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Pentastar Break-In Difference!

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Old Aug 5, 2012 | 07:57 PM
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  #121  
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powrsurg
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From: Middle Island, NY
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Originally Posted by MeatCurtains
When I read that I called my dealer and asked the same thing. I got a laugh and a flat out no. The only bit of info he offered me is it more likely has to do with how the electronic drive by wire stuff works, and way less with the "motor being awakened".
I would imagine the Service Department would know. I mean, how can something so big like that not make it to the Dealer?
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Old Aug 6, 2012 | 05:14 AM
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Originally Posted by powrsurg
2 posts that address this topic. Too bad it took a gazillion pages to get there. Thanks for adding more detail. Do you suggest I wait to 5000 miles to Dyno my jeep? Me and another member are performing a test on two mods and I want to see if there is an HP and torgue difference before and after.
I would Imagine that as long as you did the comparison within the same bracket of mileage you would find out whether the performance increased, but to get the final performance number I would waid til after 5000. Just to be on the safe side.
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Old Aug 6, 2012 | 05:50 AM
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LilSteve
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New here...Just picked up my 12 JKU a couple of weeks ago. So far 250 miles of mild driving and 12.5mpg...hoping for more miles soon.
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Old Aug 6, 2012 | 08:16 AM
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  #124  
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MeatCurtains
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Originally Posted by LilSteve
New here...Just picked up my 12 JKU a couple of weeks ago. So far 250 miles of mild driving and 12.5mpg...hoping for more miles soon.
You will enjoy it. If you do a lot of driving is a little quieter than the older ones.

I got mine about 2 weeks ago, I've put around 800 miles on it. Absolutely no change in gas mileage, I still get around 16-17

What gears do you have. I'm really curious how people get such terrible fuel mileage. I've never got lower than 15 in a JK even the old ones.
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Old Aug 6, 2012 | 08:20 AM
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Hi all. I just want to say that the worst gas mileage I have got was around 20.
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Old Aug 28, 2012 | 07:56 PM
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Originally Posted by Thumper291
Hi all. I just want to say that the worst gas mileage I have got was around 20.
Im curious, what gears do you have?
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Old May 20, 2013 | 11:11 AM
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groovebus
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My 2013 JKU with 3.21 gearing and stock 32"s gets a solid 16mpg back and forth to work (15 Miles one way) but that's CA traffic going 75 mph bumper to bumper; if you go slower someone will run up your butt. (or it's a parking lot) When I go to NV I get around 19-20mpg.
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Old May 20, 2013 | 01:22 PM
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Jerrygee
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Originally Posted by KSRubicon
Per the dealer, Jeep did install a self-terminating governor of sorts on the 2012 JK just so the new owners wouldn't run out and redline it at full power with new parts. The break in period is 500 miles...
Originally Posted by Blade
...0-500 miles: the computer is set to an almost limp mode to alow for proper breakin of other drivetrain components, trans, axles, driveshaft, wheel bearing, transfercase, etc...
What a load of crap! Some manufacturers will install hardware that will not allow vehicles to exceed certain RPM limits during transport from the factory to the dealer but that hardware is removed at the dealer level before the vehicle is delivered to the end user. There is no "self-terminating governor" and the computer is not set to "almost limp mode" for the first 500 miles. If you don't believe me see how many RPM's you can hit on your way home after taking delivery of your new JK. My bet is you can hit the rev-limiter which is north of 6,500 RPM's. I have had a new JK with both the 3.8 and 3.6 engine and had nothing holding me back from hitting redline using full throttle before reaching 500 miles.
Last edited by Jerrygee; May 20, 2013 at 05:23 PM.
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Old May 20, 2013 | 05:06 PM
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Jonathan_JK
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Originally Posted by STCjpr
Will the flux capacitor begin... fluxing, now?
Only if you hit 88 mph. Don't scare DOC when you stop though.
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Old Mar 25, 2014 | 06:59 AM
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TristanWomack
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20k on my pentastar and it still pulls hard.
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