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Unread 09-04-2009, 10:14 AM   #1
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2005 WK 
Join Date: Nov 2008
Location: Quad Cities IA/IL
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More Power!

Long story short, I should have bought a WK with at least a 4.7. My wife had other plans...
What can I do to increase the power of my 3.7? Anybody have any experience doing this? Is there a tuner for the 3.7? Are there options that will increase HP, but not kill MPG? I'm beginning my research here, so any ideas would be helpful. Thanks!

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Unread 09-04-2009, 01:37 PM   #2
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2007 JK Wrangler 
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I'm not terribly familiar with the 3.7, but you are unlikely to have a lot of success with that search. Maybe do a K&N air filter and call it a day.
07 JKU - 6spd - LSD rear
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Unread 09-04-2009, 01:53 PM   #3
This post/info=my opinion
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2004 LJ Wrangler 
Join Date: Dec 2005
Location: Colorado
Posts: 23,305
before you buy a CAI or K&N, you want to read this.
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Unread 09-04-2009, 09:42 PM   #4
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2003 TJ Wrangler 
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Location: Trinidad, Colorado
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Power can be made from any engine... it just depends on two things:

1. How much money are you willing to spend.
2. How deep are you willing to dig into the engine.
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Unread 09-14-2009, 08:37 AM   #5
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2005 WK 
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Eh, I've heard too much back and forth on CAI and K&N. I know large gains can be had in the power of any motor. I know that large gains will cost you a lot of money. I'm looking for smaller gains. The right spark plugs, exhaust, better than stock air filter, etc. Are these going to do anything for me? Until somebody comes out with a programmer for the 3.7, I'm pretty limited. If I were going to dump a bunch of money into it, I'd just drop in a new motor. I'm just looking to make due with what I have and hopefully gain a few HP.
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Unread 09-14-2009, 11:44 AM   #6
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1999 TJ Wrangler 
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What gearing and Transmission do you have? I had an 05 Liberty with the 3.7 and 6 spd and it had lots of power. It ran about 2900 rpms on the highway and sucked gas almost as bad as my TJ though.
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Unread 09-14-2009, 08:51 PM   #7
Reelm n Rubi
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2003 TJ Wrangler 
Join Date: Jun 2005
Location: willamette valley oregon
Posts: 891
Nothing is free! You get power by putting more air through the engine, therefore (if you keep your air fuel ratio correct) using more fuel. If you want more power, prepare to spend more on gas.
2003 Lt. Khaki Rubicon automatic
Supercharged 4.7 stroker w/ Hesco aluminum head
70mm F&B throttle body
Kieth Black forged 944 pistons
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JKS 1" MM,BL. TeraFlex engine and steering armor
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