Originally Posted by theoblunt
I want to increase power and fuel economy. Does anyone have experience with engine management computers (superchip, powercomander, ect). Which one do you use? Is the power increase noticeable without additional mods (intake, exhaust)? Have you seen any improvement in MPGs?
I see you have an 2006 4.0L TJ. Chips/tuners are pretty much useless on the 4.0L.
If you want to improve fuel economy then you need to change your driving habits or find alternate means of transportation.
If you want to improve power, then you're looking at a cam & head work, stroker kit, turbo or supercharger. Those may actually worsen fuel economy...unless you can drive like a grandma and keep your foot out of the skinny pedal.
If you have larger than stock tires and want to regain the "power" you've lost, then you need to regear both front and rear axles, and recalibrate the speedometer.