JP Magazine publishes some of the best Jeep tech articles in the industry. Since the JK Wrangler is not known for being a powerhouse and many owners have saddled what mediocre power their 3.8-liter V6 can muster with an automatic transmission, big tires, improper gearing, and lots of heavy bolt-on accessories, Christian Hazel's article covering bolt-on performance accessories is appreciated.
You should really read the article for yourself, but here is a rundown of the 7 steps they took to revive their trusty JK's performance:
1) Baseline measurement
2) Oil Change, Fresh Air Filter, Clean Crankcase
3) Cold Air Intake
4) Performance Exhaust
5) Throttle Body Spacer
6) Headers & Ignition
7) Engine Tuner
Their initial measurement, a 1-mile uphill acceleration, resulted in a trap speed of 59mph. After all these mods were performed, their 1-mile uphill trap speed increased to 68mph. On top of that, they measured a gain in fuel economy from 16.1mpg to 17.6mpg.
Of course, if performance is of importance to you, a manual transmission is a much better option than an automatic. If you've lifted your Jeep to fit bigger tires, your biggest performance boost will come from a deeper set of ring & pinion gears. The following gear ratio charts can help you pick the appropriate ratio to extract the most from your Jeep:
|Click to zoom in|