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Old 08-20-2007, 05:47 AM   #31
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its 235/75/R15

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Old 08-20-2007, 05:52 AM   #32
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once u install it give me your opnion

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Old 08-20-2007, 08:25 AM   #33
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I installed my chip last night, and now I accelerate at a rate close to stock with these big tires. I'm happy with it It only cost me $30 off ebay, I highly recommend looking on ebay for parts
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Old 08-20-2007, 09:35 AM   #34
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Quote:
Originally Posted by tobycat1 View Post
I installed my chip last night, and now I accelerate at a rate close to stock with these big tires. I'm happy with it It only cost me $30 off ebay, I highly recommend looking on ebay for parts
Let's have some mpg data once you burn through a full tank. Assuming you've recalibrated your speedo.
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Old 08-20-2007, 11:13 AM   #35
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Wrangler - Oman,

I think we need to get to the basics here.... What are your specifications and what is the current mechanical status of your Jeep?

- Specs: Engine (4 or 6 cylinder), tranny (manual or auto), what gear ration on the axles , what tire size?

- Status: When was the last time the Jeep was serviced? Tune-up, new plugs, wires, fuel and air filters changed?

Lastly, you mention "i feel that its not giving me the power i want...." Is this your first Jeep? If you are use to driving a Corvette or a Cobra I will say the Jeep is a bit slower.

Welcome to the forum by the way. Please fil in the details and we can take another crack at it for you.
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Old 08-20-2007, 12:32 PM   #36
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to add on to MOz's post, welcome to the forum and sorry about jerry and toby's little pissing match
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Old 08-20-2007, 03:59 PM   #37
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my car enging in 6 cylinder manual tran, the gear ration and axles ( that i cant tell coz i dont know )
i will do the next servise soon by end of this week
i installed all these stuff maybe 1 year but gradually and my tires is the orginal rims 235/75/R15 the one jeep equipt with.
and i use to own 1994 but i fucked the engine nicly but then i sold it with lots of modd, stuff
the i bought the 2004 and i have installed the above stuff but still i cant feel it in the sands as well the road ,, maybe i look for more power and it not satisfying me coz i go much to sand hills

and thaks alot and i'm glad to be this forum member
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Old 08-20-2007, 04:01 PM   #38
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no worries man

thank you
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Old 08-20-2007, 07:20 PM   #39
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heres ur linky..

[yt]IhfIYz_Q9PY[/yt]

and heres my donuts

[yt]_8et9lwQIYU[/yt]

anyways donuts aside.. let say you are driving on the street with 30 miles on 3rd gear.. what rpm is ur gauge at? It also says the gear ratio on the differential cover.. its bolted on there.. So tomorow or whenever take a look at the rear differential.. there should be a little metal tab that says bunch of numbers.. i'm guessing yours will say 3.07 or 3.73.. i'm guessing urs is 3.07 though.
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Old 08-20-2007, 07:25 PM   #40
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WO,

I would like to add some intelligence to this discussion and talk mathmatically.

The purpose of the rear gears is to multiply the available torque produced my your engine to allow/cause easier or quicker acceleration.

I am going to assume that you have 3.73 gears in your Jeep, the gear the transmission is in will be constant between the different gear ratios, and that you regear to 4.56 gears.

I will also assume that losses in your drivetrain are negligible and = 0. This will insert some inaccuracy but it will be constant so we will ignore it.

Your engine is rated at 190 f/lbs of torque at approximately 3200 rpm. We will use this number as a baseline, realizing that at lower rpm it is much smaller.

With a stock 4.0 liter with stock gears then you should have:

190 ft/lbs X 3.73 = 708 ft/lbs of torque available at 3200 rpm, rated peak torque.

With 4.56 gears:

190 ft/lbs X 4.56 = 866 ft/lbs

This gear change results in an increase of 18% torque at the rear wheels. This is a real 18% and not some advertising claim or drive in horsepower increase. This increase is in the normal engine operating rpm. One of the real advantages of gears is the fact that you get stock torque numbers at 18% less engine rpm. This puts the torque to use where you need it on a Jeep - at low or stock engine rpm.

You probably could get an increase of 18% with a combination of some of the other performance enhancements, but it will most likely come at a higher rpm than stock and actually reduce the available torque at lower rpm.

Gears will make that 6 feel like it is a big block.......well maybe not quite that good, but they are the best, by far, performance increase you can get for your money.

FWIW...........

Hutch
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Old 08-20-2007, 07:29 PM   #41
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Actually here is what i found..

Engine liters...................4.0
Cylinder configuration.......I-6
Horsepower....................190-hp @ 4,600 rpm
Torque...........................235 lbs.-ft. @ 3,200 rpm
# of valves.....................12

Also i'm a bit confused with how the multiplying works.. Maybe i'm putting the torque on the wrong side of the equation..
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Old 08-20-2007, 07:31 PM   #42
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Actually here is what i found..

Engine liters 4.0
Cylinder configuration I-6
Horsepower 190-hp @ 4,600 rpm
Torque 235 lbs.-ft. @ 3,200 rpm
# of valves 12
You are correct, I used horsepower for torque.........how bad I am.........but, the percentage increase is the same for the gear change and that is what is important.

The gears alone will result in an 18% increase in torque at a given engine RPM.

Crap, old age sucks! LOL
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Old 08-20-2007, 08:16 PM   #43
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Salright. The explanation was good anyway!!!

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I feel everyday of my 52.
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Old 08-20-2007, 08:35 PM   #44
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Let's have some mpg data once you burn through a full tank. Assuming you've recalibrated your speedo.
I drive to irregular to get any accurate mpg data. I'm 17 remember, I don't care much about gas when I'm driving out of school. The extra power is great though.
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Old 08-20-2007, 09:03 PM   #45
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I don't care much about gas when I'm driving out of school.
I did that too the other day.. on my way out of college.. 46 in a 30.. $75 and 3 months supervision..
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Old 08-20-2007, 09:29 PM   #46
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For me, Its more about getting to 50 in a 45 as fast as I can get these big tires to turn. Plus I got a cop detector.
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Old 08-21-2007, 07:56 AM   #47
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So it sounds like your issues may be related to driving expectations.

What are you expecting from your Jeep when you go off-road? If you are looking to make a 20 foot rooster tail in the sand dunes, then you will need a lot more horespower. Driving in the sand will require much more power because of the increase in friction.

Have you tried de-pressurising "airing down" your tires when you are on the sand? By airing down your tires ( use a pressure gauge and set your tires to approx 10 psi) , you will essentially create a larger tire foot print and you will have better traction... Make sure you re-inflate your tires when you get back onto the road.

Let us know how this works for you.
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Old 08-21-2007, 10:17 AM   #48
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Quote:
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Driving in the sand will require much more power because of the increase in friction.
Or reduction of friction since sand has less traction than pavement.
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Old 08-21-2007, 10:38 AM   #49
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Is it your perrogitive to add negative value to these discussions or has someone designated you the site smart ass?

There is more friction (resistance) when you drive in the sand compared to the road.... check your physics. Traction is the ability to overcome frictional force.
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Old 08-21-2007, 11:50 AM   #50
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Is it your perrogitive to add negative value to these discussions or has someone designated you the site smart ass?

There is more friction (resistance) when you drive in the sand compared to the road.... check your physics. Traction is the ability to overcome frictional force.
we dubbed him and Bruins the site smart ass's cause you can never have just one .

and as far as I'm thinking, don't you have less "traction" in the sand? if that were the case then you would be able to move faster on the sand then on pavement, cause it would give you resistance that you can push off of to move forward.
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Old 08-21-2007, 04:33 PM   #51
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let me check out tomorrow and i will tell u all the details you required
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Old 08-21-2007, 04:40 PM   #52
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well your both right in a way

sand has a greater coefficient of friction the pavement does, but it is not solid, so when your tires turn the sand turns with the tires b/c 1 its not solid 2 it has higher friction so it doesnt le tthe tire slide over

so what you get is sand spraying out the back and you going slower!
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Old 08-21-2007, 05:14 PM   #53
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well your both right in a way

sand has a greater coefficient of friction the pavement does, but it is not solid, so when your tires turn the sand turns with the tires b/c 1 its not solid 2 it has higher friction so it doesnt le tthe tire slide over

so what you get is sand spraying out the back and you going slower!
I'm majoring in Conceptual Physics, and Debruins is 100% correct. The end result will be less traction, because sand is a loose particle. Pavement provides much more traction because of its solid and rough textured surface. Sand may require more power because of the tendency to "sink" in it. Hope that helps ya
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Old 08-21-2007, 05:27 PM   #54
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HE Shoots, He Scores! even with help from the 17 year old! j/k toby.
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Old 08-21-2007, 06:46 PM   #55
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HE Shoots, He Scores! even with help from the 17 year old! j/k toby.
Haha, yup. Debruins is 17 too if I remember correctly...
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Old 08-21-2007, 09:46 PM   #56
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Whoo Hoo, I got two 17yo's on my side don't I feel special. well at least you guys know what your talkin about most of the time.
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Old 08-21-2007, 09:49 PM   #57
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yeah i love physics!!!

i took physics last year and this yr im taking two senior physics classes and dropping spanish and band
should be a fun junior yr!

AAAHHH im gonna have SSOOO much work!
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Old 08-21-2007, 09:52 PM   #58
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band huh... well be prepared to hear the jokes now. and wait till you get to college they make you wanna kill yourself in physics. science is my best subject and I wanted to run the prof over after I got out of my classes. hey did I ever tell ya about this one time at band camp....
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Old 08-21-2007, 09:53 PM   #59
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Is it your perrogitive to add negative value to these discussions or has someone designated you the site smart ass?
Hmm i get called "pain in the butt" at work quite often too.. why that happens.. i dont know
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Old 08-21-2007, 10:06 PM   #60
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Whoo Hoo, I got two 17yo's on my side don't I feel special. well at least you guys know what your talkin about most of the time.
Thanks! I'm already a senior this year, So I can't take more physics till college. They only offer physics and honors physics here, and I already aced H Physics.

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