2.5 is VERY underpowered... What more can I do? - Page 5 - JeepForum.com

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post #61 of 75 Old 10-24-2011, 10:09 PM
ashland82391
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Originally Posted by jonzjeepyj View Post
I have done that also. What tire size are you running or want to run?
I am running 31x10.5x15 and plan to stay there doe to the cost of larger tires.

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post #62 of 75 Old 10-24-2011, 10:19 PM
moonshinefuel
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The 2.5 may be an under powered dog for the street, but for crawling, its all about gearing
http://www.jeepforum.com/forum/f176/...j-fan-1180112/
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post #63 of 75 Old 10-24-2011, 10:44 PM
jonzjeepyj
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I have run many set ups with many tire sizes with many gear ratios. For 31's
with a 2.5L and a 5 speed stick, your best gearing is 4.88's I absolutely loved
that combo. It ran very well with plenty of power in all 5 gears.

There is no problem that can't be fixed if you throw enough money at it.
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post #64 of 75 Old 10-24-2011, 10:48 PM
ashland82391
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Quote:
Originally Posted by jonzjeepyj View Post
I have run many set ups with many tire sizes with many gear ratios. For 31's
with a 2.5L and a 5 speed stick, your best gearing is 4.88's I absolutely loved
that combo. It ran very well with plenty of power in all 5 gears.
Im a new jeep owner so forgive me but how would I go about converting to 4.88s? Is the gearing in the axles or trans? How much does it cost?
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post #65 of 75 Old 10-24-2011, 10:54 PM
jonzjeepyj
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You must re gear the axles

Cost is . . . . .

1) Gear Set / Ring and pinion - $145.00 each set
2) Master install kit - $80.00 each set
3) Someone to set up and install them - $200 -TO- $400.00 per axle
4) Average cost is $500.00 -to-$600.00 per axle
5) $1000.00 -to- $1200.00 total cost

There is no problem that can't be fixed if you throw enough money at it.
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post #66 of 75 Old 10-24-2011, 11:00 PM
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I liked the way my YJ drove with 31's and stock gears. It might have been a bit sluggish to get up and go, but it drove very well. I'd like to think that 3200rpm and 50mph is reasonable in 3rd gear.

Probably very easily could have benefited from the e-fan upgrade and maybe even a 4.0 throttle body, 19lb injector and a throttle body spacer- all stuff you can pickup for cheap if you use the junkyard. Besides, the way I see it, Jeeps are a VERY personal thing so put whatever you want to put into it. As long as it makes you happy, who ****ing cares about what others think? 10-15hp is all that engine needs to do well everywhere with larger tires.

All about that unibody life.
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post #67 of 75 Old 10-24-2011, 11:03 PM
ashland82391
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Quote:
Originally Posted by jonzjeepyj View Post
You must re gear the axles

Cost is . . . . .

1) Gear Set / Ring and pinion - $145.00 each set
2) Master install kit - $80.00 each set
3) Someone to set up and install them - $200 -TO- $400.00 per axle
4) Average cost is $500.00 -to-$600.00 per axle
5) $1000.00 -to- $1200.00 total cost
Wow thank you for the information! i have some pretty mechanically savy family members so I wont have to worry about install $, so about 450$. Do you know what gear ratio is in a stock 93 jeep yj? Would this make a difference in gas? And would the offrading capabilities be compremised?
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post #68 of 75 Old 10-24-2011, 11:13 PM
kyle_craig
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Quote:
Originally Posted by ashland82391 View Post
Wow thank you for the information! i have some pretty mechanically savy family members so I wont have to worry about install $, so about 450$. Do you know what gear ratio is in a stock 93 jeep yj? Would this make a difference in gas? And would the offrading capabilities be compremised?
Re-gearing is the only thing that will make you happy. I say start ordering parts. Your Dana 35 will be fine with 31s unless you are absolutely brutalizing it. Put some 4.88 gears in the axles and it will feel like a hot rod compared to your factory 4.10 gears. The 2.5L needs to be at 3000 revs to make power/maintain speed on an incline. As far as off-road capability, your low range will be even slower because of the re-gear. This is a good thing because once again, the engine needs higher revs to make power.

On a side note, I run 4.88s with 35s and maintain 60 mph in 3rd up any mountain pass in Colorado. It will also hold 5th gear going 80 on flat freeway with ease. I consistently get 18 mpg with 35s...I'd imagine with smaller tires it could be even better.
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post #69 of 75 Old 10-24-2011, 11:17 PM
ashland82391
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Quote:
Originally Posted by kyle_craig View Post
Re-gearing is the only thing that will make you happy. I say start ordering parts. Your Dana 35 will be fine with 31s unless you are absolutely brutalizing it. Put some 4.88 gears in the axles and it will feel like a hot rod compared to your factory 4.10 gears. The 2.5L needs to be at 3000 revs to make power/maintain speed on an incline. As far as off-road capability, your low range will be even slower because of the re-gear. This is a good thing because once again, the engine needs higher revs to make power.

On a side note, I run 4.88s with 35s and maintain 60 mph in 3rd up any mountain pass in Colorado. It will also hold 5th gear going 80 on flat freeway. I consistently get 18 mpg with 35s...I'd imagine with smaller tires it could be even better.
thanks alot
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post #70 of 75 Old 10-24-2011, 11:18 PM
jonzjeepyj
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kyle_craig wrote:

Quote:
Re-gearing is the only thing that will make you happy. I say start ordering parts. Your Dana 35 will be fine with 31s unless you are absolutely brutalizing it. Put some 4.88 gears in the axles and it will feel like a hot rod compared to your factory 4.10 gears. The 2.5L needs to be at 3000 revs to make power/maintain speed on an incline. As far as off-road capability, your low range will be even slower because of the re-gear. This is a good thing because once again, the engine needs higher revs to make power.

On a side note, I run 4.88s with 35s and maintain 60 mph in 3rd up any mountain pass in Colorado. It will also hold 5th gear going 80 on flat freeway. I consistently get 18 mpg with 35s...I'd imagine with smaller tires it could be even better.
X2 Right on the money !

There is no problem that can't be fixed if you throw enough money at it.
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post #71 of 75 Old 10-24-2011, 11:20 PM
nembudonna
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Every buddy look. A 4cyl will never be as fast as a 6cyl, and a 6cyl will never be as fast as an 8cyl. But when I'am in my jeep with my best friend Hooter, I'am in no hurry to get there. End of thread.
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post #72 of 75 Old 10-24-2011, 11:21 PM
ashland82391
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I have one more question. What is the master install kit? Is that the correct name for it? Is there any othere information I need to know about it when looking it up for puchase?
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post #73 of 75 Old 10-24-2011, 11:34 PM
jonzjeepyj
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It has the shims, seals and gaskets to install the Ring and pinion gear sets.
Yes, that's what it is called a Master Install Kit.

There is no problem that can't be fixed if you throw enough money at it.
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post #74 of 75 Old 10-24-2011, 11:45 PM
ashland82391
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Quote:
Originally Posted by jonzjeepyj View Post
It has the shims, seals and gaskets to install the Ring and pinion gear sets.
Yes, that's what it is called a Master Install Kit.
thanks alot guys you really saved me alot of research! Is there anything else you think I should no before diving into this project? And do you guys know anything about a 2.4L 4 banger in the yj's?
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post #75 of 75 Old 10-25-2011, 12:03 AM
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Quote:
Originally Posted by ashland82391 View Post
thanks alot guys you really saved me alot of research! Is there anything else you think I should no before diving into this project? And do you guys know anything about a 2.4L 4 banger in the yj's?
Stop while you're ahead.

Go back & read the entire thread. Pay close attention to those who have been there & done that.

Then start another thread if you still don't know.

Too much running of the mouth goin' on in here.

closed for now.
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