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Old 08-30-2008, 06:24 PM   #31
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Quote:
Originally Posted by Jerry Bransford View Post
You keep ignoring the gearing suggestions and bringing up the supercharger. You really need to understand that a supercharger will NOT overcome an inappropriate axle gearing ratio, you really need to regear your axles to a more appropriate axle ratio first. Simply regearing both axles will give you huge across-the-powerband boost in torque. In other words, your gearing is like you're starting off in 2nd or 3rd gear right now. A supercharger would have to fight that. Regearing to match your tire size will restore the torque/power lost by having installed larger diameter tires. A supercharger is, flat out, the wrong way to fix that issue. Gear first, then you can add your supercharger if you still want it.
im not ignoring that, i had said in my previous post that i different front and rear axles. Probally Dana 44's with 4.10 gearing and detroit lockers.

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Old 08-30-2008, 06:32 PM   #32
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what will probally happen is ill get new 31" BFG A/T KOs since i need new tires soon. then bumpers/sliders/whinch. then will come the lift and M/Ts. Then finally the dana 44s and superchager. this is all over the next few years since i have 2 1/2 years in college left before i graduate and get a decent paying job.

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Old 08-30-2008, 10:22 PM   #33
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West Virginia Is Your Problem!

Unless you live in West Virginia, it's hard to imagine that most of the roads are not only winding with plenty of turns, but many have grades that clearly mean you can't drive in 5th, maybe in 4th, but often in 3rd. Many, and I mean many, roads have 9-12% grades. I live in the Appalachians in Maryland and our part of the state is "surrounded" by WV. Know that your vehicle is NORMAL but the roads in WV are not. That's why they call it "wild and wonderful"!
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Old 09-01-2008, 09:09 PM   #34
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lol i'd go with a twin screw and be done with it. 200% hp > 116% gain from gear change
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Old 09-16-2008, 05:46 PM   #35
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same thing

i have a 04 wrangler trail w/ 3.07 gears and 31x10.5 tires. i have the same issue going up even the slighest hill. what gears would u guys suggest for the bigger tires, and what tire pressure should i be running in them. thanks
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Old 09-16-2008, 05:55 PM   #36
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For 31" tires, 3.73 would be an ok ratio if you have a manual transmission. 4.10 wouldn't even be too low of a ratio, that is what the Rubicon comes with and it comes with 31" tires from the factory. 30-32 psi is about right for street pressure, you can go down to 12-13 psi for offroad.
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Old 09-16-2008, 06:00 PM   #37
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it is a manual trans 5 speed. thanks i think were running it a little to high i also get a slight vibe at 65-70 sometimes not all the time. there is a noise when u let off the clutch with the jeep in neutral. we took it and had it looked at they said it was norm. my hubby thinks there full of it.
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Old 09-16-2008, 06:07 PM   #38
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A faint tranny noise with the Jeep in neutral with the clutch pedal up actually is completely normal. That noise gets asked about maybe a 50 times a day in the various Jeep forums. It's just the sound of the transmission input shaft and gears rotating in neutral because they are being spun any time the clutch pedal is not being stepped on. You can hear it in a Jeep because 1) it's a truck transmission and a little noisier than in a car, and 2) because of the lack of sound proofing between the transmission and passenger compartment.
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Old 09-16-2008, 11:36 PM   #39
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all the talk about the superchargers does anyone have one and as for the gearing i think a stock jeep is geared too high to start with any upgrade in tires turns it into a bicycle without regearing i have a 05 auto i6 with 31x10.50 it struggles on flatland in od
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Old 09-17-2008, 12:17 AM   #40
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mknight, if i have the cash i would be driving a supercharged jeep in a heart beat
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Old 09-17-2008, 09:27 AM   #41
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what do you think would happen to the mpg with a supercharger on it we all know what happens when you raise the fun factor
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Old 09-17-2008, 12:24 PM   #42
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your mpg is going to drop significantly with a supercharger because it is sending more pressurized cooler air into the engine which also requires more fuel to be sent with it to make a larger more complete detonation aka more power. Also it causes more drag on the engine.
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Old 09-17-2008, 12:32 PM   #43
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your mpg is going to drop significantly with a supercharger because it is sending more pressurized cooler air into the engine which also requires more fuel to be sent with it to make a larger more complete detonation aka more power. Also it causes more drag on the engine.
Not to mention few would be able to keep their foot out of it after installing a supercharger.
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Old 09-17-2008, 12:48 PM   #44
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lol yeah, i thought that went without saying tho.
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Old 09-18-2008, 09:09 PM   #45
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I have the same problem in mine... except mine is on the highway period... 5th gear is weak and will not maintain speed... the guy who owned it before me put a 2 inch lift on it with 31" tires... no clue if he messed with the gears...
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Old 09-18-2008, 10:12 PM   #46
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i have an 05 auto 31 tires in od it has a hard time maintaining speed it runs around 1800rpm at 65 i think i need lower gears
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Old 09-19-2008, 10:21 AM   #47
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i have an 05 auto 31 tires in od it has a hard time maintaining speed it runs around 1800rpm at 65 i think i need lower gears
1800 rpms is too low at 65, do you plan to stay with 31" tires at the biggest?
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Old 09-19-2008, 02:01 PM   #48
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planning on going to 33x12.50 just having hard time decideng on which lift rim width 8 or 10 and what gears still debating right now
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Old 09-19-2008, 07:47 PM   #49
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1800 rpms is too low at 65
haha here we go again
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Old 09-19-2008, 08:13 PM   #50
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haha here we go again
Here you go again!
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Old 09-22-2008, 12:30 PM   #51
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get dana 44s 5.89 gearing, kenn bell super charger running 8.5psi, 6" suspension lift, 2" body lift, 37" Super Swamper Boggers and call it a day
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Old 09-22-2008, 01:08 PM   #52
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Jerry's 1000000 % correct!

A supercharger won't give you tah much on the bottom end anyway. They are good at mid to high R's.

You'd still have to backshift on the hills to take advantage of it.
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Old 09-22-2008, 04:13 PM   #53
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Here you go again!
are you driving at 1700 rpm with 65 mph to know?

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