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Old 08-16-2011, 12:29 AM   #31
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Quote:
Originally Posted by Diverdown87 View Post
Holy crap . Did you change your speedo gear????? My 98, 5sp, 6cyl, with stock 3.73's and same size tires as you only gives me a 4mph difference on the speedo. So when it shows me doing 65 I am actually doing 69 ( confirmed by the 74 in a 65 speeding ticket dropped down from 80 I got).

I am looking to go to 4.56's at tax time and will need to know which gear to buy to correct the issue.

As far as driving. I can hit a bridge here doing 70 and by the time I get to the top I got p!$$3d off people cussing me and am doing about 54. If I get a head wind I am screwed....
Just so you aren't mislead, it is not a static number. The inaccuracy increases the faster you go.

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Old 08-17-2011, 06:23 AM   #32
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How so? I kind of know what you're talking about I think. And I have 3.73 with 33s and I use 5th on the interstate. Going up long hills you lose a lot of power and momentum but otherwise it seems to be alright.
I agree. I use 5th every time I get on the highway.

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Old 08-17-2011, 07:42 AM   #33
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Just so you aren't mislead, it is not a static number. The inaccuracy increases the faster you go.
Correct, it isn't a static mph number. It is a static ratio or percentage number. For example if it's 10% off it is always 10% no matter how fast you go. At 50 mph it would be off by 5 mph, at 70 mph it would be off by 7 mph.... etc...


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Old 08-17-2011, 03:17 PM   #34
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i use 3.07's and i dont really notice a difference... but then again i don't floor it when i'm coming out of a stop sign or red light... i dunno... maybe i'm crazy
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Old 08-17-2011, 03:21 PM   #35
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Originally Posted by zzzpoohzzz
i use 3.07's and i dont really notice a difference... but then again i don't floor it when i'm coming out of a stop sign or red light... i dunno... maybe i'm crazy
I have 32s with steelies with 3.07s but I haven't noticed a difference at all either with a jump from my stock 225s
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Old 08-18-2011, 04:25 PM   #36
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I have 33x12.5x15. My speedo is off so here I'm going about 75-77 mph
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Old 08-18-2011, 04:37 PM   #37
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Those rpms are a little lower than I'd like, what ratio and transmission are you running?
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Old 08-18-2011, 04:40 PM   #38
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I think they are stock 3.07, but who knows what the PO put in.
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Old 08-18-2011, 04:47 PM   #39
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Probably 3.07, that's what I have and looks like my tach and speedo at that speed. That's my dilemma between 373 and 410 gears. Seems to be a dine line for the correct highway powerband there.
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Old 08-18-2011, 04:59 PM   #40
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I like my RPM's being low at that speed. As for power in the city, even with those tires my 4.0 is good on pick up.
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Old 08-18-2011, 05:05 PM   #41
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Ugh, my Jeep is dusty. I think 4.11 would be the best gears. I don't want to get in the 3ks for that speed.
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Old 08-18-2011, 05:08 PM   #42
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I would like to turn 28-29 hundred at 75 instead of 2500
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Old 08-18-2011, 05:12 PM   #43
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Lower RPMs means less gas. But I guess if you need to go faster then it would be easier at higher RPMs.
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Old 08-18-2011, 05:19 PM   #44
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Quote:
Originally Posted by danieldlg_13
Lower RPMs means less gas. But I guess if you need to go faster then it would be easier at higher RPMs.
Not necessarily.
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Old 08-18-2011, 05:25 PM   #45
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Do tell
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Old 08-18-2011, 05:41 PM   #46
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Quote:
Originally Posted by danieldlg_13
Do tell
I'm on my phone so I'm not going to type a book but here it goes as explained to me by Jerry Bransford.

Here we go. So the Jeep is shaped like a brick right? Not very aerodynamic, and it just gets worse once there is a lift added on. At highway speed its pushing through a LOT of air with all of its flat surfaces (grill, windshield, bumper, drag from the soft top, etc), and in order to so so, it needs power. More power than say, a Corvette, to push it through the same space. The Corvette has the nice sloped front end and is very streamlined so that it has very little air resistance comparitively. Okay so say at 60mph with 33" tires and 3.73s in 5th gear (how mine used to be set up) I'm sitting at 1800rpm. That's pretty low right? Low=less engine revolutions=less gas burned right? Wrong. Because of wind resistance, I have to put the accelerator on the floor to keep speed. Even though my rpms are low, I am dumping gasoline into the engine, using more gas than I would in 4th at 2700rpm. Okay so I swapped in 4.56. Same tires in 5th my rpm sits at 2100. Higher, but producing more power. Now my foot is lightly resting on the accelerator and I'm not dumping gas into the engine. I'm using less gas at a higher rpm to produce more power to push me through the air. Next, it gives the engine a mechanical advantage. When you jump from 3.73s and 30" tires to 3.73s and 33" tires, you're making the engine work harder. It has less leverage to use to spin the tire. Its like using a 3ft shovel to dig up 2ft rocks all day, the suddenly having to use the same shovel to dig up 4ft rocks. Wow that was a terrible analogy. Anyways, regearing gives you a 6ft shovel so you have more leverage to move those "rocks". Finally, those larger tires weigh more and require more energy to spin them (inertia and all) so you also use that power boost to move them.

In my personal experience I was getting 12-14mpg with the 4.0L, 5 speed, 3.73s, and 33" tires. When I switched to 4.56 I now get 16-19mpg depending on how I drive.

Also if I've made any mistakes someone with more experience please correct me

Edit: I forgot to add that apparently the 4.0L runs most efficiently at 2500-2700rpm
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Old 08-18-2011, 06:01 PM   #47
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Duly noted. Thank you for the explanation. With cars that are more aerodynamic it makes since but I guess not the Jeep.
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Old 08-18-2011, 06:05 PM   #48
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Dang it Invert!!!! You're making me really wanna regear now!!! My wallet is starting to hate you, btw.

Well, maybe I will regear one of these days...
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Old 08-18-2011, 06:22 PM   #49
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I have 33's and 4.10 gears on my 97 tj, 4.0 and a 6 inch susp lift and I run right at 3K rpms at 70 mph. And I'm only MAYBE at half throttle... There is plenty of skinny pedal left :-)... And she drives close to stock... Well alot better then most tj's I have ridden in :-)))
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Old 08-18-2011, 06:24 PM   #50
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Well said chaos, just glad I didn't have to type it on my phone....lol
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Old 08-18-2011, 06:28 PM   #51
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Originally Posted by danieldlg_13
Duly noted. Thank you for the explanation. With cars that are more aerodynamic it makes since but I guess not the Jeep.
Oh most definitely. That's why that Corvette idles down the highway at 70mph and gets 35mpg lol.

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Originally Posted by NCJeepin
Dang it Invert!!!! You're making me really wanna regear now!!! My wallet is starting to hate you, btw.

Well, maybe I will regear one of these days...
Ha it's worth it of you plan on sticking to a certain tore size! Lots of people spend the same amount of cash on programmers and CAIs and snake oil add ons to improve their butt dyno but never address the main issue.
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Old 08-18-2011, 06:40 PM   #52
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Ha it's worth it of you plan on sticking to a certain tore size! Lots of people spend the same amount of cash on programmers and CAIs and snake oil add ons to improve their butt dyno but never address the main issue.
Haha the PO put a CAI and throttle body spacer on my Jeep. But, at least it makes a cool whistling noise under hard acceleration..

But yea, I don't think I'll ever go above 35s on my Jeep. Because then, that's where the big $$$ mods come into play.

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