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Unread 02-04-2013, 10:53 AM   #1
brh5073
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Acceleration

I am a new jeep owner. I just got my jeep two days ago and i have a question about its acceleration. I was on the highway in 6th going 70 the i came to a slight hill and i was having a hard time and started to slow down so i put it in 5th and it continued to have a hard time and continued to have a hard time. It stayed around 45 as it climbed the hill with my foot to the floor hitting the gas. Same thing happened when i was climbing a hill going 35 in 3rd gear.
I was also on a flat straightaway and wanted to see how long it would take me to go from 65 to 70 and in 6th it took about 45 secs and in 5th took about 35-40 secs. Is this normal for a jeep?

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Unread 02-04-2013, 10:54 AM   #2
biffgnar
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What kind of jeep? What transmission? What tire size? What axle gearing?
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Unread 02-04-2013, 11:31 AM   #3
brh5073
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Quote:
Originally Posted by biffgnar
What kind of jeep? What transmission? What tire size? What axle gearing?
Sorry I thought I said it. It a 6 speed manual transmission on a 2009 Sahara. I can not remember what size the tires are but I think they are the stock tires. There is about 14k miles on the car.
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Unread 04-09-2013, 08:00 PM   #4
SKELITOR117
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What engine size dude? Details details details. I can get the info you want but I need some first.
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Unread 04-19-2013, 11:33 AM   #5
rubi513
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Quote:
Originally Posted by brh5073 View Post
I am a new jeep owner. I just got my jeep two days ago and i have a question about its acceleration. I was on the highway in 6th going 70 the i came to a slight hill and i was having a hard time and started to slow down so i put it in 5th and it continued to have a hard time and continued to have a hard time. It stayed around 45 as it climbed the hill with my foot to the floor hitting the gas. Same thing happened when i was climbing a hill going 35 in 3rd gear.
I was also on a flat straightaway and wanted to see how long it would take me to go from 65 to 70 and in 6th it took about 45 secs and in 5th took about 35-40 secs. Is this normal for a jeep?
I am guessing that you have the 3.8 because the 4 cylinder was not offered for the jk. At least I don't think it was. And no your truck should not be that slow. Even with 35's and 3.07 gears I would think it would be faster than what your stating.

Last edited by rubi513; 04-19-2013 at 02:42 PM..
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Unread 04-19-2013, 11:49 AM   #6
brh5073
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3.8l the acceleration is ok now but going up to school i have a hard time going up the mountain. Also my 2nd gear sync seems like its going.
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Unread 04-19-2013, 04:19 PM   #7
222Doc
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Quote:
Originally Posted by biffgnar View Post
What kind of jeep? What transmission? What tire size? What axle gearing?
What no one is a clairvoyant here.
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Unread 04-19-2013, 07:25 PM   #8
brh5073
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Quote:
Originally Posted by 222Doc

What no one is a clairvoyant here.

I mean i figured you guys would know what a stock JK has. 3.21 gear ratio, 6 speed manual, i believe 33 inch tires. Like i said its a 2009 sahara.
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Unread 04-19-2013, 09:34 PM   #9
222Doc
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No offense just poken you a bit.

they did not come 33". are the 12.5 wide? if so they are after market.

3.8's are very picky on gears. Jeep should have never used 3:21 gears. those that did get them came with like 29-30"s? and they are street tires. Most people end up with 4:88/5:13 for 33/35". 3.8 is well known to be lacking in torque. Off road it does ok but that is by gear reduction.

if you have 33"s then that is thetrouble. Need a regear. That will help the MPG, alittle.



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Unread 04-20-2013, 12:36 AM   #10
brh5073
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I meant to say 32 inch tires which i believe are the stock size tire. I will check when i get the chance tomorrow. I do want to regear butamnit looking forward to replacing the front axle. Why would Chrysler make a small front axle that couldnt take the bigger gears? I plan on going with a 4.10 ratio and get 35s with a 3.5-4 inch lift. Thats a while a way though. I need to make some money first. Can anyone suggest a good lift kit that wont break the bank?
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Unread 04-20-2013, 07:38 AM   #11
222Doc
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Quote:
Originally Posted by brh5073 View Post
I meant to say 32 inch tires which i believe are the stock size tire. I will check when i get the chance tomorrow. I do want to regear butamnit looking forward to replacing the front axle. Why would Chrysler make a small front axle that couldnt take the bigger gears? I plan on going with a 4.10 ratio and get 35s with a 3.5-4 inch lift. Thats a while a way though. I need to make some money first. Can anyone suggest a good lift kit that wont break the bank?
You could run the D30( cromo axles at least). I know many that do and they run hard trails. It depends on the right foot mod. You could find a take off from Rubi for much less than a new D44. Re gearing is getting expensive I feel your pain.

I think you can get upto 5:13 in the D30 but the Pin is very small.

Not a Tj guy, I went from a Cj to a Jk. But you get what you pay for, in Jeeps that is even more so. Cheeper lifts have cheep springs and parts. But this depends on what are you planning to do. Getting into wheeling and that leads to harder trails in the end for many. Jus a DD and looks is important.
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Unread 07-13-2013, 10:31 PM   #12
Spud100
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Slow... Welcome to jeep world.
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Unread 08-28-2013, 05:37 PM   #13
WJefy
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Your acceleration doesn't sound normal, especially with stock tire size. Check your air filter. If it stinks like sulfur after a hill climb, I'd also suggest checking the catalytic converter. Your description makes me think something is keeping the engine from breathing. Any heavy black smoke coming out the back?
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Unread 09-01-2013, 08:01 PM   #14
superj
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The two wheel drive jku have 4.10 gears stock in their rear axle. Find and and swap it on the back and then just swap the front to match. That should help. My wife's 2x4 07 jku is pretty damn quick light to light and does just fine in the hills and highway passing
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Unread 09-03-2013, 08:54 PM   #15
Spud100
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For the most part, factory gears are too high (to optimize gas mileage). Add some larger tires and it becomes a dog. Regearing will be the best money you will ever spend. Mine came with low 4:10s which is pretty low, but I'm considering going even one size lower.
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