|Having come from a background of CJ’s, TJ’s and XJ’s that all came with nice torquey 258 or 4.0L I-6 engines, it was hard for me to get used to the lathargic 3.8L V6 that the JK’s come with. Granted, my previous Jeeps may not have been speed demons but, at least would get up and go as soon as you hit the gas. More than the motor, the problem with lag that the JK’s have comes from the fact that they now come with an ETC or electric Throttle Control. And, while there are solutions available that can help address this lag by allowing you to reprogram your computer, there is another solution that does a great job of helping out as well - Sprint Booster.The Sprint Booster is a small device that attaches to the the wiring harness on your accelerator pedal and rather than modifying the programming in your JK’s computer, it simply changes the signal being sent from your accelerator. While this device will NOT give you more horse power, it will get your engine going as soon as you give it gas and without delay. The best part is, this device also comes with a remote toggle switch that allows you to change from a high performance mode (RED), to a standard mode (GREEN) and, if you so desire, turn it off altogether.
At about $300, the Sprint Booster isn’t cheap but, I liked the one I got for my Orange JK with an auto that I broke down and got another for my White one with a 6-speed too. Below is a write-up I did that shows just how easy it is to install one in your JK.