One of the biggest advancements in turbo design since we first started applying them to diesel engines over 70 years ago has been the invention of Variable Geometry Turbos. These turbos utilize a set of movable vanes on the inside of the exhaust housing that allows the actuator to vary the area in which exhaust gasses can pass through them. This allows the exhaust side of the turbo to increase or restrict the flow of exhaust hitting the turbine wheel. In some designs it also changes the flow direction of gasses hitting the exhaust turbine as you can see illustrated below.
When restricted, the velocity of the exhaust gasses increases which helps spin the turbine faster than a fixed geometry turbo would. This gives the turbo the ability to spool the turbine and compressor wheel up much better than it normally would even with a low volume of exhaust pressure traveling through the system. This helps to spool the turbo at lower RPMs to create boost where it would normally be lacking. This is why variable geometry turbos (VGTs) are such an advancement. They have the ability to significantly reduce turbo lag and provide much better response and turbo efficiency across a range of RPMs.
Stealth 64? Stealth 64G2? Stealth 67G2?
You finally got the okay from the wife on spending that tax return, you're thinking about upgrading the turbo on your 2001-2004 LB7. Like any well educated Duramax owner you go to DuramaxTuner.com to check out everything you can on the Stealth turbo, but you're still wondering which is right for you.
Now you may have the urge to simply pick the turbo with the highest peak power. Maybe your thought process is to go immediately at the cheapest price. To be honest, no matter which way you go, each Stealth turbo is going to be better than the stock charger. However, there are a few things we would recommend you consider before making your buying decision. It can help you save money and time in the long run, so let's dive into which suits you best.
There are a few things to consider before picking a new turbo for your LB7:
Single, Drop-In, 800 HP, LB7 Turbo:
When you're looking for the ultimate Duramax turbo, everything really depends on what caters to your wants and needs for your truck. This turbo was created with diesel enthusiasts such as ourselves in mind. We asked what everyone wanted in a larger turbo and the Stealth 67 G2 is what we came back with. This new addition to the Stealth line is superb and fits in the family of our in-house designed, industry leading turbos. Let's delve into what this beast can accomplish.
The Stealth 67G2:
- Quick spool up
- Big power
- Great daily driver
- Models available for 2001-2016 Duramax (LB7, VVT, LML)