual ground speed)
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Old 11-04-2015, 09:20 AM   #21
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AEV Procal says in their FAQ's:

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The ProCal only adjusts parameters the vehicle uses in calculations. These parameters will not void your warranty, will not cause reliability issues, and can always be modified or restored to an original value.
Of course, you are taking the word of a company that's trying to sell you something.

All of the dealer-modified Wranglers I've seen the the showrooms use AEV Procal, though. But, my experience is pretty limited.

There are several discussions on the forum going back many years on this subject. Procal is generally considered the most "dealer friendly." As Argent mentioned, many people revert to stock anytime they bring it in for service; but with Procal, I've heard that isn't necessarily mandatory, just advisable. If the dealer changes anything with the computer, then you have to reflash with the Procal.

I think it becomes a little more poignant each year, though, as automobile manufacturers are moving toward proprietary software systems in their vehicles that they are discouraging consumers from altering in any way. 2015 makred the first year where the Wrangler computer disallowed Flashpaq tuning (without replacing the computer module). There will come a time in the future when programming and tuning are locked out.

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