Join Date: Aug 2007
Location: Lakemoor, IL (northwest Chicago burbs)
Feedback: 0 reviews
This engine really does better with a few more RPMs. My brother-in-law was driving his 2 door rubicon like it had the old 4.0L I-6 engine, shifting at low rpms. I get mine up past 3000 rpm pretty regularly. He coudln't believe how much better mine handled when he rode with me even though it is a heavier 4dr with a lift, bumpers, and winch. We both have the same tires and gears, but my shift point was higher.
Also, you only get better mileage from low rpms if you aren't having to mash the gas to maintain speed. You'd do a lot better running 1/4 throttle at 2500 rpm vs wide open at 2000 rpm.
Keep in mind, peak torque is at 4000 rpm and peak horsepower is at 5000. Don't run it up there all the time, but the tach goes up there for a reason.
2007 JK Rubicon Unlimited Rescue Green 6 Speed
Mods Shrockworks Rails & Bumpers, Currie Lift, Tom Woods 1350 driveshafts, 35" Toyo M/Ts on ProComp 7028s