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You’ve heard before that a gas engine is basically a giant air pump. Traditional hot rodding suggests that more air in and more air out equals more power. But would this hold true for a modern engine like the 4.7L High Output V-8 in our WJ Grand Cherokee? The H.O. engine uses a forged crank, increased compression, a different camshaft, larger injectors, and a unique intake manifold to make 30 hp more than the standard 4.7L engine. Did the Mopar engineers leave anything on the table in terms of power or mileage? We wanted to find out.
The full-time NP247 transfer case in our Grand results in a lot of spinning parts and stock mileage around 19 mpg. We decided to toss on an intake, programmer, and exhaust to find out if any gains were to be had. But before we could get started, Editor-in-Chief Péwé stopped us cold. “How will you know which parts made a difference if you add them all at the same time?” he sagely asked. To provide the most value to the readers, each part needed to be tested independently and then the system evaluated as a whole.
We rounded up parts from Airaid, Superchips, and DynoMax and installed them one at a time, then documented the mileage on a designated route and documented the power on the AWD Dynojet at Street to Sand Off-Road & Performance. Over a dozen pulls were made to test various parts configurations, and the results surprised and sometimes disappointed us. There were very little gains to be had in terms of mileage regardless of what we did, but every part we tested added horsepower and torque throughout the powerband.
Airaid IntakeIntake bonus:Never have to buy another filter again The factory intake on our 4.7L engine uses a paper filter that passed air through a corrugated hose into a resonator in front of the throttle body. It does a reasonably good job of keeping the engine quiet without choking the engine, but there was still room for improvement. We added an Airaid intake (PN 311-148) that includes a high-flow air filter with greater surface area than stock, along with a smooth intake tube that runs straight to the throttle body. It sits in the lower half of the factory intake box with an included heat shield to keep hot underhood air from entering the engine. We specified a SynthMax filter that never needs to be oiled and added a prefilter from Airaid as well since our Jeep sees a lot of dusty roads. The Airaid intake made the biggest increase in horsepower of any of the parts we installed.
Superchips FlashpaqFlashpaq bonus:Read and clear diagnostic trouble codes The days of rejetting carbs are gone. With modern onboard diagnostics it is possible to add power without even getting your hands dirty. Superchips offers performance, towing, and economy options in its Flashpaq tuner (PN 3870). These tunes cannot be changed on the fly, so we store the Superchips programmer in the glovebox and plug it into the OBD-II port when we want to use the tow tune. The Flashpaq also provides the ability to read and clear diagnostic trouble codes, raise the rev limiter and speed limiter, and account for the larger tires that we intend to add soon.
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