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Unread 08-04-2012, 07:42 PM   #1
wrench462
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Jk At Silver Lake and can't get up, what I'm I doing wrong?

I have a 2012 Rubicon Unlimited all stock. I am running 8-10 psi in my tires but just can't seem to make it up test hill. I am in 4WD high and have tried going in D and letting the Jeep do all the shifting as well as keeping it in 2nd the hole time. I have tried getting a long running start as well as a shorter WOT launch. All to no avail. So far I am looking like a donkey in front of the wife. Any advice would be greatly appreciated.

Thanks.

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Unread 08-04-2012, 10:44 PM   #2
Alboy79
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Lower your tire pressure more. 4-6psi is where I run my tj
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Unread 08-05-2012, 08:29 AM   #3
JeepShaun84
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drop it down in 4 low
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Unread 08-05-2012, 12:21 PM   #4
greywolff009
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I was running 12psi on my TJ. Ran 4low and 4th gear(manual trans). Had no problems anywhere even made it up test hill a few different times.
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Unread 08-05-2012, 01:22 PM   #5
SteveBrady
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high rpms help
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Unread 08-06-2012, 06:42 AM   #6
wrench462
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Thanks guys. It sounds like I needed to reduce the tire pressure from 8-10 to 4-6 psi. It was windy yesterday and we needed feel like getting sand blasted. So we went two tracking at the state park in Pentwater. Heading home today. But next time I will know 4-6 psi if I want to make it up test hill at the Dunes. Thanks agian.
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Unread 08-06-2012, 06:55 AM   #7
bobjp
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I run 12 psi at Silver Lake and have no issues. Granted, your Unlimited is heavier, but you should have no issue getting up the hill.

The issue is usually momentum, not traction. Did you try manually shifting? I usually use second gear in 2-high the whole way up (I have 3.07 gears). Occasionally I will go for 3rd, but a lot of times it steals my momentum.
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Unread 08-06-2012, 04:27 PM   #8
GL08JK
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You need to be in 4-low. Also another thing is with the automatic tranny you may also have to have Overdrive off also to avoid it going into OD and shifting back down at the wrong time.
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Unread 08-07-2012, 09:50 AM   #9
wrench462
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Greywolf, bobjp and gl08jk,
Are you guy running stock tires? If not what size do you have?

I remembered to turn the traction control off but forgot about overdrive. Next time I will.
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Unread 08-07-2012, 06:25 PM   #10
bobjp
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I run 31's now, but have been to Silver Lake with 29's.

It sounds like you were just in the wrong gear. I have a stick but can imagine what it would be like with an automatic that keeps upshifting. I'm sure you can make it in 2nd or 3rd, but not any higher.
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Unread 08-07-2012, 07:20 PM   #11
JeepShaun84
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I have been up there with everything from 235/75/15 all the way up to 35x12.5.. I have always ran about 6-8psi and have been able to get around fine in 2wd/4high for climbing the bigger hills EXCEPT with the 35s (still had stock 3.55 gears) I had to put it in 4 low to climb the steep hills..

here is when i had 33s

and with 35s
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Unread 08-07-2012, 09:42 PM   #12
GL08JK
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Quote:
Originally Posted by wrench462 View Post
Greywolf, bobjp and gl08jk,
Are you guy running stock tires? If not what size do you have?

I remembered to turn the traction control off but forgot about overdrive. Next time I will.
I have ran both the stock rubicon tires and now run 35's and had to use 4 low for test hill with both sets of tires. I have an auto tranny in my rubicon and always had to turn off overdrive to keep the transmission in the right gear at high RPM's in Drive. Even after regearing from 4:10 to 5:13's and my 35's I still have to use 4-low most of the time on test hill. You have to pretty much learn where your powerband is with the auto tranny so you can keep in shifting correctly without bogging down and auto shifting at the wrong time. Like other have said high RPM's is what is needed.
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Unread 08-11-2012, 07:23 PM   #13
greywolff009
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Quote:
Originally Posted by wrench462 View Post
Greywolf, bobjp and gl08jk,
Are you guy running stock tires? If not what size do you have?
I have 31 inch tires, BF Goodrich All-Terrain T/A KO Tire.
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Unread 08-12-2012, 07:28 PM   #14
phittie1100
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My wife's 2008 Unlimited was at the opposite end of the spectrum - 15psi in the stock GS-A radials made it pretty much point and shoot after turning off the traction control. It was easier to get up test hill than my 2006 LJ. When she let me take hers up test hill that is....
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Unread 08-15-2012, 06:44 AM   #15
jtackerman28
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I've seen a Subaru outback go over test hill, 10 psi, od off, 4low and floor it utill the top as to not launch it.
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