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Unread 08-17-2010, 09:43 PM   #1
JeepMaster
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How To Get +300 HP Out of my Engine ?

What steps are the best to reach over 300 hp's? I like to drive fast and 200 HP just isnt cutting it. My Jeep is a 2008 stock 4dr JK with stock tires.

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Unread 08-17-2010, 09:54 PM   #2
KPJ
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From all I have read you have two options, maybe three to get real, measurable HP and torque gains. Swap, supercharge programmer.

Swap to a Hemi - there are several outfits/shops which do this. AEV, Burnside (?) Offroad and Jeep Speed Shop are three I've read of, I have an AEV built Jeep on the way.
Instal a RIPP supercharger kit
Instal a Hesco supercharger kit

Also, Jeep Speed Shop does Chevy engine swaps I hear, but I'm not sure if they have the computer bugs worked out yet.

For less gain, you can try Superchips or one of the other programers.

There isn't much in the way of aftermarket HP/torque gear available for the 3.8.

I'm sure others will chime in with other possible options.

JPK
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Unread 08-17-2010, 09:58 PM   #3
robd2003
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Buy a grand cherokee srt8 and dont waste time on going fast in a wrangler. Save us all by driving within speed limits.

Ive see lots of very very mangled vehicles, and cant even start to think about how if at all anyone survived.

But back on topic, if you really want to go fast, do a hemi swap and supercharge it.
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Unread 08-17-2010, 10:01 PM   #4
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Quote:
Originally Posted by KPJ View Post
From all I have read you have two options, maybe three to get real, measurable HP and torque gains. Swap, supercharge programmer.

Swap to a Hemi - there are several outfits/shops which do this. AEV, Burnside (?) Offroad and Jeep Speed Shop are three I've read of, I have an AEV built Jeep on the way.
Instal a RIPP supercharger kit
Instal a Hesco supercharger kit

Also, Jeep Speed Shop does Chevy engine swaps I hear, but I'm not sure if they have the computer bugs worked out yet.

For less gain, you can try Superchips or one of the other programers.

There isn't much in the way of aftermarket HP/torque gear available for the 3.8.

I'm sure others will chime in with other possible options.

JPK
I do make a lot of money, about 40k a year, but I don't think that doing an engine swap is very economical. I want to spend maybe $500 bucks tops. I've heard that some guys were squeezing 400hp out of older 4cly Jeeps but that could just be a rumor. I did spend a small fortune on this Jeep, over 16k and it has only 33k miles and the condition is almost new.

I also heard that a hemi is bad for gas mileage. I like my engine now and I want it to get the same good gas mileage if not better. I get almost 16 miles per gallon. Not bad at all.
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Unread 08-17-2010, 10:03 PM   #5
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Unread 08-17-2010, 10:05 PM   #6
JeepMaster
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Quote:
Originally Posted by robd2003 View Post
Buy a grand cherokee srt8 and dont waste time on going fast in a wrangler. Save us all by driving within speed limits.

Ive see lots of very very mangled vehicles, and cant even start to think about how if at all anyone survived.

But back on topic, if you really want to go fast, do a hemi swap and supercharge it.
Cherokees are nice but you can't go convertible style like you can in a Jeep.

Plus, I hear those stra8 ones get only 6 to 8 miles per gallon.
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Unread 08-17-2010, 10:07 PM   #7
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Quote:
Originally Posted by JeepMaster View Post
I do make a lot of money, about 40k a year, but I don't think that doing an engine swap is very economical. I want to spend maybe $500 bucks tops. I've heard that some guys were squeezing 400hp out of older 4cly Jeeps but that could just be a rumor. I did spend a small fortune on this Jeep, over 16k and it has only 33k miles and the condition is almost new.

I also heard that a hemi is bad for gas mileage. I like my engine now and I want it to get the same good gas mileage if not better. I get almost 16 miles per gallon. Not bad at all.
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Unread 08-17-2010, 10:07 PM   #8
KPJ
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The hemi swaps run from about $12k to a multiple or that, so it seems they are out of the question.

The supercharger option is about $5k from what I have read. That also sounds like it is out of the range you are looking to spend.

That leaves the Superchips or other programmers, which I don't know much about, but they can provide additional power while requiring a switch to higher grades of fuel. Choices for 89 ovtane and 91 as well I read. Also, and importantly, you would have the chance to change shift points and eliminate some O/D/gear hunting if your Jeep is an auto.

Hope this helps,

JPK
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Unread 08-17-2010, 10:08 PM   #9
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Quote:
Originally Posted by JeepMaster View Post
I do make a lot of money, about 40k a year, but I don't think that doing an engine swap is very economical. I want to spend maybe $500 bucks tops. I've heard that some guys were squeezing 400hp out of older 4cly Jeeps but that could just be a rumor. I did spend a small fortune on this Jeep, over 16k and it has only 33k miles and the condition is almost new.

I also heard that a hemi is bad for gas mileage. I like my engine now and I want it to get the same good gas mileage if not better. I get almost 16 miles per gallon. Not bad at all.
Ain't happening man, plain and simple.
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Unread 08-17-2010, 10:09 PM   #10
robd2003
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I own the 4.7HO WJ and ive added a programmer to it, puts it close to 300hp and 375tq
custom exhaust work
factory intake
4" of lift and 32" tires i thought the programmer made a difference but i dont see it doing a full 100HP difference at all.. if your only looking to spend $500 to get some extra power, id really look into programmer/exhaust/intake
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Unread 08-17-2010, 10:09 PM   #11
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Yeah, I want 300hp for $500 too.
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Unread 08-17-2010, 10:11 PM   #12
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Quote:
Originally Posted by KPJ View Post
The hemi swaps run from about $12k to a multiple or that, so it seems they are out of the question.

The supercharger option is about $5k from what I have read. That also sounds like it is out of the range you are looking to spend.

That leaves the Superchips or other programmers, which I don't know much about, but they can provide additional power while requiring a switch to higher grades of fuel. Choices for 89 ovtane and 91 as well I read. Also, and importantly, you would have the chance to change shift points and eliminate some O/D/gear hunting if your Jeep is an auto.

Hope this helps,

JPK
Premium fuel isnt going to work because I deliver pizzas for a living. Gas is already expensive at $2.70 a gallon here for regular.
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Unread 08-17-2010, 10:11 PM   #13
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I do make a lot of money, about 40k a year, ..........

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Unread 08-17-2010, 10:13 PM   #14
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Answer me this.... do you have the 4-speed auto? If so, spend $1200 and get 5.13 gears. You will be surprised at the difference and you will be geared better.
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Unread 08-17-2010, 10:13 PM   #15
JeepMaster
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Quote:
Originally Posted by robd2003 View Post
I own the 4.7HO WJ and ive added a programmer to it, puts it close to 300hp and 375tq
custom exhaust work
factory intake
4" of lift and 32" tires i thought the programmer made a difference but i dont see it doing a full 100HP difference at all.. if your only looking to spend $500 to get some extra power, id really look into programmer/exhaust/intake
Well I guess I could spend a little more after all I make pretty good bank. How much is a good exhaust for a JK and what brand is the best? Will I get better gas mileage?
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