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Old 08-29-2007, 06:47 PM   #1
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hp

Whats the most hp ever out of a 4.0? What are the best mods for the engine to increase the hp?

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Old 08-29-2007, 07:06 PM   #2
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give it 2 more cylinders and shape it like this -V

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Old 08-29-2007, 07:08 PM   #3
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Depending on the year, they can have up to 190Hp.

Make more power out of the 4.0L is never easy. Its either, a Supercharger, or stroker to make more power. After that, its maybe 40Hp at the most.

Are you trying to make more power because of bigger tires? Did you regear the axles yet?
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Old 08-29-2007, 10:00 PM   #4
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No, mines still stock but I wouldn't mind a little extra power without an engine swap or regearing.
How much more horsepower can you get with a cold air intake, tbs, header and performance exhaust without a cat convertor, and a chip?
Would an msd ignition make more power or increase MPG?

Thanks for all the help, im new to the jeep thing
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Old 08-29-2007, 10:11 PM   #5
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On the 4.0L... its pretty much useless. In stock form, your Wrangler should be pretty peppy.

And if your asking any Jeep owner how to increase MPG, you bought the wrong vehicle.
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Old 08-29-2007, 10:43 PM   #6
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If you do a search this topic has been beaten to death. If you want more power be ready to pay out the arse. Sorry but theres hardly any cheap bolt on upgrades thats going to give you street rod performance.

Heard this stuff packs a kick?

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Old 08-30-2007, 10:15 PM   #7
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Quote:
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And if your asking any Jeep owner how to increase MPG, you bought the wrong vehicle.
hmm how about one of my aerodynamic bumpers?

as hp goes.. i have nearly the entire system.. i can notice my rig is different since now the power from low rpm has gone up to high rpm but besides that.. not enough.

Boost would be the best power adder and most cost efficient but most expensive as well. (best bang for the buck though)

the cheapest boost setup i've seen is 4k and i think the turbo kit i've seen is also around that much.. 280hp at the wheels and over 330lb-ft. There was another one i looked at few days ago that gives 30% increase that was cheap but was nuthing but a scam so..
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Old 08-31-2007, 12:09 AM   #8
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Gears are the answer. Save your money and buy gears....the lower the better.
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Old 08-31-2007, 12:13 AM   #9
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But his TJ is stock... so regearing wouldn't be right.
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Old 08-31-2007, 12:48 AM   #10
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But his TJ is stock... so regearing wouldn't be right.
It is my opinion, and it is just an opinion, that gears are the first mod to make. I don't think you can go too low if you have at least 31 inch tires. My Rubicon had 31s stock and 4.11s (sorry for stating the obvious, but some newer Jeepers might not know). I don't think 4.88s would be too low except if you were driving on the highway 99% of the time.

4.88s would have put the highway engine RPM at approximately 3300 RPM. Sounds like a lot, but the torque peak of the engine is at 3200. It should be very happy at 3300.

I think people tend to get hung up on HP numbers. Again it is my opinion that HP is almost meaningless for a Jeep. We are interested in torque. Gears multipy torque and will definatly make you Jeep feel like it has more power, even though it doesn't. It is just operating at a different spot on the torque curve.

Again, just my opinion, and we all know about opinions don't we!

On the other hand, if someone wants to spend money on all the add on HP stuff.......more power to 'em. I wish them the best and hope the results are what they wanted. But if not, gears just might help!
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Old 08-31-2007, 01:00 AM   #11
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But again, its stock. And spending money on lower gears would be like hoping for 5hp out of an intake kit. Horsepower or torque it doesn't matter. The stock gears are plenty in stock form. He's just got the wrong mind set for this type of vehicle.

IMO - opinions, they sucks But I agree with ya Hutch.
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Old 08-31-2007, 01:22 AM   #12
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............ He's just got the wrong mind set for this type of vehicle.
This is most likely very true.......but that is just my opinion too.....
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Old 08-31-2007, 05:57 AM   #13
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275-300hp is about the max you will get from a 4.0L That's with spending a lot of $$ and time, and why most swap in something bigger made for that kind of HP. For minor gains say 10-15hp, the cold air intake and exhaust will bump you up a bit.
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Old 08-31-2007, 07:23 AM   #14
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Hutch is right on... Torque is measure of the engines actual output... HP is the measure of an engines ability to apply that torque.... So they are actualy useless without eachother... getting more of one without the other is kind of pointless. Those bolt ons will give you like 15HP for droppin like $600. But without a gain in torque, you wont notice it unless you are running it up to redline before each shift.

Short answer is... if you want better gas mileage and a faster vehicle... buy a Mustang GT or an F-Body
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Old 08-31-2007, 09:38 AM   #15
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=hutchman;Again it is my opinion that HP is almost meaningless for a Jeep. We are interested in torque. Gears multipy torque and will definatly make you Jeep feel like it has more power, even though it doesn't. It is just operating at a different spot on the torque curve.
I agree with you.

I drove the early dodge ram models (1979 -1980) and in those things u must use 2nd gear enstead of 1rst to move it,1st gear was too strong to use it, it is only to pull stuff or in 4 lo .
I don't know but this is how I would like to feel my TJ some day....
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Old 08-31-2007, 10:48 AM   #16
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then regear!!

i agreee regearing is the way to go, you will get a lot more pep/ better acceleration from that, also remember the most horsepower to mpg is found at the top of the torque curve so if you can get your highway speed around 3 grand you may actually save gas, or at least have more hp for the same gas,
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Old 08-31-2007, 06:21 PM   #17
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If this is all true why would anyone spend upwards of $300 for a cold air intake and even more for an exhaust for minimal power gains!?
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Old 08-31-2007, 06:27 PM   #18
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because it sounds cool.. i got the whole system but headers.. the intake and the bored out throttle body whisles.. the exhaust rumbles.. I might have gotten maybe 10-15 horses with everything i got. My engine pretty much lost some low end and gained top end so now it feels faster since when at low rpm its slow and then it pulls harder and harder. I even have that little tiny jump in power at around 2500rpm of a turbo "spooling"

I may have gotten more but i cannot say because no dyno... still though it does feel different than stock.
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Old 08-31-2007, 06:28 PM   #19
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Some heeps come with 3.07 gears. That is rediculous, for any kind of performance. Like someone already stated, the rubicon comes with 4.10 gears, and anything less, is well, just plain under powered. That is the first upgrade to make. Gears!!!!!!!!!

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