If you've spent any time behind the wheel of an old Ford truck, you know that adding an ats turbo 7.3 idi setup is basically the holy grail for these engines. Before the Powerstroke took over the diesel world in the mid-90s, the 7.3 International Harvester IDI was the king of the road, albeit a very slow, very loud king. It's an engine legendary for its durability and "run on anything" attitude, but let's be honest—in its stock, naturally aspirated form, it couldn't pull a greasy string out of a cat's ear when you hit a steep grade.
That's where the ATS kit comes into play. It's the single most significant upgrade you can do to an old IDI. It transforms a sluggish workhorse that struggles to merge onto the highway into a legitimate towing machine that can actually keep up with modern traffic.
The History Behind the Kit
It's pretty cool to think about how the ats turbo 7.3 idi connection even started. Back in the early 90s, Ford realized they were falling behind in the horsepower wars. Dodge had the Cummins with a turbo, and GM had their own turbocharged options. Ford's 7.3 IDI was reliable, but it was "naturally aspirated," which is just a fancy way of saying it breathed air at atmospheric pressure.
Instead of designing a whole new system from scratch for the 1993 and 1994 model years, Ford actually went to ATS (Advanced Turbo Systems) and asked them to supply the hardware. If you find a "factory turbo" IDI truck today, you're basically looking at an ATS system with a Ford logo stamped on it. This gives the ATS kit a lot of street cred. It wasn't just some random aftermarket bolt-on; it was the blueprint for the OEM setup.
Why You Actually Need a Turbo
Driving a non-turbo 7.3 IDI is a lesson in patience. You learn to look far ahead, you learn to keep your momentum, and you definitely learn to ignore the line of angry cars behind you as you crawl up a mountain pass at 35 mph. The engine has plenty of displacement, but it just can't get enough air to burn the fuel it needs for real power.
When you bolt on an ats turbo 7.3 idi system, you're finally letting that engine breathe. The turbo uses the exhaust energy—which would otherwise just be wasted heat—to pump compressed air into the intake. More air means you can add more fuel. More fuel and air means more bang.
In real-world terms, you're looking at a jump from maybe 180 horsepower to somewhere in the 240-260 range, depending on how you tune it. But the real story is the torque. That's what moves trailers, and that's what you feel in your seat when you step on the gas.
The Famous ATS 093 vs. the 088
If you start scouring forums or Facebook groups for an ats turbo 7.3 idi kit, you'll hear people talking about the "088" and the "093."
The 088 was the earlier style. It's a non-wastegated turbo, which means it's a bit simpler but can be a little slower to "spool up" (get moving) at low RPMs. It's a solid, heavy-duty unit, but most guys hunt for the 093.
The 093 is the wastegated version, and it's the one Ford ended up using for the factory trucks. The wastegate allows the turbo to build boost much faster at low speeds without over-pressurizing the engine at high speeds. It makes the truck feel much more responsive around town. If you're towing, that low-end grunt is exactly what you want.
The Installation Realities
I'm not going to lie to you—installing an ats turbo 7.3 idi kit isn't exactly a walk in the park, but it's definitely doable in a driveway if you've got some decent tools and a buddy to help.
The biggest headache is the space. The 7.3 IDI sits pretty far back in the engine bay of those old F-250s and F-350s. Getting the "up-pipes" (the pipes that take exhaust to the turbo) and the "downpipe" (the pipe that takes exhaust away) to fit can be a tight squeeze.
You'll often hear IDI owners talk about the "firewall massage." This is a polite way of saying you're going to have to take a large hammer to the sheet metal behind the engine to make room for the 3-inch downpipe. It's a bit nerve-wracking to beat on your truck with a sledgehammer, but it's the only way to get that exhaust flowing properly. If you keep the tiny, crushed factory downpipe that Ford used, you're leaving a lot of power on the table.
Tuning the Pump
Adding the turbo is only half the battle. If you just bolt on the ats turbo 7.3 idi kit and call it a day, you'll notice a little difference, but not the "holy cow" moment you're looking for. You have to give it more fuel.
The 7.3 IDI uses a mechanical DB2 injection pump. There are no computers here, no "chips" to plug in, and no remapping software. You literally have to pull a small plug on the side of the pump and turn an internal screw with an Allen wrench. Most guys go "two flats" (two turns of the flat sides of the screw) to start. This increases the fuel delivery to match the new air the turbo is providing.
Just a heads up: once you do this, you absolutely need an EGT (Exhaust Gas Temperature) gauge. Since there's no computer to tell the engine to stop if things get too hot, you have to be the computer. If those temps get too high while you're lugging a trailer up a hill, you can melt pistons. But as long as you keep an eye on that gauge, these engines are nearly bulletproof.
Maintenance and Long-Term Reliability
One of the best things about the ats turbo 7.3 idi setup is that it doesn't really hurt the longevity of the engine if you're smart about it. These engines have high compression (around 21.5:1), which is great for starting in the cold but means they don't like massive amounts of boost.
Most people keep their ATS setups around 10 to 12 psi of boost. Could you push it to 15 or 20? Maybe, but then you're asking for head gasket issues. At 10 psi, the engine is happy, the air is cool enough without needing a massive intercooler, and you'll still get hundreds of thousands of miles out of it.
You'll want to stay on top of your oil changes even more strictly once you're turbocharged. The turbo relies on the engine's oil for lubrication and cooling, and it spins at incredibly high speeds. Clean oil is the lifeblood of that bearings system.
Finding a Kit Today
Since these trucks are getting older, finding a brand-new ats turbo 7.3 idi kit can be a challenge. ATS doesn't keep them in stock like they used to, but the used market is alive and well.
You can often find them at junkyards on old "OBS" (Old Body Style) Fords, but you have to be careful. Check the turbo for "shaft play"—if the wheel inside wiggles back and forth or hits the housing, it needs a rebuild. Luckily, rebuilding these turbos is relatively cheap and something a specialized shop can do easily.
There are also companies today like Classic Diesel Designs or R&D IDI Performance that specialize in these old engines. They often sell parts, upgrades, and even complete turbo systems that are based on or improved from the original ATS designs.
Is It Worth It?
If you love your old Ford and don't want to spend $80,000 on a new truck that has more computers than a NASA laboratory, then yes, it's worth it. An ats turbo 7.3 idi setup gives you a truck that can actually do work. It sounds amazing—that signature whistle is unmistakable—and it makes the driving experience so much less stressful.
You're not going to win any drag races against a modern 6.7 Powerstroke, but you'll have a reliable, mechanical beast that you can actually fix yourself in the driveway. There's something really satisfying about that. Plus, there's nothing quite like the sound of an IDI under boost. It's a pure, mechanical grunt that just says, "I can do this all day."