Banks 4.0L Sidewinder Turbo system

Waking Up the 4.0L Six

Christian LeePhotographer, WriterThe ManufacturerPhotographer

We've spent countless hours driving 4.0L-equipped Jeeps, chiefly in Wrangler TJs, Cherokee XJs, and a Grand Cherokee WJ. They've all been great vehicles with one thing in common—a somewhat anemic engine that waned whenever you needed additional horsepower and torque the most. Weighing the popularity of the 4.0L-equipped Wrangler TJ, the team at Banks Power decided to address this issue head-on with the introduction of its 4.0L Sidewinder Turbo system.

The goal of the Banks Power 4.0L Sidewinder Turbo system was to improve low- and mid-range torque for increased power on the trail and improved drivability on the pavement. Banks accomplished this goal. The Turbo delivers nearly 50 percent more horsepower than stock and just over 50 percent more torque. In fact, torque output with the turbo at 1,600 rpm is greater than the peak torque in stock condition. This aggressive torque profile is ideal for rock-crawling and trail-running scenarios.

We spent a few days at the Banks Power engineering facility in Azusa, California, to familiarize ourselves with the 4.0L Sidewinder Turbo system. It's a high-end system that will not disappoint. With huge horsepower and torque increases, it effectively transitions the venerable-but-lacking 4.0L engine into V-8 or diesel territory. Check out the photos and captions for all the details.