gas mileage enhancer
CHEVY HIGH PERFORMANCE
Reprinted from September 2005. 55 Bolt-On HP For Gen-III 5.3L
PULL HARD
Adding 55 Horses with Granatelli Motor Sports Performance Parts
Text and Photos by Bob Mehlhoff
Pop the hood of a late-model full-size Chevy pickup equipped with a Gen III V-I, and you’ll find the perfect starting point to build lots more power. In stock form, the 5.3L Gen III features aluminum 18-degree cylinder heads combined with a lightweight valvetrain. Up top, a thermoplastic composite intake manifold keeps the air charge cool, and the equal-length intake runners provide smooth port transitions to optimize airflow to each cylinder. Granted, all of this adds up to good performance, but for the guys that demand stronger pulling power and hard acceleration, there is plenty more to set free.
WIRED FOR POWER gas mileage enhancer
Baseline + Test 1
15.3 hp improvement at 5,250 rpm
17.3 lb-ft of torque improvement at 4,250 rpm
These Granatelli plug wires gain an advantage over stock, because they are manufactured with a solid stainless inner connector cable crapped with special fiberglass that emits no noticeable radio interference.
Because the Gen III ignition incorporates a coil-near-plug system, each wire measures about 8 inches from the coil to the spark plug. We wanted to learn why simply replacing the plug wires would yield this kind of power improvement and took an ohm reading on both sets of wires. All the AC Delco wires measured more than 950 ohms of resistance; the Granatelli wires measured less than-1-ohm (0.50 actual reading) of resistance. Remember too, that the Gen III wires are only 8-inches long. If they were as long as a typical small-block Chevy’s, the original AC Delco wires would have resistance considerably higher than 950 ohms, because of the longer current path. gas mileage enhancer
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"Great Product. Installed on my 03 Cobra. Added about 30rwhp & about 40flbs of torque(556hp/608torque). What's best is I improved my gas milage on the road from about 19mpg to 22.5mpg!
Thanks again for a great product,"
Dixon Hall, Modern Mustangs of Jacksonville, Florida