When it comes to optimizing the performance of your Duramax diesel engine, few upgrades spark as much conversation as the EGR delete. If you’re serious about maximizing horsepower, lowering exhaust gas temperatures, and keeping your engine running smoothly, an EGR delete might be on your radar. But what exactly is an EGR delete, and how does it impact your truck’s overall performance? In this guide, we’ll break down everything you need to know about EGR deletes, why they’re so popular among diesel enthusiasts, and most importantly, how to approach this upgrade the right way. From understanding the key components to investing in quality parts, we’ve got you covered.
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What You’ll Need for an EGR Delete on Your Duramax
- Upgraded Up Pipe
The first thing you’ll need is an upgraded up pipe, often referred to as the LB7 up pipe. This pipe has a small leg that bypasses the EGR cooler and sends the exhaust directly to the turbo. - Cold Side Intake Tube
You’ll also need a 3-inch cold side intake tube, which connects to an upgraded Y-bridge. - Y-Bridge
An upgraded Y-bridge is essential for improving airflow after the EGR delete. - Heater Hose and Clamps
Finally, you’ll need a ½-inch heater hose and two clamps to bypass the EGR cooler, which will no longer be necessary after the delete.
What is the EGR System and What Does It Do?
EGR stands for Exhaust Gas Recirculation. It’s a system found on almost every vehicle, except for certain models like the first-generation Duramax (LB7). The EGR system introduces exhaust gases back into the intake manifold, where they are burned a second time before exiting through the exhaust as cleaner emissions. This is designed to reduce pollutants and protect the environment.
So, What Does an EGR Delete Do?
The EGR delete essentially stops the recirculation of exhaust gases back into the engine. Once the exhaust is burned, it’s sent straight out of the system, which helps reduce the load on the engine. This also prevents carbon build-up in the engine, improving overall performance. One thing to note is that EGR deletes are illegal in all 50 states and should only be used for off-road purposes. However, it’s your vehicle, and ultimately, it’s up to you.
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The EGR Delete Kit: What’s Inside?
Now let’s talk about the EGR system parts you’ll be dealing with and how they work together. The EGR cooler cools the exhaust gases before they’re recirculated into the engine. You also have the EGR valve, which regulates the air being reintroduced. Over time, the EGR valve gets clogged with soot and grime, reducing airflow and negatively affecting performance.
I have some parts of the EGR system here to show you what it looks like. First, the Y-bridge sits in the valley of your engine and connects to the intake. It can get clogged with nasty build-up over time. In my case, after 150,000 miles, I had about a quarter of an inch of thick build-up in the Y-bridge. This gunk re-enters your engine and can cause all kinds of problems.
Why Should You Consider an EGR Delete?
When you perform an EGR delete, all that soot and carbon build-up will be eliminated. Instead of reintroducing exhaust gases back into your intake system, they’re expelled right out through the exhaust. This not only prevents internal engine contamination but also improves overall engine efficiency.
Once you block off the EGR system using a blocker plate, the exhaust gases no longer pass through the cooler or valve. However, be aware that installing a blocker plate will trigger a check engine light. To get rid of this, you’ll need to install a high-flow cold-side charge pipe and possibly consider tuning your engine with EFI Live or another custom tuning option. The tuning will help trick your engine’s computer into thinking the EGR system is still functioning properly.
Don’t Skimp on Quality!
Don’t buy the EGR delete kits without considering quality. The kits you might find on aftermarket for $98–$150 aren’t worth it. Sure, they might save you a few bucks, but they’re prone to causing problems like cracked up pipes, exhaust leaks, and boost leaks over time. You’ll end up spending more money fixing these issues than you would if you invested in a higher-quality kit in the first place.
I’ve seen a lot of people make this mistake, and trust me, it’s not worth the headache. Once you block off the EGR cooler and install the up pipe, you’ll be adding extra pressure to the system. Cheap kits won’t be able to handle this pressure for long, and you’ll eventually end up with cracked bellows or leaks.
Your Best Option: Upgraded Y-Bridge and High-Flow Charge Pipe
If you’re going to do an EGR delete, do it right. The best approach is to upgrade to a high-quality Y-bridge, which allows for better airflow. The upgraded Y-bridge is a bulletproof solution that improves engine breathing and reduces the chances of boost leaks. Paired with a high-flow charge pipe, you’ll see improvements in exhaust gas temperatures (EGTs) and turbo spool-up times, though the difference won’t be extreme.
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Conclusion
An EGR delete can be a great upgrade for your Duramax, but only if you do it right. Invest in quality parts, such as an upgraded Y-bridge and charge pipe, to prevent issues down the road. While it’s not the cheapest option, it’s the best way to protect your investment and ensure your truck performs at its best.
