How to improve Automatic Transmission shifting? - JeepForum.com

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post #1 of 21 Old 06-03-2013, 08:41 PM Thread Starter
JSAN
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Join Date: May 2011
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How to improve Auto Tranny shifting? **Edit: Re-Programmed with Hypertech

Update:
So I uploaded the program to the ECM. First I went on the computer and updated the programmer and then Selected 2007 to 2010 3.7L Engine option and it updated it.

Then I went to the Jeep and installed it. First it gave me an error after the copying process (before writing) and told me to restart it.

After restarting it, it installed fine.

There is a very obvious difference in the acceleration. It accelerates pretty quickly now and even idles at little less RPMs than stock.

However My ESP light and traction control symbol stay lit in the instrument panel. What could be causing this?

I changed my tire size from 29.25 to 30.5. And kept everything else stock, in the programmer. anyone else have this problem?

----------------------------------------------------------------------

Hey guys,

I have noticed that the Automatic transmission shifting is really lousy.

For example, If I am on a two-lane highway and I have to overtake a Semi, The engine over-revs at some points while I'm over taking. I will be traveling 85-90Km/hr and I increase my speed to 120-125Km/hr when I'm overtaking. During this time the when I'm fueling the engine, it tends to hit 5K RPM and then settle right back to 3K.

I have also notice then going from stop to 70-80km/hr, the tranny over-revs sometimes to get into higher gear.

I am not abusing the transmission, just that I noticed it doesn't have good shift-points compared to other SUVs.

It's really noticeable when I get on the highways and there is a really short merge lane. So I have to go from 40km/hr coming from the ramp to 110km/hr or whatever the traffic speed is to properly merge in short amount of distance. During this time the tranny takes a while to shift into higher gears. Sometimes it even reaches close to redline before shifting up. This doesn't happen all the time though.


Can I add any Chips/programmers to improve the shifting? Has anyone done this and noticed any difference?

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post #2 of 21 Old 06-04-2013, 04:17 AM
ASK87
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2009 KK Liberty 
 
Join Date: May 2013
Location: UAE
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Same Here , Yep KK's transmission ain't Smooth at ALL , feels like some one under your seat makin Shifts with his hands

plus the wrong Sync. it's Creepy ,,

i wouldnt recommend playing with transmission unless with a certefied dealer , if u wanna do it right , it's gonna cost u like hell ,

That Being Said , dnt ask me why !! i Just love my Jeep ^_^
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post #3 of 21 Old 06-04-2013, 05:47 PM
Rob K
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1995 XJ Cherokee 
 
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Mine does the same thing. This is my first auto transmission so not being able to control the shift points is driving me crazy. Like you say the shift points aren't the best. I haven't looked into reprogramming yet, but will in the future when it's out of warranty.
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post #4 of 21 Old 06-04-2013, 06:30 PM
Gageraid
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Quote:
Originally Posted by Rob K View Post
Mine does the same thing. This is my first auto transmission so not being able to control the shift points is driving me crazy. Like you say the shift points aren't the best. I haven't looked into reprogramming yet, but will in the future when it's out of warranty.
A Hypertech programmer doesn't void warranty.
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post #5 of 21 Old 06-04-2013, 07:11 PM Thread Starter
JSAN
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I ordered the Hypertech programmer from amazon.com today. Should be here in 6-10 days. Total came to around $380 with shipping+Duties
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post #6 of 21 Old 06-04-2013, 11:06 PM
Rob K
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What are you getting for Hypertech programmers? I did a product search on their website and it looks like they don't support the Liberty. Only Grand Cherokee and Wrangler.
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post #7 of 21 Old 06-04-2013, 11:32 PM
Bmxer524
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Quote:
Originally Posted by Rob K View Post
What are you getting for Hypertech programmers? I did a product search on their website and it looks like they don't support the Liberty. Only Grand Cherokee and Wrangler.
Only certain year Libertys. It's some KJs(idk which years) and 08-10 KKs I believe.
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post #8 of 21 Old 06-05-2013, 08:54 AM
Gageraid
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Quote:
Originally Posted by JSAN View Post
I ordered the Hypertech programmer from amazon.com today. Should be here in 6-10 days. Total came to around $380 with shipping+Duties
When you first get it you'll have to connect the programmer, install the cd on your computer, and you're going to have to select JEEP LIBERTY or it won't work. They have good customer support, but I'd be glad to help if ya have any questions as I've had it over a year now.
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post #9 of 21 Old 06-05-2013, 03:54 PM
shawnicles
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Quote:
Originally Posted by JSAN View Post
I ordered the Hypertech programmer from amazon.com today. Should be here in 6-10 days. Total came to around $380 with shipping+Duties
I am looking at buying one as well to see what it does.

Let us know how it turns out when you get it. Do you have any other engine mods?
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post #10 of 21 Old 06-05-2013, 05:43 PM Thread Starter
JSAN
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Quote:
Originally Posted by shawnicles View Post
I am looking at buying one as well to see what it does.

Let us know how it turns out when you get it. Do you have any other engine mods?
none other than CAI
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post #11 of 21 Old 06-05-2013, 06:11 PM
Gageraid
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Quote:
Originally Posted by JSAN View Post
none other than CAI
Should see great results. I have the CAI and Gibson exhaust.
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post #12 of 21 Old 06-05-2013, 07:08 PM Thread Starter
JSAN
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Quote:
Originally Posted by Gageraid View Post
When you first get it you'll have to connect the programmer, install the cd on your computer, and you're going to have to select JEEP LIBERTY or it won't work. They have good customer support, but I'd be glad to help if ya have any questions as I've had it over a year now.
that sounds good.
thanks
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post #13 of 21 Old 06-05-2013, 07:55 PM
Gageraid
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By the way, I've only used the "regular" fuel setting so far. Haven't ventured out and tried the "premium" fuel setting yet. Wonder how it'd be with the extra mods.
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post #14 of 21 Old 06-05-2013, 09:42 PM Thread Starter
JSAN
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Quote:
Originally Posted by Gageraid View Post
By the way, I've only used the "regular" fuel setting so far. Haven't ventured out and tried the "premium" fuel setting yet. Wonder how it'd be with the extra mods.
yea, I'm gonna stick with 87 fuel. its $1.37/L for 87 up here. ($5.19/Gal)
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post #15 of 21 Old 06-05-2013, 10:29 PM
Gageraid
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Quote:
Originally Posted by JSAN View Post
yea, I'm gonna stick with 87 fuel. its $1.37/L for 87 up here. ($5.19/Gal)
That makes me sick.
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