![]() The stock exhaust is especially restrictive on an OBS 7.3 Ford as it measures in at only three and a half inches from the transmission to the tail pipe, but that’s not the worst part. Grouped together I considered these “Stage One,” and the name of the game is airflow in and out. But the question is: where do I start? Walk Before You Run: Stage Oneīecause the HEUI injection system is controlled by a computer, there is some extra power which can be unlocked with just a few simple mods. When it comes to building a high-performance truck, the best part of the HEUI Fords is the fact they weren’t equipped with a DPF, so it’s open season on the upgrades. While that may not get you down the racetrack in a hurry, the 7.3 can tow like a champ, gets great fuel mileage for its size, and is one of the more reliable diesel powerplants Ford has used. The 7.3 Powerstroke is a two-valve behemoth which measures in at 444 cubic inches and has a maximum stock power rating of 275hp and 525lb.ft. Based on the surface areas of the oil and fuel side of the plunger, there is a multiplication effect of 7:1, which means 3,000psi of oil will create 21,000psi of fuel entering the engine. ![]() ![]() The acronym HEUI stands for Hydraulic Electronic Unit Injector, and it’s a system where engine oil is pressurized to about 3,000psi, and that oil is used to push down on a plunger which in turn forces fuel into the engine. 2016 - 2022 Canyon/Colorado 2.8L Duramaxįrom 1994 to 2003 Ford used a diesel engine sourced from Navistar International which employed a unique method to get the fuel into the combustion chamber, and they did it without using a traditional injection pump: instead, they used oil.
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