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Tsquare wrote:
We tried the two most popular intake system and a "stock-mod" air intake. The K&N and Air Raid were better than stock but a modified stock aibox with the baffle removed and a 80mm feed hose from the airbox to the fender did better than the aftermarket kits.
Because it acted like a ram air kit, not just an open air filter element sucking up heat soak... Also the literal ramming of air into a funnel of sorts will compress the air more so Same as what a snorkel claims it does and why they allegedly increase MPG and equally get a little bump in the HP dept..
I dont think its anything too impressive but an extra 1.-3 MPG is good for at least 25-32 MPT
The differences after that will be the filtration; as Paper, Cotton, or even Foam type filters.
That may be stretching it but there might have been. The truck was on a dyno in a climate controlled room with a couple of fans pointed at the front of the truck. I not sure there was much of a ram air action but the air going into the airbox was coming from outside the engine compartment. My tuner tried the various intakes but also tried a couple of different cat-back exhaust to get the combination that worked best together.
The addition of one component usually had little effect. The combination of a freer flowing intake, freer flowing exhaust, electric fans, electric water pump, under-drive pulley, and tune chip allowed more torque to the rear tires. In real world driving the truck went from 13.5 mpg to 15-15.5mpg in city driving and 16ish mpg hwy to 20mpg with a noticeable difference in my seat of the pants dynometer.
____________________
Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement