here is my dilemma - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-11-2012, 07:36 PM   #1
Newb
 
Join Date: Mar 2012
Location: So. Cal.
Posts: 7
here is my dilemma

I have 2001 wrangler tj. 4 cyl.2.5 / 58.000 mi., my jeep loses power on any "slight" uphill on highway it goes from "55mph" to say about "35mph" and i cannot get it to go any more faster even at a lower gear, does anyone have any suggestions on what may be causing this? (but never a problem on straight/flat surface highway)flawless on flat surface highway. Please let me know.

mg3611 is offline   Quote Quick Reply
Old 03-11-2012, 07:59 PM   #2
Jeeper
 
stuckinwater's Avatar
 
Join Date: Nov 2011
Posts: 2,426
Quote:
Originally Posted by mg3611
I have 2001 wrangler tj. 4 cyl.2.5 / 58.000 mi., my jeep loses power on any "slight" uphill on highway it goes from "55mph" to say about "35mph" and i cannot get it to go any more faster even at a lower gear, does anyone have any suggestions on what may be causing this? (but never a problem on straight/flat surface highway)flawless on flat surface highway. Please let me know.
Gears? That's the only thing I can think of. Shorter gears could possibly fix it. Go you know what gears you have?

__________________
Yeah, its got a HEMI!
stuckinwater is offline   Quote Quick Reply
Old 03-11-2012, 08:03 PM   #3
Jeeper
 
InvertChaos's Avatar
 
Join Date: Sep 2010
Location: NoVa
Posts: 7,879
What size tire?
__________________
|2004 Jeep TJ "Green Machine"|4.0L 5 speed Dana44|33x12.50x15 Goodyear Duratracs|2.5" RC coils + 1.25" body lift|OME NitroSport shocks|4.56 gears|Skid Row Engine Skid|BCC Sliders|Currie AntiRock|
InvertChaos is offline   Quote Quick Reply
Old 03-11-2012, 09:27 PM   #4
Newb
 
Join Date: Mar 2012
Location: So. Cal.
Posts: 7
tire size is 31
mg3611 is offline   Quote Quick Reply
Old 03-13-2012, 04:01 PM   #5
Jeeper
 
Gesedl's Avatar
 
Join Date: Mar 2012
Posts: 32
I have a 2000 TJ and had the same issue - couldnt get it over 65 with the wind at my back and going uphill was dangerously slow. I got rid of the 31s and went to the very tall 225s/17 inchers that are on the new wranglers and added a aftermarket cat-back exhaust and a K&N filter - I can hit 75 now without to much of a problem. Im not sure which mod made the most difference but between the three I dont worry about being run over by a semi anymore. This ended up being a lot cheaper then re-gearing the rear-end which was what the guy at 4WD.COM told me I would need to do with the 31s.
Gesedl is offline   Quote Quick Reply
Old 03-13-2012, 06:05 PM   #6
Jeeper
 
neverfastenough1's Avatar
 
Join Date: Nov 2010
Location: Savannah, Ga
Posts: 925
Quote:
Originally Posted by Gesedl View Post
I have a 2000 TJ and had the same issue - couldnt get it over 65 with the wind at my back and going uphill was dangerously slow. I got rid of the 31s and went to the very tall 225s/17 inchers that are on the new wranglers and added a aftermarket cat-back exhaust and a K&N filter - I can hit 75 now without to much of a problem. Im not sure which mod made the most difference but between the three I dont worry about being run over by a semi anymore. This ended up being a lot cheaper then re-gearing the rear-end which was what the guy at 4WD.COM told me I would need to do with the 31s.
Maybe you have the same problem ^ has. Nothing he said actually made sense, to me anyways, but the one factor that he changed his AIR FILTER. Thats the only thing out everthing he said that would actually make a difference in power. Not saying a K&N helps a lot, but when you are replacing a clogged air filter it does. When you go to larger tires, it should be followed by lower gears like the rep at 4wd.com said, especially with a 4 cyl. I don't know how much power you would lose with 31's, but 33's will definately hurt power.
neverfastenough1 is offline   Quote Quick Reply
Old 03-13-2012, 08:33 PM   #7
Jeeper
 
Gesedl's Avatar
 
Join Date: Mar 2012
Posts: 32
Nothing I said made sense? I listed three factors that possibly increased my HP and/or speed. I thought I stated that fairly simply. I could write in crayon I suppose.
Gesedl is offline   Quote Quick Reply
Old 03-13-2012, 08:36 PM   #8
Jeeper
 
Jeeplover1's Avatar
 
Join Date: Mar 2012
Location: Arkansas
Posts: 15,529
has it always done this? If not it could be bad gas, filter, plugs, numerous issues start replacing the cheaper things and work your way up! Might just need a tune up
Jeeplover1 is offline   Quote Quick Reply
Old 03-13-2012, 09:37 PM   #9
Jeeper
 
neverfastenough1's Avatar
 
Join Date: Nov 2010
Location: Savannah, Ga
Posts: 925
Quote:
Originally Posted by Gesedl View Post
Nothing I said made sense? I listed three factors that possibly increased my HP and/or speed. I thought I stated that fairly simply. I could write in crayon I suppose.
I said it didn't make sense to me, but I am positive others were thinking the same thing. It has been proven that adding a K&N filter does nothing, unless of course your original is clogged. Everyone knows that larger tires are harder to turn and require lower gears the larger you go. Catback? Do you really think adding a free flowing exhaust right behind the cats (the most restricted part of the exhaust) adds that much power. Catback will only flow as much exhaust as your heads and cats will let it. It is mainly only going to give you a different sound. No sir, I don't need you to write it in crayon.
neverfastenough1 is offline   Quote Quick Reply
Old 03-13-2012, 09:55 PM   #10
Jeeper
 
CarloC's Avatar
 
Join Date: Feb 2012
Posts: 105
Does it loose the power after running for a little while? If so when this happens pull over and look under the jeep and see if the cat converter is glowing red. you might have a bad cat in their.
CarloC is offline   Quote Quick Reply
Old 03-13-2012, 10:28 PM   #11
Newb
 
Join Date: Mar 2012
Location: So. Cal.
Posts: 7
Can you please provide more "detailed" info. on the exhaust like the one you installed, (brand, type, where purchased, also on the K&N filter is it just a replacement filter or the High performance air intake kit?, Thank You.
mg3611 is offline   Quote Quick Reply
Old 03-13-2012, 10:33 PM   #12
Jeeper
 
Gesedl's Avatar
 
Join Date: Mar 2012
Posts: 32
Quote:
Originally Posted by neverfastenough1 View Post
I said it didn't make sense to me, but I am positive others were thinking the same thing. It has been proven that adding a K&N filter does nothing, unless of course your original is clogged. Everyone knows that larger tires are harder to turn and require lower gears the larger you go. Catback? Do you really think adding a free flowing exhaust right behind the cats (the most restricted part of the exhaust) adds that much power. Catback will only flow as much exhaust as your heads and cats will let it. It is mainly only going to give you a different sound. No sir, I don't need you to write it in crayon.
Proven that it does nothing? So you just stated Cat-back exhausts and K&N air filters are worthless in adding performance or horsepower. Can you back that up with a dyno test or some real factual information? Because if your right then im sure we can sue a whole boatload of manufacturers who claim otherwise, in writing I may add and with scientific testing including dynometers.. Heres just a couple of excerpts from some popular websites:

Borla referencing their cat-back exhaust:
An engine is an air pump, and BORLA's exhaust system allows the engine to pump and flow more uninterrupted air. The actual horsepower increase depends upon the fuel management system's ability to provide the right amount of fuel to match the extra air flow; 5 to 15% increases are not uncommon.

Magnaflow on their cat-back exhaust:Question: How much horsepower can I expect to gain?Answer:It's different for every car, but typically expected gains are in the average range of 10%. Replacing the muffler/exhaust with a MagnaFlow will help your engine increase power by being able to expel exhaust gases quicker. This creates less workload for the engine, makes it run more efficient, and results in better power.


Here is Magnaflows info on exhaust horsepower gains along with their website link which shows their dyno testing and testing conditions in case your dubious.. MagnaFlow Exhaust - How MagnaFlow Dyno's a Vehicle

Here is what K&N has to say:The K&N FilterCharger® air filter is designed to achieve high, virtually unrestricted air flow while maintaining filtration levels critical to ensure long engine life. Our automotive OE (original equipment) replacement air filters generally add 1-4 horsepower.

So please explain why slightly smaller tires, a less restrictive exhaust and a unrestricted air filter do not explain some horsepower gain?
Gesedl is offline   Quote Quick Reply
Old 03-13-2012, 10:45 PM   #13
Jeeper
 
Gesedl's Avatar
 
Join Date: Mar 2012
Posts: 32
Quote:
Originally Posted by mg3611 View Post
Can you please provide more "detailed" info. on the exhaust like the one you installed, (brand, type, where purchased, also on the K&N filter is it just a replacement filter or the High performance air intake kit?, Thank You.

Im not saying that adding an air filter and a new exhaust will make your car go 20mph faster. What I am saying is it definitely helped me gain just enough speed, approx 7-9mph at highway speeds along with slightly smaller tires. Take it for what its worth. I added the K&N High-Performance filter only, no intake yet. The Cat-back exhaust was from Rugged Ridge and it was not stainless steel and it cost around $250ish, not on sale. I would start with the cheaper stuff before I go changing your gearing. Good luck!
Gesedl is offline   Quote Quick Reply
Old 03-13-2012, 11:16 PM   #14
Jeeper
 
neverfastenough1's Avatar
 
Join Date: Nov 2010
Location: Savannah, Ga
Posts: 925
Quote:
Originally Posted by Gesedl View Post
Proven that it does nothing? So you just stated Cat-back exhausts and K&N air filters are worthless in adding performance or horsepower. Can you back that up with a dyno test or some real factual information? Because if your right then im sure we can sue a whole boatload of manufacturers who claim otherwise, in writing I may add and with scientific testing including dynometers.. Heres just a couple of excerpts from some popular websites:

Borla referencing their cat-back exhaust:
An engine is an air pump, and BORLA's exhaust system allows the engine to pump and flow more uninterrupted air. The actual horsepower increase depends upon the fuel management system's ability to provide the right amount of fuel to match the extra air flow; 5 to 15% increases are not uncommon.

Magnaflow on their cat-back exhaust:Question: How much horsepower can I expect to gain?Answer:It's different for every car, but typically expected gains are in the average range of 10%. Replacing the muffler/exhaust with a MagnaFlow will help your engine increase power by being able to expel exhaust gases quicker. This creates less workload for the engine, makes it run more efficient, and results in better power.


Here is Magnaflows info on exhaust horsepower gains along with their website link which shows their dyno testing and testing conditions in case your dubious.. MagnaFlow Exhaust - How MagnaFlow Dyno's a Vehicle

Here is what K&N has to say:The K&N FilterCharger® air filter is designed to achieve high, virtually unrestricted air flow while maintaining filtration levels critical to ensure long engine life. Our automotive OE (original equipment) replacement air filters generally add 1-4 horsepower.

So please explain why slightly smaller tires, a less restrictive exhaust and a unrestricted air filter do not explain some horsepower gain?
Lol, you beleive what the seller claims. 1 to 4 hp. Up to x hp. That means if it gains anything they are covered.
neverfastenough1 is offline   Quote Quick Reply
Old 03-15-2012, 05:56 AM   #15
Newb
 
Join Date: Mar 2012
Location: So. Cal.
Posts: 7
Ok, Thank You.
mg3611 is offline   Quote Quick Reply
Old 03-15-2012, 06:12 AM   #16
Jeeper
 
CoyoteOn2's Avatar
 
Join Date: Jan 2012
Location: Palisade, Colorado
Posts: 698
__________________
Those that go through life afraid,
Die many deaths......................
Those that DO NOT, DIE ONLY ONCE
But Hey~~~What do I Know ¿
CoyoteOn2
CoyoteOn2 is offline   Quote Quick Reply
Old 03-15-2012, 06:32 AM   #17
Jeeper
 
Ichabod's Avatar
 
Join Date: Oct 2011
Location: Between light and shadow
Posts: 306
Quote:
Originally Posted by neverfastenough1 View Post
Maybe you have the same problem ^ has. Nothing he said actually made sense, to me anyways, but the one factor that he changed his AIR FILTER. Thats the only thing out everthing he said that would actually make a difference in power. Not saying a K&N helps a lot, but when you are replacing a clogged air filter it does. When you go to larger tires, it should be followed by lower gears like the rep at 4wd.com said, especially with a 4 cyl. I don't know how much power you would lose with 31's, but 33's will definately hurt power.

Air filters and exhaust aside, dropping bigger tires for for closer to factory makes perfect sense. Pretty much everyone on the site would agree that a 4 banger with 31s is going to lose power on an highway uphill, and you seem to agree that the filter was an improvement, so my guess is that you only disagree about the exhaust mod, and you're just being sarcastic about nothing he said making sense?
__________________
"Fire it on up and let's cruise a while, leave your troubles far behind"

Felder, 1981
Ichabod is offline   Quote Quick Reply
Old 03-15-2012, 07:36 AM   #18
Jeeper
 
SinfulDragon's Avatar
 
Join Date: Jun 2011
Location: Indiana
Posts: 981
Nope, I don't believe he is being sarcastic. The filters don't help. Do a search here, its covered up and down WITH LINKS TO THE DYNO PULLS for everyone requesting those. I have one in my jeep, replaced with a stock filter, I wasn't surprised to not see a lick of difference according the the butt dyno.
The tire size makes sense.
Then sure, his exhaust could have been fucked so a new one helped. his old filter was a block of wood so anything new helped. We don't know the variables.
Please god, draw it out in crayon for me. the more colors the better.
SinfulDragon is offline   Quote Quick Reply
Old 03-15-2012, 07:51 AM   #19
Jeeper
 
Join Date: May 2010
Posts: 2,221
Quote:
Originally Posted by mg3611 View Post
does anyone have any suggestions on what may be causing this?
The 4 cylinder engine and/or improper gearing. What you've described is pretty much a given with the 4-banger, and that is exactly why I ditched the 2.5l. There are very few flat roads or highways around here, so driving anywhere was pretty painful.
geiman is offline   Quote Quick Reply
Old 03-15-2012, 08:58 AM   #20
Jeeper
 
Ichabod's Avatar
 
Join Date: Oct 2011
Location: Between light and shadow
Posts: 306
Re-read what I quoted there, Mr. Dragon. He says nothing makes sense, then more or less says that he agrees with the filter and tire change.

I would happily write in crayon for you if I could. I like crayons.
__________________
"Fire it on up and let's cruise a while, leave your troubles far behind"

Felder, 1981
Ichabod is offline   Quote Quick Reply
Old 03-15-2012, 11:13 AM   #21
Jeeper
 
Gesedl's Avatar
 
Join Date: Mar 2012
Posts: 32
You guys really crack me up! Here is the closest I can come to crayon. Simply put, more air into your engine “CaN” produce more power in the right circumstances! ANd yes a less restrictive exhaust can help power also.
Gesedl is offline   Quote Quick Reply
Old 03-15-2012, 11:16 AM   #22
Jeeper
 
SinfulDragon's Avatar
 
Join Date: Jun 2011
Location: Indiana
Posts: 981
HA!
Love the crayon "effect"!
SinfulDragon is offline   Quote Quick Reply
Old 03-15-2012, 11:58 AM   #23
Jeeper
 
Ichabod's Avatar
 
Join Date: Oct 2011
Location: Between light and shadow
Posts: 306
Mybe we could get together and invent a crayon font for computer. With big sloppy backwards letters and stuff.

I'd use that all the time, and maybe we could get rich!
__________________
"Fire it on up and let's cruise a while, leave your troubles far behind"

Felder, 1981
Ichabod is offline   Quote Quick Reply
Old 03-15-2012, 12:02 PM   #24
Jeeper
 
Ichabod's Avatar
 
Join Date: Oct 2011
Location: Between light and shadow
Posts: 306
BTW, I personally wouldn't go to the expense adding the filters, intake or exhaust, it just wouldn't be worth the money for what you would gain.

MANY MANY threads have covered that in the past, and it will be debated endlessly as long as there are 4 cyl wranglers.

Works great on a muscle car though
__________________
"Fire it on up and let's cruise a while, leave your troubles far behind"

Felder, 1981
Ichabod is offline   Quote Quick Reply
Old 03-15-2012, 09:49 PM   #25
Newb
 
Join Date: Mar 2012
Location: So. Cal.
Posts: 7
"Gesedl" can you give me the Specs. for your "Tire size". (im going to start w/tires)Thanks.
mg3611 is offline   Quote Quick Reply
Old 03-15-2012, 10:03 PM   #26
Jeeper
 
neverfastenough1's Avatar
 
Join Date: Nov 2010
Location: Savannah, Ga
Posts: 925
Quote:
Originally Posted by Ichabod View Post
Air filters and exhaust aside, dropping bigger tires for for closer to factory makes perfect sense. Pretty much everyone on the site would agree that a 4 banger with 31s is going to lose power on an highway uphill, and you seem to agree that the filter was an improvement, so my guess is that you only disagree about the exhaust mod, and you're just being sarcastic about nothing he said making sense?
Yeah, he threw me off when he said he swapped his 31's for the very tall tire on the new Wranglers. Either way, as far as I know, the new Wranglers come with 225/75R17 or 255/75R17. The first being 30.5" and the second being 31.5, so no still doesn't make sense because I don't think half inch smaller will have that drastic of a change in performance.
neverfastenough1 is offline   Quote Quick Reply
Old 03-15-2012, 10:40 PM   #27
Jeeper
 
div4gold's Avatar
 
Join Date: Feb 2012
Location: WA
Posts: 506
Bad catalytic converter, plugged up .
div4gold is offline   Quote Quick Reply
Old 03-16-2012, 06:23 AM   #28
Jeeper
 
Ichabod's Avatar
 
Join Date: Oct 2011
Location: Between light and shadow
Posts: 306
Quote:
Originally Posted by mg3611 View Post
"Gesedl" can you give me the Specs. for your "Tire size". (im going to start w/tires)Thanks.
He said he has the 225/17. If you have factory wheels, you should have 15s on a 2000 TJ.

Factory size on a Jeep that year was 215-75-15, on the SE, some Sports and Saharas went up to 225s.

I've got 235s on my 97, and I haven't noticed a significant drop in power.

But, it's a 2.5, none of the four cylinders are known for burning up the interstate.
__________________
"Fire it on up and let's cruise a while, leave your troubles far behind"

Felder, 1981
Ichabod is offline   Quote Quick Reply
Old 03-17-2012, 01:18 AM   #29
Jeeper
 
Gesedl's Avatar
 
Join Date: Mar 2012
Posts: 32
The 225/75/17s .No converter was not plugged up and no air box wasn't plugged up.
Gesedl is offline   Quote Quick Reply
Old 03-17-2012, 09:12 PM   #30
Newb
 
Join Date: Mar 2012
Location: So. Cal.
Posts: 7
thanx.

mg3611 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is there a shop to fix Death Wobble for sure? khoavu WF New Member Check In 11 03-15-2012 10:15 PM
my hood scoop i custom put on my yj Bs13855 YJ General Discussion Forum 19 03-12-2012 10:05 PM
What is this?? SippiTJ Pictures Forum 5 03-11-2012 08:49 PM
here is my dilemma mg3611 WF Site Help & Support 3 03-11-2012 08:08 PM
Is it worth a JK over TJ for light lift and offroading? Moroney167 JK General Discussion Forum 1 03-11-2012 06:34 PM



» Featured Product

All times are GMT -5. The time now is 09:16 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC