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Calibrated Power Blog

The latest Duramax, Cummins, and Power Stroke diesel news and resources from Calibrated Power.

TurboStealthHigh EGT'sLML TurboTurbo UpgradesStealth VVTStealth 67G2L5PVGTL5DNozzle RingHigh Flow VanesTurbo VanesHFV

High Flow Vanes (HFVs) For Variable Geometry Turbos and Why You Need Them

TurboLB7 TurboLBZ TurboLML TurboDiesel Turbo Options DuramaxDuramax TurboLLY TurboVGTVVT

How VVT/VGT Turbochargers Work on Your Diesel

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Diesel Tuner's Blog

High Flow Vanes (HFVs) For Variable Geometry Turbos and Why You Need Them

[fa icon="calendar'] Dec 3, 2022 10:19:00 AM / by Ben Lawson posted in Turbo, Stealth, High EGT's, LML Turbo, Turbo Upgrades, Stealth VVT, Stealth 67G2, L5P, VGT, L5D, Nozzle Ring, High Flow Vanes, Turbo Vanes, HFV

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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.

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How VVT/VGT Turbochargers Work on Your Diesel

[fa icon="calendar'] Jul 24, 2021 9:30:00 AM / by Paul Wilson posted in Turbo, LB7 Turbo, LBZ Turbo, LML Turbo, Diesel Turbo Options Duramax, Duramax Turbo, LLY Turbo, VGT, VVT

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Turbocharging diesel engines is nothing new. The most basic premise of a diesel engine is the more fuel and air you mix during compression, the more power you get.

Types of turbocharger systems:

Wastegate Turbocharger
Fixed Vane Turbocharger
VVT/VGT Turbocharger
Compound Turbocharger
Twin Turbocharger
Dual Scroll Turbocharger

Between 1885 and 1916 a few patent applications were submitted for products that address the general concept of turbocharging, but it was in 1925 that Swiss Engineer Alfred Buchi put the first commercially available turbo on a 10 cylinder diesel engine. Turbochargers use exhaust gas pressure to drive a Turbine Wheel that is connected to a Compressor Wheel. The compressor wheel forces cold air into your engine. You're using exhaust pressure to create boost pressure.

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